/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 22:32:27,376 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 22:32:27,379 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 22:32:27,393 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 22:32:27,393 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 22:32:27,394 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 22:32:27,396 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 22:32:27,398 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 22:32:27,400 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 22:32:27,401 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 22:32:27,402 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 22:32:27,404 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 22:32:27,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 22:32:27,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 22:32:27,406 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 22:32:27,408 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 22:32:27,409 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 22:32:27,410 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 22:32:27,412 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 22:32:27,414 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 22:32:27,415 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 22:32:27,417 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 22:32:27,418 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 22:32:27,419 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 22:32:27,422 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 22:32:27,431 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 22:32:27,432 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 22:32:27,433 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 22:32:27,433 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 [2020-07-20 22:32:27,449 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 22:32:27,449 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 22:32:27,450 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 22:32:27,450 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 22:32:27,451 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 22:32:27,451 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 22:32:27,451 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 22:32:27,451 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 22:32:27,452 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 22:32:27,452 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 22:32:27,452 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 22:32:27,452 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 22:32:27,452 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 22:32:27,453 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 22:32:27,453 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 22:32:27,453 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 22:32:27,453 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 22:32:27,453 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 22:32:27,454 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 22:32:27,454 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 22:32:27,454 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 22:32:27,454 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 22:32:27,454 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 22:32:27,455 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 22:32:27,455 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 22:32:27,455 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 22:32:27,455 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:27,455 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 22:32:27,456 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 22:32:27,456 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-20 22:32:27,771 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 22:32:27,791 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 22:32:27,798 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 22:32:27,799 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 22:32:27,801 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 22:32:27,803 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-07-20 22:32:27,889 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b4ec3a19/f4c1039a9a214ecf8f9834ce27684a09/FLAG0c470744e [2020-07-20 22:32:28,454 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 22:32:28,455 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-07-20 22:32:28,464 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b4ec3a19/f4c1039a9a214ecf8f9834ce27684a09/FLAG0c470744e [2020-07-20 22:32:28,810 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/3b4ec3a19/f4c1039a9a214ecf8f9834ce27684a09 [2020-07-20 22:32:28,823 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 22:32:28,827 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 22:32:28,828 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 22:32:28,828 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 22:32:28,832 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 22:32:28,834 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:32:28" (1/1) ... [2020-07-20 22:32:28,837 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e2313e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:28, skipping insertion in model container [2020-07-20 22:32:28,838 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 10:32:28" (1/1) ... [2020-07-20 22:32:28,847 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 22:32:28,874 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 22:32:29,183 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:32:29,190 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 22:32:29,218 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 22:32:29,239 INFO L208 MainTranslator]: Completed translation [2020-07-20 22:32:29,239 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29 WrapperNode [2020-07-20 22:32:29,239 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 22:32:29,240 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 22:32:29,240 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 22:32:29,241 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 22:32:29,258 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,260 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,266 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,267 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,351 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,363 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,364 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (1/1) ... [2020-07-20 22:32:29,373 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 22:32:29,374 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 22:32:29,374 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 22:32:29,374 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 22:32:29,378 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (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 [2020-07-20 22:32:29,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 22:32:29,448 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 22:32:29,449 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 22:32:29,449 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 22:32:29,449 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 22:32:29,450 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 22:32:29,450 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 22:32:29,451 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 22:32:29,451 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 22:32:29,451 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 22:32:29,452 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 22:32:29,452 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 22:32:29,452 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 22:32:29,677 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 22:32:29,678 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-20 22:32:29,682 