/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_VARIABLES --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/bitvector/gcd_4.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 15:44:53,317 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 15:44:53,319 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 15:44:53,331 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 15:44:53,332 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 15:44:53,333 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 15:44:53,334 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 15:44:53,336 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 15:44:53,338 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 15:44:53,339 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 15:44:53,340 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 15:44:53,341 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 15:44:53,341 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 15:44:53,342 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 15:44:53,343 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 15:44:53,344 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 15:44:53,345 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 15:44:53,346 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 15:44:53,347 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 15:44:53,352 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 15:44:53,357 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 15:44:53,358 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 15:44:53,359 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 15:44:53,360 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 15:44:53,362 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 15:44:53,370 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 15:44:53,370 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 15:44:53,371 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 15:44:53,372 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 15:44:53,386 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 15:44:53,386 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 15:44:53,387 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 15:44:53,387 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 15:44:53,387 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 15:44:53,388 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 15:44:53,388 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 15:44:53,388 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 15:44:53,388 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 15:44:53,388 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 15:44:53,388 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 15:44:53,389 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 15:44:53,389 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 15:44:53,389 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 15:44:53,389 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 15:44:53,389 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 15:44:53,390 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 15:44:53,390 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 15:44:53,390 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 15:44:53,390 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 15:44:53,390 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 15:44:53,391 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:44:53,391 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 15:44:53,391 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 15:44:53,391 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 15:44:53,391 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 15:44:53,392 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:53,392 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 15:44:53,392 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 15:44:53,392 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_VARIABLES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 15:44:53,689 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 15:44:53,702 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 15:44:53,706 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 15:44:53,708 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 15:44:53,708 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 15:44:53,709 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 15:44:53,783 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c471081a5/b75080ec4a7d4242bd094c6d34767960/FLAG3518d2273 [2020-07-21 15:44:54,204 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 15:44:54,205 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/bitvector/gcd_4.c [2020-07-21 15:44:54,213 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c471081a5/b75080ec4a7d4242bd094c6d34767960/FLAG3518d2273 [2020-07-21 15:44:54,598 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c471081a5/b75080ec4a7d4242bd094c6d34767960 [2020-07-21 15:44:54,608 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 15:44:54,612 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 15:44:54,617 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 15:44:54,617 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 15:44:54,620 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 15:44:54,621 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,624 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@793f9d50 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54, skipping insertion in model container [2020-07-21 15:44:54,624 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,632 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 15:44:54,653 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 15:44:54,830 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:44:54,833 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 15:44:54,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 15:44:54,865 INFO L208 MainTranslator]: Completed translation [2020-07-21 15:44:54,866 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54 WrapperNode [2020-07-21 15:44:54,866 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 15:44:54,867 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 15:44:54,867 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 15:44:54,867 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 15:44:54,880 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,880 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,885 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,886 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,890 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,976 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,977 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... [2020-07-21 15:44:54,981 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 15:44:54,981 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 15:44:54,982 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 15:44:54,982 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 15:44:54,982 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 15:44:55,035 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 15:44:55,036 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 15:44:55,036 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 15:44:55,036 INFO L138 BoogieDeclarations]: Found implementation of procedure gcd_test [2020-07-21 15:44:55,036 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 15:44:55,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 15:44:55,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 15:44:55,036 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 15:44:55,037 INFO L130 BoogieDeclarations]: Found specification of procedure gcd_test [2020-07-21 15:44:55,037 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 15:44:55,037 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 15:44:55,037 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 15:44:55,286 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 15:44:55,287 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 15:44:55,296 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:44:55 BoogieIcfgContainer [2020-07-21 15:44:55,296 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 15:44:55,298 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 15:44:55,298 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 15:44:55,306 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 15:44:55,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 03:44:54" (1/3) ... [2020-07-21 15:44:55,307 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a8e38bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:44:55, skipping insertion in model container [2020-07-21 15:44:55,307 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 03:44:54" (2/3) ... [2020-07-21 15:44:55,308 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3a8e38bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 03:44:55, skipping insertion in model container [2020-07-21 15:44:55,308 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 03:44:55" (3/3) ... [2020-07-21 15:44:55,310 INFO L109 eAbstractionObserver]: Analyzing ICFG gcd_4.c [2020-07-21 15:44:55,320 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 15:44:55,329 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 15:44:55,342 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 15:44:55,366 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 15:44:55,366 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 15:44:55,366 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 15:44:55,366 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 15:44:55,366 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 15:44:55,366 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 15:44:55,367 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 15:44:55,367 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 15:44:55,385 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2020-07-21 15:44:55,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 15:44:55,391 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:55,392 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:55,393 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:55,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:55,399 INFO L82 PathProgramCache]: Analyzing trace with hash 876608673, now seen corresponding path program 1 times [2020-07-21 15:44:55,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:55,406 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1237017904] [2020-07-21 15:44:55,406 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:55,480 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:55,481 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:55,483 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:44:55,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:55,574 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:55,574 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:44:55,575 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1237017904] [2020-07-21 15:44:55,576 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:44:55,576 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:44:55,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55999933] [2020-07-21 