/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --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_6-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 13:19:33,196 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 13:19:33,222 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 13:19:33,225 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 13:19:33,227 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 13:19:33,239 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 13:19:33,244 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 13:19:33,246 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 13:19:33,248 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 13:19:33,249 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 13:19:33,249 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 13:19:33,252 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 13:19:33,255 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 13:19:33,256 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 13:19:33,258 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 13:19:33,260 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 13:19:33,261 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 13:19:33,267 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 13:19:33,272 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 13:19:33,274 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 13:19:33,275 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 13:19:33,276 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 13:19:33,280 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 13:19:33,287 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 13:19:33,288 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 13:19:33,289 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 13:19:33,290 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 13:19:33,305 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 13:19:33,306 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 13:19:33,307 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 13:19:33,307 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 13:19:33,308 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 13:19:33,308 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 13:19:33,308 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 13:19:33,308 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 13:19:33,309 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 13:19:33,310 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 13:19:33,310 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 13:19:33,310 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 13:19:33,310 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 13:19:33,310 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 13:19:33,311 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 13:19:33,311 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 13:19:33,311 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 13:19:33,311 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 13:19:33,311 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 13:19:33,312 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 13:19:33,312 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 13:19:33,312 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:33,312 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 13:19:33,312 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 13:19:33,313 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS 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 13:19:33,623 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 13:19:33,645 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 13:19:33,649 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 13:19:33,653 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 13:19:33,653 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 13:19:33,655 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 13:19:33,741 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4835864a1/b02be28d8238424691da4101155a7b16/FLAG6d78929ca [2020-07-21 13:19:34,264 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 13:19:34,267 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_6-2.c [2020-07-21 13:19:34,275 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4835864a1/b02be28d8238424691da4101155a7b16/FLAG6d78929ca [2020-07-21 13:19:34,658 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4835864a1/b02be28d8238424691da4101155a7b16 [2020-07-21 13:19:34,673 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 13:19:34,679 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 13:19:34,683 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 13:19:34,683 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 13:19:34,688 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 13:19:34,690 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:34,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@89a6699 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34, skipping insertion in model container [2020-07-21 13:19:34,693 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:34,705 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 13:19:34,732 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 13:19:34,954 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:19:34,959 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 13:19:34,979 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 13:19:34,993 INFO L208 MainTranslator]: Completed translation [2020-07-21 13:19:34,994 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34 WrapperNode [2020-07-21 13:19:34,994 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 13:19:34,995 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 13:19:34,995 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 13:19:34,995 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 13:19:35,007 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,008 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,114 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,115 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,120 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,122 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,123 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (1/1) ... [2020-07-21 13:19:35,125 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 13:19:35,125 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 13:19:35,125 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 13:19:35,126 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 13:19:35,127 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (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 13:19:35,196 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 13:19:35,197 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 13:19:35,197 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 13:19:35,197 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 13:19:35,197 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 13:19:35,198 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 13:19:35,199 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 13:19:35,462 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 13:19:35,462 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 13:19:35,467 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:19:35 BoogieIcfgContainer [2020-07-21 13:19:35,467 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 13:19:35,486 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 13:19:35,487 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 13:19:35,496 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 13:19:35,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:19:34" (1/3) ... [2020-07-21 13:19:35,498 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d69980 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:19:35, skipping insertion in model container [2020-07-21 13:19:35,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:19:34" (2/3) ... [2020-07-21 13:19:35,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47d69980 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:19:35, skipping insertion in model container [2020-07-21 13:19:35,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:19:35" (3/3) ... [2020-07-21 13:19:35,501 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_6-2.c [2020-07-21 13:19:35,532 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 13:19:35,541 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 13:19:35,556 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 13:19:35,583 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 13:19:35,584 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 13:19:35,584 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 13:19:35,584 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 13:19:35,584 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 13:19:35,585 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 13:19:35,585 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 13:19:35,585 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 13:19:35,603 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 13:19:35,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 13:19:35,610 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:35,611 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:35,611 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:35,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:35,617 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 13:19:35,624 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:35,625 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1612358528] [2020-07-21 13:19:35,625 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 13:19:35,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:35,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:35,709 INFO L263 TraceCheckSpWp]: Trace formula consists of 31 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:19:35,714 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:35,804 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 13:19:35,805 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:19:35,806 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1612358528] [2020-07-21 13:19:35,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:19:35,807 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:19:35,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1849688321] [2020-07-21 13:19:35,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:19:35,815 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:35,825 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:19:35,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:19:35,828 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 13:19:35,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:35,959 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 13:19:35,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:19:35,962 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 13:19:35,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:35,973 INFO L225 Difference]: With dead ends: 44 [2020-07-21 13:19:35,974 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 13:19:35,978 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 13:19:35,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 13:19:36,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 13:19:36,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:19:36,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:19:36,032 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 13:19:36,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:36,033 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:19:36,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:19:36,033 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:19:36,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 13:19:36,035 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:36,036 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:36,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:36,254 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:36,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:36,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 13:19:36,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:36,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2074772127] [2020-07-21 13:19:36,257 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:19:36,298 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:36,298 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:36,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 13:19:36,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:36,331 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 13:19:36,332 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 13:19:36,332 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2074772127] [2020-07-21 