/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/hhk2008.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:53:21,760 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 01:53:21,776 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 01:53:21,778 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 01:53:21,779 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 01:53:21,781 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 01:53:21,783 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 01:53:21,784 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 01:53:21,785 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 01:53:21,787 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 01:53:21,787 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:53:21,788 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:53:21,789 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:53:21,791 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:53:21,791 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:53:21,792 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:53:21,794 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:53:21,796 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:53:21,798 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:53:21,799 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:53:21,801 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:53:21,802 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:53:21,804 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:53:21,813 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:53:21,814 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:53:21,814 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:53:21,815 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 01:53:21,830 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:53:21,830 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:53:21,832 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:53:21,832 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:53:21,832 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:53:21,833 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:53:21,833 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:53:21,833 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:53:21,833 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:53:21,833 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:53:21,834 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:53:21,835 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:53:21,835 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:53:21,835 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:53:21,835 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:53:21,835 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:53:21,836 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:53:21,836 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:53:21,836 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:53:21,836 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:53:21,836 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:53:21,837 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:21,837 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:53:21,837 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:53:21,837 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> BIGGEST_EQUIVALENCE_CLASS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 4 [2020-07-21 01:53:22,162 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:53:22,176 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:53:22,180 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:53:22,182 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:53:22,182 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:53:22,183 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 01:53:22,253 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06772b63c/0360a2c9ad654d7a870eef08842c5de2/FLAG4043c9e60 [2020-07-21 01:53:22,757 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:53:22,758 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/hhk2008.i [2020-07-21 01:53:22,766 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06772b63c/0360a2c9ad654d7a870eef08842c5de2/FLAG4043c9e60 [2020-07-21 01:53:23,152 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/06772b63c/0360a2c9ad654d7a870eef08842c5de2 [2020-07-21 01:53:23,164 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:53:23,168 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:53:23,169 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:53:23,169 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:53:23,174 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:53:23,175 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3a8164e6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23, skipping insertion in model container [2020-07-21 01:53:23,179 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,188 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:53:23,216 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:53:23,432 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:53:23,437 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:53:23,455 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:53:23,471 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:53:23,472 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23 WrapperNode [2020-07-21 01:53:23,472 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:53:23,473 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:53:23,473 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:53:23,473 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:53:23,485 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,490 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,491 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,494 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,499 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,500 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... [2020-07-21 01:53:23,586 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:53:23,587 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:53:23,587 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:53:23,587 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:53:23,588 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:53:23,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:53:23,675 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:53:23,675 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 01:53:23,676 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:53:23,676 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:53:23,677 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:53:23,677 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 01:53:23,678 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 01:53:23,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:53:23,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:53:23,679 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:53:23,679 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:53:23,680 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:53:23,886 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:53:23,886 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:53:23,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:53:23 BoogieIcfgContainer [2020-07-21 01:53:23,890 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:53:23,891 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:53:23,892 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:53:23,895 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:53:23,895 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:53:23" (1/3) ... [2020-07-21 01:53:23,896 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bed55e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:53:23, skipping insertion in model container [2020-07-21 01:53:23,897 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:53:23" (2/3) ... [2020-07-21 01:53:23,897 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4bed55e5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:53:23, skipping insertion in model container [2020-07-21 01:53:23,897 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:53:23" (3/3) ... [2020-07-21 01:53:23,904 INFO L109 eAbstractionObserver]: Analyzing ICFG hhk2008.i [2020-07-21 01:53:23,916 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:53:23,924 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:53:23,940 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:53:23,965 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:53:23,966 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:53:23,966 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:53:23,966 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:53:23,969 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:53:23,970 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:53:23,970 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:53:23,970 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:53:23,992 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-21 01:53:23,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 01:53:23,999 