/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 DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:37:46,725 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:37:46,729 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:37:46,753 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:37:46,754 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:37:46,756 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:37:46,759 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:37:46,772 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:37:46,777 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:37:46,780 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:37:46,781 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:37:46,783 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:37:46,783 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:37:46,784 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:37:46,786 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:37:46,787 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:37:46,788 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:37:46,789 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:37:46,791 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:37:46,794 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:37:46,796 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:37:46,797 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:37:46,799 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:37:46,800 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:37:46,803 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:37:46,814 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:37:46,815 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:37:46,816 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:37:46,817 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:37:46,835 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:37:46,835 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:37:46,837 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:37:46,838 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:37:46,838 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:37:46,838 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:37:46,838 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:37:46,839 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:37:46,839 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:37:46,839 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:37:46,839 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:37:46,840 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:37:46,841 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:37:46,841 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:37:46,841 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:37:46,841 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:37:46,842 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:37:46,842 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:37:46,842 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:37:46,842 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:37:46,842 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:37:46,843 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:46,843 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:37:46,843 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:37:46,843 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 -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:37:47,191 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:37:47,210 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:37:47,214 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:37:47,216 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:37:47,217 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:37:47,218 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 19:37:47,310 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7358df3de/26f7c2a1ad6246a7ad9a07d7c79588b0/FLAG89bc28a61 [2020-07-21 19:37:47,920 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:37:47,921 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_5-2.c [2020-07-21 19:37:47,929 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7358df3de/26f7c2a1ad6246a7ad9a07d7c79588b0/FLAG89bc28a61 [2020-07-21 19:37:48,252 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/7358df3de/26f7c2a1ad6246a7ad9a07d7c79588b0 [2020-07-21 19:37:48,268 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:37:48,274 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:37:48,275 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:37:48,276 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:37:48,281 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:37:48,283 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,289 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f318255 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48, skipping insertion in model container [2020-07-21 19:37:48,290 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,303 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:37:48,328 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:37:48,608 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:37:48,615 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:37:48,637 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:37:48,656 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:37:48,656 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48 WrapperNode [2020-07-21 19:37:48,657 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:37:48,658 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:37:48,658 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:37:48,658 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:37:48,672 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,790 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,791 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,799 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,803 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,804 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... [2020-07-21 19:37:48,807 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:37:48,808 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:37:48,808 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:37:48,808 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:37:48,810 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:37:48,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:37:48,896 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:37:48,897 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 19:37:48,897 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 19:37:48,897 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:37:48,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:37:48,897 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:37:48,898 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 19:37:48,898 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 19:37:48,898 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:37:48,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:37:48,899 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:37:49,159 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:37:49,160 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:37:49,166 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:37:49 BoogieIcfgContainer [2020-07-21 19:37:49,166 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:37:49,169 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:37:49,170 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:37:49,176 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:37:49,177 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:37:48" (1/3) ... [2020-07-21 19:37:49,178 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1fe7eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:37:49, skipping insertion in model container [2020-07-21 19:37:49,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:37:48" (2/3) ... [2020-07-21 19:37:49,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2b1fe7eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:37:49, skipping insertion in model container [2020-07-21 19:37:49,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:37:49" (3/3) ... [2020-07-21 19:37:49,183 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_5-2.c [2020-07-21 19:37:49,211 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:37:49,223 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:37:49,251 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:37:49,293 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:37:49,293 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:37:49,294 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:37:49,294 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:37:49,294 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:37:49,294 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:37:49,295 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:37:49,295 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:37:49,326 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 19:37:49,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:37:49,337 