15:44:55,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:44:55,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:55,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:44:55,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:44:55,594 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 5 states. [2020-07-21 15:44:55,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:55,713 INFO L93 Difference]: Finished difference Result 60 states and 81 transitions. [2020-07-21 15:44:55,714 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:44:55,715 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 15:44:55,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:55,724 INFO L225 Difference]: With dead ends: 60 [2020-07-21 15:44:55,725 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:44:55,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:44:55,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:44:55,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 15:44:55,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 15:44:55,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 30 transitions. [2020-07-21 15:44:55,777 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 30 transitions. Word has length 17 [2020-07-21 15:44:55,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:55,777 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 30 transitions. [2020-07-21 15:44:55,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:44:55,778 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 30 transitions. [2020-07-21 15:44:55,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-07-21 15:44:55,780 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:55,780 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:55,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:55,994 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:55,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:55,994 INFO L82 PathProgramCache]: Analyzing trace with hash 483581663, now seen corresponding path program 1 times [2020-07-21 15:44:55,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:55,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1521112965] [2020-07-21 15:44:55,995 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:56,035 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:56,035 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:56,037 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:44:56,039 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:56,074 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:56,075 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:44:56,075 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1521112965] [2020-07-21 15:44:56,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:44:56,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:44:56,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486560693] [2020-07-21 15:44:56,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:44:56,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:56,078 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:44:56,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:44:56,079 INFO L87 Difference]: Start difference. First operand 25 states and 30 transitions. Second operand 5 states. [2020-07-21 15:44:56,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:56,144 INFO L93 Difference]: Finished difference Result 42 states and 50 transitions. [2020-07-21 15:44:56,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:44:56,145 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-07-21 15:44:56,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:56,147 INFO L225 Difference]: With dead ends: 42 [2020-07-21 15:44:56,147 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:44:56,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:44:56,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:44:56,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 15:44:56,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 15:44:56,160 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-07-21 15:44:56,160 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 17 [2020-07-21 15:44:56,161 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:56,162 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-07-21 15:44:56,162 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:44:56,163 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-07-21 15:44:56,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 15:44:56,165 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:56,166 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:56,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:56,380 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:56,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:56,381 INFO L82 PathProgramCache]: Analyzing trace with hash -1158269966, now seen corresponding path program 1 times [2020-07-21 15:44:56,382 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:56,383 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1282264651] [2020-07-21 15:44:56,384 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:56,412 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:56,413 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:56,414 INFO L263 TraceCheckSpWp]: Trace formula consists of 36 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:44:56,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:56,452 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:56,452 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:44:56,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1282264651] [2020-07-21 15:44:56,453 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:44:56,453 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:44:56,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [935378271] [2020-07-21 15:44:56,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:44:56,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:56,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:44:56,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:44:56,455 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-07-21 15:44:56,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:56,540 INFO L93 Difference]: Finished difference Result 46 states and 55 transitions. [2020-07-21 15:44:56,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:44:56,541 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 15:44:56,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:56,542 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:44:56,542 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 15:44:56,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:44:56,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 15:44:56,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 25. [2020-07-21 15:44:56,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-07-21 15:44:56,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-07-21 15:44:56,555 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 19 [2020-07-21 15:44:56,555 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:56,556 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-07-21 15:44:56,556 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:44:56,556 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-07-21 15:44:56,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 15:44:56,557 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:56,557 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:56,772 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:56,773 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:56,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:56,774 INFO L82 PathProgramCache]: Analyzing trace with hash -457205388, now seen corresponding path program 1 times [2020-07-21 15:44:56,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:56,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838343946] [2020-07-21 15:44:56,776 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:56,803 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:44:56,804 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:56,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 15:44:56,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:56,833 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:56,833 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:44:56,834 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838343946] [2020-07-21 15:44:56,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:44:56,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 15:44:56,835 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854274908] [2020-07-21 15:44:56,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:44:56,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:56,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:44:56,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 15:44:56,836 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 5 states. [2020-07-21 15:44:56,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:56,888 INFO L93 Difference]: Finished difference Result 40 states and 46 transitions. [2020-07-21 15:44:56,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:44:56,889 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 19 [2020-07-21 15:44:56,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:56,890 INFO L225 Difference]: With dead ends: 40 [2020-07-21 15:44:56,890 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 15:44:56,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 15:44:56,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 15:44:56,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 15:44:56,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 15:44:56,897 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-07-21 15:44:56,897 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 19 [2020-07-21 15:44:56,898 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:56,898 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-07-21 15:44:56,898 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:44:56,898 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-07-21 15:44:56,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 15:44:56,899 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:56,899 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:57,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:57,103 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:57,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:57,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1431348209, now seen corresponding path program 1 times [2020-07-21 15:44:57,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:57,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641898328] [2020-07-21 15:44:57,105 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:57,149 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:57,149 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:57,150 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-21 15:44:57,152 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:57,184 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:57,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:44:57,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:57,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641898328] [2020-07-21 15:44:57,273 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:44:57,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [5] total 7 [2020-07-21 15:44:57,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1368702165] [2020-07-21 15:44:57,274 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 15:44:57,274 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:57,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 15:44:57,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 15:44:57,275 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-07-21 15:44:57,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:57,328 INFO L93 Difference]: Finished difference Result 44 states and 52 transitions. [2020-07-21 15:44:57,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 15:44:57,329 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 21 [2020-07-21 15:44:57,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:57,330 INFO L225 Difference]: With dead ends: 44 [2020-07-21 15:44:57,330 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 15:44:57,331 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-07-21 15:44:57,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 15:44:57,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 15:44:57,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 15:44:57,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 15:44:57,342 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 21 [2020-07-21 15:44:57,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:57,342 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 15:44:57,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 15:44:57,342 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 15:44:57,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 15:44:57,343 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:57,343 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:57,558 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:57,559 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:57,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:57,560 INFO L82 PathProgramCache]: Analyzing trace with hash -1537894100, now seen corresponding path program 1 times [2020-07-21 15:44:57,560 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:57,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1406763530] [2020-07-21 15:44:57,561 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:57,582 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:57,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:57,583 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 15:44:57,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:57,653 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:57,653 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:44:57,787 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:57,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1406763530] [2020-07-21 15:44:57,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:44:57,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 9 [2020-07-21 15:44:57,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1949791298] [2020-07-21 15:44:57,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 15:44:57,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:57,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 15:44:57,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-07-21 15:44:57,790 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-07-21 15:44:57,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:57,882 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2020-07-21 15:44:57,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:44:57,883 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2020-07-21 15:44:57,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:57,884 INFO L225 Difference]: With dead ends: 46 [2020-07-21 15:44:57,884 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 15:44:57,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 15:44:57,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 15:44:57,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2020-07-21 15:44:57,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 15:44:57,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-07-21 15:44:57,891 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 23 [2020-07-21 15:44:57,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:57,891 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-07-21 15:44:57,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 15:44:57,891 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-07-21 15:44:57,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 15:44:57,892 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:57,892 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:58,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:58,093 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:58,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:58,094 INFO L82 PathProgramCache]: Analyzing trace with hash -849280247, now seen corresponding path program 2 times [2020-07-21 15:44:58,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:58,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [277987837] [2020-07-21 15:44:58,096 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:58,120 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:44:58,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:58,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 15:44:58,123 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:44:58,212 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:44:58,212 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:44:58,311 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [277987837] [2020-07-21 15:44:58,311 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:44:58,311 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-07-21 15:44:58,311 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [837678501] [2020-07-21 15:44:58,312 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 15:44:58,312 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:44:58,312 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 15:44:58,313 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-07-21 15:44:58,313 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 7 states. [2020-07-21 15:44:58,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:44:58,427 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-07-21 15:44:58,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 15:44:58,429 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2020-07-21 15:44:58,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:44:58,430 INFO L225 Difference]: With dead ends: 48 [2020-07-21 15:44:58,430 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 15:44:58,431 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:44:58,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 15:44:58,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 15:44:58,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 15:44:58,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-07-21 15:44:58,436 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 25 [2020-07-21 15:44:58,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:44:58,437 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-07-21 15:44:58,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 15:44:58,437 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-07-21 15:44:58,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 15:44:58,438 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:44:58,438 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:44:58,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:58,647 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:44:58,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:44:58,648 INFO L82 PathProgramCache]: Analyzing trace with hash -516331098, now seen corresponding path program 3 times [2020-07-21 15:44:58,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:44:58,649 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1757669672] [2020-07-21 15:44:58,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:44:58,682 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:44:58,682 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:44:58,684 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 15:44:58,686 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:00,884 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:45:00,885 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:03,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1757669672] [2020-07-21 15:45:03,048 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:45:03,048 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 15:45:03,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425410499] [2020-07-21 15:45:03,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 15:45:03,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:03,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 15:45:03,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=70, Unknown=2, NotChecked=0, Total=90 [2020-07-21 15:45:03,050 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-07-21 15:45:23,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:23,646 INFO L93 Difference]: Finished difference Result 52 states and 62 transitions. [2020-07-21 15:45:23,649 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:45:23,649 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 15:45:23,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:23,650 INFO L225 Difference]: With dead ends: 52 [2020-07-21 15:45:23,650 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 15:45:23,651 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=26, Invalid=104, Unknown=2, NotChecked=0, Total=132 [2020-07-21 15:45:23,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 15:45:23,655 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 15:45:23,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 15:45:23,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-07-21 15:45:23,657 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 27 [2020-07-21 15:45:23,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:23,657 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-07-21 15:45:23,657 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 15:45:23,657 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-07-21 15:45:23,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 15:45:23,658 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:23,659 INFO L422 BasicCegarLoop]: trace histogram [5, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:23,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:23,860 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:23,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:23,861 INFO L82 PathProgramCache]: Analyzing trace with hash 1878386625, now seen corresponding path program 4 times [2020-07-21 15:45:23,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:23,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1795519752] [2020-07-21 15:45:23,862 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:23,901 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:45:23,901 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:23,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 15:45:23,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:24,096 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:45:24,097 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:24,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,143 