13:19:36,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 13:19:36,333 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 13:19:36,333 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117979769] [2020-07-21 13:19:36,336 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 13:19:36,336 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:36,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 13:19:36,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 13:19:36,337 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 13:19:36,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:36,416 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 13:19:36,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 13:19:36,417 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 13:19:36,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:36,419 INFO L225 Difference]: With dead ends: 36 [2020-07-21 13:19:36,420 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 13:19:36,421 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 13:19:36,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 13:19:36,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 13:19:36,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 13:19:36,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 13:19:36,432 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 13:19:36,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:36,433 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 13:19:36,433 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 13:19:36,433 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 13:19:36,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 13:19:36,435 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:36,435 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 13:19:36,649 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:36,650 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:36,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:36,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 13:19:36,652 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:36,652 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612509878] [2020-07-21 13:19:36,653 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 13:19:36,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:36,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:36,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:19:36,698 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:36,780 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 13:19:36,781 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:37,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:37,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:37,093 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 13:19:37,094 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612509878] [2020-07-21 13:19:37,094 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:37,094 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:19:37,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [442541397] [2020-07-21 13:19:37,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:19:37,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:37,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:19:37,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:19:37,097 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 13:19:37,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:37,215 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 13:19:37,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:19:37,216 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 13:19:37,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:37,219 INFO L225 Difference]: With dead ends: 41 [2020-07-21 13:19:37,219 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 13:19:37,220 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 13:19:37,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 13:19:37,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 13:19:37,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:19:37,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:19:37,231 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 13:19:37,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:37,232 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:19:37,232 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:19:37,232 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:19:37,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 13:19:37,234 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:37,234 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 13:19:37,448 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:37,449 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:37,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:37,449 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 13:19:37,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:37,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [320891957] [2020-07-21 13:19:37,450 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 13:19:37,507 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:37,507 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:37,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 13:19:37,510 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:37,554 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 13:19:37,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:37,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:37,685 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:37,726 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 13:19:37,727 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [320891957] [2020-07-21 13:19:37,727 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:37,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 13:19:37,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913261186] [2020-07-21 13:19:37,728 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 13:19:37,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:37,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 13:19:37,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 13:19:37,729 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 13:19:37,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:37,858 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 13:19:37,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 13:19:37,859 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 13:19:37,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:37,861 INFO L225 Difference]: With dead ends: 46 [2020-07-21 13:19:37,861 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 13:19:37,862 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 13:19:37,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 13:19:37,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 13:19:37,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 13:19:37,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 13:19:37,873 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 13:19:37,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:37,873 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 13:19:37,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 13:19:37,874 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 13:19:37,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 13:19:37,876 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:37,876 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 13:19:38,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:38,091 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:38,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:38,092 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 13:19:38,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:38,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [137331656] [2020-07-21 13:19:38,092 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 13:19:38,134 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:38,134 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:38,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:19:38,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:38,199 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 13:19:38,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:38,442 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:38,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:38,528 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:38,575 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 13:19:38,576 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [137331656] [2020-07-21 13:19:38,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:38,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:19:38,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [490391255] [2020-07-21 13:19:38,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:19:38,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:38,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:19:38,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:19:38,580 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 13:19:38,776 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:38,777 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 13:19:38,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:19:38,777 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 13:19:38,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:38,781 INFO L225 Difference]: With dead ends: 51 [2020-07-21 13:19:38,781 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 13:19:38,786 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 13:19:38,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 13:19:38,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 13:19:38,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:19:38,799 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:19:38,800 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 13:19:38,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:38,800 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:19:38,800 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:19:38,801 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:19:38,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 13:19:38,803 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:38,803 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 13:19:39,018 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:39,019 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:39,020 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:39,020 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 13:19:39,021 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:39,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1018183405] [2020-07-21 13:19:39,022 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 13:19:39,056 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:39,056 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:39,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:19:39,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:39,127 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 13:19:39,128 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:39,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:39,422 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:39,423 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:39,462 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 13:19:39,463 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1018183405] [2020-07-21 13:19:39,464 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:39,464 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 13:19:39,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [646699007] [2020-07-21 13:19:39,465 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 13:19:39,465 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:39,466 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 13:19:39,466 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 13:19:39,466 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 13:19:39,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:39,660 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 13:19:39,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:19:39,661 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 13:19:39,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:39,668 INFO L225 Difference]: With dead ends: 56 [2020-07-21 13:19:39,669 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 13:19:39,670 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 13:19:39,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 13:19:39,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 13:19:39,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 13:19:39,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 13:19:39,691 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 