/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 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/jm2006.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 20:35:52,340 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 20:35:52,342 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 20:35:52,357 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 20:35:52,357 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 20:35:52,359 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 20:35:52,361 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 20:35:52,363 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 20:35:52,365 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 20:35:52,367 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 20:35:52,368 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 20:35:52,370 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 20:35:52,370 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 20:35:52,371 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 20:35:52,373 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 20:35:52,374 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 20:35:52,376 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 20:35:52,377 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 20:35:52,379 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 20:35:52,382 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 20:35:52,384 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 20:35:52,385 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 20:35:52,387 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 20:35:52,388 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 20:35:52,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 20:35:52,406 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 20:35:52,407 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 20:35:52,408 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 20:35:52,409 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 20:35:52,426 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 20:35:52,426 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 20:35:52,428 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 20:35:52,428 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 20:35:52,429 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 20:35:52,429 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 20:35:52,429 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 20:35:52,429 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 20:35:52,430 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 20:35:52,430 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 20:35:52,430 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 20:35:52,430 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 20:35:52,430 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 20:35:52,431 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 20:35:52,431 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 20:35:52,431 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 20:35:52,431 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 20:35:52,431 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 20:35:52,432 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 20:35:52,432 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 20:35:52,432 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 20:35:52,432 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:35:52,433 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 20:35:52,433 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 20:35:52,433 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 20:35:52,433 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 20:35:52,433 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:52,434 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 20:35:52,434 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 20:35:52,434 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 -> 2 [2020-07-21 20:35:52,778 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 20:35:52,798 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 20:35:52,803 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 20:35:52,806 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 20:35:52,807 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 20:35:52,808 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-21 20:35:52,908 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a2cd8427/9448b8b5238d40a3bd7a8dc82b925460/FLAGe93f90603 [2020-07-21 20:35:53,489 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 20:35:53,490 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/jm2006.i [2020-07-21 20:35:53,498 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a2cd8427/9448b8b5238d40a3bd7a8dc82b925460/FLAGe93f90603 [2020-07-21 20:35:53,862 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6a2cd8427/9448b8b5238d40a3bd7a8dc82b925460 [2020-07-21 20:35:53,873 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 20:35:53,877 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 20:35:53,878 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:53,878 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 20:35:53,883 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 20:35:53,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:53" (1/1) ... [2020-07-21 20:35:53,888 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4f695dac and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:53, skipping insertion in model container [2020-07-21 20:35:53,888 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 08:35:53" (1/1) ... [2020-07-21 20:35:53,899 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 20:35:53,926 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 20:35:54,163 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:54,173 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 20:35:54,192 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 20:35:54,210 INFO L208 MainTranslator]: Completed translation [2020-07-21 20:35:54,211 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54 WrapperNode [2020-07-21 20:35:54,211 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 20:35:54,212 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 20:35:54,212 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 20:35:54,212 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 20:35:54,224 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,224 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,231 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,236 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,244 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... [2020-07-21 20:35:54,339 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 20:35:54,340 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 20:35:54,340 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 20:35:54,340 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 20:35:54,341 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 20:35:54,412 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 20:35:54,412 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 20:35:54,413 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 20:35:54,413 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 20:35:54,413 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 20:35:54,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 20:35:54,414 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 20:35:54,414 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 20:35:54,414 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 20:35:54,415 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 20:35:54,415 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 20:35:54,415 