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,144 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:24,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 15:45:27,296 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 15:45:27,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1795519752] [2020-07-21 15:45:27,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 15:45:27,297 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 20 [2020-07-21 15:45:27,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500525868] [2020-07-21 15:45:27,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:45:27,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:27,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:45:27,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=335, Unknown=0, NotChecked=0, Total=380 [2020-07-21 15:45:27,299 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 20 states. [2020-07-21 15:45:39,244 WARN L193 SmtUtils]: Spent 5.41 s on a formula simplification that was a NOOP. DAG size: 33 [2020-07-21 15:45:49,289 WARN L193 SmtUtils]: Spent 7.79 s on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 15:45:52,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:45:52,222 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-07-21 15:45:52,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:45:52,227 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 29 [2020-07-21 15:45:52,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:45:52,228 INFO L225 Difference]: With dead ends: 52 [2020-07-21 15:45:52,228 INFO L226 Difference]: Without dead ends: 39 [2020-07-21 15:45:52,230 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=83, Invalid=567, Unknown=0, NotChecked=0, Total=650 [2020-07-21 15:45:52,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-21 15:45:52,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-21 15:45:52,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-21 15:45:52,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 45 transitions. [2020-07-21 15:45:52,238 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 45 transitions. Word has length 29 [2020-07-21 15:45:52,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:45:52,238 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 45 transitions. [2020-07-21 15:45:52,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:45:52,239 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 45 transitions. [2020-07-21 15:45:52,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 15:45:52,239 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:45:52,240 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:45:52,452 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:52,453 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:45:52,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:45:52,453 INFO L82 PathProgramCache]: Analyzing trace with hash 841482334, now seen corresponding path program 5 times [2020-07-21 15:45:52,453 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:45:52,454 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511289238] [2020-07-21 15:45:52,454 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:45:52,476 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:45:52,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:45:52,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 15:45:52,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:45:52,796 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 15:45:52,796 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:45:53,022 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511289238] [2020-07-21 15:45:53,022 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:45:53,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-07-21 15:45:53,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1781458114] [2020-07-21 15:45:53,023 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 15:45:53,023 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:45:53,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 15:45:53,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-07-21 15:45:53,024 INFO L87 Difference]: Start difference. First operand 39 states and 45 transitions. Second operand 9 states. [2020-07-21 15:46:03,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:03,591 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2020-07-21 15:46:03,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 15:46:03,596 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 31 [2020-07-21 15:46:03,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:03,597 INFO L225 Difference]: With dead ends: 54 [2020-07-21 15:46:03,597 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 15:46:03,598 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=22, Invalid=87, Unknown=1, NotChecked=0, Total=110 [2020-07-21 15:46:03,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 15:46:03,602 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-07-21 15:46:03,602 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-07-21 15:46:03,603 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-07-21 15:46:03,603 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 31 [2020-07-21 15:46:03,603 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:03,603 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-07-21 15:46:03,604 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 15:46:03,604 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-07-21 15:46:03,604 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 15:46:03,605 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:03,605 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:03,807 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:03,808 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:03,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:03,809 INFO L82 PathProgramCache]: Analyzing trace with hash 1492674782, now seen corresponding path program 6 times [2020-07-21 15:46:03,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:03,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73428121] [2020-07-21 15:46:03,810 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:03,839 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 15:46:03,839 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:03,840 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 15:46:03,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:03,851 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-07-21 15:46:03,852 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 15:46:03,852 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73428121] [2020-07-21 15:46:03,852 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 15:46:03,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 15:46:03,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1669106670] [2020-07-21 15:46:03,853 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 15:46:03,853 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:03,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 15:46:03,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 15:46:03,853 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 3 states. [2020-07-21 15:46:03,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:03,872 INFO L93 Difference]: Finished difference Result 51 states and 57 transitions. [2020-07-21 15:46:03,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 15:46:03,875 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 15:46:03,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:03,876 INFO L225 Difference]: With dead ends: 51 [2020-07-21 15:46:03,876 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 15:46:03,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 15:46:03,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 15:46:03,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-07-21 15:46:03,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-07-21 15:46:03,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 42 transitions. [2020-07-21 15:46:03,882 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 42 transitions. Word has length 31 [2020-07-21 15:46:03,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:03,883 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 42 transitions. [2020-07-21 15:46:03,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 15:46:03,883 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 42 transitions. [2020-07-21 15:46:03,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-07-21 15:46:03,884 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:03,884 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:04,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:04,091 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:04,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:04,092 INFO L82 PathProgramCache]: Analyzing trace with hash -202245895, now seen corresponding path program 7 times [2020-07-21 15:46:04,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:04,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137943099] [2020-07-21 15:46:04,093 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:04,119 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:04,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:04,120 INFO L263 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-21 15:46:04,121 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:06,644 WARN L860 $PredicateComparison]: unable to prove that (exists ((v_gcd_test_~a_86 Int)) (and (<= (div (+ (* |c_gcd_test_#in~a| (- 1)) v_gcd_test_~a_86) (- 3)) |c_gcd_test_#in~b|) (<= (+ (div (* v_gcd_test_~a_86 (- 1)) (- 2)) (* 2 v_gcd_test_~a_86)) |c_gcd_test_#in~b|))) is different from true [2020-07-21 15:46:06,681 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 7 not checked. [2020-07-21 15:46:06,682 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:07,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137943099] [2020-07-21 15:46:07,068 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:46:07,068 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-07-21 15:46:07,068 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [964649242] [2020-07-21 15:46:07,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 15:46:07,069 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:07,069 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 15:46:07,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=91, Unknown=1, NotChecked=18, Total=132 [2020-07-21 15:46:07,069 INFO L87 Difference]: Start difference. First operand 38 states and 42 transitions. Second operand 11 states. [2020-07-21 15:46:12,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:12,321 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-21 15:46:12,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 15:46:12,325 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-07-21 15:46:12,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:12,326 INFO L225 Difference]: With dead ends: 57 [2020-07-21 15:46:12,327 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 15:46:12,328 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=44, Invalid=167, Unknown=3, NotChecked=26, Total=240 [2020-07-21 15:46:12,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 15:46:12,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2020-07-21 15:46:12,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 