/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/locks/test_locks_11.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:05:14,196 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 01:05:14,201 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 01:05:14,233 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 01:05:14,233 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:05:14,237 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:05:14,241 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:05:14,256 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:05:14,261 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:05:14,266 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:05:14,267 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:05:14,269 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:05:14,269 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:05:14,271 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:05:14,272 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:05:14,274 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:05:14,276 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:05:14,277 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:05:14,279 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:05:14,282 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:05:14,285 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:05:14,287 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:05:14,288 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:05:14,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:05:14,294 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:05:14,308 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:05:14,309 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:05:14,310 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:05:14,312 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 01:05:14,333 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:05:14,333 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:05:14,336 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:05:14,337 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:05:14,337 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:05:14,338 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:05:14,338 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:05:14,338 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:05:14,338 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:05:14,339 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:05:14,339 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:05:14,339 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:05:14,339 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:05:14,339 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:05:14,340 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:05:14,340 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:05:14,340 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:05:14,340 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:05:14,341 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:05:14,341 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:05:14,341 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:05:14,342 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:05:14,342 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:05:14,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:05:14,342 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:05:14,343 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:05:14,343 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:14,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:05:14,344 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:05:14,344 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 -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:05:14,751 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:05:14,790 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:05:14,795 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:05:14,798 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:05:14,799 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:05:14,803 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 01:05:14,954 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c06af55b3/c50c52eb340843e09b0dc826d5e3d791/FLAG181ab3166 [2020-07-21 01:05:15,646 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:05:15,648 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/locks/test_locks_11.c [2020-07-21 01:05:15,663 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c06af55b3/c50c52eb340843e09b0dc826d5e3d791/FLAG181ab3166 [2020-07-21 01:05:15,690 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c06af55b3/c50c52eb340843e09b0dc826d5e3d791 [2020-07-21 01:05:15,708 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:05:15,714 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:05:15,716 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:15,716 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:05:15,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:05:15,726 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:15" (1/1) ... [2020-07-21 01:05:15,732 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@289dbef6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:15, skipping insertion in model container [2020-07-21 01:05:15,732 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:05:15" (1/1) ... [2020-07-21 01:05:15,748 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:05:15,786 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:05:16,068 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:16,078 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:05:16,118 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:05:16,144 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:05:16,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16 WrapperNode [2020-07-21 01:05:16,146 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:05:16,148 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:05:16,148 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:05:16,149 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:05:16,326 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,328 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,346 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,347 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,369 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,383 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,386 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (1/1) ... [2020-07-21 01:05:16,391 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:05:16,392 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:05:16,393 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:05:16,393 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:05:16,395 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (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 01:05:16,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:05:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:05:16,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:05:16,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:05:16,497 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:05:16,498 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:05:16,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:05:16,499 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:05:17,004 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:05:17,005 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:05:17,013 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:17 BoogieIcfgContainer [2020-07-21 01:05:17,014 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:05:17,016 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:05:17,017 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:05:17,022 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:05:17,022 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:05:15" (1/3) ... [2020-07-21 01:05:17,024 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c894f58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:17, skipping insertion in model container [2020-07-21 01:05:17,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:05:16" (2/3) ... [2020-07-21 01:05:17,025 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7c894f58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:05:17, skipping insertion in model container [2020-07-21 01:05:17,025 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:05:17" (3/3) ... [2020-07-21 01:05:17,028 INFO L109 eAbstractionObserver]: Analyzing ICFG test_locks_11.c [2020-07-21 01:05:17,048 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:05:17,061 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:05:17,086 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:05:17,146 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:05:17,147 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:05:17,147 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:05:17,151 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:05:17,151 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:05:17,151 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:05:17,152 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:05:17,152 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:05:17,193 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states. [2020-07-21 01:05:17,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:17,202 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:17,204 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 01:05:17,204 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:17,213 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:17,213 INFO L82 PathProgramCache]: Analyzing trace with hash -316470182, now seen corresponding path program 1 times [2020-07-21 01:05:17,225 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:17,226 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26122091] [2020-07-21 01:05:17,227 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:17,396 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:17,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:17,401 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:17,416 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:17,477 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 01:05:17,477 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:17,480 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26122091] [2020-07-21 01:05:17,481 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:17,482 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:17,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [392752389] [2020-07-21 01:05:17,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:17,492 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:17,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:17,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:17,518 INFO L87 Difference]: Start difference. First operand 47 states. Second operand 3 states. [2020-07-21 01:05:17,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:17,609 INFO L93 Difference]: Finished difference Result 93 states and 162 transitions. [2020-07-21 01:05:17,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:17,613 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:17,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:17,633 INFO L225 Difference]: With dead ends: 93 [2020-07-21 01:05:17,634 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 01:05:17,639 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 01:05:17,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 01:05:17,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 54. [2020-07-21 01:05:17,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-21 01:05:17,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 97 transitions. [2020-07-21 01:05:17,717 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 97 transitions. Word has length 21 [2020-07-21 01:05:17,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:17,718 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 97 transitions. [2020-07-21 01:05:17,719 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:17,719 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 97 transitions. [2020-07-21 01:05:17,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-21 01:05:17,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:17,721 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 01:05:17,937 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:17,938 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:17,940 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:17,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1327587432, now seen corresponding path program 1 times [2020-07-21 01:05:17,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:17,942 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814674695] [2020-07-21 01:05:17,942 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:18,042 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:18,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:18,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:18,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:18,069 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 01:05:18,070 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:18,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814674695] [2020-07-21 01:05:18,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:18,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:18,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [676200370] [2020-07-21 01:05:18,074 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:18,075 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:18,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:18,076 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:18,076 INFO L87 Difference]: Start difference. First operand 54 states and 97 transitions. Second operand 3 states. [2020-07-21 01:05:18,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:18,113 INFO L93 Difference]: Finished difference Result 127 states and 232 transitions. [2020-07-21 01:05:18,114 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:18,115 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 21 [2020-07-21 