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:24,000 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:24,001 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:24,007 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:24,007 INFO L82 PathProgramCache]: Analyzing trace with hash -677001103, now seen corresponding path program 1 times [2020-07-21 01:53:24,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:24,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [495010808] [2020-07-21 01:53:24,024 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:24,146 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:24,147 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:24,152 INFO L263 TraceCheckSpWp]: Trace formula consists of 35 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 01:53:24,176 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:24,291 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:53:24,350 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:53:24,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [495010808] [2020-07-21 01:53:24,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:53:24,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-21 01:53:24,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263494752] [2020-07-21 01:53:24,359 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 01:53:24,360 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:24,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 01:53:24,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-21 01:53:24,373 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 6 states. [2020-07-21 01:53:24,545 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:24,546 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2020-07-21 01:53:24,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 01:53:24,548 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 12 [2020-07-21 01:53:24,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:24,555 INFO L225 Difference]: With dead ends: 41 [2020-07-21 01:53:24,556 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 01:53:24,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-21 01:53:24,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 01:53:24,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 01:53:24,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 01:53:24,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 01:53:24,604 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 01:53:24,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:24,604 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 01:53:24,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 01:53:24,605 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 01:53:24,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 01:53:24,606 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:24,606 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:24,819 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:24,820 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:24,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:24,821 INFO L82 PathProgramCache]: Analyzing trace with hash 523340046, now seen corresponding path program 1 times [2020-07-21 01:53:24,822 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:24,823 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047988266] [2020-07-21 01:53:24,823 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:24,863 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:53:24,864 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:24,865 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 01:53:24,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:24,945 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:24,998 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 01:53:24,998 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:25,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:53:25,124 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 01:53:25,125 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047988266] [2020-07-21 01:53:25,125 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:25,125 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 01:53:25,126 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682590118] [2020-07-21 01:53:25,127 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 01:53:25,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:25,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 01:53:25,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 01:53:25,129 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 10 states. [2020-07-21 01:53:25,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:25,371 INFO L93 Difference]: Finished difference Result 22 states and 23 transitions. [2020-07-21 01:53:25,372 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 01:53:25,372 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 13 [2020-07-21 01:53:25,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:25,373 INFO L225 Difference]: With dead ends: 22 [2020-07-21 01:53:25,374 INFO L226 Difference]: Without dead ends: 16 [2020-07-21 01:53:25,377 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-07-21 01:53:25,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-07-21 01:53:25,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-07-21 01:53:25,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-07-21 01:53:25,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-07-21 01:53:25,395 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-07-21 01:53:25,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:25,398 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-07-21 01:53:25,398 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 01:53:25,399 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-07-21 01:53:25,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-07-21 01:53:25,399 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:25,400 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:25,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:25,609 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:25,609 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:25,610 INFO L82 PathProgramCache]: Analyzing trace with hash 1555818862, now seen corresponding path program 2 times [2020-07-21 01:53:25,610 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:25,611 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [924836000] [2020-07-21 01:53:25,612 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:25,649 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:25,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:25,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:53:25,653 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:25,731 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:25,762 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 01:53:25,762 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:25,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:53:25,929 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 01:53:25,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [924836000] [2020-07-21 01:53:25,930 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:25,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 01:53:25,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [615998477] [2020-07-21 01:53:25,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:53:25,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:25,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:53:25,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:53:25,933 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 14 states. [2020-07-21 01:53:26,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:26,435 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2020-07-21 01:53:26,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 01:53:26,435 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 15 [2020-07-21 01:53:26,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:26,436 INFO L225 Difference]: With dead ends: 26 [2020-07-21 01:53:26,437 INFO L226 Difference]: Without dead ends: 20 [2020-07-21 01:53:26,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2020-07-21 01:53:26,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-07-21 01:53:26,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-07-21 01:53:26,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-07-21 01:53:26,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-07-21 01:53:26,444 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 15 [2020-07-21 01:53:26,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:26,445 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-07-21 01:53:26,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:53:26,445 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-07-21 01:53:26,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-21 01:53:26,446 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:26,446 INFO L422 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:26,660 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:26,660 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:26,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:26,661 INFO L82 