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:49,338 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:49,339 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:49,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:49,351 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 19:37:49,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:49,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073324277] [2020-07-21 19:37:49,367 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:49,448 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:37:49,449 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:49,453 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:37:49,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:49,572 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:37:49,572 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:37:49,574 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073324277] [2020-07-21 19:37:49,575 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:37:49,575 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:37:49,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584020839] [2020-07-21 19:37:49,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:37:49,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:49,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:37:49,599 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:37:49,602 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 19:37:49,772 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:49,772 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 19:37:49,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:37:49,776 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:37:49,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:49,789 INFO L225 Difference]: With dead ends: 44 [2020-07-21 19:37:49,790 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:37:49,795 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:37:49,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:37:49,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 19:37:49,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:37:49,861 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:37:49,864 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 19:37:49,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:49,865 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:37:49,865 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:37:49,866 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:37:49,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:37:49,869 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:49,869 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:50,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:50,084 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:50,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:50,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 19:37:50,086 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:50,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763064350] [2020-07-21 19:37:50,087 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:50,128 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:37:50,129 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:50,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:37:50,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:50,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:37:50,173 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:37:50,174 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763064350] [2020-07-21 19:37:50,174 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:37:50,175 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:37:50,175 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359766799] [2020-07-21 19:37:50,177 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:37:50,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:50,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:37:50,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:37:50,179 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 19:37:50,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:50,275 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 19:37:50,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:37:50,277 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:37:50,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:50,279 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:37:50,279 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 19:37:50,281 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:37:50,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 19:37:50,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 19:37:50,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:37:50,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:37:50,294 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 19:37:50,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:50,295 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:37:50,295 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:37:50,295 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:37:50,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:37:50,298 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:50,298 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:50,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:50,515 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:50,516 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:50,516 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 19:37:50,517 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:50,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1267350573] [2020-07-21 19:37:50,518 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:50,552 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:37:50,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:50,554 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:37:50,556 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:50,666 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:37:50,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:50,974 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:50,981 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,045 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:37:51,046 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1267350573] [2020-07-21 19:37:51,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:51,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:37:51,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [403286175] [2020-07-21 19:37:51,048 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:37:51,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:51,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:37:51,053 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:37:51,054 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 19:37:51,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:51,288 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 19:37:51,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:37:51,291 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 19:37:51,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:51,293 INFO L225 Difference]: With dead ends: 41 [2020-07-21 19:37:51,294 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 19:37:51,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:37:51,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 19:37:51,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 19:37:51,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:37:51,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:37:51,335 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 19:37:51,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:51,336 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:37:51,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:37:51,336 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:37:51,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:37:51,340 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:51,340 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:51,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:51,553 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:51,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:51,554 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 19:37:51,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:51,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1537499540] [2020-07-21 19:37:51,556 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:51,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:37:51,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:51,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:37:51,591 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:51,684 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:37:51,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:51,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,909 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:51,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:37:51,982 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1537499540] [2020-07-21 19:37:51,982 