01:05:18,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:18,117 INFO L225 Difference]: With dead ends: 127 [2020-07-21 01:05:18,118 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 01:05:18,120 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 19 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 01:05:18,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 01:05:18,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2020-07-21 01:05:18,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 01:05:18,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 137 transitions. [2020-07-21 01:05:18,139 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 137 transitions. Word has length 21 [2020-07-21 01:05:18,139 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:18,139 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 137 transitions. [2020-07-21 01:05:18,139 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:18,140 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 137 transitions. [2020-07-21 01:05:18,141 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:18,141 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:18,142 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, 1] [2020-07-21 01:05:18,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:18,358 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:18,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:18,360 INFO L82 PathProgramCache]: Analyzing trace with hash -1220427994, now seen corresponding path program 1 times [2020-07-21 01:05:18,361 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:18,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1895932089] [2020-07-21 01:05:18,364 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:18,456 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:18,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:18,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:18,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:18,481 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 01:05:18,482 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:18,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1895932089] [2020-07-21 01:05:18,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:18,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:18,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47209480] [2020-07-21 01:05:18,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:18,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:18,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:18,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:18,487 INFO L87 Difference]: Start difference. First operand 76 states and 137 transitions. Second operand 3 states. [2020-07-21 01:05:18,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:18,559 INFO L93 Difference]: Finished difference Result 117 states and 207 transitions. [2020-07-21 01:05:18,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:18,562 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:18,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:18,565 INFO L225 Difference]: With dead ends: 117 [2020-07-21 01:05:18,569 INFO L226 Difference]: Without dead ends: 81 [2020-07-21 01:05:18,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 01:05:18,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-07-21 01:05:18,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 79. [2020-07-21 01:05:18,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 01:05:18,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 139 transitions. [2020-07-21 01:05:18,612 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 139 transitions. Word has length 22 [2020-07-21 01:05:18,613 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:18,613 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 139 transitions. [2020-07-21 01:05:18,614 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:18,614 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 139 transitions. [2020-07-21 01:05:18,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:18,616 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:18,616 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, 1] [2020-07-21 01:05:18,831 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:18,832 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:18,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:18,833 INFO L82 PathProgramCache]: Analyzing trace with hash 1794675624, now seen corresponding path program 1 times [2020-07-21 01:05:18,834 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:18,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1838731579] [2020-07-21 01:05:18,835 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:18,972 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:18,972 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:18,975 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:18,981 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:19,006 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 01:05:19,006 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:19,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1838731579] [2020-07-21 01:05:19,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:19,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:19,013 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1220436256] [2020-07-21 01:05:19,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:19,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:19,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:19,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:19,017 INFO L87 Difference]: Start difference. First operand 79 states and 139 transitions. Second operand 3 states. [2020-07-21 01:05:19,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:19,056 INFO L93 Difference]: Finished difference Result 148 states and 264 transitions. [2020-07-21 01:05:19,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:19,058 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:19,058 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:19,060 INFO L225 Difference]: With dead ends: 148 [2020-07-21 01:05:19,060 INFO L226 Difference]: Without dead ends: 146 [2020-07-21 01:05:19,061 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 01:05:19,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2020-07-21 01:05:19,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 104. [2020-07-21 01:05:19,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2020-07-21 01:05:19,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 184 transitions. [2020-07-21 01:05:19,077 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 184 transitions. Word has length 22 [2020-07-21 01:05:19,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:19,098 INFO L479 AbstractCegarLoop]: Abstraction has 104 states and 184 transitions. [2020-07-21 01:05:19,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:19,103 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 184 transitions. [2020-07-21 01:05:19,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:05:19,110 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:19,110 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, 1] [2020-07-21 01:05:19,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:19,316 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:19,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:19,317 INFO L82 PathProgramCache]: Analyzing trace with hash 783558374, now seen corresponding path program 1 times [2020-07-21 01:05:19,318 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:19,318 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1712447563] [2020-07-21 01:05:19,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 01:05:19,393 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:19,394 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:19,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:19,398 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:19,410 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 01:05:19,410 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:19,411 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1712447563] [2020-07-21 01:05:19,411 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:19,412 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:19,412 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [656406354] [2020-07-21 01:05:19,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:19,413 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:19,414 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:19,414 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:19,414 INFO L87 Difference]: Start difference. First operand 104 states and 184 transitions. Second operand 3 states. [2020-07-21 01:05:19,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:19,450 INFO L93 Difference]: Finished difference Result 244 states and 438 transitions. [2020-07-21 01:05:19,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:19,451 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 22 [2020-07-21 01:05:19,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:19,453 INFO L225 Difference]: With dead ends: 244 [2020-07-21 01:05:19,453 INFO L226 Difference]: Without dead ends: 148 [2020-07-21 01:05:19,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 20 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 01:05:19,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2020-07-21 01:05:19,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 146. [2020-07-21 01:05:19,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2020-07-21 01:05:19,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 258 transitions. [2020-07-21 01:05:19,472 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 258 transitions. Word has length 22 [2020-07-21 01:05:19,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:19,473 INFO L479 AbstractCegarLoop]: Abstraction has 146 states and 258 transitions. [2020-07-21 01:05:19,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:19,473 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 258 transitions. [2020-07-21 01:05:19,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:19,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:19,475 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, 1, 1] [2020-07-21 01:05:19,688 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:19,690 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:19,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:19,691 INFO L82 PathProgramCache]: Analyzing trace with hash -199417107, now seen corresponding path program 1 times [2020-07-21 01:05:19,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:19,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115962250] [2020-07-21 01:05:19,693 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:19,771 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:19,772 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:19,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:19,782 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:19,809 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 01:05:19,810 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:19,815 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115962250] [2020-07-21 01:05:19,816 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:19,817 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:19,817 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [475395371] [2020-07-21 01:05:19,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:19,818 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:19,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:19,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:19,819 INFO L87 Difference]: Start difference. First operand 146 states and 258 transitions. Second operand 3 states. [2020-07-21 01:05:19,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:19,855 INFO L93 Difference]: Finished difference Result 219 states and 385 transitions. [2020-07-21 01:05:19,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:19,856 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:19,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:19,858 INFO L225 Difference]: With dead ends: 219 [2020-07-21 01:05:19,858 INFO L226 Difference]: Without dead ends: 150 [2020-07-21 01:05:19,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 01:05:19,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2020-07-21 01:05:19,870 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2020-07-21 01:05:19,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2020-07-21 01:05:19,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 258 transitions. [2020-07-21 01:05:19,874 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 258 transitions. Word has length 23 [2020-07-21 01:05:19,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:19,874 INFO L479 AbstractCegarLoop]: Abstraction has 148 states and 258 transitions. [2020-07-21 01:05:19,875 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:19,875 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 258 transitions. [2020-07-21 01:05:19,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:19,877 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:19,877 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, 1, 1] [2020-07-21 01:05:20,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,092 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:20,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:20,093 INFO L82 PathProgramCache]: Analyzing trace with hash -1479280785, now seen corresponding path program 1 times [2020-07-21 01:05:20,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:20,094 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920304554] [2020-07-21 01:05:20,094 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:20,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:20,149 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:20,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:20,176 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 01:05:20,176 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:20,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920304554] [2020-07-21 01:05:20,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:20,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:20,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544702318] [2020-07-21 