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 20:35:54,416 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 20:35:54,645 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 20:35:54,645 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 20:35:54,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:54 BoogieIcfgContainer [2020-07-21 20:35:54,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 20:35:54,652 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 20:35:54,652 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 20:35:54,655 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 20:35:54,655 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 08:35:53" (1/3) ... [2020-07-21 20:35:54,656 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a05013b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:54, skipping insertion in model container [2020-07-21 20:35:54,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 08:35:54" (2/3) ... [2020-07-21 20:35:54,657 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2a05013b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 08:35:54, skipping insertion in model container [2020-07-21 20:35:54,657 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 08:35:54" (3/3) ... [2020-07-21 20:35:54,659 INFO L109 eAbstractionObserver]: Analyzing ICFG jm2006.i [2020-07-21 20:35:54,670 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 20:35:54,678 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 20:35:54,694 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 20:35:54,744 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 20:35:54,745 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 20:35:54,745 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 20:35:54,745 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 20:35:54,745 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 20:35:54,745 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 20:35:54,746 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 20:35:54,746 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 20:35:54,787 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 20:35:54,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 20:35:54,804 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:54,805 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:54,807 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:54,812 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:54,813 INFO L82 PathProgramCache]: Analyzing trace with hash -42161200, now seen corresponding path program 1 times [2020-07-21 20:35:54,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:54,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1843796142] [2020-07-21 20:35:54,820 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 20:35:54,885 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:54,885 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:54,888 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-21 20:35:54,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:54,992 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 20:35:55,025 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 20:35:55,025 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 20:35:55,027 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1843796142] [2020-07-21 20:35:55,028 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 20:35:55,028 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2020-07-21 20:35:55,029 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1103010738] [2020-07-21 20:35:55,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-07-21 20:35:55,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:55,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-07-21 20:35:55,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-07-21 20:35:55,052 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 7 states. [2020-07-21 20:35:55,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:55,243 INFO L93 Difference]: Finished difference Result 46 states and 57 transitions. [2020-07-21 20:35:55,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 20:35:55,246 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 12 [2020-07-21 20:35:55,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:55,256 INFO L225 Difference]: With dead ends: 46 [2020-07-21 20:35:55,257 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 20:35:55,261 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-07-21 20:35:55,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 20:35:55,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 20:35:55,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 20:35:55,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 20:35:55,303 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 20:35:55,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:55,304 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 20:35:55,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-07-21 20:35:55,304 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 20:35:55,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 20:35:55,305 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:55,305 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:55,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:55,507 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:55,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:55,508 INFO L82 PathProgramCache]: Analyzing trace with hash 219103455, now seen corresponding path program 1 times [2020-07-21 20:35:55,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:55,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [901617658] [2020-07-21 20:35:55,510 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 20:35:55,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:55,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:55,578 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-21 20:35:55,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:55,716 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 20:35:55,716 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:55,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:55,871 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 20:35:55,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [901617658] [2020-07-21 20:35:55,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:55,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 11 [2020-07-21 20:35:55,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [498015494] [2020-07-21 20:35:55,886 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 20:35:55,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:55,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 20:35:55,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-07-21 20:35:55,891 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 11 states. [2020-07-21 20:35:56,141 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:56,142 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2020-07-21 20:35:56,142 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 20:35:56,142 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 13 [2020-07-21 20:35:56,143 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:56,143 INFO L225 Difference]: With dead ends: 25 [2020-07-21 20:35:56,144 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 20:35:56,146 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=73, Invalid=199, Unknown=0, NotChecked=0, Total=272 [2020-07-21 20:35:56,146 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 20:35:56,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 20:35:56,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 20:35:56,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 20:35:56,151 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-21 