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:32:29 BoogieIcfgContainer [2020-07-20 22:32:29,682 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 22:32:29,684 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 22:32:29,684 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 22:32:29,688 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 22:32:29,688 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 10:32:28" (1/3) ... [2020-07-20 22:32:29,689 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bb73d58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:32:29, skipping insertion in model container [2020-07-20 22:32:29,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 10:32:29" (2/3) ... [2020-07-20 22:32:29,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3bb73d58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 10:32:29, skipping insertion in model container [2020-07-20 22:32:29,690 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 10:32:29" (3/3) ... [2020-07-20 22:32:29,692 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-07-20 22:32:29,705 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 22:32:29,713 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 22:32:29,730 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 22:32:29,759 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 22:32:29,759 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 22:32:29,759 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 22:32:29,760 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 22:32:29,760 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 22:32:29,760 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 22:32:29,760 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 22:32:29,761 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 22:32:29,782 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-07-20 22:32:29,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-20 22:32:29,790 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:29,791 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:29,792 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:29,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:29,799 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-07-20 22:32:29,809 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:29,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [757817359] [2020-07-20 22:32:29,810 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 [2020-07-20 22:32:29,889 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:32:29,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:29,892 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 22:32:29,898 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:30,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:30,004 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:32:30,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [757817359] [2020-07-20 22:32:30,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:32:30,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:32:30,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [575847827] [2020-07-20 22:32:30,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:32:30,019 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:30,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:32:30,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:32:30,047 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 3 states. [2020-07-20 22:32:30,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:30,100 INFO L93 Difference]: Finished difference Result 42 states and 53 transitions. [2020-07-20 22:32:30,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:32:30,102 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-07-20 22:32:30,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:30,111 INFO L225 Difference]: With dead ends: 42 [2020-07-20 22:32:30,111 INFO L226 Difference]: Without dead ends: 15 [2020-07-20 22:32:30,115 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:32:30,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-20 22:32:30,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-20 22:32:30,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-20 22:32:30,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-07-20 22:32:30,151 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 12 [2020-07-20 22:32:30,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:30,151 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-07-20 22:32:30,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:32:30,151 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-07-20 22:32:30,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 22:32:30,152 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:30,153 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:30,359 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:30,360 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:30,361 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:30,362 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-07-20 22:32:30,362 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:30,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703456109] [2020-07-20 22:32:30,363 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 [2020-07-20 22:32:30,405 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:32:30,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:30,407 INFO L263 TraceCheckSpWp]: Trace formula consists of 28 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 22:32:30,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:30,476 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:30,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:32:30,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703456109] [2020-07-20 22:32:30,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:32:30,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 22:32:30,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [248952333] [2020-07-20 22:32:30,480 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 22:32:30,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:30,481 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 22:32:30,481 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 22:32:30,481 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-07-20 22:32:30,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:30,526 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-07-20 22:32:30,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 22:32:30,527 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 22:32:30,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:30,528 INFO L225 Difference]: With dead ends: 23 [2020-07-20 22:32:30,529 INFO L226 Difference]: Without dead ends: 17 [2020-07-20 22:32:30,530 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-20 22:32:30,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-20 22:32:30,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-20 22:32:30,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-20 22:32:30,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-07-20 22:32:30,536 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-07-20 22:32:30,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:30,537 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-07-20 22:32:30,537 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 22:32:30,537 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-07-20 22:32:30,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 22:32:30,538 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:30,538 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:30,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:30,752 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:30,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:30,753 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-07-20 22:32:30,754 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:30,755 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705052946] [2020-07-20 22:32:30,755 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 [2020-07-20 22:32:30,803 