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:51,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:37:51,983 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217662465] [2020-07-21 19:37:51,986 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:37:51,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:51,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:37:51,987 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:37:51,989 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 19:37:52,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:52,184 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 19:37:52,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:37:52,185 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 19:37:52,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:52,193 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:37:52,194 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:37:52,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:37:52,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:37:52,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 19:37:52,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:37:52,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:37:52,219 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 19:37:52,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:52,220 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:37:52,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:37:52,223 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:37:52,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:37:52,228 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:52,228 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:52,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:52,430 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:52,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:52,431 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 19:37:52,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:52,432 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [569200973] [2020-07-21 19:37:52,432 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:52,475 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:52,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:52,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:37:52,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:52,552 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:37:52,553 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:52,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,890 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:52,968 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:37:52,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [569200973] [2020-07-21 19:37:52,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:52,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:37:52,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [81070237] [2020-07-21 19:37:52,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:37:52,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:52,972 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:37:52,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:37:52,972 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 19:37:53,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:53,151 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 19:37:53,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:37:53,151 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 19:37:53,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:53,154 INFO L225 Difference]: With dead ends: 51 [2020-07-21 19:37:53,154 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 19:37:53,155 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:37:53,156 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 19:37:53,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 19:37:53,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:37:53,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:37:53,166 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 19:37:53,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:53,167 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:37:53,167 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:37:53,167 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:37:53,169 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 19:37:53,169 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:53,169 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:53,385 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:53,386 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:53,386 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:53,387 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 19:37:53,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:53,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367938720] [2020-07-21 19:37:53,388 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:53,439 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:53,440 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:53,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:37:53,446 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:53,510 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:37:53,510 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:53,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:53,833 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:53,835 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:53,891 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:37:53,892 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367938720] [2020-07-21 19:37:53,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:53,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:37:53,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813246445] [2020-07-21 19:37:53,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:37:53,894 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:53,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:37:53,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:37:53,895 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 19:37:54,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:54,069 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 19:37:54,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:37:54,077 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 19:37:54,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:54,081 INFO L225 Difference]: With dead ends: 56 [2020-07-21 19:37:54,082 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 19:37:54,083 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:37:54,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 19:37:54,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 19:37:54,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:37:54,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:37:54,108 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 19:37:54,109 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:54,109 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:37:54,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:37:54,109 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:37:54,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 19:37:54,115 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:54,119 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:54,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:54,334 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:54,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:54,334 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 19:37:54,335 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:54,335 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920830741] [2020-07-21 19:37:54,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:54,381 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:54,382 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:54,383 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:37:54,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:54,470 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:37:54,471 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:54,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:54,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:54,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:55,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:55,123 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:37:55,123 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920830741] [2020-07-21 19:37:55,124 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:55,124 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:37:55,124 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [375734580] [2020-07-21 19:37:55,125 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:37:55,126 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:55,126 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:37:55,127 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:37:55,127 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 19:37:55,374 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:55,374 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 19:37:55,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:37:55,375 