/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/loop-acceleration/const_1-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 23:12:20,302 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 23:12:20,308 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 23:12:20,330 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 23:12:20,331 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 23:12:20,334 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 23:12:20,336 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 23:12:20,352 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 23:12:20,355 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 23:12:20,359 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 23:12:20,361 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 23:12:20,363 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 23:12:20,364 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 23:12:20,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 23:12:20,368 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 23:12:20,370 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 23:12:20,373 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 23:12:20,378 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 23:12:20,381 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 23:12:20,383 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 23:12:20,388 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 23:12:20,393 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 23:12:20,394 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 23:12:20,398 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 23:12:20,402 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 23:12:20,419 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 23:12:20,420 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 23:12:20,422 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 23:12:20,423 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 23:12:20,451 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 23:12:20,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 23:12:20,454 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 23:12:20,454 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 23:12:20,454 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 23:12:20,455 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 23:12:20,455 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 23:12:20,455 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 23:12:20,455 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 23:12:20,455 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 23:12:20,457 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 23:12:20,457 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 23:12:20,457 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 23:12:20,458 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 23:12:20,458 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 23:12:20,458 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 23:12:20,458 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 23:12:20,459 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 23:12:20,459 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 23:12:20,459 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 23:12:20,459 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 23:12:20,460 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 23:12:20,460 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 23:12:20,461 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 23:12:20,461 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 23:12:20,461 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 23:12:20,462 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:20,462 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 23:12:20,462 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 23:12:20,462 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 23:12:20,761 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 23:12:20,775 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 23:12:20,778 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 23:12:20,780 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 23:12:20,780 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 23:12:20,781 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-21 23:12:20,854 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e11300894/94ac4ac5ef6a4fd9b971f3f5be68576f/FLAG130bd5809 [2020-07-21 23:12:21,290 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 23:12:21,292 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/const_1-1.c [2020-07-21 23:12:21,302 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e11300894/94ac4ac5ef6a4fd9b971f3f5be68576f/FLAG130bd5809 [2020-07-21 23:12:21,669 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e11300894/94ac4ac5ef6a4fd9b971f3f5be68576f [2020-07-21 23:12:21,680 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 23:12:21,684 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 23:12:21,685 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:21,685 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 23:12:21,689 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 23:12:21,690 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,693 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@762058d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21, skipping insertion in model container [2020-07-21 23:12:21,694 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,702 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 23:12:21,722 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 23:12:21,900 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:21,905 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 23:12:21,920 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 23:12:21,936 INFO L208 MainTranslator]: Completed translation [2020-07-21 23:12:21,937 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21 WrapperNode [2020-07-21 23:12:21,937 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 23:12:21,938 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 23:12:21,938 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 23:12:21,938 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 23:12:21,953 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,953 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,958 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,959 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,963 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,968 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:21,969 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (1/1) ... [2020-07-21 23:12:22,052 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 23:12:22,052 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 23:12:22,053 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 23:12:22,053 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 23:12:22,054 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (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 23:12:22,123 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 23:12:22,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 23:12:22,124 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 23:12:22,124 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 23:12:22,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 23:12:22,124 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 23:12:22,124 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 23:12:22,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 23:12:22,125 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 23:12:22,300 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 23:12:22,300 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 23:12:22,304 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:22 BoogieIcfgContainer [2020-07-21 23:12:22,304 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 23:12:22,306 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 23:12:22,306 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 23:12:22,309 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 23:12:22,310 