13:19:39,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:39,694 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 13:19:39,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 13:19:39,694 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 13:19:39,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 13:19:39,700 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:39,700 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 13:19:39,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:39,918 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:39,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:39,919 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 13:19:39,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:39,919 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775064443] [2020-07-21 13:19:39,920 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 13:19:39,988 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:39,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:39,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:19:39,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:40,049 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 13:19:40,050 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:40,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:40,410 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:40,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:40,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:40,617 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 13:19:40,618 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775064443] [2020-07-21 13:19:40,618 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:40,618 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:19:40,618 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [522070155] [2020-07-21 13:19:40,619 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:19:40,619 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:40,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:19:40,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:19:40,620 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 13:19:40,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:40,834 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 13:19:40,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:19:40,834 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 13:19:40,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:40,837 INFO L225 Difference]: With dead ends: 61 [2020-07-21 13:19:40,837 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 13:19:40,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:19:40,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 13:19:40,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 13:19:40,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:19:40,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:19:40,849 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 13:19:40,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:40,850 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:19:40,850 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:19:40,850 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:19:40,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 13:19:40,852 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:40,853 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 13:19:41,065 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:41,066 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:41,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:41,067 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 13:19:41,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:41,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1393679675] [2020-07-21 13:19:41,068 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 13:19:41,115 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:41,116 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:41,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:19:41,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:41,187 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 13:19:41,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:41,525 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:41,527 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:41,622 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:41,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:41,673 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:41,711 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 13:19:41,712 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1393679675] [2020-07-21 13:19:41,712 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:41,713 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 13:19:41,713 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [988085024] [2020-07-21 13:19:41,714 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 13:19:41,714 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:41,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 13:19:41,715 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 13:19:41,715 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 13:19:41,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:41,911 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 13:19:41,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:19:41,912 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 13:19:41,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:41,914 INFO L225 Difference]: With dead ends: 66 [2020-07-21 13:19:41,915 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 13:19:41,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 13:19:41,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 13:19:41,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 13:19:41,927 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 13:19:41,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 13:19:41,929 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 13:19:41,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:41,929 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 13:19:41,930 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 13:19:41,930 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 13:19:41,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 13:19:41,932 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:41,932 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 13:19:42,144 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:42,145 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:42,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:42,146 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 13:19:42,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:42,148 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [256596842] [2020-07-21 13:19:42,148 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 13:19:42,224 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:42,224 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:42,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:19:42,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:42,323 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 13:19:42,323 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:42,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:42,894 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,183 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:43,250 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 13:19:43,251 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [256596842] [2020-07-21 13:19:43,251 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:43,252 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 13:19:43,252 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1726325033] [2020-07-21 13:19:43,253 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 13:19:43,253 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:43,253 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 13:19:43,254 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 13:19:43,254 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 13:19:43,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:43,507 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 13:19:43,508 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:43,508 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 13:19:43,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:43,511 INFO L225 Difference]: With dead ends: 71 [2020-07-21 13:19:43,511 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:19:43,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 13:19:43,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:19:43,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 13:19:43,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:19:43,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:19:43,524 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 13:19:43,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:43,525 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:19:43,525 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 13:19:43,525 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:19:43,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 13:19:43,528 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:43,528 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 13:19:43,744 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:43,745 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:43,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:43,746 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 13:19:43,746 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:43,747 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [5623359] [2020-07-21 13:19:43,747 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 13:19:43,816 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:43,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:43,818 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:19:43,822 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:43,899 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 13:19:43,900 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:44,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:44,655 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:44,761 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:44,809 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:44,856 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 13:19:44,857 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [5623359] [2020-07-21 13:19:44,857 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:44,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:19:44,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648585143] [2020-07-21 13:19:44,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:44,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:44,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:44,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:44,862 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 15 states. [2020-07-21 13:19:45,104 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:45,105 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 13:19:45,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:45,105 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 108 [2020-07-21 13:19:45,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:45,108 INFO L225 Difference]: With dead ends: 76 [2020-07-21 13:19:45,108 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 13:19:45,109 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 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 13:19:45,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 13:19:45,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 13:19:45,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 13:19:45,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 13:19:45,137 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 13:19:45,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:45,138 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 13:19:45,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:45,138 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 13:19:45,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 13:19:45,145 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:45,145 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:45,360 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:45,362 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:45,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:45,363 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 13:19:45,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:45,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [971860050] [2020-07-21 13:19:45,364 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 