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 19:37:55,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:55,378 INFO L225 Difference]: With dead ends: 61 [2020-07-21 19:37:55,378 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 19:37:55,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:37:55,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 19:37:55,390 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 19:37:55,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:37:55,392 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:37:55,392 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 19:37:55,393 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:55,393 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:37:55,393 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:37:55,393 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:37:55,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 19:37:55,395 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:55,396 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:55,613 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:55,614 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:55,614 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:55,615 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 19:37:55,615 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:55,616 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1499856609] [2020-07-21 19:37:55,616 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:55,697 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:55,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:55,698 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:37:55,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:55,770 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 19:37:55,771 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:56,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,132 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,330 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:37:56,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1499856609] [2020-07-21 19:37:56,331 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:56,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:37:56,332 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1891617098] [2020-07-21 19:37:56,333 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:37:56,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:56,334 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:37:56,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:37:56,335 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 13 states. [2020-07-21 19:37:56,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:56,556 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 19:37:56,556 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:37:56,556 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 54 [2020-07-21 19:37:56,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:56,559 INFO L225 Difference]: With dead ends: 66 [2020-07-21 19:37:56,559 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 19:37:56,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:37:56,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 19:37:56,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 19:37:56,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:37:56,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:37:56,573 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 19:37:56,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:56,573 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:37:56,574 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:37:56,574 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:37:56,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 19:37:56,576 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:56,576 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:56,789 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:56,791 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:56,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:56,792 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 19:37:56,792 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:56,793 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1159048060] [2020-07-21 19:37:56,793 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:56,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:56,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:56,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:37:56,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:56,974 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 19:37:56,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:57,597 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,599 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,973 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 19:37:57,974 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1159048060] [2020-07-21 19:37:57,974 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:57,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:37:57,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723595710] [2020-07-21 19:37:57,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:37:57,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:57,977 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:37:57,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:37:57,978 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 15 states. [2020-07-21 19:37:58,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:58,256 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 19:37:58,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:37:58,256 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 78 [2020-07-21 19:37:58,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:58,259 INFO L225 Difference]: With dead ends: 71 [2020-07-21 19:37:58,259 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 19:37:58,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:37:58,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 19:37:58,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 19:37:58,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:37:58,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 19:37:58,273 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 19:37:58,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:58,274 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 19:37:58,274 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:37:58,274 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 19:37:58,276 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 19:37:58,276 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:58,276 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:58,490 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:58,491 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:58,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:58,492 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 19:37:58,492 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:58,493 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727874587] [2020-07-21 19:37:58,493 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:58,599 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:58,600 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:58,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:37:58,605 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:58,684 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 79 refuted. 0 times theorem prover too weak. 161 trivial. 0 not checked. [2020-07-21 19:37:58,685 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:59,127 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:59,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:59,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:59,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:59,354 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 27 proven. 83 refuted. 0 times theorem prover too weak. 157 trivial. 