20:35:56,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:56,152 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 20:35:56,152 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 20:35:56,152 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 20:35:56,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 20:35:56,153 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:56,153 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:56,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:56,369 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:56,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:56,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1744767088, now seen corresponding path program 2 times [2020-07-21 20:35:56,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:56,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [323051560] [2020-07-21 20:35:56,373 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 20:35:56,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:56,407 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:56,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-21 20:35:56,410 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:56,582 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:56,582 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:56,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:56,824 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:56,825 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [323051560] [2020-07-21 20:35:56,825 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:56,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 17 [2020-07-21 20:35:56,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760196532] [2020-07-21 20:35:56,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 20:35:56,829 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:56,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 20:35:56,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2020-07-21 20:35:56,831 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 17 states. [2020-07-21 20:35:57,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:35:57,562 INFO L93 Difference]: Finished difference Result 31 states and 36 transitions. [2020-07-21 20:35:57,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 20:35:57,569 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 16 [2020-07-21 20:35:57,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:35:57,570 INFO L225 Difference]: With dead ends: 31 [2020-07-21 20:35:57,570 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 20:35:57,572 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=188, Invalid=514, Unknown=0, NotChecked=0, Total=702 [2020-07-21 20:35:57,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 20:35:57,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 20:35:57,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 20:35:57,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-21 20:35:57,583 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-21 20:35:57,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:35:57,583 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-21 20:35:57,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 20:35:57,584 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-21 20:35:57,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 20:35:57,585 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:35:57,585 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:35:57,793 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:35:57,795 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:35:57,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:35:57,796 INFO L82 PathProgramCache]: Analyzing trace with hash -1040440016, now seen corresponding path program 3 times [2020-07-21 20:35:57,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:35:57,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907274821] [2020-07-21 20:35:57,804 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 20:35:57,844 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:35:57,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:35:57,846 WARN L261 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 51 conjunts are in the unsatisfiable core [2020-07-21 20:35:57,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:35:58,158 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:58,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:35:58,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:35:58,668 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:35:58,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907274821] [2020-07-21 20:35:58,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:35:58,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 29 [2020-07-21 20:35:58,670 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056602158] [2020-07-21 20:35:58,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 20:35:58,671 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:35:58,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 20:35:58,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=631, Unknown=0, NotChecked=0, Total=812 [2020-07-21 20:35:58,673 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 29 states. [2020-07-21 20:35:59,289 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 60 DAG size of output: 50 [2020-07-21 20:35:59,566 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 59 DAG size of output: 49 [2020-07-21 20:36:00,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:00,525 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2020-07-21 20:36:00,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 20:36:00,526 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 22 [2020-07-21 20:36:00,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:00,527 INFO L225 Difference]: With dead ends: 43 [2020-07-21 20:36:00,527 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 20:36:00,529 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 13 SyntacticMatches, 3 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=560, Invalid=1420, Unknown=0, NotChecked=0, Total=1980 [2020-07-21 20:36:00,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 20:36:00,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 20:36:00,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 20:36:00,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-21 20:36:00,540 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-21 20:36:00,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:00,541 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-21 20:36:00,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 20:36:00,541 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-21 20:36:00,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 20:36:00,543 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:00,543 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:00,757 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:00,758 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:00,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:00,759 INFO L82 PathProgramCache]: Analyzing trace with hash -276146064, now seen corresponding path program 4 times [2020-07-21 20:36:00,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:00,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1955806604] [2020-07-21 20:36:00,761 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 20:36:00,810 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:00,811 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:00,813 WARN L261 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 99 conjunts are in the unsatisfiable core [2020-07-21 20:36:00,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:36:01,610 