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:12:21" (1/3) ... [2020-07-21 23:12:22,310 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5459cc94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:22, skipping insertion in model container [2020-07-21 23:12:22,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:12:21" (2/3) ... [2020-07-21 23:12:22,311 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5459cc94 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:12:22, skipping insertion in model container [2020-07-21 23:12:22,311 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:12:22" (3/3) ... [2020-07-21 23:12:22,313 INFO L109 eAbstractionObserver]: Analyzing ICFG const_1-1.c [2020-07-21 23:12:22,324 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 23:12:22,330 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 23:12:22,342 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 23:12:22,366 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 23:12:22,366 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 23:12:22,366 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 23:12:22,367 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 23:12:22,367 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 23:12:22,367 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 23:12:22,367 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 23:12:22,367 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 23:12:22,384 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 23:12:22,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 23:12:22,389 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:22,390 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:22,390 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:22,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:22,395 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-21 23:12:22,402 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:22,403 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [921166204] [2020-07-21 23:12:22,403 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 23:12:22,464 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 23:12:22,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:22,467 INFO L263 TraceCheckSpWp]: Trace formula consists of 15 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 23:12:22,473 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:22,526 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 23:12:22,526 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 23:12:22,527 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [921166204] [2020-07-21 23:12:22,528 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 23:12:22,528 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 23:12:22,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923468052] [2020-07-21 23:12:22,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 23:12:22,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:22,556 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 23:12:22,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 23:12:22,560 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-21 23:12:22,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:22,609 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 23:12:22,610 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 23:12:22,612 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 23:12:22,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:22,621 INFO L225 Difference]: With dead ends: 29 [2020-07-21 23:12:22,622 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 23:12:22,626 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 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 23:12:22,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 23:12:22,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 23:12:22,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 23:12:22,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 23:12:22,686 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 23:12:22,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:22,687 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 23:12:22,687 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 23:12:22,687 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 23:12:22,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 23:12:22,688 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:22,688 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:22,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:22,902 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:22,903 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:22,903 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-21 23:12:22,904 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:22,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465250394] [2020-07-21 23:12:22,906 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 23:12:22,965 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:22,965 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:22,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 26 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 23:12:22,968 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:22,989 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:22,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:23,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:23,045 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465250394] [2020-07-21 23:12:23,046 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:23,046 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 23:12:23,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [932563393] [2020-07-21 23:12:23,049 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 23:12:23,049 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:23,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 23:12:23,050 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 23:12:23,050 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-21 23:12:23,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:23,142 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 23:12:23,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 23:12:23,143 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 23:12:23,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:23,144 INFO L225 Difference]: With dead ends: 20 [2020-07-21 23:12:23,145 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 23:12:23,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-21 23:12:23,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 23:12:23,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 23:12:23,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 23:12:23,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 23:12:23,152 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-21 23:12:23,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:23,153 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 23:12:23,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 23:12:23,153 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 23:12:23,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 23:12:23,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:23,154 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:23,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:23,368 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:23,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:23,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-21 23:12:23,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:23,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1789705735] [2020-07-21 23:12:23,372 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 23:12:23,408 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 23:12:23,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:23,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 41 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 23:12:23,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:23,487 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:23,488 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:23,646 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:23,646 