01:05:20,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:20,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:20,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:20,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:20,181 INFO L87 Difference]: Start difference. First operand 148 states and 258 transitions. Second operand 3 states. [2020-07-21 01:05:20,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:20,216 INFO L93 Difference]: Finished difference Result 276 states and 488 transitions. [2020-07-21 01:05:20,216 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:20,217 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:20,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:20,220 INFO L225 Difference]: With dead ends: 276 [2020-07-21 01:05:20,220 INFO L226 Difference]: Without dead ends: 274 [2020-07-21 01:05:20,222 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 01:05:20,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 274 states. [2020-07-21 01:05:20,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 274 to 200. [2020-07-21 01:05:20,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 200 states. [2020-07-21 01:05:20,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 200 states to 200 states and 346 transitions. [2020-07-21 01:05:20,256 INFO L78 Accepts]: Start accepts. Automaton has 200 states and 346 transitions. Word has length 23 [2020-07-21 01:05:20,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:20,257 INFO L479 AbstractCegarLoop]: Abstraction has 200 states and 346 transitions. [2020-07-21 01:05:20,257 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:20,258 INFO L276 IsEmpty]: Start isEmpty. Operand 200 states and 346 transitions. [2020-07-21 01:05:20,260 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 01:05:20,262 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:20,263 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, 1, 1] [2020-07-21 01:05:20,477 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,478 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:20,479 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:20,479 INFO L82 PathProgramCache]: Analyzing trace with hash 1804569261, now seen corresponding path program 1 times [2020-07-21 01:05:20,480 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:20,480 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [154928903] [2020-07-21 01:05:20,481 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:20,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:20,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:20,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:20,561 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 01:05:20,561 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:20,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [154928903] [2020-07-21 01:05:20,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:20,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:20,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645874027] [2020-07-21 01:05:20,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:20,567 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:20,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:20,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:20,568 INFO L87 Difference]: Start difference. First operand 200 states and 346 transitions. Second operand 3 states. [2020-07-21 01:05:20,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:20,620 INFO L93 Difference]: Finished difference Result 472 states and 824 transitions. [2020-07-21 01:05:20,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:20,621 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 01:05:20,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:20,624 INFO L225 Difference]: With dead ends: 472 [2020-07-21 01:05:20,624 INFO L226 Difference]: Without dead ends: 282 [2020-07-21 01:05:20,631 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 01:05:20,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2020-07-21 01:05:20,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 280. [2020-07-21 01:05:20,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2020-07-21 01:05:20,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 482 transitions. [2020-07-21 01:05:20,680 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 482 transitions. Word has length 23 [2020-07-21 01:05:20,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:20,682 INFO L479 AbstractCegarLoop]: Abstraction has 280 states and 482 transitions. [2020-07-21 01:05:20,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:20,682 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 482 transitions. [2020-07-21 01:05:20,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:20,693 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:20,693 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, 1, 1, 1] [2020-07-21 01:05:20,894 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,895 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:20,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:20,896 INFO L82 PathProgramCache]: Analyzing trace with hash 1387149659, now seen corresponding path program 1 times [2020-07-21 01:05:20,897 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:20,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641312353] [2020-07-21 01:05:20,898 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:20,949 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:20,950 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:20,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:20,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:20,974 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 01:05:20,975 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:20,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641312353] [2020-07-21 01:05:20,976 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:20,976 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:20,976 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505657321] [2020-07-21 01:05:20,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:20,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:20,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:20,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:20,978 INFO L87 Difference]: Start difference. First operand 280 states and 482 transitions. Second operand 3 states. [2020-07-21 01:05:21,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:21,020 INFO L93 Difference]: Finished difference Result 420 states and 720 transitions. [2020-07-21 01:05:21,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:21,020 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:05:21,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:21,025 INFO L225 Difference]: With dead ends: 420 [2020-07-21 01:05:21,026 INFO L226 Difference]: Without dead ends: 286 [2020-07-21 01:05:21,032 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 01:05:21,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2020-07-21 01:05:21,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2020-07-21 01:05:21,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 284 states. [2020-07-21 01:05:21,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 482 transitions. [2020-07-21 01:05:21,060 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 482 transitions. Word has length 24 [2020-07-21 01:05:21,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:21,062 INFO L479 AbstractCegarLoop]: Abstraction has 284 states and 482 transitions. [2020-07-21 01:05:21,062 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:21,062 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 482 transitions. [2020-07-21 01:05:21,068 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:21,068 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:21,069 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, 1, 1, 1] [2020-07-21 01:05:21,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:21,286 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:21,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:21,287 INFO L82 PathProgramCache]: Analyzing trace with hash 107285981, now seen corresponding path program 1 times [2020-07-21 01:05:21,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:21,289 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [534884752] [2020-07-21 01:05:21,289 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:21,344 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:21,344 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:21,346 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:21,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:21,358 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 01:05:21,358 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:21,359 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [534884752] [2020-07-21 01:05:21,359 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:21,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:21,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2075651456] [2020-07-21 01:05:21,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:21,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:21,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:21,362 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:21,363 INFO L87 Difference]: Start difference. First operand 284 states and 482 transitions. Second operand 3 states. [2020-07-21 01:05:21,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:21,394 INFO L93 Difference]: Finished difference Result 524 states and 904 transitions. [2020-07-21 01:05:21,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:21,395 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:05:21,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:21,399 INFO L225 Difference]: With dead ends: 524 [2020-07-21 01:05:21,400 INFO L226 Difference]: Without dead ends: 522 [2020-07-21 01:05:21,402 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 01:05:21,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 522 states. [2020-07-21 01:05:21,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 522 to 392. [2020-07-21 01:05:21,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 392 states. [2020-07-21 01:05:21,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 392 states to 392 states and 654 transitions. [2020-07-21 01:05:21,428 INFO L78 Accepts]: Start accepts. Automaton has 392 states and 654 transitions. Word has length 24 [2020-07-21 01:05:21,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:21,428 INFO L479 AbstractCegarLoop]: Abstraction has 392 states and 654 transitions. [2020-07-21 01:05:21,428 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:21,429 INFO L276 IsEmpty]: Start isEmpty. Operand 392 states and 654 transitions. [2020-07-21 01:05:21,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-07-21 01:05:21,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:21,431 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, 1, 1, 1] [2020-07-21 01:05:21,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:21,647 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:21,648 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:21,648 INFO L82 PathProgramCache]: Analyzing trace with hash -903831269, now seen corresponding path program 1 times [2020-07-21 01:05:21,649 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:21,650 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [604515392] [2020-07-21 01:05:21,650 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:21,705 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:21,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:21,708 INFO L263 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:21,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:21,726 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 01:05:21,727 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:21,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [604515392] [2020-07-21 01:05:21,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:21,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:21,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902099910] [2020-07-21 01:05:21,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:21,730 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:21,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:21,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:21,731 INFO L87 Difference]: Start difference. First operand 392 states and 654 transitions. Second operand 3 states. [2020-07-21 01:05:21,797 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:21,798 INFO L93 Difference]: Finished difference Result 924 states and 1552 transitions. [2020-07-21 01:05:21,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:21,799 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 24 [2020-07-21 01:05:21,801 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:21,807 INFO L225 Difference]: With dead ends: 924 [2020-07-21 01:05:21,807 INFO L226 Difference]: Without dead ends: 546 [2020-07-21 01:05:21,810 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 22 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 01:05:21,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 546 states. [2020-07-21 01:05:21,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 546 to 544. [2020-07-21 01:05:21,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 544 states. [2020-07-21 01:05:21,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 544 states to 544 states and 902 transitions. [2020-07-21 01:05:21,855 INFO L78 Accepts]: Start accepts. Automaton has 544 states and 902 transitions. Word has length 24 [2020-07-21 01:05:21,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:21,856 INFO L479 AbstractCegarLoop]: Abstraction has 544 states and 902 transitions. [2020-07-21 01:05:21,856 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:21,856 INFO L276 IsEmpty]: Start isEmpty. Operand 544 states and 902 transitions. [2020-07-21 01:05:21,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:05:21,862 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:21,863 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, 1, 1, 1, 1] [2020-07-21 01:05:22,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,078 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:22,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:22,079 