/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:14:58,508 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:14:58,510 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:14:58,529 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-07-21 14:14:58,539 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:14:58,539 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:14:58,540 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:14:58,542 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:14:58,542 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:14:58,543 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:14:58,545 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:14:58,547 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:14:58,548 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:14:58,550 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:14:58,551 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:14:58,551 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:14:58,554 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:14:58,561 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:14:58,562 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:14:58,563 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:14:58,564 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 14:14:58,578 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:14:58,578 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:14:58,579 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:14:58,580 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:14:58,580 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:14:58,580 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:14:58,580 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:14:58,580 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:14:58,581 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:14:58,581 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:14:58,581 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:14:58,581 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:14:58,581 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:14:58,582 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:14:58,582 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:14:58,582 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:14:58,582 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:14:58,582 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:14:58,583 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:14:58,583 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:14:58,583 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:14:58,583 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:14:58,583 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:14:58,584 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:14:58,584 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:14:58,584 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:14:58,584 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:14:58,584 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:14:58,585 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:14:58,585 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:14:58,875 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:14:58,893 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:14:58,896 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:14:58,898 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:14:58,898 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:14:58,900 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 14:14:58,971 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/574dc4a8d/922a7d3107b744899c705d98857ea11b/FLAG7878b67c7 [2020-07-21 14:14:59,405 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:14:59,405 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 14:14:59,410 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/574dc4a8d/922a7d3107b744899c705d98857ea11b/FLAG7878b67c7 [2020-07-21 14:14:59,845 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/574dc4a8d/922a7d3107b744899c705d98857ea11b [2020-07-21 14:14:59,854 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:14:59,857 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:14:59,858 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:14:59,858 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:14:59,861 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:14:59,862 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:59" (1/1) ... [2020-07-21 14:14:59,865 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@e4fe6ba and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:14:59, skipping insertion in model container [2020-07-21 14:14:59,865 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:14:59" (1/1) ... [2020-07-21 14:14:59,873 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:14:59,890 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:15:00,047 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:15:00,051 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:15:00,067 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:15:00,082 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:15:00,082 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00 WrapperNode [2020-07-21 14:15:00,082 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:15:00,083 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:15:00,083 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:15:00,083 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:15:00,094 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,094 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,099 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,099 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,102 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,106 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,106 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (1/1) ... [2020-07-21 14:15:00,180 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:15:00,180 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:15:00,180 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:15:00,181 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:15:00,182 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (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 14:15:00,255 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:15:00,255 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:15:00,256 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 14:15:00,256 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:15:00,256 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:15:00,256 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:15:00,256 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 14:15:00,256 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 14:15:00,256 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:15:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 14:15:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:15:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:15:00,257 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:15:00,415 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:15:00,415 