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1789705735] [2020-07-21 23:12:23,647 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:23,647 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 23:12:23,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [501334621] [2020-07-21 23:12:23,648 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 23:12:23,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:23,649 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 23:12:23,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-21 23:12:23,650 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 23:12:23,852 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 23:12:26,320 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification that was a NOOP. DAG size: 11 [2020-07-21 23:12:26,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:26,352 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-21 23:12:26,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 23:12:26,356 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 23:12:26,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:26,357 INFO L225 Difference]: With dead ends: 26 [2020-07-21 23:12:26,357 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 23:12:26,358 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=94, Invalid=146, Unknown=0, NotChecked=0, Total=240 [2020-07-21 23:12:26,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 23:12:26,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 23:12:26,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 23:12:26,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 23:12:26,365 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 23:12:26,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:26,366 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 23:12:26,366 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 23:12:26,366 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 23:12:26,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 23:12:26,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:26,367 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:26,573 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:26,574 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:26,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:26,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-21 23:12:26,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:26,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571681550] [2020-07-21 23:12:26,576 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 23:12:26,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:26,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:26,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 23:12:26,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:26,757 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:26,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:12:31,438 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 53 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:31,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571681550] [2020-07-21 23:12:31,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:12:31,439 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 23:12:31,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966772454] [2020-07-21 23:12:31,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 23:12:31,440 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:12:31,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 23:12:31,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=384, Unknown=2, NotChecked=0, Total=552 [2020-07-21 23:12:31,442 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-21 23:12:32,022 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 23:12:35,065 WARN L193 SmtUtils]: Spent 2.38 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 23:12:35,502 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 23:12:38,315 WARN L193 SmtUtils]: Spent 2.30 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 23:12:39,028 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 23:12:41,925 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-21 23:12:46,330 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-21 23:12:52,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:12:52,847 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-21 23:12:52,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-21 23:12:52,853 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-21 23:12:52,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:12:52,854 INFO L225 Difference]: With dead ends: 38 [2020-07-21 23:12:52,855 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 23:12:52,856 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 25.9s TimeCoverageRelationStatistics Valid=406, Invalid=714, Unknown=2, NotChecked=0, Total=1122 [2020-07-21 23:12:52,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 23:12:52,862 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 23:12:52,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 23:12:52,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 23:12:52,865 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 23:12:52,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:12:52,866 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 23:12:52,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 23:12:52,866 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 23:12:52,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 23:12:52,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:12:52,867 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:12:53,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:12:53,069 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:12:53,069 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:12:53,070 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-21 23:12:53,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:12:53,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366239747] [2020-07-21 23:12:53,071 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 23:12:53,121 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:12:53,121 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:12:53,124 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 23:12:53,126 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:12:53,504 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:12:53,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:13:28,554 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 243 refuted. 10 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:13:28,555 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366239747] [2020-07-21 23:13:28,555 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:13:28,555 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 23:13:28,555 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [143842247] [2020-07-21 23:13:28,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 23:13:28,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:13:28,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 23:13:28,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1618, Unknown=16, NotChecked=0, Total=2256 [2020-07-21 23:13:28,558 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 48 states. [2020-07-21 23:13:34,230 WARN L193 SmtUtils]: Spent 3.89 s on a formula simplification. DAG size of input: 116 DAG size of output: 11 [2020-07-21 23:13:37,642 WARN L193 SmtUtils]: Spent 1.61 s on a formula simplification. DAG size of input: 111 DAG size of output: 11 [2020-07-21 23:13:46,779 WARN L193 SmtUtils]: Spent 5.30 s on a formula simplification. DAG size of input: 106 DAG size of output: 11 [2020-07-21 23:13:52,969 WARN L193 SmtUtils]: Spent 4.23 s on a formula simplification. DAG size of input: 101 DAG size of output: 11 [2020-07-21 23:14:00,555 WARN L193 SmtUtils]: Spent 1.94 s on a formula simplification. DAG size of input: 96 DAG size of output: 11 [2020-07-21 23:14:11,462 WARN L193 SmtUtils]: Spent 3.53 s on a formula simplification. DAG size of input: 91 DAG size of output: 11 [2020-07-21 23:14:18,728 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification. DAG size of input: 86 DAG size of output: 11 [2020-07-21 23:14:27,949 WARN L193 SmtUtils]: Spent 1.42 s on a formula simplification. DAG size of input: 81 DAG size of output: 11 [2020-07-21 23:14:39,908 WARN L193 SmtUtils]: Spent 849.