INFO L82 PathProgramCache]: Analyzing trace with hash -968887806, now seen corresponding path program 1 times [2020-07-21 01:05:22,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:22,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391631373] [2020-07-21 01:05:22,081 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:22,146 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:22,148 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:22,151 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:22,174 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 01:05:22,174 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:22,175 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391631373] [2020-07-21 01:05:22,175 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:22,176 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:22,176 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216045198] [2020-07-21 01:05:22,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:22,180 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:22,180 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:22,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:22,183 INFO L87 Difference]: Start difference. First operand 544 states and 902 transitions. Second operand 3 states. [2020-07-21 01:05:22,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:22,229 INFO L93 Difference]: Finished difference Result 816 states and 1348 transitions. [2020-07-21 01:05:22,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:22,230 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:05:22,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:22,239 INFO L225 Difference]: With dead ends: 816 [2020-07-21 01:05:22,240 INFO L226 Difference]: Without dead ends: 554 [2020-07-21 01:05:22,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 01:05:22,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2020-07-21 01:05:22,269 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 552. [2020-07-21 01:05:22,270 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 552 states. [2020-07-21 01:05:22,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 552 states to 552 states and 902 transitions. [2020-07-21 01:05:22,277 INFO L78 Accepts]: Start accepts. Automaton has 552 states and 902 transitions. Word has length 25 [2020-07-21 01:05:22,278 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:22,278 INFO L479 AbstractCegarLoop]: Abstraction has 552 states and 902 transitions. [2020-07-21 01:05:22,278 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:22,278 INFO L276 IsEmpty]: Start isEmpty. Operand 552 states and 902 transitions. [2020-07-21 01:05:22,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:05:22,281 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:22,281 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, 1, 1, 1, 1] [2020-07-21 01:05:22,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,496 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:22,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:22,498 INFO L82 PathProgramCache]: Analyzing trace with hash 2046215812, now seen corresponding path program 1 times [2020-07-21 01:05:22,499 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:22,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [449345770] [2020-07-21 01:05:22,500 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:22,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:22,586 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:22,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:22,618 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 01:05:22,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:22,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [449345770] [2020-07-21 01:05:22,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:22,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:22,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96508695] [2020-07-21 01:05:22,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:22,624 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:22,625 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:22,625 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:22,626 INFO L87 Difference]: Start difference. First operand 552 states and 902 transitions. Second operand 3 states. [2020-07-21 01:05:22,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:22,660 INFO L93 Difference]: Finished difference Result 1004 states and 1672 transitions. [2020-07-21 01:05:22,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:22,662 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:05:22,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:22,675 INFO L225 Difference]: With dead ends: 1004 [2020-07-21 01:05:22,675 INFO L226 Difference]: Without dead ends: 1002 [2020-07-21 01:05:22,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 01:05:22,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1002 states. [2020-07-21 01:05:22,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1002 to 776. [2020-07-21 01:05:22,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 776 states. [2020-07-21 01:05:22,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 776 states to 776 states and 1238 transitions. [2020-07-21 01:05:22,725 INFO L78 Accepts]: Start accepts. Automaton has 776 states and 1238 transitions. Word has length 25 [2020-07-21 01:05:22,725 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:22,725 INFO L479 AbstractCegarLoop]: Abstraction has 776 states and 1238 transitions. [2020-07-21 01:05:22,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:22,726 INFO L276 IsEmpty]: Start isEmpty. Operand 776 states and 1238 transitions. [2020-07-21 01:05:22,728 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 01:05:22,729 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:22,729 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, 1, 1, 1, 1] [2020-07-21 01:05:22,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,944 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:22,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:22,945 INFO L82 PathProgramCache]: Analyzing trace with hash 1035098562, now seen corresponding path program 1 times [2020-07-21 01:05:22,946 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:22,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [715170978] [2020-07-21 01:05:22,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:22,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:22,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:22,993 INFO L263 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:22,995 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:23,014 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 01:05:23,015 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:23,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [715170978] [2020-07-21 01:05:23,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:23,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:23,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794964299] [2020-07-21 01:05:23,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:23,018 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:23,018 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:23,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:23,019 INFO L87 Difference]: Start difference. First operand 776 states and 1238 transitions. Second operand 3 states. [2020-07-21 01:05:23,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:23,065 INFO L93 Difference]: Finished difference Result 1820 states and 2920 transitions. [2020-07-21 01:05:23,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:23,065 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 25 [2020-07-21 01:05:23,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:23,074 INFO L225 Difference]: With dead ends: 1820 [2020-07-21 01:05:23,074 INFO L226 Difference]: Without dead ends: 1066 [2020-07-21 01:05:23,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 23 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 01:05:23,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1066 states. [2020-07-21 01:05:23,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1066 to 1064. [2020-07-21 01:05:23,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1064 states. [2020-07-21 01:05:23,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1064 states to 1064 states and 1686 transitions. [2020-07-21 01:05:23,137 INFO L78 Accepts]: Start accepts. Automaton has 1064 states and 1686 transitions. Word has length 25 [2020-07-21 01:05:23,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:23,138 INFO L479 AbstractCegarLoop]: Abstraction has 1064 states and 1686 transitions. [2020-07-21 01:05:23,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:23,138 INFO L276 IsEmpty]: Start isEmpty. Operand 1064 states and 1686 transitions. [2020-07-21 01:05:23,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:05:23,144 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:23,144 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, 1, 1, 1, 1, 1] [2020-07-21 01:05:23,357 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:23,359 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:23,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:23,360 INFO L82 PathProgramCache]: Analyzing trace with hash -991604848, now seen corresponding path program 1 times [2020-07-21 01:05:23,360 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:23,361 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [492053714] [2020-07-21 01:05:23,361 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:23,438 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:23,439 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:23,441 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:23,461 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:23,477 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 01:05:23,478 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:23,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [492053714] [2020-07-21 01:05:23,480 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:23,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:23,481 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737046268] [2020-07-21 01:05:23,482 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:23,482 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:23,483 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:23,483 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:23,483 INFO L87 Difference]: Start difference. First operand 1064 states and 1686 transitions. Second operand 3 states. [2020-07-21 01:05:23,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:23,541 INFO L93 Difference]: Finished difference Result 1596 states and 2520 transitions. [2020-07-21 01:05:23,542 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:23,542 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:05:23,543 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:23,553 INFO L225 Difference]: With dead ends: 1596 [2020-07-21 01:05:23,554 INFO L226 Difference]: Without dead ends: 1082 [2020-07-21 01:05:23,561 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 01:05:23,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1082 states. [2020-07-21 01:05:23,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1082 to 1080. [2020-07-21 01:05:23,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1080 states. [2020-07-21 01:05:23,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1080 states to 1080 states and 1686 transitions. [2020-07-21 01:05:23,624 INFO L78 Accepts]: Start accepts. Automaton has 1080 states and 1686 transitions. Word has length 26 [2020-07-21 01:05:23,626 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:23,627 INFO L479 AbstractCegarLoop]: Abstraction has 1080 states and 1686 transitions. [2020-07-21 01:05:23,627 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:23,628 INFO L276 IsEmpty]: Start isEmpty. Operand 1080 states and 1686 transitions. [2020-07-21 01:05:23,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:05:23,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:23,633 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, 1, 1, 1, 1, 1] [2020-07-21 01:05:23,847 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:23,848 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:23,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:23,849 INFO L82 PathProgramCache]: Analyzing trace with hash 2023498770, now seen corresponding path program 1 times [2020-07-21 01:05:23,850 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:23,850 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [526677354] [2020-07-21 01:05:23,851 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:23,920 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:23,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:23,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:23,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:23,936 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 01:05:23,937 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:23,938 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [526677354] [2020-07-21 01:05:23,939 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:23,939 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:23,940 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794592080] [2020-07-21 01:05:23,940 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:23,940 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:23,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:23,941 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:23,941 INFO L87 Difference]: Start difference. First operand 1080 states and 1686 transitions. Second operand 3 states. [2020-07-21 01:05:24,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:24,003 INFO L93 Difference]: Finished difference Result 1932 states and 3080 transitions. [2020-07-21 01:05:24,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:24,004 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:05:24,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:24,020 INFO L225 Difference]: With dead ends: 1932 [2020-07-21 01:05:24,020 INFO L226 Difference]: Without dead ends: 1930 [2020-07-21 01:05:24,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 01:05:24,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1930 