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 22:32:30,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:30,804 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-20 22:32:30,806 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:30,837 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:30,837 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:32:30,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705052946] [2020-07-20 22:32:30,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:32:30,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 22:32:30,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168671391] [2020-07-20 22:32:30,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 22:32:30,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:30,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 22:32:30,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 22:32:30,841 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-07-20 22:32:30,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:30,875 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2020-07-20 22:32:30,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 22:32:30,876 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-07-20 22:32:30,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:30,879 INFO L225 Difference]: With dead ends: 31 [2020-07-20 22:32:30,880 INFO L226 Difference]: Without dead ends: 22 [2020-07-20 22:32:30,881 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-20 22:32:30,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-07-20 22:32:30,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 18. [2020-07-20 22:32:30,886 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 22:32:30,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 22:32:30,887 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 16 [2020-07-20 22:32:30,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:30,888 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 22:32:30,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 22:32:30,888 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 22:32:30,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-20 22:32:30,889 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:30,889 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:31,102 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:31,103 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:31,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:31,104 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-07-20 22:32:31,104 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:31,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1263075060] [2020-07-20 22:32:31,105 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 [2020-07-20 22:32:31,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:31,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:31,143 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 22:32:31,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:31,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:31,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:31,336 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:31,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1263075060] [2020-07-20 22:32:31,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:31,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-20 22:32:31,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470220854] [2020-07-20 22:32:31,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-20 22:32:31,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:31,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-20 22:32:31,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2020-07-20 22:32:31,340 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 10 states. [2020-07-20 22:32:31,439 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:31,440 INFO L93 Difference]: Finished difference Result 26 states and 27 transitions. [2020-07-20 22:32:31,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 22:32:31,441 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 16 [2020-07-20 22:32:31,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:31,442 INFO L225 Difference]: With dead ends: 26 [2020-07-20 22:32:31,442 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 22:32:31,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2020-07-20 22:32:31,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 22:32:31,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 22:32:31,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 22:32:31,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2020-07-20 22:32:31,448 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 16 [2020-07-20 22:32:31,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:31,449 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2020-07-20 22:32:31,449 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-20 22:32:31,449 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2020-07-20 22:32:31,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 22:32:31,450 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:31,451 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:31,651 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:31,652 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:31,652 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:31,652 INFO L82 PathProgramCache]: Analyzing trace with hash -2145316375, now seen corresponding path program 1 times [2020-07-20 22:32:31,653 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:31,653 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [915460747] [2020-07-20 22:32:31,653 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 [2020-07-20 22:32:31,706 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-20 22:32:31,706 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:31,707 INFO L263 TraceCheckSpWp]: Trace formula consists of 33 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 22:32:31,709 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:31,737 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-20 22:32:31,741 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 4 disjuncts [2020-07-20 22:32:31,744 INFO L501 QuantifierPusher]: Distributing 3 conjuncts over 3 disjuncts [2020-07-20 22:32:31,760 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:31,760 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 22:32:31,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [915460747] [2020-07-20 22:32:31,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 22:32:31,761 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-20 22:32:31,761 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [531963209] [2020-07-20 22:32:31,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-20 22:32:31,762 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:31,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-20 22:32:31,762 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:32:31,762 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand 3 states. [2020-07-20 22:32:31,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:31,775 INFO L93 Difference]: Finished difference Result 29 states and 31 transitions. [2020-07-20 22:32:31,775 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-20 22:32:31,775 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2020-07-20 22:32:31,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:31,776 INFO L225 Difference]: With dead ends: 29 [2020-07-20 22:32:31,776 INFO L226 Difference]: Without dead ends: 20 [2020-07-20 22:32:31,777 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-20 22:32:31,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-20 22:32:31,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-20 22:32:31,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-20 22:32:31,780 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-20 22:32:31,781 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 19 [2020-07-20 22:32:31,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:31,781 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-20 22:32:31,781 