13:19:45,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:45,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:45,473 INFO L263 TraceCheckSpWp]: Trace formula consists of 466 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:19:45,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:45,649 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 13:19:45,649 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:46,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:46,987 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:46,988 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:47,310 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 13:19:47,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [971860050] [2020-07-21 13:19:47,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:47,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:19:47,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421990390] [2020-07-21 13:19:47,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:47,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:47,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:47,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:47,314 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 17 states. [2020-07-21 13:19:47,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:47,592 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 13:19:47,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:47,593 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 208 [2020-07-21 13:19:47,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:47,597 INFO L225 Difference]: With dead ends: 81 [2020-07-21 13:19:47,597 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 13:19:47,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:19:47,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 13:19:47,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 13:19:47,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 13:19:47,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 13:19:47,609 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 13:19:47,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:47,610 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 13:19:47,610 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:47,611 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 13:19:47,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 13:19:47,613 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:47,613 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:47,826 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:47,827 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:47,828 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:47,828 INFO L82 PathProgramCache]: Analyzing trace with hash -1298373331, now seen corresponding path program 2 times [2020-07-21 13:19:47,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:47,829 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453847673] [2020-07-21 13:19:47,829 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 13:19:47,938 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:47,939 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:47,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:19:47,944 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:48,013 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 156 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-21 13:19:48,013 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:48,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,839 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,930 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:48,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:49,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:49,094 INFO L134 CoverageAnalysis]: Checked inductivity of 543 backedges. 42 proven. 164 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-21 13:19:49,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453847673] [2020-07-21 13:19:49,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:49,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:19:49,096 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355747857] [2020-07-21 13:19:49,098 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:49,098 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:49,099 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:49,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:49,099 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 15 states. [2020-07-21 13:19:49,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:49,307 INFO L93 Difference]: Finished difference Result 99 states and 221 transitions. [2020-07-21 13:19:49,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:49,312 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 13:19:49,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:49,314 INFO L225 Difference]: With dead ends: 99 [2020-07-21 13:19:49,315 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 13:19:49,316 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 272 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 13:19:49,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 13:19:49,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 57. [2020-07-21 13:19:49,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 13:19:49,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 92 transitions. [2020-07-21 13:19:49,341 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 92 transitions. Word has length 148 [2020-07-21 13:19:49,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:49,342 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 92 transitions. [2020-07-21 13:19:49,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:49,342 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 92 transitions. [2020-07-21 13:19:49,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-21 13:19:49,347 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:49,347 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:49,548 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:49,549 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:49,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:49,550 INFO L82 PathProgramCache]: Analyzing trace with hash 2095197631, now seen corresponding path program 1 times [2020-07-21 13:19:49,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:49,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527862867] [2020-07-21 13:19:49,551 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 13:19:49,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:49,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:49,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:19:49,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:49,719 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 89 refuted. 0 times theorem prover too weak. 221 trivial. 0 not checked. [2020-07-21 13:19:49,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:50,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:50,249 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:50,296 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:50,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:50,386 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 48 proven. 94 refuted. 0 times theorem prover too weak. 216 trivial. 0 not checked. [2020-07-21 13:19:50,386 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527862867] [2020-07-21 13:19:50,387 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:50,387 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:19:50,387 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [647321342] [2020-07-21 13:19:50,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:19:50,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:50,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:19:50,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:19:50,389 INFO L87 Difference]: Start difference. First operand 57 states and 92 transitions. Second operand 13 states. [2020-07-21 13:19:50,582 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:50,583 INFO L93 Difference]: Finished difference Result 99 states and 217 transitions. [2020-07-21 13:19:50,583 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:19:50,584 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 123 [2020-07-21 13:19:50,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:50,588 INFO L225 Difference]: With dead ends: 99 [2020-07-21 13:19:50,588 INFO L226 Difference]: Without dead ends: 95 [2020-07-21 13:19:50,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 226 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 13:19:50,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-07-21 13:19:50,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 59. [2020-07-21 13:19:50,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 13:19:50,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 98 transitions. [2020-07-21 13:19:50,612 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 98 transitions. Word has length 123 [2020-07-21 13:19:50,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:50,612 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 98 transitions. [2020-07-21 13:19:50,612 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:19:50,613 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 98 transitions. [2020-07-21 13:19:50,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2020-07-21 13:19:50,617 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:50,617 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 11, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:50,830 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:50,831 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:50,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:50,832 INFO L82 PathProgramCache]: Analyzing trace with hash 1017418174, now seen corresponding path program 1 times [2020-07-21 13:19:50,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:50,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1685428667] [2020-07-21 13:19:50,833 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 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 13:19:50,960 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:50,961 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:50,963 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:19:50,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:51,081 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 114 proven. 290 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2020-07-21 13:19:51,082 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:52,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,238 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,516 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,665 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,811 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,812 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,869 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:52,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 116 proven. 304 refuted. 0 times theorem prover too weak. 829 trivial. 0 not checked. [2020-07-21 13:19:52,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1685428667] [2020-07-21 13:19:52,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:52,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:19:52,923 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1335240724] [2020-07-21 13:19:52,923 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:52,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:52,924 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:52,924 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:52,925 INFO L87 Difference]: Start difference. First operand 59 states and 98 transitions. Second operand 17 states. [2020-07-21 13:19:53,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:53,283 INFO L93 Difference]: Finished difference Result 113 states and 271 transitions. [2020-07-21 13:19:53,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:53,284 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 216 [2020-07-21 13:19:53,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:53,286 INFO L225 Difference]: With dead ends: 113 [2020-07-21 13:19:53,286 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 13:19:53,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 437 GetRequests, 403 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:19:53,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 13:19:53,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2020-07-21 13:19:53,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-07-21 13:19:53,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 104 transitions. [2020-07-21 13:19:53,319 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 104 transitions. Word has length 216 [2020-07-21 13:19:53,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:53,320 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 104 transitions. [2020-07-21 13:19:53,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:53,320 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 104 transitions. [2020-07-21 13:19:53,323 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2020-07-21 13:19:53,323 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:53,323 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 7, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:53,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:53,538 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:53,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:53,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1521837768, now seen corresponding path program 2 times [2020-07-21 13:19:53,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:53,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222214242] [2020-07-21 13:19:53,540 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 13:19:53,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:53,649 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:53,651 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:19:53,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:53,723 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 114 refuted. 