15:46:12,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-21 15:46:12,334 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 33 [2020-07-21 15:46:12,334 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:12,335 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-21 15:46:12,335 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 15:46:12,335 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-21 15:46:12,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-07-21 15:46:12,336 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:12,336 INFO L422 BasicCegarLoop]: trace histogram [8, 5, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:12,541 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:12,541 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:12,542 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:12,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1486576746, now seen corresponding path program 8 times [2020-07-21 15:46:12,542 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:12,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2014106168] [2020-07-21 15:46:12,544 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:12,566 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:12,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:12,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 15:46:12,568 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:15,626 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:46:15,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:16,227 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2014106168] [2020-07-21 15:46:16,227 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:46:16,227 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-07-21 15:46:16,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [741978450] [2020-07-21 15:46:16,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 15:46:16,228 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:16,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 15:46:16,229 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=131, Unknown=1, NotChecked=0, Total=156 [2020-07-21 15:46:16,229 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 12 states. [2020-07-21 15:46:29,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:29,806 INFO L93 Difference]: Finished difference Result 60 states and 70 transitions. [2020-07-21 15:46:29,815 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 15:46:29,815 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 35 [2020-07-21 15:46:29,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:29,816 INFO L225 Difference]: With dead ends: 60 [2020-07-21 15:46:29,816 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 15:46:29,817 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=52, Invalid=252, Unknown=2, NotChecked=0, Total=306 [2020-07-21 15:46:29,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 15:46:29,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-21 15:46:29,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-21 15:46:29,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2020-07-21 15:46:29,827 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2020-07-21 15:46:29,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:29,827 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2020-07-21 15:46:29,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 15:46:29,827 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2020-07-21 15:46:29,828 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-21 15:46:29,828 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:29,828 INFO L422 BasicCegarLoop]: trace histogram [9, 6, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:30,043 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:30,044 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:30,044 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:30,044 INFO L82 PathProgramCache]: Analyzing trace with hash 1222056691, now seen corresponding path program 9 times [2020-07-21 15:46:30,045 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:30,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22649805] [2020-07-21 15:46:30,045 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:30,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:30,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:30,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 15:46:30,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:35,442 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:46:35,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:35,825 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:46:35,940 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 15:46:36,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22649805] [2020-07-21 15:46:36,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:46:36,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-07-21 15:46:36,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396514300] [2020-07-21 15:46:36,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 15:46:36,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:36,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 15:46:36,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=154, Unknown=2, NotChecked=0, Total=182 [2020-07-21 15:46:36,482 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2020-07-21 15:46:47,448 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 28 [2020-07-21 15:46:47,857 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 26 [2020-07-21 15:46:52,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:46:52,659 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2020-07-21 15:46:52,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 15:46:52,669 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 37 [2020-07-21 15:46:52,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:46:52,669 INFO L225 Difference]: With dead ends: 60 [2020-07-21 15:46:52,669 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 15:46:52,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=62, Invalid=314, Unknown=4, NotChecked=0, Total=380 [2020-07-21 15:46:52,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 15:46:52,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 15:46:52,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 15:46:52,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2020-07-21 15:46:52,677 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 37 [2020-07-21 15:46:52,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:46:52,678 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2020-07-21 15:46:52,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 15:46:52,678 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2020-07-21 15:46:52,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 15:46:52,679 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:46:52,679 INFO L422 BasicCegarLoop]: trace histogram [10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:46:52,892 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:52,893 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:46:52,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:46:52,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1468608272, now seen corresponding path program 10 times [2020-07-21 15:46:52,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:46:52,895 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1218592488] [2020-07-21 15:46:52,895 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:46:52,927 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:46:52,927 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:46:52,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 15:46:52,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:46:58,732 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:46:58,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:46:59,343 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:46:59,742 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1218592488] [2020-07-21 15:46:59,742 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:46:59,743 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-07-21 15:46:59,743 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103699110] [2020-07-21 15:46:59,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 15:46:59,744 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:46:59,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 15:46:59,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=181, Unknown=1, NotChecked=0, Total=210 [2020-07-21 15:46:59,745 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 14 states. [2020-07-21 15:47:11,194 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 28 [2020-07-21 15:47:11,690 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 37 DAG size of output: 26 [2020-07-21 15:47:14,088 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 27 [2020-07-21 15:47:21,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:47:21,297 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2020-07-21 15:47:21,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 15:47:21,312 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-07-21 15:47:21,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:47:21,313 INFO L225 Difference]: With dead ends: 62 [2020-07-21 15:47:21,313 INFO L226 Difference]: Without dead ends: 46 [2020-07-21 15:47:21,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 12.1s TimeCoverageRelationStatistics Valid=74, Invalid=385, Unknown=3, NotChecked=0, Total=462 [2020-07-21 15:47:21,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-07-21 15:47:21,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-07-21 15:47:21,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 15:47:21,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2020-07-21 15:47:21,322 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 39 [2020-07-21 15:47:21,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:47:21,323 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2020-07-21 15:47:21,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 15:47:21,324 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2020-07-21 15:47:21,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 15:47:21,325 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:47:21,325 INFO L422 BasicCegarLoop]: trace histogram [11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:47:21,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:21,527 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:47:21,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:47:21,528 INFO L82 PathProgramCache]: Analyzing trace with hash -2113490963, now seen corresponding path program 11 times [2020-07-21 15:47:21,528 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:47:21,529 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1227258928] [2020-07-21 15:47:21,530 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:47:21,563 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:47:21,563 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:47:21,564 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-21 15:47:21,565 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:47:27,430 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:47:27,430 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:47:27,708 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 15:47:27,812 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 