0 not checked. [2020-07-21 19:37:59,354 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727874587] [2020-07-21 19:37:59,355 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:59,355 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:37:59,356 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947441971] [2020-07-21 19:37:59,356 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:37:59,357 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:59,357 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:37:59,358 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:37:59,358 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 13 states. [2020-07-21 19:37:59,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:59,568 INFO L93 Difference]: Finished difference Result 84 states and 164 transitions. [2020-07-21 19:37:59,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:37:59,569 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 108 [2020-07-21 19:37:59,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:59,572 INFO L225 Difference]: With dead ends: 84 [2020-07-21 19:37:59,572 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 19:37:59,575 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 196 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:37:59,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 19:37:59,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 52. [2020-07-21 19:37:59,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 19:37:59,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 80 transitions. [2020-07-21 19:37:59,610 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 80 transitions. Word has length 108 [2020-07-21 19:37:59,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:59,611 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 80 transitions. [2020-07-21 19:37:59,611 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:37:59,612 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 80 transitions. [2020-07-21 19:37:59,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 19:37:59,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:59,616 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 6, 6, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:59,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:59,832 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:59,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:59,832 INFO L82 PathProgramCache]: Analyzing trace with hash -60364660, now seen corresponding path program 1 times [2020-07-21 19:37:59,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:59,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [319135271] [2020-07-21 19:37:59,833 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:59,904 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:59,905 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:59,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 244 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:37:59,909 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:59,980 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 56 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-21 19:37:59,980 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:00,305 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:00,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:00,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:00,450 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 58 refuted. 0 times theorem prover too weak. 176 trivial. 0 not checked. [2020-07-21 19:38:00,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [319135271] [2020-07-21 19:38:00,451 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:00,451 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 19:38:00,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2001624504] [2020-07-21 19:38:00,452 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:38:00,452 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:00,453 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:38:00,453 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:38:00,453 INFO L87 Difference]: Start difference. First operand 52 states and 80 transitions. Second operand 11 states. [2020-07-21 19:38:00,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:00,599 INFO L93 Difference]: Finished difference Result 79 states and 145 transitions. [2020-07-21 19:38:00,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:38:00,603 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 109 [2020-07-21 19:38:00,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:00,605 INFO L225 Difference]: With dead ends: 79 [2020-07-21 19:38:00,605 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 19:38:00,606 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 202 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:38:00,607 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 19:38:00,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 54. [2020-07-21 19:38:00,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 19:38:00,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 85 transitions. [2020-07-21 19:38:00,618 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 85 transitions. Word has length 109 [2020-07-21 19:38:00,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:00,618 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 85 transitions. [2020-07-21 19:38:00,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:38:00,618 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 85 transitions. [2020-07-21 19:38:00,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 19:38:00,620 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:00,621 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 8, 8, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:00,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:00,827 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:00,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:00,828 INFO L82 PathProgramCache]: Analyzing trace with hash 836558126, now seen corresponding path program 1 times [2020-07-21 19:38:00,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:00,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418567017] [2020-07-21 19:38:00,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:00,935 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:00,935 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:00,937 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:38:00,939 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:01,012 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 103 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-21 19:38:01,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:01,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:01,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:01,810 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:01,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:01,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:01,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:02,000 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:02,056 INFO L134 CoverageAnalysis]: Checked inductivity of 438 backedges. 81 proven. 113 refuted. 0 times theorem prover too weak. 244 trivial. 0 not checked. [2020-07-21 19:38:02,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418567017] [2020-07-21 19:38:02,057 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:02,057 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 19:38:02,057 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [452250604] [2020-07-21 19:38:02,058 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:38:02,058 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:02,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:38:02,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:38:02,059 INFO L87 Difference]: Start difference. First operand 54 states and 85 transitions. Second operand 15 states. [2020-07-21 19:38:02,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:02,323 INFO L93 Difference]: Finished difference Result 94 states and 199 transitions. [2020-07-21 19:38:02,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:38:02,324 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 19:38:02,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:02,325 INFO L225 Difference]: With dead ends: 94 [2020-07-21 19:38:02,326 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 19:38:02,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 SyntacticMatches, 11 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=86, Invalid=294, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:38:02,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 19:38:02,336 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2020-07-21 19:38:02,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-07-21 19:38:02,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 95 transitions. [2020-07-21 19:38:02,338 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 95 transitions. Word has length 135 [2020-07-21 19:38:02,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:02,338 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 95 transitions. [2020-07-21 19:38:02,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:38:02,339 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 95 transitions. [2020-07-21 19:38:02,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:38:02,342 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:02,342 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:02,551 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:02,551 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:02,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:02,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1608635723, now seen corresponding path program 2 times [2020-07-21 19:38:02,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:02,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [850097155] [2020-07-21 19:38:02,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:02,635 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:02,635 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:02,637 INFO L263 TraceCheckSpWp]: Trace formula consists of 271 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:38:02,640 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:02,693 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 78 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2020-07-21 19:38:02,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:03,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:03,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:03,234 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:03,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:03,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:03,368 INFO L134 CoverageAnalysis]: Checked inductivity of 334 backedges. 