0 times theorem prover too weak. 254 trivial. 0 not checked. [2020-07-21 13:19:53,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:54,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,652 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:54,691 INFO L134 CoverageAnalysis]: Checked inductivity of 430 backedges. 62 proven. 122 refuted. 0 times theorem prover too weak. 246 trivial. 0 not checked. [2020-07-21 13:19:54,691 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222214242] [2020-07-21 13:19:54,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:54,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:19:54,692 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1476302324] [2020-07-21 13:19:54,693 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:19:54,693 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:54,693 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:19:54,694 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:19:54,694 INFO L87 Difference]: Start difference. First operand 67 states and 104 transitions. Second operand 15 states. [2020-07-21 13:19:54,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:54,962 INFO L93 Difference]: Finished difference Result 107 states and 201 transitions. [2020-07-21 13:19:54,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:19:54,963 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 135 [2020-07-21 13:19:54,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:54,965 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:19:54,966 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 13:19:54,968 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 274 GetRequests, 245 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 13:19:54,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 13:19:54,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 70. [2020-07-21 13:19:54,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 13:19:54,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 112 transitions. [2020-07-21 13:19:54,980 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 112 transitions. Word has length 135 [2020-07-21 13:19:54,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:54,980 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 112 transitions. [2020-07-21 13:19:54,981 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:19:54,981 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 112 transitions. [2020-07-21 13:19:54,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 13:19:54,984 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:54,984 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:55,197 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:55,198 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:55,199 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:55,199 INFO L82 PathProgramCache]: Analyzing trace with hash 1102424554, now seen corresponding path program 3 times [2020-07-21 13:19:55,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:55,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2025377406] [2020-07-21 13:19:55,200 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 13:19:55,366 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:55,367 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:55,369 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:19:55,373 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:55,486 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 114 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2020-07-21 13:19:55,486 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:56,402 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,936 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:56,992 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:57,070 INFO L134 CoverageAnalysis]: Checked inductivity of 657 backedges. 159 proven. 130 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 13:19:57,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2025377406] [2020-07-21 13:19:57,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:57,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:19:57,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195028725] [2020-07-21 13:19:57,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:19:57,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:57,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:19:57,074 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:19:57,074 INFO L87 Difference]: Start difference. First operand 70 states and 112 transitions. Second operand 17 states. [2020-07-21 13:19:57,453 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:57,453 INFO L93 Difference]: Finished difference Result 107 states and 197 transitions. [2020-07-21 13:19:57,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:19:57,454 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 163 [2020-07-21 13:19:57,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:57,456 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:19:57,457 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 13:19:57,459 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 297 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:19:57,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 13:19:57,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 13:19:57,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 13:19:57,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 115 transitions. [2020-07-21 13:19:57,468 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 115 transitions. Word has length 163 [2020-07-21 13:19:57,468 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:57,468 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 115 transitions. [2020-07-21 13:19:57,468 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:19:57,469 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 115 transitions. [2020-07-21 13:19:57,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 137 [2020-07-21 13:19:57,471 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:57,471 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 8, 7, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:57,687 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:57,687 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:57,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:57,688 INFO L82 PathProgramCache]: Analyzing trace with hash -2102107778, now seen corresponding path program 4 times [2020-07-21 13:19:57,688 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:57,688 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [739981408] [2020-07-21 13:19:57,688 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 13:19:57,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:57,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:57,824 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:19:57,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:57,891 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 76 refuted. 0 times theorem prover too weak. 282 trivial. 0 not checked. [2020-07-21 13:19:57,891 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:58,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:58,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:58,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:58,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:58,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:19:58,614 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 79 proven. 81 refuted. 0 times theorem prover too weak. 277 trivial. 0 not checked. [2020-07-21 13:19:58,615 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [739981408] [2020-07-21 13:19:58,615 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:19:58,615 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:19:58,616 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573032406] [2020-07-21 13:19:58,616 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:19:58,616 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:19:58,617 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:19:58,617 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:19:58,617 INFO L87 Difference]: Start difference. First operand 75 states and 115 transitions. Second operand 13 states. [2020-07-21 13:19:58,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:19:58,812 INFO L93 Difference]: Finished difference Result 107 states and 179 transitions. [2020-07-21 13:19:58,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:19:58,812 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 136 [2020-07-21 13:19:58,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:19:58,815 INFO L225 Difference]: With dead ends: 107 [2020-07-21 13:19:58,815 INFO L226 Difference]: Without dead ends: 100 [2020-07-21 13:19:58,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 275 GetRequests, 251 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 13:19:58,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-07-21 13:19:58,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 82. [2020-07-21 13:19:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 13:19:58,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 136 transitions. [2020-07-21 13:19:58,829 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 136 transitions. Word has length 136 [2020-07-21 13:19:58,829 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:19:58,829 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 136 transitions. [2020-07-21 13:19:58,829 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:19:58,829 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 136 transitions. [2020-07-21 13:19:58,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2020-07-21 13:19:58,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:19:58,833 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 8, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:19:59,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:59,048 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:19:59,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:19:59,049 INFO L82 PathProgramCache]: Analyzing trace with hash -1316077641, now seen corresponding path program 5 times [2020-07-21 13:19:59,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:19:59,050 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812136382] [2020-07-21 13:19:59,050 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 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:19:59,185 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:19:59,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:19:59,187 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:19:59,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:19:59,270 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 106 proven. 98 refuted. 0 times theorem prover too weak. 325 trivial. 0 not checked. [2020-07-21 13:19:59,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:19:59,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,081 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,175 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,284 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:00,381 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 108 proven. 