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:15:00,419 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:15:00 BoogieIcfgContainer [2020-07-21 14:15:00,419 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:15:00,420 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:15:00,420 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:15:00,423 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:15:00,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:14:59" (1/3) ... [2020-07-21 14:15:00,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@545fd04e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:15:00, skipping insertion in model container [2020-07-21 14:15:00,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:15:00" (2/3) ... [2020-07-21 14:15:00,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@545fd04e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:15:00, skipping insertion in model container [2020-07-21 14:15:00,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:15:00" (3/3) ... [2020-07-21 14:15:00,427 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005_variant.i [2020-07-21 14:15:00,437 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:15:00,444 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:15:00,458 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:15:00,481 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:15:00,481 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:15:00,481 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:15:00,481 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:15:00,482 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:15:00,482 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:15:00,482 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:15:00,482 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:15:00,500 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 14:15:00,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 14:15:00,506 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:00,507 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:00,507 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:00,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:00,513 INFO L82 PathProgramCache]: Analyzing trace with hash 1608903343, now seen corresponding path program 1 times [2020-07-21 14:15:00,522 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:00,522 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1519627789] [2020-07-21 14:15:00,523 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:00,574 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 14:15:00,575 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:00,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 14:15:00,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:00,623 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 14:15:00,623 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:15:00,624 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1519627789] [2020-07-21 14:15:00,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:15:00,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:15:00,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [958964103] [2020-07-21 14:15:00,630 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:15:00,630 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:00,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:15:00,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:15:00,643 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-07-21 14:15:00,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:00,689 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-07-21 14:15:00,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:15:00,692 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-21 14:15:00,692 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:00,701 INFO L225 Difference]: With dead ends: 32 [2020-07-21 14:15:00,702 INFO L226 Difference]: Without dead ends: 13 [2020-07-21 14:15:00,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 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 14:15:00,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-21 14:15:00,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-21 14:15:00,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-21 14:15:00,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-21 14:15:00,764 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-07-21 14:15:00,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:00,764 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-21 14:15:00,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:15:00,765 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-21 14:15:00,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 14:15:00,765 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:00,766 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:00,981 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:00,981 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:00,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:00,982 INFO L82 PathProgramCache]: Analyzing trace with hash -1628066164, now seen corresponding path program 1 times [2020-07-21 14:15:00,983 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:00,984 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882503479] [2020-07-21 14:15:00,984 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:01,014 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:01,015 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:01,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 14:15:01,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:01,136 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:01,183 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 14:15:01,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:01,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:01,324 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 14:15:01,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882503479] [2020-07-21 14:15:01,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:01,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 14:15:01,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1981704865] [2020-07-21 14:15:01,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:15:01,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:01,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:15:01,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:15:01,329 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2020-07-21 14:15:01,533 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:01,534 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-07-21 14:15:01,534 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 14:15:01,535 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2020-07-21 14:15:01,535 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:01,536 INFO L225 Difference]: With dead ends: 21 [2020-07-21 14:15:01,536 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 14:15:01,538 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=63, Invalid=209, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:15:01,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 14:15:01,542 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 