states. [2020-07-21 01:05:24,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1930 to 1544. [2020-07-21 01:05:24,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1544 states. [2020-07-21 01:05:24,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1544 states to 1544 states and 2342 transitions. [2020-07-21 01:05:24,133 INFO L78 Accepts]: Start accepts. Automaton has 1544 states and 2342 transitions. Word has length 26 [2020-07-21 01:05:24,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:24,133 INFO L479 AbstractCegarLoop]: Abstraction has 1544 states and 2342 transitions. [2020-07-21 01:05:24,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:24,134 INFO L276 IsEmpty]: Start isEmpty. Operand 1544 states and 2342 transitions. [2020-07-21 01:05:24,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 01:05:24,139 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:24,140 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, 1, 1, 1, 1, 1] [2020-07-21 01:05:24,354 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:24,354 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:24,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:24,355 INFO L82 PathProgramCache]: Analyzing trace with hash 1012381520, now seen corresponding path program 1 times [2020-07-21 01:05:24,356 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:24,356 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924664097] [2020-07-21 01:05:24,357 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:24,420 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:24,420 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:24,422 INFO L263 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:24,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:24,441 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 01:05:24,442 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:24,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924664097] [2020-07-21 01:05:24,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:24,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:24,449 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180511339] [2020-07-21 01:05:24,450 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:24,450 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:24,451 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:24,451 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:24,451 INFO L87 Difference]: Start difference. First operand 1544 states and 2342 transitions. Second operand 3 states. [2020-07-21 01:05:24,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:24,527 INFO L93 Difference]: Finished difference Result 3596 states and 5480 transitions. [2020-07-21 01:05:24,528 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:24,528 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 26 [2020-07-21 01:05:24,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:24,542 INFO L225 Difference]: With dead ends: 3596 [2020-07-21 01:05:24,543 INFO L226 Difference]: Without dead ends: 2090 [2020-07-21 01:05:24,549 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 24 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 01:05:24,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2090 states. [2020-07-21 01:05:24,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2090 to 2088. [2020-07-21 01:05:24,627 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2088 states. [2020-07-21 01:05:24,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2088 states to 2088 states and 3142 transitions. [2020-07-21 01:05:24,639 INFO L78 Accepts]: Start accepts. Automaton has 2088 states and 3142 transitions. Word has length 26 [2020-07-21 01:05:24,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:24,639 INFO L479 AbstractCegarLoop]: Abstraction has 2088 states and 3142 transitions. [2020-07-21 01:05:24,639 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:24,639 INFO L276 IsEmpty]: Start isEmpty. Operand 2088 states and 3142 transitions. [2020-07-21 01:05:24,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:05:24,644 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:24,644 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, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:24,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:24,860 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:24,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:24,861 INFO L82 PathProgramCache]: Analyzing trace with hash -1695832809, now seen corresponding path program 1 times [2020-07-21 01:05:24,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:24,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [516852176] [2020-07-21 01:05:24,863 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:24,908 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:24,909 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:24,911 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:24,913 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:24,933 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 01:05:24,934 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:24,935 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [516852176] [2020-07-21 01:05:24,935 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:24,935 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:24,935 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1728643377] [2020-07-21 01:05:24,936 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:24,936 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:24,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:24,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:24,937 INFO L87 Difference]: Start difference. First operand 2088 states and 3142 transitions. Second operand 3 states. [2020-07-21 01:05:24,995 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:24,996 INFO L93 Difference]: Finished difference Result 3132 states and 4696 transitions. [2020-07-21 01:05:24,996 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:24,997 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 01:05:24,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:25,013 INFO L225 Difference]: With dead ends: 3132 [2020-07-21 01:05:25,014 INFO L226 Difference]: Without dead ends: 2122 [2020-07-21 01:05:25,019 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 01:05:25,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2122 states. [2020-07-21 01:05:25,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2122 to 2120. [2020-07-21 01:05:25,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 2120 states. [2020-07-21 01:05:25,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2120 states to 2120 states and 3142 transitions. [2020-07-21 01:05:25,117 INFO L78 Accepts]: Start accepts. Automaton has 2120 states and 3142 transitions. Word has length 27 [2020-07-21 01:05:25,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:25,118 INFO L479 AbstractCegarLoop]: Abstraction has 2120 states and 3142 transitions. [2020-07-21 01:05:25,118 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:25,118 INFO L276 IsEmpty]: Start isEmpty. Operand 2120 states and 3142 transitions. [2020-07-21 01:05:25,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:05:25,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:25,123 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, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:25,338 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:25,338 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:25,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:25,339 INFO L82 PathProgramCache]: Analyzing trace with hash 1319270809, now seen corresponding path program 1 times [2020-07-21 01:05:25,339 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:25,339 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1654481137] [2020-07-21 01:05:25,339 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:25,389 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:25,390 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:25,391 INFO L263 TraceCheckSpWp]: Trace formula consists of 122 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:25,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:25,408 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 01:05:25,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:25,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1654481137] [2020-07-21 01:05:25,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:25,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:25,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1756844957] [2020-07-21 01:05:25,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:25,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:25,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:25,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:25,412 INFO L87 Difference]: Start difference. First operand 2120 states and 3142 transitions. Second operand 3 states. [2020-07-21 01:05:25,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:25,490 INFO L93 Difference]: Finished difference Result 3724 states and 5640 transitions. [2020-07-21 01:05:25,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:25,492 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 01:05:25,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:25,519 INFO L225 Difference]: With dead ends: 3724 [2020-07-21 01:05:25,519 INFO L226 Difference]: Without dead ends: 3722 [2020-07-21 01:05:25,523 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 01:05:25,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3722 states. [2020-07-21 01:05:25,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3722 to 3080. [2020-07-21 01:05:25,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 3080 states. [2020-07-21 01:05:25,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3080 states to 3080 states and 4422 transitions. [2020-07-21 01:05:25,684 INFO L78 Accepts]: Start accepts. Automaton has 3080 states and 4422 transitions. Word has length 27 [2020-07-21 01:05:25,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:25,685 INFO L479 AbstractCegarLoop]: Abstraction has 3080 states and 4422 transitions. [2020-07-21 01:05:25,685 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:25,685 INFO L276 IsEmpty]: Start isEmpty. Operand 3080 states and 4422 transitions. [2020-07-21 01:05:25,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:05:25,694 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:25,694 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, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:25,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:25,910 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:25,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:25,911 INFO L82 PathProgramCache]: Analyzing trace with hash 308153559, now seen corresponding path program 1 times [2020-07-21 01:05:25,912 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:25,912 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1977736848] [2020-07-21 01:05:25,913 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:25,980 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:25,980 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:25,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:25,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:25,995 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 01:05:25,995 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:25,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1977736848] [2020-07-21 01:05:25,996 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:25,996 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:25,996 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222473090] [2020-07-21 01:05:25,997 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:25,998 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:25,998 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:25,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:25,998 INFO L87 Difference]: Start difference. First operand 3080 states and 4422 transitions. Second operand 3 states. [2020-07-21 01:05:26,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:26,106 INFO L93 Difference]: Finished difference Result 7116 states and 10248 transitions. [2020-07-21 01:05:26,107 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:26,107 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 27 [2020-07-21 01:05:26,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:26,143 INFO L225 Difference]: With dead ends: 7116 [2020-07-21 01:05:26,143 INFO L226 Difference]: Without dead ends: 4106 [2020-07-21 01:05:26,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 25 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 01:05:26,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4106 states. [2020-07-21 01:05:26,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4106 to 4104. [2020-07-21 01:05:26,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4104 states. [2020-07-21 01:05:26,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4104 states to 4104 states and 5830 transitions. [2020-07-21 01:05:26,337 INFO L78 Accepts]: Start accepts. Automaton has 4104 states and 5830 transitions. Word has length 27 [2020-07-21 01:05:26,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:26,338 INFO L479 AbstractCegarLoop]: Abstraction has 4104 states and 5830 transitions. [2020-07-21 01:05:26,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:26,338 INFO L276 IsEmpty]: Start isEmpty. Operand 4104 states and 5830 transitions. [2020-07-21 01:05:26,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 01:05:26,347 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:26,347 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, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:26,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:26,562 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:26,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:26,563 INFO L82 PathProgramCache]: Analyzing trace with hash -2052062779, now seen corresponding path program 1 times [2020-07-21 01:05:26,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:26,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [936608408] [2020-07-21 01:05:26,564 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:26,618 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:26,618 