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:01,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:01,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:03,233 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:03,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1955806604] [2020-07-21 20:36:03,235 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:03,235 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29] total 53 [2020-07-21 20:36:03,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [570426219] [2020-07-21 20:36:03,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-07-21 20:36:03,239 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:03,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-07-21 20:36:03,241 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=637, Invalid=2119, Unknown=0, NotChecked=0, Total=2756 [2020-07-21 20:36:03,241 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 53 states. [2020-07-21 20:36:04,276 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 20:36:04,675 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 120 DAG size of output: 98 [2020-07-21 20:36:05,025 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:05,374 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 119 DAG size of output: 97 [2020-07-21 20:36:05,724 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:36:06,111 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 20:36:06,398 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 20:36:06,690 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 20:36:06,991 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 20:36:07,280 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 20:36:10,526 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:10,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:36:10,544 INFO L93 Difference]: Finished difference Result 67 states and 90 transitions. [2020-07-21 20:36:10,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 20:36:10,545 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 34 [2020-07-21 20:36:10,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:36:10,547 INFO L225 Difference]: With dead ends: 67 [2020-07-21 20:36:10,547 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 20:36:10,550 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 8.6s TimeCoverageRelationStatistics Valid=1952, Invalid=4528, Unknown=0, NotChecked=0, Total=6480 [2020-07-21 20:36:10,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 20:36:10,569 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-21 20:36:10,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 20:36:10,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-21 20:36:10,572 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-21 20:36:10,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:36:10,573 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-21 20:36:10,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-07-21 20:36:10,573 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-21 20:36:10,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 20:36:10,575 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:36:10,575 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:36:10,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:36:10,785 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:36:10,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:36:10,786 INFO L82 PathProgramCache]: Analyzing trace with hash -2111955216, now seen corresponding path program 5 times [2020-07-21 20:36:10,786 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:36:10,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1153490807] [2020-07-21 20:36:10,787 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 20:36:10,859 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:36:10,860 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:36:10,865 WARN L261 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 195 conjunts are in the unsatisfiable core [2020-07-21 20:36:10,870 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:36:13,517 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:13,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:36:13,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:36:19,720 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:36:19,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1153490807] [2020-07-21 20:36:19,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:36:19,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53] total 101 [2020-07-21 20:36:19,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [202884077] [2020-07-21 20:36:19,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 101 states [2020-07-21 20:36:19,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:36:19,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2020-07-21 20:36:19,727 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2413, Invalid=7687, Unknown=0, NotChecked=0, Total=10100 [2020-07-21 20:36:19,728 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 101 states. [2020-07-21 20:36:23,697 WARN L193 SmtUtils]: Spent 478.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 20:36:24,798 WARN L193 SmtUtils]: Spent 818.00 ms on a formula simplification. DAG size of input: 240 DAG size of output: 194 [2020-07-21 20:36:26,192 WARN L193 SmtUtils]: Spent 465.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 20:36:27,175 WARN L193 SmtUtils]: Spent 786.00 ms on a formula simplification. DAG size of input: 239 DAG size of output: 193 [2020-07-21 20:36:28,531 WARN L193 SmtUtils]: Spent 454.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 20:36:30,085 WARN L193 SmtUtils]: Spent 441.00 ms on a formula simplification that was a NOOP. DAG size: 227 [2020-07-21 20:36:31,407 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 222 [2020-07-21 20:36:32,730 WARN L193 SmtUtils]: Spent 430.00 ms on a formula simplification that was a NOOP. DAG size: 217 [2020-07-21 20:36:34,005 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification that was a NOOP. DAG size: 212 [2020-07-21 20:36:35,276 WARN L193 SmtUtils]: Spent 407.00 ms on a formula simplification that was a NOOP. DAG size: 207 [2020-07-21 20:36:36,513 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 20:36:37,749 WARN L193 SmtUtils]: Spent 402.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 20:36:38,893 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 192 [2020-07-21 20:36:40,004 WARN L193 SmtUtils]: Spent 349.00 ms on a formula simplification that was a NOOP. DAG size: 187 [2020-07-21 20:36:41,057 WARN L193 SmtUtils]: Spent 350.00 ms on a formula simplification that was a NOOP. DAG size: 182 [2020-07-21 20:36:42,203 WARN L193 SmtUtils]: Spent 370.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 20:36:43,270 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 20:36:44,306 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification that was a NOOP. DAG size: 167 [2020-07-21 20:36:45,364 WARN L193 SmtUtils]: Spent 319.00 ms on a formula simplification that was a NOOP. DAG size: 162 [2020-07-21 20:36:46,400 WARN L193 SmtUtils]: Spent 306.00 ms on a formula simplification that was a NOOP. DAG size: 157 [2020-07-21 20:36:47,458 WARN L193 SmtUtils]: Spent 298.00 ms on a formula simplification that was a NOOP. DAG size: 152 [2020-07-21 20:36:48,450 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification that was a NOOP. DAG size: 147 [2020-07-21 20:36:49,457 WARN L193 SmtUtils]: Spent 284.