104 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2020-07-21 13:20:00,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812136382] [2020-07-21 13:20:00,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:00,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:20:00,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1951127556] [2020-07-21 13:20:00,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:20:00,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:00,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:20:00,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:20:00,387 INFO L87 Difference]: Start difference. First operand 82 states and 136 transitions. Second operand 15 states. [2020-07-21 13:20:00,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:00,614 INFO L93 Difference]: Finished difference Result 117 states and 203 transitions. [2020-07-21 13:20:00,615 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:20:00,615 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 148 [2020-07-21 13:20:00,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:00,618 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:20:00,619 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 13:20:00,620 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 271 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 13:20:00,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 13:20:00,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 80. [2020-07-21 13:20:00,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 13:20:00,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 13:20:00,631 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 148 [2020-07-21 13:20:00,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:00,631 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 13:20:00,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:20:00,631 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 13:20:00,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2020-07-21 13:20:00,633 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:00,634 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 7, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:00,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:00,848 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:00,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:00,848 INFO L82 PathProgramCache]: Analyzing trace with hash -872965087, now seen corresponding path program 6 times [2020-07-21 13:20:00,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:00,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1611592239] [2020-07-21 13:20:00,849 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:00,989 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:00,990 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:00,994 INFO L263 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:20:00,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:01,056 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 81 refuted. 0 times theorem prover too weak. 368 trivial. 0 not checked. [2020-07-21 13:20:01,056 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:01,496 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,583 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,680 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:01,819 INFO L134 CoverageAnalysis]: Checked inductivity of 537 backedges. 88 proven. 85 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:20:01,820 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1611592239] [2020-07-21 13:20:01,820 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:01,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:20:01,821 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913394407] [2020-07-21 13:20:01,824 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:20:01,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:01,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:20:01,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:20:01,825 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 13:20:02,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:02,026 INFO L93 Difference]: Finished difference Result 114 states and 190 transitions. [2020-07-21 13:20:02,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:20:02,027 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 149 [2020-07-21 13:20:02,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:02,030 INFO L225 Difference]: With dead ends: 114 [2020-07-21 13:20:02,030 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 13:20:02,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 277 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 13:20:02,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 13:20:02,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 80. [2020-07-21 13:20:02,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-07-21 13:20:02,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 128 transitions. [2020-07-21 13:20:02,045 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 128 transitions. Word has length 149 [2020-07-21 13:20:02,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:02,048 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 128 transitions. [2020-07-21 13:20:02,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:20:02,049 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 128 transitions. [2020-07-21 13:20:02,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2020-07-21 13:20:02,051 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:02,052 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 9, 8, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:02,265 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:02,267 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:02,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:02,267 INFO L82 PathProgramCache]: Analyzing trace with hash -529934979, now seen corresponding path program 7 times [2020-07-21 13:20:02,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:02,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988829561] [2020-07-21 13:20:02,268 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:02,442 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:02,442 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:02,443 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:20:02,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:02,511 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 141 proven. 34 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2020-07-21 13:20:02,511 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:02,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:03,082 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:03,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:03,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:03,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:03,385 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 143 proven. 37 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 13:20:03,385 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988829561] [2020-07-21 13:20:03,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:03,386 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:20:03,386 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [982174019] [2020-07-21 13:20:03,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:20:03,388 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:03,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:20:03,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:20:03,389 INFO L87 Difference]: Start difference. First operand 80 states and 128 transitions. Second operand 13 states. [2020-07-21 13:20:03,559 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:03,559 INFO L93 Difference]: Finished difference Result 106 states and 183 transitions. [2020-07-21 13:20:03,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:20:03,560 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 150 [2020-07-21 13:20:03,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:03,562 INFO L225 Difference]: With dead ends: 106 [2020-07-21 13:20:03,563 INFO L226 Difference]: Without dead ends: 99 [2020-07-21 13:20:03,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 303 GetRequests, 279 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 13:20:03,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-21 13:20:03,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-21 13:20:03,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-21 13:20:03,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 161 transitions. [2020-07-21 13:20:03,578 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 161 transitions. Word has length 150 [2020-07-21 13:20:03,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:03,578 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 161 transitions. [2020-07-21 13:20:03,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:20:03,579 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 161 transitions. [2020-07-21 13:20:03,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 163 [2020-07-21 13:20:03,581 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:03,581 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 9, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 4, 4, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:03,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:03,796 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:03,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:03,797 INFO L82 PathProgramCache]: Analyzing trace with hash 1102006884, now seen corresponding path program 8 times [2020-07-21 13:20:03,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:03,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1043609132] [2020-07-21 13:20:03,799 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:03,952 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:03,953 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:03,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:20:03,957 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:04,084 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 185 proven. 49 refuted. 0 times theorem prover too weak. 422 trivial. 0 not checked. [2020-07-21 13:20:04,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:04,705 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:04,706 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:04,847 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:04,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:04,984 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:04,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:05,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:05,203 INFO L134 CoverageAnalysis]: Checked inductivity of 656 backedges. 187 proven. 55 refuted. 0 times theorem prover too weak. 414 trivial. 0 not checked. [2020-07-21 13:20:05,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1043609132] [2020-07-21 13:20:05,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:05,204 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:20:05,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278839874] [2020-07-21 13:20:05,206 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:20:05,206 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:05,207 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:20:05,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:20:05,207 INFO L87 Difference]: Start difference. First operand 92 states and 161 transitions. Second operand 15 states. [2020-07-21 13:20:05,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:05,440 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 13:20:05,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:20:05,440 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 162 [2020-07-21 13:20:05,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:05,443 INFO L225 Difference]: With dead ends: 117 [2020-07-21 13:20:05,443 INFO L226 Difference]: Without dead ends: 110 [2020-07-21 13:20:05,445 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 328 GetRequests, 299 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 13:20:05,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-07-21 13:20:05,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 96. [2020-07-21 13:20:05,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2020-07-21 13:20:05,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 158 transitions. [2020-07-21 13:20:05,456 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 158 transitions. Word has length 162 [2020-07-21 13:20:05,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:05,457 INFO L479 AbstractCegarLoop]: Abstraction has 96 states and 158 transitions. [2020-07-21 13:20:05,457 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:20:05,457 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 158 transitions. [2020-07-21 13:20:05,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 164 [2020-07-21 13:20:05,459 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:05,460 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 8, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:05,673 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:05,674 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:05,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:05,674 INFO L82 PathProgramCache]: Analyzing trace with hash 1920867700, now seen corresponding path program 9 times [2020-07-21 13:20:05,675 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:05,675 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1576370757] [2020-07-21 13:20:05,676 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:05,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:05,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:05,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 364 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:20:05,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:05,914 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 37 refuted. 