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:26,620 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:26,622 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:26,637 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 01:05:26,637 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:26,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [936608408] [2020-07-21 01:05:26,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:26,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:26,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821142252] [2020-07-21 01:05:26,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:26,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:26,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:26,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:26,640 INFO L87 Difference]: Start difference. First operand 4104 states and 5830 transitions. Second operand 3 states. [2020-07-21 01:05:26,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:26,757 INFO L93 Difference]: Finished difference Result 6156 states and 8712 transitions. [2020-07-21 01:05:26,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:26,758 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 01:05:26,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:26,820 INFO L225 Difference]: With dead ends: 6156 [2020-07-21 01:05:26,820 INFO L226 Difference]: Without dead ends: 4170 [2020-07-21 01:05:26,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 01:05:26,843 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4170 states. [2020-07-21 01:05:27,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4170 to 4168. [2020-07-21 01:05:27,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 4168 states. [2020-07-21 01:05:27,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4168 states to 4168 states and 5830 transitions. [2020-07-21 01:05:27,119 INFO L78 Accepts]: Start accepts. Automaton has 4168 states and 5830 transitions. Word has length 28 [2020-07-21 01:05:27,119 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:27,119 INFO L479 AbstractCegarLoop]: Abstraction has 4168 states and 5830 transitions. [2020-07-21 01:05:27,119 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:27,123 INFO L276 IsEmpty]: Start isEmpty. Operand 4168 states and 5830 transitions. [2020-07-21 01:05:27,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 01:05:27,133 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:27,133 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, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:27,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:27,347 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:27,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:27,348 INFO L82 PathProgramCache]: Analyzing trace with hash 963040839, now seen corresponding path program 1 times [2020-07-21 01:05:27,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:27,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [35880922] [2020-07-21 01:05:27,349 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:27,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:27,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:27,406 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:27,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:27,426 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 01:05:27,432 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:27,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [35880922] [2020-07-21 01:05:27,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:27,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:27,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1383524046] [2020-07-21 01:05:27,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:27,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:27,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:27,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:27,437 INFO L87 Difference]: Start difference. First operand 4168 states and 5830 transitions. Second operand 3 states. [2020-07-21 01:05:27,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:27,610 INFO L93 Difference]: Finished difference Result 12108 states and 16712 transitions. [2020-07-21 01:05:27,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:27,611 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 01:05:27,611 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:27,639 INFO L225 Difference]: With dead ends: 12108 [2020-07-21 01:05:27,640 INFO L226 Difference]: Without dead ends: 8074 [2020-07-21 01:05:27,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 01:05:27,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8074 states. [2020-07-21 01:05:27,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8074 to 8072. [2020-07-21 01:05:27,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 01:05:28,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10886 transitions. [2020-07-21 01:05:28,042 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10886 transitions. Word has length 28 [2020-07-21 01:05:28,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:28,043 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10886 transitions. [2020-07-21 01:05:28,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:28,044 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10886 transitions. [2020-07-21 01:05:28,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-21 01:05:28,067 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:28,067 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, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:28,281 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:28,281 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:28,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:28,283 INFO L82 PathProgramCache]: Analyzing trace with hash 1974158089, now seen corresponding path program 1 times [2020-07-21 01:05:28,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:28,284 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1112624999] [2020-07-21 01:05:28,285 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:28,357 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:28,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:28,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:28,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:28,372 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 01:05:28,373 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:28,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1112624999] [2020-07-21 01:05:28,374 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:28,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:28,375 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [597405795] [2020-07-21 01:05:28,375 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:28,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:28,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:28,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:28,377 INFO L87 Difference]: Start difference. First operand 8072 states and 10886 transitions. Second operand 3 states. [2020-07-21 01:05:28,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:28,754 INFO L93 Difference]: Finished difference Result 9100 states and 12680 transitions. [2020-07-21 01:05:28,755 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:28,755 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 28 [2020-07-21 01:05:28,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:28,794 INFO L225 Difference]: With dead ends: 9100 [2020-07-21 01:05:28,794 INFO L226 Difference]: Without dead ends: 9098 [2020-07-21 01:05:28,801 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 26 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 01:05:28,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9098 states. [2020-07-21 01:05:29,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9098 to 8072. [2020-07-21 01:05:29,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8072 states. [2020-07-21 01:05:29,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8072 states to 8072 states and 10758 transitions. [2020-07-21 01:05:29,227 INFO L78 Accepts]: Start accepts. Automaton has 8072 states and 10758 transitions. Word has length 28 [2020-07-21 01:05:29,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:29,227 INFO L479 AbstractCegarLoop]: Abstraction has 8072 states and 10758 transitions. [2020-07-21 01:05:29,228 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:29,228 INFO L276 IsEmpty]: Start isEmpty. Operand 8072 states and 10758 transitions. [2020-07-21 01:05:29,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 01:05:29,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:29,250 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:29,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:29,464 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:29,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:29,466 INFO L82 PathProgramCache]: Analyzing trace with hash -210289620, now seen corresponding path program 1 times [2020-07-21 01:05:29,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:29,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1998295822] [2020-07-21 01:05:29,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:29,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:29,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:29,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:29,540 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:29,551 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 01:05:29,552 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:29,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1998295822] [2020-07-21 01:05:29,552 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:29,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:29,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1710019138] [2020-07-21 01:05:29,554 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:29,555 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:29,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:29,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:29,557 INFO L87 Difference]: Start difference. First operand 8072 states and 10758 transitions. Second operand 3 states. [2020-07-21 01:05:29,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:29,906 INFO L93 Difference]: Finished difference Result 13708 states and 18568 transitions. [2020-07-21 01:05:29,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:29,908 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 01:05:29,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:29,973 INFO L225 Difference]: With dead ends: 13708 [2020-07-21 01:05:29,973 INFO L226 Difference]: Without dead ends: 13706 [2020-07-21 01:05:29,986 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 01:05:30,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13706 states. [2020-07-21 01:05:30,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13706 to 12168. [2020-07-21 01:05:30,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12168 states. [2020-07-21 01:05:30,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12168 states to 12168 states and 15750 transitions. [2020-07-21 01:05:30,629 INFO L78 Accepts]: Start accepts. Automaton has 12168 states and 15750 transitions. Word has length 29 [2020-07-21 01:05:30,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:30,629 INFO L479 AbstractCegarLoop]: Abstraction has 12168 states and 15750 transitions. [2020-07-21 01:05:30,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:30,629 INFO L276 IsEmpty]: Start isEmpty. Operand 12168 states and 15750 transitions. [2020-07-21 01:05:30,667 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-07-21 01:05:30,668 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:30,668 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, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:30,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:30,883 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:30,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:30,884 INFO L82 PathProgramCache]: Analyzing trace with hash -1221406870, now seen corresponding path program 1 times [2020-07-21 01:05:30,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:30,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1479086716] [2020-07-21 01:05:30,884 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:30,931 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:30,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:30,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:30,937 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:30,946 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 01:05:30,947 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:30,948 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1479086716] [2020-07-21 01:05:30,948 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:30,948 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:30,948 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895101622] [2020-07-21 01:05:30,949 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:30,949 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:30,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:30,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:30,950 INFO L87 Difference]: Start difference. First operand 12168 states and 15750 transitions. Second operand 3 states. [2020-07-21 01:05:31,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:31,237 INFO L93 Difference]: Finished difference Result 27788 states and 35976 transitions. [2020-07-21 01:05:31,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:31,829 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 29 [2020-07-21 01:05:31,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:31,884 INFO L225 Difference]: With dead ends: 27788 [2020-07-21 01:05:31,885 INFO L226 Difference]: Without dead ends: 15754 [2020-07-21 01:05:31,920 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 27 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 01:05:31,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15754 states. [2020-07-21 01:05:32,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15754 to 15752. [2020-07-21 01:05:32,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15752 states. [2020-07-21 