15:47:27,928 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:47:28,093 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 15:47:28,225 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:47:28,351 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 15:47:28,472 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 15:47:29,059 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1227258928] [2020-07-21 15:47:29,059 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:47:29,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-07-21 15:47:29,060 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1546042196] [2020-07-21 15:47:29,060 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 15:47:29,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:47:29,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 15:47:29,061 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=209, Unknown=1, NotChecked=0, Total=240 [2020-07-21 15:47:29,061 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 15 states. [2020-07-21 15:47:45,441 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 28 [2020-07-21 15:47:46,240 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 43 DAG size of output: 26 [2020-07-21 15:47:48,770 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 27 [2020-07-21 15:47:53,339 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:48:13,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:48:13,803 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2020-07-21 15:48:13,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 15:48:13,824 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 41 [2020-07-21 15:48:13,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:48:13,824 INFO L225 Difference]: With dead ends: 64 [2020-07-21 15:48:13,825 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 15:48:13,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=88, Invalid=460, Unknown=4, NotChecked=0, Total=552 [2020-07-21 15:48:13,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 15:48:13,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 15:48:13,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 15:48:13,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-21 15:48:13,833 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 41 [2020-07-21 15:48:13,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:48:13,834 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-21 15:48:13,834 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 15:48:13,834 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-21 15:48:13,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 15:48:13,835 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:48:13,835 INFO L422 BasicCegarLoop]: trace histogram [12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:48:14,049 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:48:14,051 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:48:14,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:48:14,052 INFO L82 PathProgramCache]: Analyzing trace with hash 52915594, now seen corresponding path program 12 times [2020-07-21 15:48:14,052 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:48:14,053 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1222270284] [2020-07-21 15:48:14,053 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:48:14,089 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:48:14,089 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:48:14,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 15:48:14,095 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:48:52,474 WARN L193 SmtUtils]: Spent 2.05 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-21 15:48:52,521 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:48:52,521 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:48:52,685 WARN L193 SmtUtils]: Spent 162.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:48:52,850 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 15:48:53,044 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:48:53,233 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:48:53,421 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:48:53,771 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:48:54,101 WARN L193 SmtUtils]: Spent 326.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 15:48:54,393 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 15:48:54,671 WARN L193 SmtUtils]: Spent 274.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:48:54,928 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 15:48:57,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1222270284] [2020-07-21 15:48:57,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:48:57,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-07-21 15:48:57,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [536012931] [2020-07-21 15:48:57,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 15:48:57,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:48:57,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 15:48:57,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=223, Unknown=17, NotChecked=0, Total=272 [2020-07-21 15:48:57,538 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 16 states. [2020-07-21 15:49:09,104 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:49:26,328 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:49:40,566 WARN L193 SmtUtils]: Spent 400.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 28 [2020-07-21 15:49:47,561 WARN L193 SmtUtils]: Spent 383.00 ms on a formula simplification. DAG size of input: 49 DAG size of output: 26 [2020-07-21 15:49:56,698 WARN L193 SmtUtils]: Spent 374.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 27 [2020-07-21 15:50:07,905 WARN L193 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:50:12,899 WARN L193 SmtUtils]: Spent 325.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:50:17,978 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 15:50:25,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:50:25,154 INFO L93 Difference]: Finished difference Result 66 states and 73 transitions. [2020-07-21 15:50:25,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-21 15:50:25,178 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 43 [2020-07-21 15:50:25,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:50:25,180 INFO L225 Difference]: With dead ends: 66 [2020-07-21 15:50:25,180 INFO L226 Difference]: Without dead ends: 50 [2020-07-21 15:50:25,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 67.9s TimeCoverageRelationStatistics Valid=104, Invalid=519, Unknown=27, NotChecked=0, Total=650 [2020-07-21 15:50:25,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-07-21 15:50:25,189 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2020-07-21 15:50:25,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 15:50:25,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2020-07-21 15:50:25,190 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 43 [2020-07-21 15:50:25,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:50:25,191 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2020-07-21 15:50:25,191 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 15:50:25,191 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2020-07-21 15:50:25,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-07-21 15:50:25,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:50:25,192 INFO L422 BasicCegarLoop]: trace histogram [13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:50:25,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:25,408 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:50:25,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:50:25,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1089521689, now seen corresponding path program 13 times [2020-07-21 15:50:25,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:50:25,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430783004] [2020-07-21 15:50:25,410 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:50:25,445 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:50:25,446 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:50:25,447 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-21 15:50:25,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:50:26,268 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:50:26,645 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 15:50:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:50:35,655 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:50:35,915 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 15:50:36,163 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 15:50:36,428 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:50:36,637 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:50:36,854 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:50:37,231 WARN L193 SmtUtils]: Spent 373.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 15:50:37,564 WARN L193 SmtUtils]: Spent 329.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:50:37,880 WARN L193 SmtUtils]: Spent 311.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:50:38,189 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:50:38,477 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 15:50:38,704 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 15:50:39,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430783004] [2020-07-21 15:50:39,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:50:39,675 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-07-21 15:50:39,675 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1809669758] [2020-07-21 15:50:39,676 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 15:50:39,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:50:39,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 15:50:39,677 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=271, Unknown=1, NotChecked=0, Total=306 [2020-07-21 15:50:39,677 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand 17 states. [2020-07-21 15:50:48,629 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:50:57,300 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:51:00,422 WARN L193 SmtUtils]: Spent 404.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 28 [2020-07-21 15:51:04,230 WARN L193 SmtUtils]: Spent 527.00 ms on a formula simplification. DAG size of input: 55 DAG size of output: 26 [2020-07-21 15:51:05,596 WARN L193 SmtUtils]: Spent 483.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 27 [2020-07-21 15:51:08,816 WARN L193 SmtUtils]: Spent 427.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 15:51:10,143 WARN L193 SmtUtils]: Spent 445.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:51:13,349 WARN L193 SmtUtils]: Spent 405.