48 proven. 82 refuted. 0 times theorem prover too weak. 204 trivial. 0 not checked. [2020-07-21 19:38:03,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [850097155] [2020-07-21 19:38:03,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:03,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:38:03,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392131560] [2020-07-21 19:38:03,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:38:03,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:03,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:38:03,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:38:03,371 INFO L87 Difference]: Start difference. First operand 62 states and 95 transitions. Second operand 13 states. [2020-07-21 19:38:03,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:03,574 INFO L93 Difference]: Finished difference Result 92 states and 161 transitions. [2020-07-21 19:38:03,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:38:03,575 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 121 [2020-07-21 19:38:03,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:03,578 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:38:03,578 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:38:03,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 221 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:38:03,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:38:03,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 65. [2020-07-21 19:38:03,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 19:38:03,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 103 transitions. [2020-07-21 19:38:03,592 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 103 transitions. Word has length 121 [2020-07-21 19:38:03,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:03,592 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 103 transitions. [2020-07-21 19:38:03,592 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:38:03,593 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 103 transitions. [2020-07-21 19:38:03,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2020-07-21 19:38:03,595 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:03,595 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 5, 5, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:03,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:03,810 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:03,811 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:03,811 INFO L82 PathProgramCache]: Analyzing trace with hash -46122593, now seen corresponding path program 3 times [2020-07-21 19:38:03,812 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:03,812 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [252530253] [2020-07-21 19:38:03,813 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:03,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:03,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:03,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:38:03,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:03,943 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 15 refuted. 0 times theorem prover too weak. 115 trivial. 0 not checked. [2020-07-21 19:38:03,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:04,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:04,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:04,240 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:04,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:04,375 INFO L134 CoverageAnalysis]: Checked inductivity of 188 backedges. 58 proven. 17 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2020-07-21 19:38:04,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [252530253] [2020-07-21 19:38:04,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:04,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 19:38:04,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482949183] [2020-07-21 19:38:04,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:38:04,380 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:04,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:38:04,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:38:04,381 INFO L87 Difference]: Start difference. First operand 65 states and 103 transitions. Second operand 11 states. [2020-07-21 19:38:04,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:04,520 INFO L93 Difference]: Finished difference Result 84 states and 140 transitions. [2020-07-21 19:38:04,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:38:04,521 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 95 [2020-07-21 19:38:04,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:04,523 INFO L225 Difference]: With dead ends: 84 [2020-07-21 19:38:04,523 INFO L226 Difference]: Without dead ends: 80 [2020-07-21 19:38:04,524 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 173 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:38:04,524 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-07-21 19:38:04,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 72. [2020-07-21 19:38:04,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 19:38:04,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 122 transitions. [2020-07-21 19:38:04,534 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 122 transitions. Word has length 95 [2020-07-21 19:38:04,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:04,535 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 122 transitions. [2020-07-21 19:38:04,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:38:04,535 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 122 transitions. [2020-07-21 19:38:04,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2020-07-21 19:38:04,537 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:04,538 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:04,750 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:04,751 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:04,751 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:04,751 INFO L82 PathProgramCache]: Analyzing trace with hash 594466134, now seen corresponding path program 4 times [2020-07-21 19:38:04,752 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:04,752 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393008271] [2020-07-21 19:38:04,752 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:04,841 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:04,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:04,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:38:04,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:04,938 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 83 proven. 24 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2020-07-21 19:38:04,939 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:05,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:05,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:05,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:05,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:05,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:05,611 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 85 proven. 26 refuted. 0 times theorem prover too weak. 141 trivial. 0 not checked. [2020-07-21 19:38:05,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393008271] [2020-07-21 19:38:05,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:05,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 19:38:05,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023387611] [2020-07-21 19:38:05,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:38:05,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:05,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:38:05,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:38:05,615 INFO L87 Difference]: Start difference. First operand 72 states and 122 transitions. Second operand 13 states. [2020-07-21 19:38:05,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:05,808 INFO L93 Difference]: Finished difference Result 92 states and 158 transitions. [2020-07-21 19:38:05,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:38:05,808 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 107 [2020-07-21 19:38:05,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:05,812 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:38:05,812 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:38:05,813 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:38:05,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:38:05,828 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 73. [2020-07-21 19:38:05,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 19:38:05,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-21 19:38:05,831 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 107 [2020-07-21 19:38:05,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:05,832 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-21 19:38:05,832 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:38:05,833 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-21 19:38:05,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 19:38:05,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:05,835 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:06,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:06,049 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:06,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:06,049 INFO L82 PathProgramCache]: Analyzing trace with hash 235412830, now seen corresponding path program 5 times [2020-07-21 19:38:06,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:06,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951229317] [2020-07-21 19:38:06,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:06,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:06,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:06,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:38:06,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:06,211 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 19 refuted. 