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 20:36:50,403 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification that was a NOOP. DAG size: 137 [2020-07-21 20:36:51,318 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 20:36:52,195 WARN L193 SmtUtils]: Spent 230.00 ms on a formula simplification that was a NOOP. DAG size: 127 [2020-07-21 20:36:53,087 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification that was a NOOP. DAG size: 122 [2020-07-21 20:36:53,930 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 117 [2020-07-21 20:36:54,743 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 20:36:55,509 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification that was a NOOP. DAG size: 107 [2020-07-21 20:36:56,200 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 20:36:56,842 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 20:36:57,573 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 92 [2020-07-21 20:36:58,203 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 20:36:58,785 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 20:36:59,462 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 20:37:00,105 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 72 [2020-07-21 20:37:00,748 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 20:37:07,314 WARN L193 SmtUtils]: Spent 608.00 ms on a formula simplification that was a NOOP. DAG size: 237 [2020-07-21 20:37:07,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 20:37:07,340 INFO L93 Difference]: Finished difference Result 115 states and 162 transitions. [2020-07-21 20:37:07,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 20:37:07,342 INFO L78 Accepts]: Start accepts. Automaton has 101 states. Word has length 58 [2020-07-21 20:37:07,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 20:37:07,344 INFO L225 Difference]: With dead ends: 115 [2020-07-21 20:37:07,344 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 20:37:07,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 167 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1598 ImplicationChecksByTransitivity, 52.3s TimeCoverageRelationStatistics Valid=7328, Invalid=15928, Unknown=0, NotChecked=0, Total=23256 [2020-07-21 20:37:07,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 20:37:07,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-21 20:37:07,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 20:37:07,380 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-21 20:37:07,380 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-21 20:37:07,381 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 20:37:07,381 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-21 20:37:07,381 INFO L480 AbstractCegarLoop]: Interpolant automaton has 101 states. [2020-07-21 20:37:07,381 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-21 20:37:07,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 20:37:07,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 20:37:07,386 INFO L422 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 20:37:07,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 20:37:07,601 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 20:37:07,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 20:37:07,602 INFO L82 PathProgramCache]: Analyzing trace with hash -236770320, now seen corresponding path program 6 times [2020-07-21 20:37:07,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 20:37:07,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1664263588] [2020-07-21 20:37:07,603 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 20:37:07,762 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 20:37:07,762 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 20:37:07,780 WARN L261 TraceCheckSpWp]: Trace formula consists of 507 conjuncts, 387 conjunts are in the unsatisfiable core [2020-07-21 20:37:07,790 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 20:37:21,501 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:37:21,502 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 20:37:22,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 20:38:03,539 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 20:38:03,539 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1664263588] [2020-07-21 20:38:03,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 20:38:03,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101] total 197 [2020-07-21 20:38:03,540 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1486544063] [2020-07-21 20:38:03,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 197 states [2020-07-21 20:38:03,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 20:38:03,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 197 interpolants. [2020-07-21 20:38:03,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9421, Invalid=29191, Unknown=0, NotChecked=0, Total=38612 [2020-07-21 20:38:03,551 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 197 states. [2020-07-21 20:38:37,220 WARN L193 SmtUtils]: Spent 2.46 s on a formula simplification that was a NOOP. DAG size: 482 [2020-07-21 20:38:42,978 WARN L193 SmtUtils]: Spent 4.45 s on a formula simplification. DAG size of input: 480 DAG size of output: 386 [2020-07-21 20:39:03,009 WARN L193 SmtUtils]: Spent 3.31 s on a formula simplification that was a NOOP. DAG size: 477 [2020-07-21 20:39:08,859 WARN L193 SmtUtils]: Spent 5.00 s on a formula simplification. DAG size of input: 479 DAG size of output: 385 [2020-07-21 20:39:28,575 WARN L193 SmtUtils]: Spent 3.42 s on a formula simplification that was a NOOP. DAG size: 472 [2020-07-21 20:39:50,074 WARN L193 SmtUtils]: Spent 3.79 s on a formula simplification that was a NOOP. DAG size: 467 [2020-07-21 20:40:14,900 WARN L193 SmtUtils]: Spent 3.66 s on a formula simplification that was a NOOP. DAG size: 462 [2020-07-21 20:40:39,146 WARN L193 SmtUtils]: Spent 3.52 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-21 20:41:02,976 WARN L193 SmtUtils]: Spent 3.80 s on a formula simplification that was a NOOP. DAG size: 452 [2020-07-21 20:41:27,305 WARN L193 SmtUtils]: Spent 3.61 s on a formula simplification that was a NOOP. DAG size: 447 [2020-07-21 20:41:55,938 WARN L193 SmtUtils]: Spent 4.30 s on a formula simplification that was a NOOP. DAG size: 442 [2020-07-21 20:42:25,210 WARN L193 SmtUtils]: Spent 4.35 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-21 20:42:54,702 WARN L193 SmtUtils]: Spent 3.67 s on a formula simplification that was a NOOP. DAG size: 432 [2020-07-21 20:43:23,973 WARN L193 SmtUtils]: Spent 4.52 s on a formula simplification that was a NOOP. DAG size: 427 [2020-07-21 20:43:53,538 WARN L193 SmtUtils]: Spent 4.42 s on a formula simplification that was a NOOP. DAG size: 422 [2020-07-21 20:44:25,874 WARN L193 SmtUtils]: Spent 4.73 s on a formula simplification that was a NOOP. DAG size: 417 [2020-07-21 20:44:58,875 WARN L193 SmtUtils]: Spent 4.55 s on a formula simplification that was a NOOP. DAG size: 412 [2020-07-21 20:45:31,974 WARN L193 SmtUtils]: Spent 4.76 s on a formula simplification that was a NOOP. DAG size: 407 [2020-07-21 20:46:03,920 WARN L193 SmtUtils]: Spent 4.15 s on a formula simplification that was a NOOP. DAG size: 402 [2020-07-21 20:46:37,642 WARN L193 SmtUtils]: Spent 4.88 s on a formula simplification that was a NOOP. DAG size: 397 [2020-07-21 20:47:05,104 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 20:47:27,875 WARN L193 SmtUtils]: Spent 3.44 s on a formula simplification that was a NOOP. DAG size: 387 [2020-07-21 20:47:50,374 WARN L193 SmtUtils]: Spent 3.41 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 20:48:12,799 WARN L193 SmtUtils]: Spent 3.27 s on a formula simplification that was a NOOP. DAG size: 377 [2020-07-21 20:48:35,012 WARN L193 SmtUtils]: Spent 3.24 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 20:48:57,627 WARN L193 SmtUtils]: Spent 3.37 s on a formula simplification that was a NOOP. DAG size: 367 [2020-07-21 20:49:20,582 WARN L193 SmtUtils]: Spent 3.36 s on a formula simplification that was a NOOP. DAG size: 362 [2020-07-21 20:49:43,160 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 357 [2020-07-21 20:50:03,733 WARN L193 SmtUtils]: Spent 3.02 s on a formula simplification that was a NOOP. DAG size: 352