0 times theorem prover too weak. 479 trivial. 0 not checked. [2020-07-21 13:20:05,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:06,386 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:06,777 INFO L134 CoverageAnalysis]: Checked inductivity of 665 backedges. 149 proven. 43 refuted. 0 times theorem prover too weak. 473 trivial. 0 not checked. [2020-07-21 13:20:06,778 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1576370757] [2020-07-21 13:20:06,778 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:06,778 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:20:06,779 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194891125] [2020-07-21 13:20:06,779 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:20:06,779 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:06,780 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:20:06,780 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:20:06,780 INFO L87 Difference]: Start difference. First operand 96 states and 158 transitions. Second operand 13 states. [2020-07-21 13:20:06,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:06,985 INFO L93 Difference]: Finished difference Result 129 states and 217 transitions. [2020-07-21 13:20:06,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:20:06,989 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 163 [2020-07-21 13:20:06,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:06,991 INFO L225 Difference]: With dead ends: 129 [2020-07-21 13:20:06,991 INFO L226 Difference]: Without dead ends: 122 [2020-07-21 13:20:06,993 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 305 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 13:20:06,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-07-21 13:20:07,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 93. [2020-07-21 13:20:07,006 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:20:07,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 13:20:07,007 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 163 [2020-07-21 13:20:07,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:07,008 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 13:20:07,008 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:20:07,008 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 13:20:07,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2020-07-21 13:20:07,011 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:07,011 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 9, 6, 6, 6, 6, 6, 6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:07,224 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:07,225 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:07,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:07,226 INFO L82 PathProgramCache]: Analyzing trace with hash -1607241826, now seen corresponding path program 10 times [2020-07-21 13:20:07,226 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:07,227 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2048016544] [2020-07-21 13:20:07,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:07,400 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:07,400 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:07,402 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 13:20:07,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:07,472 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 32 refuted. 0 times theorem prover too weak. 518 trivial. 0 not checked. [2020-07-21 13:20:07,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:07,733 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:07,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:07,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:07,885 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:08,050 INFO L134 CoverageAnalysis]: Checked inductivity of 673 backedges. 123 proven. 34 refuted. 0 times theorem prover too weak. 516 trivial. 0 not checked. [2020-07-21 13:20:08,050 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2048016544] [2020-07-21 13:20:08,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:08,051 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 11 [2020-07-21 13:20:08,051 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760485746] [2020-07-21 13:20:08,051 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 13:20:08,052 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:08,052 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 13:20:08,052 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2020-07-21 13:20:08,052 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 11 states. [2020-07-21 13:20:08,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:08,197 INFO L93 Difference]: Finished difference Result 131 states and 225 transitions. [2020-07-21 13:20:08,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 13:20:08,198 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 164 [2020-07-21 13:20:08,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:08,200 INFO L225 Difference]: With dead ends: 131 [2020-07-21 13:20:08,201 INFO L226 Difference]: Without dead ends: 124 [2020-07-21 13:20:08,202 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 311 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 13:20:08,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-07-21 13:20:08,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 95. [2020-07-21 13:20:08,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-07-21 13:20:08,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 157 transitions. [2020-07-21 13:20:08,212 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 157 transitions. Word has length 164 [2020-07-21 13:20:08,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:08,213 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 157 transitions. [2020-07-21 13:20:08,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 13:20:08,213 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 157 transitions. [2020-07-21 13:20:08,215 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2020-07-21 13:20:08,215 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:08,216 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 9, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:08,429 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:08,430 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:08,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:08,431 INFO L82 PathProgramCache]: Analyzing trace with hash -315995755, now seen corresponding path program 11 times [2020-07-21 13:20:08,431 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:08,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145798969] [2020-07-21 13:20:08,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:08,607 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:08,608 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:08,609 INFO L263 TraceCheckSpWp]: Trace formula consists of 393 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 13:20:08,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:08,687 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 168 proven. 41 refuted. 0 times theorem prover too weak. 568 trivial. 0 not checked. [2020-07-21 13:20:08,688 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:09,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:09,521 INFO L134 CoverageAnalysis]: Checked inductivity of 777 backedges. 170 proven. 43 refuted. 0 times theorem prover too weak. 564 trivial. 0 not checked. [2020-07-21 13:20:09,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145798969] [2020-07-21 13:20:09,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:09,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 13 [2020-07-21 13:20:09,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932756295] [2020-07-21 13:20:09,523 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 13:20:09,523 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:09,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 13:20:09,524 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2020-07-21 13:20:09,524 INFO L87 Difference]: Start difference. First operand 95 states and 157 transitions. Second operand 13 states. [2020-07-21 13:20:09,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:09,708 INFO L93 Difference]: Finished difference Result 110 states and 175 transitions. [2020-07-21 13:20:09,709 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 13:20:09,709 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 176 [2020-07-21 13:20:09,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:09,711 INFO L225 Difference]: With dead ends: 110 [2020-07-21 13:20:09,711 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 13:20:09,713 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 355 GetRequests, 331 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 13:20:09,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 13:20:09,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 93. [2020-07-21 13:20:09,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:20:09,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 149 transitions. [2020-07-21 13:20:09,723 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 149 transitions. Word has length 176 [2020-07-21 13:20:09,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:09,724 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 149 transitions. [2020-07-21 13:20:09,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 13:20:09,724 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 149 transitions. [2020-07-21 13:20:09,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 192 [2020-07-21 13:20:09,727 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:09,727 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 11, 11, 7, 7, 7, 7, 7, 7, 7, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:09,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:09,942 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:09,943 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:09,943 INFO L82 PathProgramCache]: Analyzing trace with hash -854759576, now seen corresponding path program 12 times [2020-07-21 13:20:09,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:09,944 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230797881] [2020-07-21 13:20:09,944 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:10,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:10,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:10,161 INFO L263 TraceCheckSpWp]: Trace formula consists of 426 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 13:20:10,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:10,268 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 45 refuted. 0 times theorem prover too weak. 642 trivial. 0 not checked. [2020-07-21 13:20:10,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:10,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,287 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:11,424 INFO L134 CoverageAnalysis]: Checked inductivity of 938 backedges. 251 proven. 55 refuted. 0 times theorem prover too weak. 632 trivial. 