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:51:17,335 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 15:51:24,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:51:24,318 INFO L93 Difference]: Finished difference Result 68 states and 75 transitions. [2020-07-21 15:51:24,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-21 15:51:24,345 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 45 [2020-07-21 15:51:24,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:51:24,346 INFO L225 Difference]: With dead ends: 68 [2020-07-21 15:51:24,346 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 15:51:24,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 27.2s TimeCoverageRelationStatistics Valid=122, Invalid=630, Unknown=4, NotChecked=0, Total=756 [2020-07-21 15:51:24,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 15:51:24,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2020-07-21 15:51:24,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-07-21 15:51:24,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2020-07-21 15:51:24,357 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 45 [2020-07-21 15:51:24,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:51:24,358 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2020-07-21 15:51:24,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 15:51:24,358 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2020-07-21 15:51:24,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-07-21 15:51:24,359 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:51:24,359 INFO L422 BasicCegarLoop]: trace histogram [14, 11, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:51:24,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:24,560 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:51:24,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:51:24,561 INFO L82 PathProgramCache]: Analyzing trace with hash 539877124, now seen corresponding path program 14 times [2020-07-21 15:51:24,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:51:24,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [73265336] [2020-07-21 15:51:24,562 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:51:24,602 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:51:24,603 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:51:24,604 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 15:51:24,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:51:25,559 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:51:25,939 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 15:51:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:51:39,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:51:39,366 WARN L193 SmtUtils]: Spent 289.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 15:51:39,675 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 15:51:40,014 WARN L193 SmtUtils]: Spent 331.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 15:51:40,356 WARN L193 SmtUtils]: Spent 336.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 15:51:40,662 WARN L193 SmtUtils]: Spent 296.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 15:51:41,148 WARN L193 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 15:51:41,642 WARN L193 SmtUtils]: Spent 486.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:51:42,081 WARN L193 SmtUtils]: Spent 433.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:51:42,537 WARN L193 SmtUtils]: Spent 450.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:51:42,963 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 15:51:43,460 WARN L193 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 15:51:43,952 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 15:51:47,153 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [73265336] [2020-07-21 15:51:47,153 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:51:47,153 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-07-21 15:51:47,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [819213784] [2020-07-21 15:51:47,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 15:51:47,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:51:47,154 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 15:51:47,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=303, Unknown=3, NotChecked=0, Total=342 [2020-07-21 15:51:47,155 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 18 states. [2020-07-21 15:51:52,590 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:52:05,525 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:52:20,355 WARN L193 SmtUtils]: Spent 466.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 28 [2020-07-21 15:52:22,244 WARN L193 SmtUtils]: Spent 725.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 26 [2020-07-21 15:52:23,691 WARN L193 SmtUtils]: Spent 530.00 ms on a formula simplification. DAG size of input: 57 DAG size of output: 27 [2020-07-21 15:52:27,488 WARN L193 SmtUtils]: Spent 523.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 15:52:31,570 WARN L193 SmtUtils]: Spent 558.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 15:52:36,016 WARN L193 SmtUtils]: Spent 510.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:52:41,805 WARN L193 SmtUtils]: Spent 525.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:52:47,650 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 15:52:57,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:52:57,250 INFO L93 Difference]: Finished difference Result 70 states and 77 transitions. [2020-07-21 15:52:57,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 15:52:57,290 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 47 [2020-07-21 15:52:57,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:52:57,291 INFO L225 Difference]: With dead ends: 70 [2020-07-21 15:52:57,291 INFO L226 Difference]: Without dead ends: 54 [2020-07-21 15:52:57,292 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 41.7s TimeCoverageRelationStatistics Valid=142, Invalid=720, Unknown=8, NotChecked=0, Total=870 [2020-07-21 15:52:57,293 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-21 15:52:57,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-21 15:52:57,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 15:52:57,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 57 transitions. [2020-07-21 15:52:57,301 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 57 transitions. Word has length 47 [2020-07-21 15:52:57,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:52:57,301 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 57 transitions. [2020-07-21 15:52:57,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 15:52:57,301 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 57 transitions. [2020-07-21 15:52:57,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-21 15:52:57,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:52:57,302 INFO L422 BasicCegarLoop]: trace histogram [15, 12, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:52:57,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:57,504 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:52:57,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:52:57,505 INFO L82 PathProgramCache]: Analyzing trace with hash -1270926623, now seen corresponding path program 15 times [2020-07-21 15:52:57,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:52:57,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1631381002] [2020-07-21 15:52:57,506 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:52:57,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:52:57,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:52:57,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-21 15:52:57,550 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:52:58,667 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:52:59,146 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 15:53:14,848 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:53:14,849 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:53:15,234 WARN L193 SmtUtils]: Spent 383.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:53:15,604 WARN L193 SmtUtils]: Spent 363.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:53:16,031 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 15:53:16,456 WARN L193 SmtUtils]: Spent 418.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 15:53:16,866 WARN L193 SmtUtils]: Spent 400.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:53:17,530 WARN L193 SmtUtils]: Spent 656.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 15:53:18,482 WARN L193 SmtUtils]: Spent 945.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 15:53:19,221 WARN L193 SmtUtils]: Spent 731.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:53:19,921 WARN L193 SmtUtils]: Spent 691.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 15:53:20,548 WARN L193 SmtUtils]: Spent 620.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:53:21,137 WARN L193 SmtUtils]: Spent 582.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 15:53:21,731 WARN L193 SmtUtils]: Spent 587.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:53:22,241 WARN L193 SmtUtils]: Spent 503.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:53:24,256 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1631381002] [2020-07-21 15:53:24,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:53:24,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-07-21 15:53:24,256 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807785409] [2020-07-21 15:53:24,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 15:53:24,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:53:24,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 15:53:24,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=341, Unknown=1, NotChecked=0, Total=380 [2020-07-21 15:53:24,258 INFO L87 Difference]: Start difference. First operand 54 states and 57 transitions. Second operand 19 states. [2020-07-21 15:53:27,775 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:53:36,600 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:53:46,270 WARN L193 SmtUtils]: Spent 874.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 28 [2020-07-21 15:53:49,366 WARN L193 SmtUtils]: Spent 770.00 ms on a formula simplification. DAG size of input: 67 DAG size of output: 26 [2020-07-21 15:53:51,563 WARN L193 SmtUtils]: Spent 1.01 s on a formula simplification. DAG size of input: 63 DAG size of output: 27 [2020-07-21 15:53:56,128 WARN L193 SmtUtils]: Spent 741.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-21 15:54:02,456 WARN L193 SmtUtils]: Spent 759.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 15:54:11,056 WARN L193 SmtUtils]: Spent 597.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 15:54:21,229 WARN L193 SmtUtils]: Spent 653.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:54:31,718 WARN L193 SmtUtils]: Spent 529.