14:15:01,542 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 14:15:01,543 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 14:15:01,543 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-07-21 14:15:01,544 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:01,544 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 14:15:01,544 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:15:01,545 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 14:15:01,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 14:15:01,545 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:01,546 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:01,758 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:01,759 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:01,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:01,760 INFO L82 PathProgramCache]: Analyzing trace with hash -66279700, now seen corresponding path program 2 times [2020-07-21 14:15:01,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:01,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1765307750] [2020-07-21 14:15:01,762 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:01,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:01,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:01,799 WARN L261 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 14:15:01,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:01,916 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:01,949 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:01,949 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:01,977 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:02,098 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:02,099 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1765307750] [2020-07-21 14:15:02,099 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:02,099 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-21 14:15:02,100 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [407830090] [2020-07-21 14:15:02,100 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 14:15:02,100 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:02,101 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 14:15:02,101 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=169, Unknown=0, NotChecked=0, Total=210 [2020-07-21 14:15:02,101 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 15 states. [2020-07-21 14:15:02,508 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:02,508 INFO L93 Difference]: Finished difference Result 25 states and 28 transitions. [2020-07-21 14:15:02,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 14:15:02,510 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 14 [2020-07-21 14:15:02,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:02,511 INFO L225 Difference]: With dead ends: 25 [2020-07-21 14:15:02,511 INFO L226 Difference]: Without dead ends: 19 [2020-07-21 14:15:02,513 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=128, Invalid=472, Unknown=0, NotChecked=0, Total=600 [2020-07-21 14:15:02,513 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-07-21 14:15:02,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-07-21 14:15:02,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-07-21 14:15:02,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-07-21 14:15:02,524 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 14 [2020-07-21 14:15:02,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:02,524 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-07-21 14:15:02,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 14:15:02,525 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-07-21 14:15:02,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-21 14:15:02,526 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:02,526 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:02,740 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:02,741 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:02,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:02,742 INFO L82 PathProgramCache]: Analyzing trace with hash -43331668, now seen corresponding path program 3 times [2020-07-21 14:15:02,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:02,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [785833511] [2020-07-21 14:15:02,743 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:02,782 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:02,782 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:02,784 WARN L261 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 14:15:02,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:02,955 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:03,000 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:03,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:03,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:03,366 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:03,367 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [785833511] [2020-07-21 14:15:03,367 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:03,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-21 14:15:03,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553090548] [2020-07-21 14:15:03,368 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 14:15:03,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:03,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 14:15:03,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=409, Unknown=0, NotChecked=0, Total=506 [2020-07-21 14:15:03,370 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 23 states. [2020-07-21 14:15:04,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:04,523 INFO L93 Difference]: Finished difference Result 33 states and 40 transitions. [2020-07-21 14:15:04,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-21 14:15:04,524 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 18 [2020-07-21 14:15:04,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:04,525 INFO L225 Difference]: With dead ends: 33 [2020-07-21 14:15:04,525 INFO L226 Difference]: Without dead ends: 27 [2020-07-21 14:15:04,526 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=356, Invalid=1284, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 14:15:04,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-21 14:15:04,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-21 14:15:04,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-21 14:15:04,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-07-21 14:15:04,539 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 18 [2020-07-21 14:15:04,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:04,540 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-07-21 14:15:04,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 14:15:04,540 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-07-21 14:15:04,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 14:15:04,541 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:04,541 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:04,742 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:04,743 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:04,743 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:04,743 INFO L82 PathProgramCache]: Analyzing trace with hash 101712172, now seen corresponding path program 4 times [2020-07-21 14:15:04,744 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:04,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1513621507] [2020-07-21 14:15:04,745 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:04,784 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:04,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:04,790 WARN L261 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 14:15:04,795 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:05,166 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:05,235 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:05,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:05,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:06,194 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:06,195 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1513621507] [2020-07-21 14:15:06,195 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:06,195 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 40 [2020-07-21 14:15:06,196 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043818381] [2020-07-21 14:15:06,196 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-21 14:15:06,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:06,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-21 14:15:06,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=310, Invalid=1250, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 14:15:06,199 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 40 states. [2020-07-21 14:15:07,059 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 113 [2020-07-21 14:15:07,325 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 114 DAG size of output: 76 [2020-07-21 14:15:07,529 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 14:15:07,741 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 104 DAG size of output: 66 [2020-07-21 14:15:09,863 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 103 [2020-07-21 14:15:09,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:09,873 INFO L93 Difference]: Finished difference Result 49 states and 64 transitions. [2020-07-21 14:15:09,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-21 14:15:09,874 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 26 [2020-07-21 14:15:09,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:09,876 INFO L225 Difference]: With dead ends: 49 [2020-07-21 14:15:09,876 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 14:15:09,879 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 721 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1203, Invalid=4199, Unknown=0, NotChecked=0, Total=5402 [2020-07-21 14:15:09,880 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 14:15:09,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-07-21 14:15:09,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-07-21 14:15:09,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-07-21 14:15:09,892 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 26 [2020-07-21 14:15:09,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:09,892 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-07-21 14:15:09,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-21 14:15:09,893 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-07-21 14:15:09,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-07-21 14:15:09,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:09,894 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:10,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:10,109 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:10,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:10,110 INFO L82 PathProgramCache]: Analyzing trace with hash -868359124, now seen corresponding path program 5 times [2020-07-21 14:15:10,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:10,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110240580] [2020-07-21 14:15:10,112 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:10,168 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:10,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:10,174 WARN L261 TraceCheckSpWp]: Trace formula consists of 247 conjuncts, 194 conjunts are in the unsatisfiable core [2020-07-21 14:15:10,177 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:11,265 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:11,386 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:11,386 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:11,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:14,580 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:14,580 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110240580] [2020-07-21 14:15:14,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:14,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38] total 72 [2020-07-21 14:15:14,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35437938] [2020-07-21 14:15:14,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 72 states [2020-07-21 14:15:14,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:14,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2020-07-21 14:15:14,596 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1110, Invalid=4002, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 14:15:14,596 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 72 states. [2020-07-21 14:15:17,434 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 14:15:18,063 WARN L193 SmtUtils]: Spent 479.00 ms on a formula simplification. DAG size of input: 218 DAG size of output: 140 [2020-07-21 14:15:18,638 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2020-07-21 14:15:19,155 WARN L193 SmtUtils]: Spent 406.00 ms on a formula simplification. DAG size of input: 208 DAG size of output: 130 [2020-07-21 14:15:19,713 WARN L193 SmtUtils]: Spent 276.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 14:15:20,330 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 14:15:20,837 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 14:15:21,341 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 14:15:21,833 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification that was a NOOP. DAG size: 171 [2020-07-21 14:15:22,317 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 14:15:22,789 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2020-07-21 14:15:23,247 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 14:15:23,756 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 14:15:24,214 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 14:15:24,630 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 14:15:25,029 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 14:15:25,430 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 14:15:25,803 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:15:26,185 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 14:15:26,552 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 14:15:26,893 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 14:15:27,233 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 14:15:30,662 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 14:15:30,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:15:30,680 INFO L93 Difference]: Finished