0 not checked. [2020-07-21 13:20:11,425 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230797881] [2020-07-21 13:20:11,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:11,425 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 15 [2020-07-21 13:20:11,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [625776535] [2020-07-21 13:20:11,426 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 13:20:11,426 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:11,427 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 13:20:11,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=165, Unknown=0, NotChecked=0, Total=210 [2020-07-21 13:20:11,427 INFO L87 Difference]: Start difference. First operand 93 states and 149 transitions. Second operand 15 states. [2020-07-21 13:20:11,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:11,659 INFO L93 Difference]: Finished difference Result 123 states and 202 transitions. [2020-07-21 13:20:11,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 13:20:11,661 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 191 [2020-07-21 13:20:11,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:11,663 INFO L225 Difference]: With dead ends: 123 [2020-07-21 13:20:11,663 INFO L226 Difference]: Without dead ends: 116 [2020-07-21 13:20:11,664 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 386 GetRequests, 357 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 13:20:11,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-07-21 13:20:11,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 101. [2020-07-21 13:20:11,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-07-21 13:20:11,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 173 transitions. [2020-07-21 13:20:11,683 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 173 transitions. Word has length 191 [2020-07-21 13:20:11,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:11,683 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 173 transitions. [2020-07-21 13:20:11,683 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 13:20:11,683 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 173 transitions. [2020-07-21 13:20:11,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2020-07-21 13:20:11,686 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:11,686 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 12, 11, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:11,900 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:11,901 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:11,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:11,902 INFO L82 PathProgramCache]: Analyzing trace with hash -31808317, now seen corresponding path program 13 times [2020-07-21 13:20:11,903 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:11,903 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1926464108] [2020-07-21 13:20:11,903 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:12,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:12,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 13:20:12,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 455 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 13:20:12,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 13:20:12,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 100 refuted. 0 times theorem prover too weak. 703 trivial. 0 not checked. [2020-07-21 13:20:12,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 13:20:13,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,344 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,505 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,506 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,594 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 13:20:13,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1073 backedges. 270 proven. 116 refuted. 0 times theorem prover too weak. 687 trivial. 0 not checked. [2020-07-21 13:20:13,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1926464108] [2020-07-21 13:20:13,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 13:20:13,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 17 [2020-07-21 13:20:13,871 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666245368] [2020-07-21 13:20:13,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 13:20:13,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 13:20:13,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 13:20:13,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2020-07-21 13:20:13,873 INFO L87 Difference]: Start difference. First operand 101 states and 173 transitions. Second operand 17 states. [2020-07-21 13:20:14,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 13:20:14,195 INFO L93 Difference]: Finished difference Result 121 states and 205 transitions. [2020-07-21 13:20:14,195 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 13:20:14,196 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 204 [2020-07-21 13:20:14,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 13:20:14,198 INFO L225 Difference]: With dead ends: 121 [2020-07-21 13:20:14,198 INFO L226 Difference]: Without dead ends: 114 [2020-07-21 13:20:14,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 413 GetRequests, 379 SyntacticMatches, 13 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=109, Invalid=397, Unknown=0, NotChecked=0, Total=506 [2020-07-21 13:20:14,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-07-21 13:20:14,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 93. [2020-07-21 13:20:14,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-07-21 13:20:14,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 161 transitions. [2020-07-21 13:20:14,210 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 161 transitions. Word has length 204 [2020-07-21 13:20:14,210 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 13:20:14,210 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 161 transitions. [2020-07-21 13:20:14,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 13:20:14,211 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 161 transitions. [2020-07-21 13:20:14,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2020-07-21 13:20:14,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 13:20:14,213 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 10, 10, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 4, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 13:20:14,428 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:14,429 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 13:20:14,430 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 13:20:14,430 INFO L82 PathProgramCache]: Analyzing trace with hash 307857833, now seen corresponding path program 14 times [2020-07-21 13:20:14,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 13:20:14,431 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [833447250] [2020-07-21 13:20:14,431 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:14,619 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 13:20:14,620 INFO L229 tOrderPrioritization]: Conjunction of SSA is sat [2020-07-21 13:20:14,620 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:20:14,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-21 13:20:14,657 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-21 13:20:14,700 INFO L174 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-07-21 13:20:14,701 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-21 13:20:14,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 13:20:14,976 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:20:14 BoogieIcfgContainer [2020-07-21 13:20:14,976 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 13:20:14,979 INFO L168 Benchmark]: Toolchain (without parser) took 40303.37 ms. Allocated memory was 145.2 MB in the beginning and 534.2 MB in the end (delta: 389.0 MB). Free memory was 103.4 MB in the beginning and 372.1 MB in the end (delta: -268.8 MB). Peak memory consumption was 120.3 MB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,979 INFO L168 Benchmark]: CDTParser took 0.53 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,980 INFO L168 Benchmark]: CACSL2BoogieTranslator took 311.43 ms. Allocated memory is still 145.2 MB. Free memory was 102.9 MB in the beginning and 93.0 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,980 INFO L168 Benchmark]: Boogie Preprocessor took 130.22 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 93.0 MB in the beginning and 180.6 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,981 INFO L168 Benchmark]: RCFGBuilder took 341.91 ms. Allocated memory is still 201.9 MB. Free memory was 180.6 MB in the beginning and 167.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,981 INFO L168 Benchmark]: TraceAbstraction took 39489.72 ms. Allocated memory was 201.9 MB in the beginning and 534.2 MB in the end (delta: 332.4 MB). Free memory was 166.9 MB in the beginning and 372.1 MB in the end (delta: -205.2 MB). Peak memory consumption was 127.2 MB. Max. memory is 7.1 GB. [2020-07-21 13:20:14,984 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.53 ms. Allocated memory is still 145.2 MB. Free memory was 121.4 MB in the beginning and 121.2 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 311.43 ms. Allocated memory is still 145.2 MB. Free memory was 102.9 MB in the beginning and 93.0 MB in the end (delta: 9.9 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 130.22 ms. Allocated memory was 145.2 MB in the beginning and 201.9 MB in the end (delta: 56.6 MB). Free memory was 93.0 MB in the beginning and 180.6 MB in the end (delta: -87.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * RCFGBuilder took 341.91 ms. Allocated memory is still 201.9 MB. Free memory was 180.6 MB in the beginning and 167.6 MB in the end (delta: 13.0 MB). Peak memory consumption was 13.0 MB. Max. memory is 7.1 GB. * TraceAbstraction took 39489.72 ms. Allocated memory was 201.9 MB in the beginning and 534.2 MB in the end (delta: 332.4 MB). Free memory was 166.9 MB in the beginning and 372.1 MB in the end (delta: -205.2 MB). Peak memory consumption was 127.2 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 39]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L36] int x = 6; VAL [x=6] [L37] CALL, EXPR fibo1(x) VAL [\old(n)=6] [L8] COND FALSE !(n < 1) VAL [\old(n)=6, n=6] [L10] COND FALSE !(n == 1) VAL [\old(n)=6, n=6] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=5] [L18] COND FALSE !(n < 1) VAL [\old(n)=5, n=5] [L20] COND FALSE !(n == 1) VAL [\old(n)=5, n=5] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=4] [L8] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L10] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L18] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L20] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=5, fibo1(n-1)=3, n=5] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=5, fibo1(n-1)=3, fibo1(n-2)=2, n=5] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=6, fibo2(n-1)=5, n=6] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=4] [L18] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L20] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=3] [L8] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L10] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=2] [L18] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L20] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L23] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L8] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L10] COND TRUE n == 1 [L11] return 1; VAL [\old(n)=1, \result=1, n=1] [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L8] COND TRUE n < 1 [L9] return 0; VAL [\old(n)=0, \result=0, n=0] [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=3, fibo2(n-1)=1, n=3] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=3, fibo2(n-1)=1, fibo2(n-2)=1, n=3] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-1) VAL [\old(n)=4, fibo1(n-1)=2, n=4] [L23] CALL, EXPR fibo1(n-2) VAL [\old(n)=2] [L8] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L10] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L13] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L18] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L20] COND TRUE n == 1 [L21] return 1; VAL [\old(n)=1, \result=1, n=1] [L13] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L13] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L18] COND TRUE n < 1 [L19] return 0; VAL [\old(n)=0, \result=0, n=0] [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L13] return fibo2(n-1) + fibo2(n-2); [L23] RET, EXPR fibo1(n-2) VAL [\old(n)=4, fibo1(n-1)=2, fibo1(n-2)=1, n=4] [L23] return fibo1(n-1) + fibo1(n-2); [L13] RET, EXPR fibo2(n-2) VAL [\old(n)=6, fibo2(n-1)=5, fibo2(n-2)=3, n=6] [L13] return fibo2(n-1) + fibo2(n-2); [L37] RET, EXPR fibo1(x) VAL [fibo1(x)=8, x=6] [L37] int result = fibo1(x); [L38] COND TRUE result == 8 VAL [result=8, x=6] [L39] __VERIFIER_error() VAL [result=8, x=6] - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 33 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 39.3s, OverallIterations: 27, TraceHistogramMax: 18, AutomataDifference: 5.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 635 SDtfs, 1042 SDslu, 3546 SDs, 0 SdLazy, 3607 SolverSat, 849 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6247 GetRequests, 5623 SyntacticMatches, 225 SemanticMatches, 399 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1101 ImplicationChecksByTransitivity, 5.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=101occurred in iteration=25, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.3s AutomataMinimizationTime, 26 MinimizatonAttempts, 424 StatesRemovedByMinimization, 23 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 0.9s SatisfiabilityAnalysisTime, 23.8s InterpolantComputationTime, 3264 NumberOfCodeBlocks, 3264 NumberOfCodeBlocksAsserted, 54 NumberOfCheckSat, 6097 ConstructedInterpolants, 0 QuantifiedInterpolants, 1531967 SizeOfPredicates, 132 NumberOfNonLiveVariables, 6913 ConjunctsInSsa, 264 ConjunctsInUnsatCore, 50 InterpolantComputations, 2 PerfectInterpolantSequences, 19515/23532 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...