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:54:43,567 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 15:55:05,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:55:05,097 INFO L93 Difference]: Finished difference Result 72 states and 79 transitions. [2020-07-21 15:55:05,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-21 15:55:05,129 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 49 [2020-07-21 15:55:05,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:55:05,130 INFO L225 Difference]: With dead ends: 72 [2020-07-21 15:55:05,130 INFO L226 Difference]: Without dead ends: 56 [2020-07-21 15:55:05,131 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 45.5s TimeCoverageRelationStatistics Valid=164, Invalid=825, Unknown=3, NotChecked=0, Total=992 [2020-07-21 15:55:05,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-07-21 15:55:05,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2020-07-21 15:55:05,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 15:55:05,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2020-07-21 15:55:05,141 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 49 [2020-07-21 15:55:05,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:55:05,141 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2020-07-21 15:55:05,141 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 15:55:05,142 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2020-07-21 15:55:05,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-07-21 15:55:05,142 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:55:05,142 INFO L422 BasicCegarLoop]: trace histogram [16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:55:05,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:55:05,343 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:55:05,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:55:05,344 INFO L82 PathProgramCache]: Analyzing trace with hash -1991572610, now seen corresponding path program 16 times [2020-07-21 15:55:05,344 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:55:05,345 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1617038138] [2020-07-21 15:55:05,345 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 15:55:05,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:55:05,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:55:05,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 15:55:05,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:55:06,626 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:55:07,220 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 15:55:38,944 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:55:38,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:55:39,377 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:55:39,819 WARN L193 SmtUtils]: Spent 434.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:55:40,308 WARN L193 SmtUtils]: Spent 480.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:55:40,796 WARN L193 SmtUtils]: Spent 481.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:55:41,265 WARN L193 SmtUtils]: Spent 458.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 15:55:42,128 WARN L193 SmtUtils]: Spent 856.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:55:42,926 WARN L193 SmtUtils]: Spent 789.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 15:55:43,697 WARN L193 SmtUtils]: Spent 763.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 15:55:44,483 WARN L193 SmtUtils]: Spent 778.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 15:55:45,192 WARN L193 SmtUtils]: Spent 702.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:55:45,848 WARN L193 SmtUtils]: Spent 648.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 15:55:46,595 WARN L193 SmtUtils]: Spent 740.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:55:47,311 WARN L193 SmtUtils]: Spent 710.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 15:55:47,950 WARN L193 SmtUtils]: Spent 631.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 15:55:50,373 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 15:55:50,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1617038138] [2020-07-21 15:55:50,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:55:50,381 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-07-21 15:55:50,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1693361932] [2020-07-21 15:55:50,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 15:55:50,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:55:50,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 15:55:50,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=374, Unknown=6, NotChecked=0, Total=420 [2020-07-21 15:55:50,383 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 20 states. [2020-07-21 15:55:57,299 WARN L193 SmtUtils]: Spent 227.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:56:06,176 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:56:11,829 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 15:56:16,148 WARN L193 SmtUtils]: Spent 845.00 ms on a formula simplification. DAG size of input: 79 DAG size of output: 28 [2020-07-21 15:56:21,034 WARN L193 SmtUtils]: Spent 879.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 26 [2020-07-21 15:56:23,848 WARN L193 SmtUtils]: Spent 964.00 ms on a formula simplification. DAG size of input: 69 DAG size of output: 27 [2020-07-21 15:56:29,325 WARN L193 SmtUtils]: Spent 913.00 ms on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-21 15:56:36,378 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-21 15:56:46,097 WARN L193 SmtUtils]: Spent 762.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 15:56:51,231 WARN L193 SmtUtils]: Spent 721.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 15:56:56,775 WARN L193 SmtUtils]: Spent 747.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:57:03,712 WARN L193 SmtUtils]: Spent 653.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28 [2020-07-21 15:57:07,052 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 28 [2020-07-21 15:57:12,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 15:57:12,388 INFO L93 Difference]: Finished difference Result 74 states and 81 transitions. [2020-07-21 15:57:12,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-21 15:57:12,441 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2020-07-21 15:57:12,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 15:57:12,442 INFO L225 Difference]: With dead ends: 74 [2020-07-21 15:57:12,442 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 15:57:12,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 73.3s TimeCoverageRelationStatistics Valid=188, Invalid=926, Unknown=8, NotChecked=0, Total=1122 [2020-07-21 15:57:12,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 15:57:12,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2020-07-21 15:57:12,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-07-21 15:57:12,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2020-07-21 15:57:12,454 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 51 [2020-07-21 15:57:12,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 15:57:12,455 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2020-07-21 15:57:12,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 15:57:12,455 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2020-07-21 15:57:12,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-07-21 15:57:12,456 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 15:57:12,456 INFO L422 BasicCegarLoop]: trace histogram [17, 14, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 15:57:12,664 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 15:57:12,665 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 15:57:12,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 15:57:12,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1252335835, now seen corresponding path program 17 times [2020-07-21 15:57:12,667 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 15:57:12,667 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [278663373] [2020-07-21 15:57:12,667 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 15:57:12,713 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 15:57:12,713 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 15:57:12,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 15:57:12,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 15:57:14,129 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 13 [2020-07-21 15:57:14,674 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification that was a NOOP. DAG size: 15 [2020-07-21 15:57:28,631 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 15:57:37,980 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 21 [2020-07-21 15:57:43,637 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 22 [2020-07-21 15:57:43,748 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 15:57:43,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 15:57:44,275 WARN L193 SmtUtils]: Spent 524.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:57:44,802 WARN L193 SmtUtils]: Spent 518.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:57:45,390 WARN L193 SmtUtils]: Spent 578.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:57:45,981 WARN L193 SmtUtils]: Spent 582.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:57:46,539 WARN L193 SmtUtils]: Spent 545.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 15:57:47,103 WARN L193 SmtUtils]: Spent 555.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 15:57:47,616 WARN L193 SmtUtils]: Spent 504.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 15:57:48,089 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification that was a NOOP. DAG size: 69 [2020-07-21 15:57:48,900 WARN L193 SmtUtils]: Spent 802.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 15:57:49,839 WARN L193 SmtUtils]: Spent 930.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 15:57:50,691 WARN L193 SmtUtils]: Spent 843.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 15:57:51,528 WARN L193 SmtUtils]: Spent 828.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 15:57:52,373 WARN L193 SmtUtils]: Spent 837.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 15:57:53,101 WARN L193 SmtUtils]: Spent 719.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 15:57:53,795 WARN L193 SmtUtils]: Spent 686.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 15:57:56,238 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 15:57:56,244 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [278663373] [2020-07-21 15:57:56,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-07-21 15:57:56,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-07-21 15:57:56,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1000601704] [2020-07-21 15:57:56,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 15:57:56,245 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 15:57:56,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 15:57:56,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=418, Unknown=2, NotChecked=0, Total=462 [2020-07-21 15:57:56,246 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 21 states. [2020-07-21 15:58:15,231 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 11 [2020-07-21 15:58:28,346 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2020-07-21 15:58:34,055 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 14 [2020-07-21 15:58:40,538 WARN L193 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 85 DAG size of output: 28 [2020-07-21 15:58:47,361 WARN L193 SmtUtils]: Spent 1.14 s on a formula simplification. DAG size of input: 79 DAG size of output: 26 [2020-07-21 15:58:52,279 WARN L193 SmtUtils]: Spent 1.03 s on a formula simplification. DAG size of input: 75 DAG size of output: 27 [2020-07-21 15:58:59,129 WARN L193 SmtUtils]: Spent 974.00 ms on a formula simplification. DAG size of input: 70 DAG size of output: 28 [2020-07-21 15:59:05,708 WARN L193 SmtUtils]: Spent 1.08 s on a formula simplification. DAG size of input: 64 DAG size of output: 28 [2020-07-21 15:59:11,980 WARN L193 SmtUtils]: Spent 712.00 ms on a formula simplification. DAG size of input: 58 DAG size of output: 28 [2020-07-21 15:59:15,910 WARN L193 SmtUtils]: Spent 663.00 ms on a formula simplification. DAG size of input: 52 DAG size of output: 28 [2020-07-21 15:59:19,403 WARN L193 SmtUtils]: Spent 608.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 28 [2020-07-21 15:59:24,339 WARN L193 SmtUtils]: Spent 689.00 ms on a formula simplification. DAG size of input: 40 DAG size of output: 28 [2020-07-21 15:59:30,807 WARN L193 SmtUtils]: Spent 462.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 28