difference Result 81 states and 112 transitions. [2020-07-21 14:15:30,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-21 14:15:30,680 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 42 [2020-07-21 14:15:30,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:15:30,682 INFO L225 Difference]: With dead ends: 81 [2020-07-21 14:15:30,682 INFO L226 Difference]: Without dead ends: 75 [2020-07-21 14:15:30,687 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 136 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2465 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=4419, Invalid=14487, Unknown=0, NotChecked=0, Total=18906 [2020-07-21 14:15:30,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-21 14:15:30,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-21 14:15:30,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 14:15:30,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-07-21 14:15:30,714 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 42 [2020-07-21 14:15:30,714 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:15:30,714 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-07-21 14:15:30,715 INFO L480 AbstractCegarLoop]: Interpolant automaton has 72 states. [2020-07-21 14:15:30,715 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-07-21 14:15:30,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-07-21 14:15:30,717 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:15:30,717 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:15:30,931 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:30,932 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:15:30,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:15:30,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1445440044, now seen corresponding path program 6 times [2020-07-21 14:15:30,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:15:30,934 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1951641873] [2020-07-21 14:15:30,934 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:15:31,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:15:31,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:15:31,037 WARN L261 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 386 conjunts are in the unsatisfiable core [2020-07-21 14:15:31,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:15:34,942 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:15:35,184 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:35,185 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:15:35,400 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:15:47,743 INFO L134 CoverageAnalysis]: Checked inductivity of 2016 backedges. 0 proven. 2016 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:15:47,743 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1951641873] [2020-07-21 14:15:47,743 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:15:47,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 70] total 135 [2020-07-21 14:15:47,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244755846] [2020-07-21 14:15:47,744 INFO L459 AbstractCegarLoop]: Interpolant automaton has 135 states [2020-07-21 14:15:47,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:15:47,746 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 135 interpolants. [2020-07-21 14:15:47,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4241, Invalid=13849, Unknown=0, NotChecked=0, Total=18090 [2020-07-21 14:15:47,751 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 135 states. [2020-07-21 14:15:57,884 WARN L193 SmtUtils]: Spent 916.00 ms on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 14:15:59,537 WARN L193 SmtUtils]: Spent 1.26 s on a formula simplification. DAG size of input: 428 DAG size of output: 270 [2020-07-21 14:16:01,908 WARN L193 SmtUtils]: Spent 815.00 ms on a formula simplification that was a NOOP. DAG size: 411 [2020-07-21 14:16:03,364 WARN L193 SmtUtils]: Spent 1.15 s on a formula simplification. DAG size of input: 416 DAG size of output: 258 [2020-07-21 14:16:05,689 WARN L193 SmtUtils]: Spent 783.00 ms on a formula simplification that was a NOOP. DAG size: 405 [2020-07-21 14:16:08,184 WARN L193 SmtUtils]: Spent 775.00 ms on a formula simplification that was a NOOP. DAG size: 398 [2020-07-21 14:16:10,528 WARN L193 SmtUtils]: Spent 771.00 ms on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 14:16:12,832 WARN L193 SmtUtils]: Spent 736.00 ms on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 14:16:15,123 WARN L193 SmtUtils]: Spent 734.00 ms on a formula simplification that was a NOOP. DAG size: 379 [2020-07-21 14:16:17,422 WARN L193 SmtUtils]: Spent 730.00 ms on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 14:16:19,720 WARN L193 SmtUtils]: Spent 734.00 ms on a formula simplification that was a NOOP. DAG size: 366 [2020-07-21 14:16:21,953 WARN L193 SmtUtils]: Spent 697.00 ms on a formula simplification that was a NOOP. DAG size: 359 [2020-07-21 14:16:24,175 WARN L193 SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 353 [2020-07-21 14:16:26,370 WARN L193 SmtUtils]: Spent 660.00 ms on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 14:16:28,520 WARN L193 SmtUtils]: Spent 638.00 ms on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 14:16:30,680 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification that was a NOOP. DAG size: 333 [2020-07-21 14:16:32,813 WARN L193 SmtUtils]: Spent 635.00 ms on a formula simplification that was a NOOP. DAG size: 327 [2020-07-21 14:16:34,941 WARN L193 SmtUtils]: Spent 623.00 ms on a formula simplification that was a NOOP. DAG size: 320 [2020-07-21 14:16:37,011 WARN L193 SmtUtils]: Spent 586.00 ms on a formula simplification that was a NOOP. DAG size: 314 [2020-07-21 14:16:39,078 WARN L193 SmtUtils]: Spent 579.00 ms on a formula simplification that was a NOOP. DAG size: 307 [2020-07-21 14:16:41,143 WARN L193 SmtUtils]: Spent 585.00 ms on a formula simplification that was a NOOP. DAG size: 301 [2020-07-21 14:16:43,210 WARN L193 SmtUtils]: Spent 561.00 ms on a formula simplification that was a NOOP. DAG size: 294 [2020-07-21 14:16:45,234 WARN L193 SmtUtils]: Spent 557.00 ms on a formula simplification that was a NOOP. DAG size: 288 [2020-07-21 14:16:47,258 WARN L193 SmtUtils]: Spent 533.00 ms on a formula simplification that was a NOOP. DAG size: 281 [2020-07-21 14:16:49,236 WARN L193 SmtUtils]: Spent 516.00 ms on a formula simplification that was a NOOP. DAG size: 275 [2020-07-21 14:16:51,194 WARN L193 SmtUtils]: Spent 517.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 14:16:53,175 WARN L193 SmtUtils]: Spent 506.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 14:16:55,090 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 255 [2020-07-21 14:16:57,015 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 249 [2020-07-21 14:16:58,876 WARN L193 SmtUtils]: Spent 446.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 14:17:00,738 WARN L193 SmtUtils]: Spent 455.00 ms on a formula simplification that was a NOOP. DAG size: 236 [2020-07-21 14:17:02,526 WARN L193 SmtUtils]: Spent 424.