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-21 23:14:49,690 WARN L193 SmtUtils]: Spent 542.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-21 23:15:01,271 WARN L193 SmtUtils]: Spent 702.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-21 23:15:13,923 WARN L193 SmtUtils]: Spent 431.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-21 23:15:27,183 WARN L193 SmtUtils]: Spent 2.66 s on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-21 23:15:37,152 WARN L193 SmtUtils]: Spent 2.88 s on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-21 23:15:51,412 WARN L193 SmtUtils]: Spent 3.12 s on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-21 23:15:56,311 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-21 23:16:01,053 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-21 23:16:13,247 WARN L193 SmtUtils]: Spent 2.19 s on a formula simplification. DAG size of input: 31 DAG size of output: 11 [2020-07-21 23:16:28,419 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 23:16:28,420 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-21 23:16:28,421 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-21 23:16:28,421 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 32 [2020-07-21 23:16:28,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 23:16:28,422 INFO L225 Difference]: With dead ends: 62 [2020-07-21 23:16:28,423 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 23:16:28,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 257 ImplicationChecksByTransitivity, 214.5s TimeCoverageRelationStatistics Valid=1675, Invalid=3129, Unknown=26, NotChecked=0, Total=4830 [2020-07-21 23:16:28,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 23:16:28,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 23:16:28,435 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 23:16:28,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 23:16:28,436 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 23:16:28,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 23:16:28,437 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 23:16:28,437 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 23:16:28,437 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 23:16:28,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 23:16:28,439 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 23:16:28,439 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 23:16:28,652 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 23:16:28,653 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 23:16:28,654 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 23:16:28,654 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 5 times [2020-07-21 23:16:28,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 23:16:28,655 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [267387166] [2020-07-21 23:16:28,655 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 23:16:28,738 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 23:16:28,739 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 23:16:28,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 254 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-21 23:16:28,745 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 23:16:30,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:16:30,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 23:18:26,961 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1046 refuted. 35 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 23:18:26,962 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [267387166] [2020-07-21 23:18:26,962 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 23:18:26,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49] total 96 [2020-07-21 23:18:26,963 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1715995547] [2020-07-21 23:18:26,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 96 states [2020-07-21 23:18:26,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 23:18:26,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 96 interpolants. [2020-07-21 23:18:26,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2398, Invalid=6670, Unknown=52, NotChecked=0, Total=9120 [2020-07-21 23:18:26,969 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 96 states. [2020-07-21 23:18:51,018 WARN L193 SmtUtils]: Spent 15.07 s on a formula simplification. DAG size of input: 236 DAG size of output: 11 [2020-07-21 23:19:10,976 WARN L193 SmtUtils]: Spent 6.26 s on a formula simplification. DAG size of input: 231 DAG size of output: 11 [2020-07-21 23:19:33,965 WARN L193 SmtUtils]: Spent 8.91 s on a formula simplification. DAG size of input: 226 DAG size of output: 11 [2020-07-21 23:20:12,042 WARN L193 SmtUtils]: Spent 15.29 s on a formula simplification. DAG size of input: 221 DAG size of output: 11 [2020-07-21 23:20:14,096 WARN L838 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~y~0 38) 4294967296) 1024) (< (mod (+ c_main_~y~0 31) 4294967296) 1024) (< (mod (+ c_main_~y~0 9) 4294967296) 1024) (< (mod (+ c_main_~y~0 22) 4294967296) 1024) (< (mod (+ c_main_~y~0 13) 4294967296) 1024) (< (mod (+ c_main_~y~0 3) 4294967296) 1024) (< (mod (+ c_main_~y~0 1) 4294967296) 1024) (< (mod (+ c_main_~y~0 17) 4294967296) 1024) (< (mod (+ c_main_~y~0 42) 4294967296) 1024) (< (mod (+ c_main_~y~0 20) 4294967296) 1024) (< (mod (+ c_main_~y~0 35) 4294967296) 1024) (< (mod (+ c_main_~y~0 34) 4294967296) 1024) (< (mod (+ c_main_~y~0 33) 4294967296) 1024) (< (mod (+ c_main_~y~0 23) 4294967296) 1024) (< (mod (+ c_main_~y~0 25) 4294967296) 1024) (< (mod (+ c_main_~y~0 2) 4294967296) 1024) (< (mod (+ c_main_~y~0 26) 4294967296) 1024) (< (mod (+ c_main_~y~0 18) 4294967296) 1024) (< (mod (+ c_main_~y~0 4) 4294967296) 1024) (< (mod (+ c_main_~y~0 30) 4294967296) 1024) (< (mod (+ c_main_~y~0 8) 4294967296) 1024) (< (mod (+ c_main_~y~0 37) 4294967296) 1024) (< (mod (+ c_main_~y~0 16) 4294967296) 1024) (< (mod (+ c_main_~y~0 24) 4294967296) 1024) (< (mod (+ c_main_~y~0 15) 4294967296) 1024) (< (mod (+ c_main_~y~0 39) 4294967296) 1024) (< (mod (+ c_main_~y~0 11) 4294967296) 1024) (< (mod (+ c_main_~y~0 29) 4294967296) 1024) (< (mod (+ c_main_~y~0 7) 4294967296) 1024) (< (mod (+ c_main_~y~0 41) 4294967296) 1024) (< (mod (+ c_main_~y~0 19) 4294967296) 1024) (< (mod (+ c_main_~y~0 14) 4294967296) 1024) (< (mod (+ c_main_~y~0 10) 4294967296) 1024) (< (mod (+ c_main_~y~0 27) 4294967296) 1024) (< (mod (+ c_main_~y~0 40) 4294967296) 1024) (< (mod (+ c_main_~y~0 5) 4294967296) 1024) (< (mod (+ c_main_~y~0 32) 4294967296) 1024) (< (mod (+ c_main_~y~0 28) 4294967296) 1024) (< (mod c_main_~y~0 4294967296) 1024) (< (mod (+ c_main_~y~0 21) 4294967296) 1024) (< (mod (+ c_main_~y~0 12) 4294967296) 1024) (< (mod (+ c_main_~y~0 6) 4294967296) 1024) (< (mod (+ c_main_~y~0 36) 4294967296) 1024)) is different from false [2020-07-21 23:20:51,702 WARN L193 SmtUtils]: Spent 12.13 s on a formula simplification. DAG size of input: 211 DAG size of output: 11 [2020-07-21 23:21:31,605 WARN L193 SmtUtils]: Spent 8.00 s on a formula simplification. DAG size of input: 206 DAG size of output: 11 [2020-07-21 23:22:12,130 WARN L193 SmtUtils]: Spent 11.27 s on a formula simplification. DAG size of input: 201 DAG size of output: 11 [2020-07-21 23:22:54,731 WARN L193 SmtUtils]: Spent 6.58 s on a formula simplification. DAG size of input: 196 DAG size of output: 11 [2020-07-21 23:23:41,810 WARN L193 SmtUtils]: Spent 7.20 s on a formula simplification. DAG size of input: 191 DAG size of output: 11 [2020-07-21 23:24:26,896 WARN L193 SmtUtils]: Spent 8.07 s on a formula simplification. DAG size of input: 186 DAG size of output: 11 [2020-07-21 23:25:06,613 WARN L193 SmtUtils]: Spent 9.53 s on a formula simplification. DAG size of input: 181 DAG size of output: 11 [2020-07-21 23:25:52,198 WARN L193 SmtUtils]: Spent 9.03 s on a formula simplification. DAG size of input: 176 DAG size of output: 11 [2020-07-21 23:26:51,895 WARN L193 SmtUtils]: Spent 8.79 s on a formula simplification. DAG size of input: 171 DAG size of output: 11