01:05:32,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15752 states to 15752 states and 19974 transitions. [2020-07-21 01:05:32,417 INFO L78 Accepts]: Start accepts. Automaton has 15752 states and 19974 transitions. Word has length 29 [2020-07-21 01:05:32,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:32,417 INFO L479 AbstractCegarLoop]: Abstraction has 15752 states and 19974 transitions. [2020-07-21 01:05:32,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:32,418 INFO L276 IsEmpty]: Start isEmpty. Operand 15752 states and 19974 transitions. [2020-07-21 01:05:32,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 01:05:32,449 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:32,449 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:32,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:32,663 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:32,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:32,664 INFO L82 PathProgramCache]: Analyzing trace with hash 2071172156, now seen corresponding path program 1 times [2020-07-21 01:05:32,664 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:32,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2069333454] [2020-07-21 01:05:32,665 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:32,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:32,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:32,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:32,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:32,733 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 01:05:32,734 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:32,734 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2069333454] [2020-07-21 01:05:32,734 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:32,734 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:32,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [807088468] [2020-07-21 01:05:32,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:32,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:32,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:32,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:32,737 INFO L87 Difference]: Start difference. First operand 15752 states and 19974 transitions. Second operand 3 states. [2020-07-21 01:05:33,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:33,085 INFO L93 Difference]: Finished difference Result 23820 states and 30216 transitions. [2020-07-21 01:05:33,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:33,085 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 01:05:33,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:33,132 INFO L225 Difference]: With dead ends: 23820 [2020-07-21 01:05:33,132 INFO L226 Difference]: Without dead ends: 16138 [2020-07-21 01:05:33,159 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 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 01:05:33,184 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16138 states. [2020-07-21 01:05:33,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16138 to 16136. [2020-07-21 01:05:33,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16136 states. [2020-07-21 01:05:33,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16136 states to 16136 states and 20230 transitions. [2020-07-21 01:05:33,644 INFO L78 Accepts]: Start accepts. Automaton has 16136 states and 20230 transitions. Word has length 30 [2020-07-21 01:05:33,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:33,645 INFO L479 AbstractCegarLoop]: Abstraction has 16136 states and 20230 transitions. [2020-07-21 01:05:33,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:33,645 INFO L276 IsEmpty]: Start isEmpty. Operand 16136 states and 20230 transitions. [2020-07-21 01:05:33,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 01:05:33,676 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:33,677 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:33,891 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:33,893 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:33,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:33,893 INFO L82 PathProgramCache]: Analyzing trace with hash 791308478, now seen corresponding path program 1 times [2020-07-21 01:05:33,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:33,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1907958943] [2020-07-21 01:05:33,894 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:33,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:33,963 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:33,965 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:33,967 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:33,987 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 01:05:33,987 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:33,988 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1907958943] [2020-07-21 01:05:33,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:33,989 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:33,989 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813157954] [2020-07-21 01:05:33,990 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:33,990 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:33,991 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:33,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:33,992 INFO L87 Difference]: Start difference. First operand 16136 states and 20230 transitions. Second operand 3 states. [2020-07-21 01:05:34,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:34,536 INFO L93 Difference]: Finished difference Result 26636 states and 33544 transitions. [2020-07-21 01:05:34,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:34,537 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 01:05:34,537 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:34,641 INFO L225 Difference]: With dead ends: 26636 [2020-07-21 01:05:34,642 INFO L226 Difference]: Without dead ends: 26634 [2020-07-21 01:05:34,654 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 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 01:05:34,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26634 states. [2020-07-21 01:05:35,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26634 to 24584. [2020-07-21 01:05:35,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24584 states. [2020-07-21 01:05:35,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24584 states to 24584 states and 29958 transitions. [2020-07-21 01:05:35,550 INFO L78 Accepts]: Start accepts. Automaton has 24584 states and 29958 transitions. Word has length 30 [2020-07-21 01:05:35,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:35,551 INFO L479 AbstractCegarLoop]: Abstraction has 24584 states and 29958 transitions. [2020-07-21 01:05:35,551 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:35,551 INFO L276 IsEmpty]: Start isEmpty. Operand 24584 states and 29958 transitions. [2020-07-21 01:05:35,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-07-21 01:05:35,647 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:35,647 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, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:35,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:35,863 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:35,864 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:35,865 INFO L82 PathProgramCache]: Analyzing trace with hash -219808772, now seen corresponding path program 1 times [2020-07-21 01:05:35,865 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:35,865 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [123309815] [2020-07-21 01:05:35,866 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:35,937 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:35,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:35,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:35,942 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:35,955 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 01:05:35,956 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:35,957 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [123309815] [2020-07-21 01:05:35,957 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:35,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:35,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [759207823] [2020-07-21 01:05:35,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:35,960 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:35,960 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:35,961 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:35,961 INFO L87 Difference]: Start difference. First operand 24584 states and 29958 transitions. Second operand 3 states. [2020-07-21 01:05:36,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:36,918 INFO L93 Difference]: Finished difference Result 55308 states and 66824 transitions. [2020-07-21 01:05:36,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:36,918 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 30 [2020-07-21 01:05:36,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:37,059 INFO L225 Difference]: With dead ends: 55308 [2020-07-21 01:05:37,060 INFO L226 Difference]: Without dead ends: 31242 [2020-07-21 01:05:37,138 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 28 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 01:05:37,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31242 states. [2020-07-21 01:05:38,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31242 to 31240. [2020-07-21 01:05:38,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31240 states. [2020-07-21 01:05:38,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31240 states to 31240 states and 36870 transitions. [2020-07-21 01:05:38,455 INFO L78 Accepts]: Start accepts. Automaton has 31240 states and 36870 transitions. Word has length 30 [2020-07-21 01:05:38,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:38,455 INFO L479 AbstractCegarLoop]: Abstraction has 31240 states and 36870 transitions. [2020-07-21 01:05:38,455 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:38,456 INFO L276 IsEmpty]: Start isEmpty. Operand 31240 states and 36870 transitions. [2020-07-21 01:05:38,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:05:38,529 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:38,530 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:38,743 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:38,744 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:38,744 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:38,745 INFO L82 PathProgramCache]: Analyzing trace with hash -1239024833, now seen corresponding path program 1 times [2020-07-21 01:05:38,745 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:38,745 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [817079831] [2020-07-21 01:05:38,745 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:38,804 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:38,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:38,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:38,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:38,820 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 01:05:38,821 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:38,821 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [817079831] [2020-07-21 01:05:38,821 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:38,821 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:38,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [242819055] [2020-07-21 01:05:38,822 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:38,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:38,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:38,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:38,823 INFO L87 Difference]: Start difference. First operand 31240 states and 36870 transitions. Second operand 3 states. [2020-07-21 01:05:39,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:39,314 INFO L93 Difference]: Finished difference Result 46860 states and 55048 transitions. [2020-07-21 01:05:39,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:39,315 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 01:05:39,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:39,467 INFO L225 Difference]: With dead ends: 46860 [2020-07-21 01:05:39,468 INFO L226 Difference]: Without dead ends: 31754 [2020-07-21 01:05:39,528 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 01:05:39,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31754 states. [2020-07-21 01:05:41,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31754 to 31752. [2020-07-21 01:05:41,659 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31752 states. [2020-07-21 01:05:41,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31752 states to 31752 states and 36870 transitions. [2020-07-21 01:05:41,784 INFO L78 Accepts]: Start accepts. Automaton has 31752 states and 36870 transitions. Word has length 31 [2020-07-21 01:05:41,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:41,785 INFO L479 AbstractCegarLoop]: Abstraction has 31752 states and 36870 transitions. [2020-07-21 01:05:41,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:41,785 INFO L276 IsEmpty]: Start isEmpty. Operand 31752 states and 36870 transitions. [2020-07-21 01:05:41,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:05:41,833 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:41,833 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:42,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:42,048 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:42,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:42,049 INFO L82 PathProgramCache]: Analyzing trace with hash 1776078785, now seen corresponding path program 1 times [2020-07-21 01:05:42,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:42,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [899274534] [2020-07-21 01:05:42,050 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:42,118 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:42,119 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:42,121 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:42,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:42,135 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 01:05:42,135 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:42,136 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [899274534] [2020-07-21 