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-20 22:32:31,781 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-20 22:32:31,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 22:32:31,782 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:31,782 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:31,983 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:31,984 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:31,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:31,985 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-07-20 22:32:31,986 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:31,986 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [615219409] [2020-07-20 22:32:31,986 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 [2020-07-20 22:32:32,032 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 22:32:32,033 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:32,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 22:32:32,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:32,132 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:32,133 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:32,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:32,294 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:32,295 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [615219409] [2020-07-20 22:32:32,295 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:32,295 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-20 22:32:32,296 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604371227] [2020-07-20 22:32:32,296 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-20 22:32:32,297 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:32,297 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-20 22:32:32,297 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=143, Unknown=0, NotChecked=0, Total=182 [2020-07-20 22:32:32,298 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 14 states. [2020-07-20 22:32:34,472 WARN L193 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 28 DAG size of output: 18 [2020-07-20 22:32:49,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:32:49,077 INFO L93 Difference]: Finished difference Result 39 states and 41 transitions. [2020-07-20 22:32:49,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 22:32:49,079 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 19 [2020-07-20 22:32:49,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:32:49,080 INFO L225 Difference]: With dead ends: 39 [2020-07-20 22:32:49,080 INFO L226 Difference]: Without dead ends: 29 [2020-07-20 22:32:49,081 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=67, Invalid=273, Unknown=2, NotChecked=0, Total=342 [2020-07-20 22:32:49,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-20 22:32:49,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-20 22:32:49,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-20 22:32:49,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-07-20 22:32:49,086 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 19 [2020-07-20 22:32:49,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:32:49,087 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-07-20 22:32:49,087 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-20 22:32:49,087 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-07-20 22:32:49,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 22:32:49,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:32:49,088 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:32:49,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:32:49,290 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:32:49,290 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:32:49,291 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 3 times [2020-07-20 22:32:49,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:32:49,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [237697188] [2020-07-20 22:32:49,292 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 [2020-07-20 22:32:49,341 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:32:49,342 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:32:49,344 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-20 22:32:49,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:32:49,660 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:49,661 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:32:49,714 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:32:54,965 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:32:54,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [237697188] [2020-07-20 22:32:54,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:32:54,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 26 [2020-07-20 22:32:54,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045695773] [2020-07-20 22:32:54,967 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 22:32:54,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:32:54,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 22:32:54,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=543, Unknown=2, NotChecked=0, Total=650 [2020-07-20 22:32:54,968 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2020-07-20 22:33:01,847 WARN L193 SmtUtils]: Spent 6.65 s on a formula simplification. DAG size of input: 53 DAG size of output: 32 [2020-07-20 22:33:10,670 WARN L193 SmtUtils]: Spent 6.72 s on a formula simplification. DAG size of input: 51 DAG size of output: 30 [2020-07-20 22:33:25,740 WARN L193 SmtUtils]: Spent 10.58 s on a formula simplification that was a NOOP. DAG size: 55 [2020-07-20 22:33:42,380 WARN L193 SmtUtils]: Spent 10.15 s on a formula simplification that was a NOOP. DAG size: 53 [2020-07-20 22:34:05,202 WARN L193 SmtUtils]: Spent 8.17 s on a formula simplification that was a NOOP. DAG size: 44 [2020-07-20 22:34:26,003 WARN L193 SmtUtils]: Spent 8.29 s on a formula simplification that was a NOOP. DAG size: 42 [2020-07-20 22:34:56,793 WARN L193 SmtUtils]: Spent 6.21 s on a formula simplification that was a NOOP. DAG size: 32 [2020-07-20 22:35:25,638 WARN L193 SmtUtils]: Spent 6.21 s on a formula simplification that was a NOOP. DAG size: 31 [2020-07-20 22:37:08,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 22:37:08,290 INFO L93 Difference]: Finished difference Result 63 states and 68 transitions. [2020-07-20 22:37:08,292 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-20 22:37:08,292 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2020-07-20 22:37:08,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 22:37:08,294 INFO L225 Difference]: With dead ends: 63 [2020-07-20 22:37:08,294 INFO L226 Difference]: Without dead ends: 47 [2020-07-20 22:37:08,295 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 151.4s TimeCoverageRelationStatistics Valid=226, Invalid=1065, Unknown=41, NotChecked=0, Total=1332 [2020-07-20 22:37:08,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-20 22:37:08,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-07-20 22:37:08,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-07-20 22:37:08,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-07-20 22:37:08,305 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 28 [2020-07-20 22:37:08,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 22:37:08,305 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-07-20 22:37:08,305 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 22:37:08,306 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-07-20 22:37:08,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-07-20 22:37:08,307 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 22:37:08,307 INFO L422 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 22:37:08,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 22:37:08,510 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 22:37:08,511 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 22:37:08,511 INFO L82 PathProgramCache]: Analyzing trace with hash -1188694230, now seen corresponding path program 4 times [2020-07-20 22:37:08,512 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 22:37:08,512 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471763592] [2020-07-20 22:37:08,513 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 [2020-07-20 22:37:08,623 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 22:37:08,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 22:37:08,627 WARN L261 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 95 conjunts are in the unsatisfiable core [2020-07-20 22:37:08,632 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 22:37:09,580 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:37:09,581 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 22:37:09,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 22:37:54,450 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 185 refuted. 