0 times theorem prover too weak. 175 trivial. 0 not checked. [2020-07-21 19:38:06,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:06,456 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:06,509 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:06,543 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:06,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:06,632 INFO L134 CoverageAnalysis]: Checked inductivity of 257 backedges. 63 proven. 20 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 19:38:06,632 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951229317] [2020-07-21 19:38:06,633 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:06,633 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 19:38:06,633 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [539251576] [2020-07-21 19:38:06,634 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:38:06,635 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:06,635 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:38:06,635 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:38:06,635 INFO L87 Difference]: Start difference. First operand 73 states and 119 transitions. Second operand 11 states. [2020-07-21 19:38:06,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:06,768 INFO L93 Difference]: Finished difference Result 91 states and 155 transitions. [2020-07-21 19:38:06,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:38:06,769 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 108 [2020-07-21 19:38:06,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:06,771 INFO L225 Difference]: With dead ends: 91 [2020-07-21 19:38:06,771 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 19:38:06,772 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 199 SyntacticMatches, 7 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:38:06,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 19:38:06,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 73. [2020-07-21 19:38:06,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-07-21 19:38:06,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 119 transitions. [2020-07-21 19:38:06,787 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 119 transitions. Word has length 108 [2020-07-21 19:38:06,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:06,788 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 119 transitions. [2020-07-21 19:38:06,788 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:38:06,788 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 119 transitions. [2020-07-21 19:38:06,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-21 19:38:06,791 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:06,792 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:07,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:07,006 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:07,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:07,007 INFO L82 PathProgramCache]: Analyzing trace with hash -1540036056, now seen corresponding path program 6 times [2020-07-21 19:38:07,007 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:07,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1594687874] [2020-07-21 19:38:07,008 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:07,152 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:07,153 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 19:38:07,153 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:38:07,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 19:38:07,189 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 19:38:07,264 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 19:38:07,266 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 19:38:07,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:07,537 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 07:38:07 BoogieIcfgContainer [2020-07-21 19:38:07,538 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 19:38:07,550 INFO L168 Benchmark]: Toolchain (without parser) took 19268.49 ms. Allocated memory was 137.4 MB in the beginning and 380.1 MB in the end (delta: 242.7 MB). Free memory was 102.1 MB in the beginning and 249.9 MB in the end (delta: -147.8 MB). Peak memory consumption was 95.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,551 INFO L168 Benchmark]: CDTParser took 0.39 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,551 INFO L168 Benchmark]: CACSL2BoogieTranslator took 382.10 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 92.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,552 INFO L168 Benchmark]: Boogie Preprocessor took 149.28 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 92.1 MB in the beginning and 181.2 MB in the end (delta: -89.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,552 INFO L168 Benchmark]: RCFGBuilder took 358.81 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 167.7 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,555 INFO L168 Benchmark]: TraceAbstraction took 18368.71 ms. Allocated memory was 202.4 MB in the beginning and 380.1 MB in the end (delta: 177.7 MB). Free memory was 167.0 MB in the beginning and 249.9 MB in the end (delta: -82.9 MB). Peak memory consumption was 94.8 MB. Max. memory is 7.1 GB. [2020-07-21 19:38:07,563 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.39 ms. Allocated memory is still 137.4 MB. Free memory was 120.0 MB in the beginning and 119.8 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 382.10 ms. Allocated memory is still 137.4 MB. Free memory was 101.7 MB in the beginning and 92.1 MB in the end (delta: 9.6 MB). Peak memory consumption was 9.6 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 149.28 ms. Allocated memory was 137.4 MB in the beginning and 202.4 MB in the end (delta: 65.0 MB). Free memory was 92.1 MB in the beginning and 181.2 MB in the end (delta: -89.1 MB). Peak memory consumption was 14.0 MB. Max. memory is 7.1 GB. * RCFGBuilder took 358.81 ms. Allocated memory is still 202.4 MB. Free memory was 181.2 MB in the beginning and 167.7 MB in the end (delta: 13.5 MB). Peak memory consumption was 13.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 18368.71 ms. Allocated memory was 202.4 MB in the beginning and 380.1 MB in the end (delta: 177.7 MB). Free memory was 167.0 MB in the beginning and 249.9 MB in the end (delta: -82.9 MB). Peak memory consumption was 94.8 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 = 5; VAL [x=5] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=5] [L8] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L10] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L13] CALL, EXPR fibo2(n-1) 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-1) VAL [\old(n)=5, fibo2(n-1)=3, n=5] [L13] CALL, EXPR fibo2(n-2) 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-2) VAL [\old(n)=5, fibo2(n-1)=3, fibo2(n-2)=2, n=5] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=5, x=5] [L37] int result = fibo1(x); [L38] COND TRUE result == 5 VAL [result=5, x=5] [L39] __VERIFIER_error() VAL [result=5, x=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 18.1s, OverallIterations: 17, TraceHistogramMax: 11, AutomataDifference: 3.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 372 SDtfs, 566 SDslu, 1730 SDs, 0 SdLazy, 1686 SolverSat, 422 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2277 GetRequests, 1968 SyntacticMatches, 107 SemanticMatches, 202 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=73occurred in iteration=15, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 16 MinimizatonAttempts, 185 StatesRemovedByMinimization, 14 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.5s SatisfiabilityAnalysisTime, 9.3s InterpolantComputationTime, 1235 NumberOfCodeBlocks, 1196 NumberOfCodeBlocksAsserted, 30 NumberOfCheckSat, 2195 ConstructedInterpolants, 0 QuantifiedInterpolants, 369157 SizeOfPredicates, 67 NumberOfNonLiveVariables, 2470 ConjunctsInSsa, 134 ConjunctsInUnsatCore, 30 InterpolantComputations, 2 PerfectInterpolantSequences, 3471/4520 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...