01:05:42,136 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:42,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:42,137 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086422899] [2020-07-21 01:05:42,138 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:42,138 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:42,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:42,139 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:42,139 INFO L87 Difference]: Start difference. First operand 31752 states and 36870 transitions. Second operand 3 states. [2020-07-21 01:05:42,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:42,922 INFO L93 Difference]: Finished difference Result 51210 states and 58887 transitions. [2020-07-21 01:05:42,923 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:42,930 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 01:05:42,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:43,134 INFO L225 Difference]: With dead ends: 51210 [2020-07-21 01:05:43,134 INFO L226 Difference]: Without dead ends: 51208 [2020-07-21 01:05:43,174 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 01:05:43,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51208 states. [2020-07-21 01:05:44,743 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51208 to 49160. [2020-07-21 01:05:44,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49160 states. [2020-07-21 01:05:44,929 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49160 states to 49160 states and 55814 transitions. [2020-07-21 01:05:44,930 INFO L78 Accepts]: Start accepts. Automaton has 49160 states and 55814 transitions. Word has length 31 [2020-07-21 01:05:44,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:44,930 INFO L479 AbstractCegarLoop]: Abstraction has 49160 states and 55814 transitions. [2020-07-21 01:05:44,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:44,931 INFO L276 IsEmpty]: Start isEmpty. Operand 49160 states and 55814 transitions. [2020-07-21 01:05:45,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 01:05:45,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:05:45,022 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:05:45,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:45,239 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:05:45,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:05:45,240 INFO L82 PathProgramCache]: Analyzing trace with hash 764961535, now seen corresponding path program 1 times [2020-07-21 01:05:45,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:05:45,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950916994] [2020-07-21 01:05:45,241 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:45,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:05:45,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:05:45,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 01:05:45,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:05:45,329 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 01:05:45,330 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:05:45,330 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950916994] [2020-07-21 01:05:45,330 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:05:45,331 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:05:45,331 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [100231742] [2020-07-21 01:05:45,332 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:05:45,332 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:05:45,332 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:05:45,332 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:05:45,332 INFO L87 Difference]: Start difference. First operand 49160 states and 55814 transitions. Second operand 3 states. [2020-07-21 01:05:47,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:05:47,158 INFO L93 Difference]: Finished difference Result 109576 states and 122374 transitions. [2020-07-21 01:05:47,159 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:05:47,159 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 31 [2020-07-21 01:05:47,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:05:47,160 INFO L225 Difference]: With dead ends: 109576 [2020-07-21 01:05:47,161 INFO L226 Difference]: Without dead ends: 0 [2020-07-21 01:05:47,366 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 01:05:47,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-07-21 01:05:47,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-07-21 01:05:47,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-07-21 01:05:47,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-07-21 01:05:47,369 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 31 [2020-07-21 01:05:47,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:05:47,369 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-07-21 01:05:47,369 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:05:47,370 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-07-21 01:05:47,370 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-07-21 01:05:47,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:05:47,590 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-07-21 01:05:47,727 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-07-21 01:05:47,727 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:05:47,727 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-07-21 01:05:47,728 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-07-21 01:05:47,728 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-07-21 01:05:47,728 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-07-21 01:05:47,728 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 4 177) no Hoare annotation was computed. [2020-07-21 01:05:47,730 INFO L268 CegarLoopResult]: For program point L118(line 118) no Hoare annotation was computed. [2020-07-21 01:05:47,731 INFO L268 CegarLoopResult]: For program point L143(line 143) no Hoare annotation was computed. [2020-07-21 01:05:47,731 INFO L268 CegarLoopResult]: For program point L44(lines 44 46) no Hoare annotation was computed. [2020-07-21 01:05:47,731 INFO L268 CegarLoopResult]: For program point L168(line 168) no Hoare annotation was computed. [2020-07-21 01:05:47,732 INFO L264 CegarLoopResult]: At program point L168-1(lines 5 177) the Hoare annotation is: false [2020-07-21 01:05:47,732 INFO L268 CegarLoopResult]: For program point L127-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,734 INFO L268 CegarLoopResult]: For program point L152-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,734 INFO L268 CegarLoopResult]: For program point L111-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,735 INFO L268 CegarLoopResult]: For program point L103-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,735 INFO L268 CegarLoopResult]: For program point L128(line 128) no Hoare annotation was computed. [2020-07-21 01:05:47,735 INFO L268 CegarLoopResult]: For program point L95-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,735 INFO L268 CegarLoopResult]: For program point L153(line 153) no Hoare annotation was computed. [2020-07-21 01:05:47,736 INFO L268 CegarLoopResult]: For program point L87-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,736 INFO L268 CegarLoopResult]: For program point L79-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,736 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 4 177) no Hoare annotation was computed. [2020-07-21 01:05:47,736 INFO L268 CegarLoopResult]: For program point L137-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,736 INFO L268 CegarLoopResult]: For program point L71(lines 71 73) no Hoare annotation was computed. [2020-07-21 01:05:47,737 INFO L268 CegarLoopResult]: For program point L71-2(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,737 INFO L268 CegarLoopResult]: For program point L162-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,737 INFO L268 CegarLoopResult]: For program point mainErr0ASSERT_VIOLATIONERROR_FUNCTION(line 175) no Hoare annotation was computed. [2020-07-21 01:05:47,738 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 4 177) the Hoare annotation is: true [2020-07-21 01:05:47,738 INFO L268 CegarLoopResult]: For program point L138(line 138) no Hoare annotation was computed. [2020-07-21 01:05:47,738 INFO L268 CegarLoopResult]: For program point L163(line 163) no Hoare annotation was computed. [2020-07-21 01:05:47,738 INFO L268 CegarLoopResult]: For program point L122-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,739 INFO L268 CegarLoopResult]: For program point L147-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,739 INFO L268 CegarLoopResult]: For program point L123(line 123) no Hoare annotation was computed. [2020-07-21 01:05:47,739 INFO L268 CegarLoopResult]: For program point L148(line 148) no Hoare annotation was computed. [2020-07-21 01:05:47,739 INFO L271 CegarLoopResult]: At program point L173(lines 5 177) the Hoare annotation is: true [2020-07-21 01:05:47,740 INFO L268 CegarLoopResult]: For program point L107-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,740 INFO L268 CegarLoopResult]: For program point L132-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,740 INFO L268 CegarLoopResult]: For program point L99-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,740 INFO L268 CegarLoopResult]: For program point L157-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,741 INFO L268 CegarLoopResult]: For program point L91-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,741 INFO L268 CegarLoopResult]: For program point L83-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,741 INFO L268 CegarLoopResult]: For program point L75-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,741 INFO L268 CegarLoopResult]: For program point L133(line 133) no Hoare annotation was computed. [2020-07-21 01:05:47,742 INFO L268 CegarLoopResult]: For program point L158(line 158) no Hoare annotation was computed. [2020-07-21 01:05:47,742 INFO L268 CegarLoopResult]: For program point L117-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,742 INFO L268 CegarLoopResult]: For program point L142-1(lines 42 172) no Hoare annotation was computed. [2020-07-21 01:05:47,742 INFO L271 CegarLoopResult]: At program point L167-1(lines 42 172) the Hoare annotation is: true [2020-07-21 01:05:47,772 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.07 01:05:47 BoogieIcfgContainer [2020-07-21 01:05:47,772 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-21 01:05:47,777 INFO L168 Benchmark]: Toolchain (without parser) took 32064.09 ms. Allocated memory was 135.8 MB in the beginning and 996.1 MB in the end (delta: 860.4 MB). Free memory was 100.6 MB in the beginning and 601.9 MB in the end (delta: -501.3 MB). Peak memory consumption was 359.0 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,788 INFO L168 Benchmark]: CDTParser took 1.61 ms. Allocated memory is still 135.8 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,789 INFO L168 Benchmark]: CACSL2BoogieTranslator took 431.26 ms. Allocated memory is still 135.8 MB. Free memory was 100.2 MB in the beginning and 89.3 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,790 INFO L168 Benchmark]: Boogie Preprocessor took 243.93 ms. Allocated memory was 135.8 MB in the beginning and 203.4 MB in the end (delta: 67.6 MB). Free memory was 89.3 MB in the beginning and 181.3 MB in the end (delta: -92.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,790 INFO L168 Benchmark]: RCFGBuilder took 621.46 ms. Allocated memory is still 203.4 MB. Free memory was 180.6 MB in the beginning and 160.4 MB in the end (delta: 20.2 MB). Peak memory consumption was 20.2 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,791 INFO L168 Benchmark]: TraceAbstraction took 30756.03 ms. Allocated memory was 203.4 MB in the beginning and 996.1 MB in the end (delta: 792.7 MB). Free memory was 160.4 MB in the beginning and 601.9 MB in the end (delta: -441.5 MB). Peak memory consumption was 351.3 MB. Max. memory is 7.1 GB. [2020-07-21 01:05:47,794 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.61 ms. Allocated memory is still 135.8 MB. Free memory was 118.8 MB in the beginning and 118.6 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 431.26 ms. Allocated memory is still 135.8 MB. Free memory was 100.2 MB in the beginning and 89.3 MB in the end (delta: 10.9 MB). Peak memory consumption was 10.9 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 243.93 ms. Allocated memory was 135.8 MB in the beginning and 203.4 MB in the end (delta: 67.6 MB). Free memory was 89.3 MB in the beginning and 181.3 MB in the end (delta: -92.0 MB). Peak memory consumption was 13.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 621.46 ms. Allocated memory is still 203.4 MB. Free memory was 180.6 MB in the beginning and 160.4 MB in the end (delta: 20.2 MB). Peak memory consumption was 20.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 30756.03 ms. Allocated memory was 203.4 MB in the beginning and 996.1 MB in the end (delta: 792.7 MB). Free memory was 160.4 MB in the beginning and 601.9 MB in the end (delta: -441.5 MB). Peak memory consumption was 351.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 175]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 0 - InvariantResult [Line: 5]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 47 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 30.4s, OverallIterations: 31, TraceHistogramMax: 1, AutomataDifference: 9.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 2877 SDtfs, 1405 SDslu, 1967 SDs, 0 SdLazy, 165 SolverSat, 31 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 777 GetRequests, 746 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49160occurred in iteration=30, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 10.0s AutomataMinimizationTime, 31 MinimizatonAttempts, 8224 StatesRemovedByMinimization, 30 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 2058 NumberOfFragments, 7 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.2s SsaConstructionTime, 1.0s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 808 NumberOfCodeBlocks, 808 NumberOfCodeBlocksAsserted, 124 NumberOfCheckSat, 777 ConstructedInterpolants, 0 QuantifiedInterpolants, 39912 SizeOfPredicates, 0 NumberOfNonLiveVariables, 3761 ConjunctsInSsa, 93 ConjunctsInUnsatCore, 31 InterpolantComputations, 31 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...