2 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 22:37:54,451 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471763592] [2020-07-20 22:37:54,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 22:37:54,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27] total 50 [2020-07-20 22:37:54,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198462048] [2020-07-20 22:37:54,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 22:37:54,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 22:37:54,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 22:37:54,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=345, Invalid=2086, Unknown=19, NotChecked=0, Total=2450 [2020-07-20 22:37:54,456 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 50 states. [2020-07-20 22:38:12,286 WARN L193 SmtUtils]: Spent 16.69 s on a formula simplification. DAG size of input: 122 DAG size of output: 44 [2020-07-20 22:38:29,640 WARN L193 SmtUtils]: Spent 14.98 s on a formula simplification. DAG size of input: 117 DAG size of output: 30 [2020-07-20 22:38:34,127 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 127 DAG size of output: 18 [2020-07-20 22:38:36,225 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294) 4) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290) 12) 4294967296)) (= (mod (+ (* c_main_~j~0 7) c_main_~b~0 (* c_main_~i~0 4294967289) 14) 4294967296) (mod (+ c_main_~a~0 7) 4294967296)) (= (mod (+ c_main_~a~0 10) 4294967296) (mod (+ (* c_main_~j~0 10) c_main_~b~0 (* c_main_~i~0 4294967286) 20) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~a~0 8) 4294967296) (mod (+ (* c_main_~j~0 8) c_main_~b~0 (* c_main_~i~0 4294967288) 16) 4294967296)) (= (mod (+ (* c_main_~j~0 9) c_main_~b~0 (* c_main_~i~0 4294967287) 18) 4294967296) (mod (+ c_main_~a~0 9) 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295) 2) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292) 8) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293) 6) 4294967296) (mod (+ c_main_~a~0 3) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291) 10) 4294967296))) is different from false [2020-07-20 22:38:38,241 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 7) c_main_~b~0 (* c_main_~i~0 4294967289)) 4294967296) (mod (+ c_main_~a~0 7) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290)) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291)) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295)) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294)) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 8) 4294967296) (mod (+ (* c_main_~j~0 8) c_main_~b~0 (* c_main_~i~0 4294967288)) 4294967296)) (= (mod (+ (* c_main_~j~0 10) c_main_~b~0 (* c_main_~i~0 4294967286)) 4294967296) (mod (+ c_main_~a~0 10) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292)) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ c_main_~a~0 9) 4294967296) (mod (+ (* c_main_~j~0 9) c_main_~b~0 (* c_main_~i~0 4294967287)) 4294967296)) (= (mod (+ c_main_~a~0 3) 4294967296) (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293)) 4294967296))) is different from false [2020-07-20 22:40:03,631 WARN L193 SmtUtils]: Spent 51.28 s on a formula simplification. DAG size of input: 113 DAG size of output: 102 [2020-07-20 22:40:09,721 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 7) c_main_~b~0 (* c_main_~i~0 4294967289)) 4294967296) (mod (+ c_main_~a~0 7) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290)) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291)) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295)) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294)) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 8) 4294967296) (mod (+ (* c_main_~j~0 8) c_main_~b~0 (* c_main_~i~0 4294967288)) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292)) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ c_main_~a~0 9) 4294967296) (mod (+ (* c_main_~j~0 9) c_main_~b~0 (* c_main_~i~0 4294967287)) 4294967296)) (= (mod (+ c_main_~a~0 3) 4294967296) (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293)) 4294967296))) is different from false [2020-07-20 22:41:19,858 WARN L193 SmtUtils]: Spent 33.11 s on a formula simplification that was a NOOP. DAG size: 101 [2020-07-20 22:41:27,930 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 7) c_main_~b~0 (* c_main_~i~0 4294967289)) 4294967296) (mod (+ c_main_~a~0 7) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290)) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291)) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295)) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294)) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 8) 4294967296) (mod (+ (* c_main_~j~0 8) c_main_~b~0 (* c_main_~i~0 4294967288)) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292)) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ c_main_~a~0 3) 4294967296) (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293)) 4294967296))) is different from false [2020-07-20 22:41:30,004 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294) 4) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290) 12) 4294967296)) (= (mod (+ (* c_main_~j~0 7) c_main_~b~0 (* c_main_~i~0 4294967289) 14) 4294967296) (mod (+ c_main_~a~0 7) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295) 2) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292) 8) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293) 6) 4294967296) (mod (+ c_main_~a~0 3) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291) 10) 4294967296))) is different from false [2020-07-20 22:42:34,770 WARN L193 SmtUtils]: Spent 26.84 s on a formula simplification that was a NOOP. DAG size: 86 [2020-07-20 22:43:01,194 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294) 4) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ c_main_~a~0 6) 4294967296) (mod (+ (* c_main_~j~0 6) c_main_~b~0 (* c_main_~i~0 4294967290) 12) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295) 2) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292) 8) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293) 6) 4294967296) (mod (+ c_main_~a~0 3) 4294967296)) (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291) 10) 4294967296))) is different from false [2020-07-20 22:44:00,641 WARN L193 SmtUtils]: Spent 17.67 s on a formula simplification that was a NOOP. DAG size: 75 [2020-07-20 22:45:15,515 WARN L193 SmtUtils]: Spent 16.40 s on a formula simplification that was a NOOP. DAG size: 67 [2020-07-20 22:45:38,286 WARN L838 $PredicateComparison]: unable to prove that (and (= (mod (+ c_main_~a~0 5) 4294967296) (mod (+ (* c_main_~j~0 5) c_main_~b~0 (* c_main_~i~0 4294967291)) 4294967296)) (= (mod c_main_~b~0 4294967296) (mod c_main_~a~0 4294967296)) (= (mod (+ c_main_~j~0 c_main_~b~0 (* c_main_~i~0 4294967295)) 4294967296) (mod (+ c_main_~a~0 1) 4294967296)) (= (mod (+ (* c_main_~j~0 2) c_main_~b~0 (* c_main_~i~0 4294967294)) 4294967296) (mod (+ c_main_~a~0 2) 4294967296)) (= (mod (+ (* c_main_~j~0 4) c_main_~b~0 (* c_main_~i~0 4294967292)) 4294967296) (mod (+ c_main_~a~0 4) 4294967296)) (= (mod (+ c_main_~a~0 11) 4294967296) (mod (+ (* c_main_~j~0 11) c_main_~b~0 (* c_main_~i~0 4294967285)) 4294967296)) (= (mod (+ c_main_~a~0 3) 4294967296) (mod (+ (* c_main_~j~0 3) c_main_~b~0 (* c_main_~i~0 4294967293)) 4294967296))) is different from false [2020-07-20 22:46:34,524 WARN L193 SmtUtils]: Spent 13.70 s on a formula simplification that was a NOOP. DAG size: 67