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-21 14:17:04,276 WARN L193 SmtUtils]: Spent 421.00 ms on a formula simplification that was a NOOP. DAG size: 223 [2020-07-21 14:17:06,038 WARN L193 SmtUtils]: Spent 422.00 ms on a formula simplification that was a NOOP. DAG size: 216 [2020-07-21 14:17:07,754 WARN L193 SmtUtils]: Spent 401.00 ms on a formula simplification that was a NOOP. DAG size: 210 [2020-07-21 14:17:09,442 WARN L193 SmtUtils]: Spent 385.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2020-07-21 14:17:11,102 WARN L193 SmtUtils]: Spent 392.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 14:17:12,718 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 14:17:14,264 WARN L193 SmtUtils]: Spent 345.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 14:17:15,804 WARN L193 SmtUtils]: Spent 351.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 14:17:17,343 WARN L193 SmtUtils]: Spent 332.00 ms on a formula simplification that was a NOOP. DAG size: 171 [2020-07-21 14:17:18,809 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 14:17:20,235 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2020-07-21 14:17:21,619 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 14:17:23,015 WARN L193 SmtUtils]: Spent 271.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 14:17:24,326 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 14:17:25,580 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 14:17:26,786 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 14:17:28,282 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 14:17:29,703 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 14:17:30,952 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 14:17:32,275 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 14:17:33,587 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 14:17:34,815 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 14:17:35,920 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-21 14:17:37,102 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 14:17:38,165 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 14:17:39,168 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 14:17:40,043 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 14:17:40,969 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 14:17:49,213 WARN L193 SmtUtils]: Spent 1.35 s on a formula simplification that was a NOOP. DAG size: 415 [2020-07-21 14:17:49,237 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:17:49,238 INFO L93 Difference]: Finished difference Result 145 states and 208 transitions. [2020-07-21 14:17:49,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 135 states. [2020-07-21 14:17:49,240 INFO L78 Accepts]: Start accepts. Automaton has 135 states. Word has length 74 [2020-07-21 14:17:49,240 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:17:49,242 INFO L225 Difference]: With dead ends: 145 [2020-07-21 14:17:49,242 INFO L226 Difference]: Without dead ends: 139 [2020-07-21 14:17:49,250 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 277 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 263 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8959 ImplicationChecksByTransitivity, 131.7s TimeCoverageRelationStatistics Valid=16988, Invalid=52972, Unknown=0, NotChecked=0, Total=69960 [2020-07-21 14:17:49,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 139 states. [2020-07-21 14:17:49,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 139 to 139. [2020-07-21 14:17:49,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2020-07-21 14:17:49,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 139 transitions. [2020-07-21 14:17:49,308 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 139 transitions. Word has length 74 [2020-07-21 14:17:49,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:17:49,308 INFO L479 AbstractCegarLoop]: Abstraction has 139 states and 139 transitions. [2020-07-21 14:17:49,309 INFO L480 AbstractCegarLoop]: Interpolant automaton has 135 states. [2020-07-21 14:17:49,309 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 139 transitions. [2020-07-21 14:17:49,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 139 [2020-07-21 14:17:49,311 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:17:49,311 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:17:49,512 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:49,512 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:17:49,512 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:17:49,513 INFO L82 PathProgramCache]: Analyzing trace with hash -1338821076, now seen corresponding path program 7 times [2020-07-21 14:17:49,513 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:17:49,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1453518408] [2020-07-21 14:17:49,515 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:17:49,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:17:49,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:17:49,758 WARN L261 TraceCheckSpWp]: Trace formula consists of 919 conjuncts, 770 conjunts are in the unsatisfiable core [2020-07-21 14:17:49,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:18:16,738 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 14:18:17,717 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:18:17,717 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:18:18,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 14:20:12,217 INFO L134 CoverageAnalysis]: Checked inductivity of 8128 backedges. 0 proven. 8128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:20:12,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1453518408] [2020-07-21 14:20:12,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:20:12,218 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134] total 263 [2020-07-21 14:20:12,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912441089] [2020-07-21 14:20:12,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 263 states [2020-07-21 14:20:12,219 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:20:12,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 263 interpolants. [2020-07-21 14:20:12,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16657, Invalid=52249, Unknown=0, NotChecked=0, Total=68906 [2020-07-21 14:20:12,225 INFO L87 Difference]: Start difference. First operand 139 states and 139 transitions. Second operand 263 states. [2020-07-21 14:22:48,786 WARN L193 SmtUtils]: Spent 7.93 s on a formula simplification that was a NOOP. DAG size: 843 [2020-07-21 14:22:59,174 WARN L193 SmtUtils]: Spent 8.17 s on a formula simplification. DAG size of input: 844 DAG size of output: 526 [2020-07-21 14:23:49,345 WARN L193 SmtUtils]: Spent 7.07 s on a formula simplification that was a NOOP. DAG size: 827 [2020-07-21 14:23:58,578 WARN L193 SmtUtils]: Spent 7.72 s on a formula simplification. DAG size of input: 832 DAG size of output: 514 [2020-07-21 14:24:51,250 WARN L193 SmtUtils]: Spent 7.88 s on a formula simplification that was a NOOP. DAG size: 821 [2020-07-21 14:25:45,809 WARN L193 SmtUtils]: Spent 7.28 s on a formula simplification that was a NOOP. DAG size: 814 [2020-07-21 14:26:43,725 WARN L193 SmtUtils]: Spent 7.75 s on a formula simplification that was a NOOP. DAG size: 808 [2020-07-21 14:27:44,772 WARN L193 SmtUtils]: Spent 8.19 s on a formula simplification that was a NOOP. DAG size: 801 [2020-07-21 14:28:50,380 WARN L193 SmtUtils]: Spent 8.42 s on a formula simplification that was a NOOP. DAG size: 795