PathProgramCache]: Analyzing trace with hash 399696430, now seen corresponding path program 3 times [2020-07-21 01:53:26,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:26,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [563648532] [2020-07-21 01:53:26,663 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:26,702 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:26,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:26,704 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-21 01:53:26,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:26,881 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:26,924 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 01:53:26,924 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:26,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:53:27,275 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 01:53:27,275 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [563648532] [2020-07-21 01:53:27,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:27,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 22 [2020-07-21 01:53:27,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224493585] [2020-07-21 01:53:27,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 01:53:27,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:27,277 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 01:53:27,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:53:27,278 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 22 states. [2020-07-21 01:53:28,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:28,517 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2020-07-21 01:53:28,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-21 01:53:28,518 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 19 [2020-07-21 01:53:28,518 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:28,519 INFO L225 Difference]: With dead ends: 34 [2020-07-21 01:53:28,520 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 01:53:28,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=352, Invalid=1208, Unknown=0, NotChecked=0, Total=1560 [2020-07-21 01:53:28,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 01:53:28,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 01:53:28,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 01:53:28,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2020-07-21 01:53:28,537 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 19 [2020-07-21 01:53:28,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:28,537 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2020-07-21 01:53:28,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 01:53:28,538 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2020-07-21 01:53:28,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 01:53:28,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:28,539 INFO L422 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:28,753 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:28,754 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:28,755 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:28,755 INFO L82 PathProgramCache]: Analyzing trace with hash -852380754, now seen corresponding path program 4 times [2020-07-21 01:53:28,755 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:28,756 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [703765159] [2020-07-21 01:53:28,758 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:28,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:28,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:28,800 WARN L261 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 68 conjunts are in the unsatisfiable core [2020-07-21 01:53:28,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:29,149 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:29,215 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 01:53:29,215 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:29,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:53:30,160 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 01:53:30,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [703765159] [2020-07-21 01:53:30,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:30,162 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 38 [2020-07-21 01:53:30,162 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [298763988] [2020-07-21 01:53:30,162 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-21 01:53:30,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:30,163 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-21 01:53:30,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=1104, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 01:53:30,164 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 38 states. [2020-07-21 01:53:31,135 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 102 [2020-07-21 01:53:31,416 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 103 DAG size of output: 72 [2020-07-21 01:53:31,634 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 01:53:31,863 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 98 DAG size of output: 68 [2020-07-21 01:53:32,062 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 01:53:32,320 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 01:53:34,155 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 97 [2020-07-21 01:53:34,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:34,173 INFO L93 Difference]: Finished difference Result 50 states and 65 transitions. [2020-07-21 01:53:34,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-07-21 01:53:34,175 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 27 [2020-07-21 01:53:34,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:34,176 INFO L225 Difference]: With dead ends: 50 [2020-07-21 01:53:34,177 INFO L226 Difference]: Without dead ends: 44 [2020-07-21 01:53:34,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 632 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=1192, Invalid=3920, Unknown=0, NotChecked=0, Total=5112 [2020-07-21 01:53:34,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-07-21 01:53:34,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-07-21 01:53:34,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-07-21 01:53:34,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-07-21 01:53:34,193 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 27 [2020-07-21 01:53:34,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:34,194 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-07-21 01:53:34,194 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-21 01:53:34,194 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-07-21 01:53:34,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 01:53:34,195 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:34,196 INFO L422 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:34,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:34,410 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:34,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:34,412 INFO L82 PathProgramCache]: Analyzing trace with hash -2114791762, now seen corresponding path program 5 times [2020-07-21 01:53:34,412 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:34,413 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [969339463] [2020-07-21 01:53:34,413 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:34,469 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:34,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:34,473 WARN L261 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 132 conjunts are in the unsatisfiable core [2020-07-21 01:53:34,480 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:53:35,524 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:53:35,650 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 01:53:35,651 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:53:35,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:53:38,944 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 01:53:38,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [969339463] [2020-07-21 01:53:38,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:53:38,945 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37] total 70 [2020-07-21 01:53:38,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2040803414] [2020-07-21 01:53:38,946 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2020-07-21 01:53:38,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:53:38,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2020-07-21 01:53:38,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1102, Invalid=3728, Unknown=0, NotChecked=0, Total=4830 [2020-07-21 01:53:38,950 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 70 states. [2020-07-21 01:53:42,051 WARN L193 SmtUtils]: Spent 317.00 ms on a formula simplification that was a NOOP. DAG size: 198 [2020-07-21 01:53:42,694 WARN L193 SmtUtils]: Spent 487.00 ms on a formula simplification. DAG size of input: 199 DAG size of output: 136 [2020-07-21 01:53:43,347 WARN L193 SmtUtils]: Spent 307.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 01:53:43,924 WARN L193 SmtUtils]: Spent 450.00 ms on a formula simplification. DAG size of input: 194 DAG size of output: 132 [2020-07-21 01:53:44,579 WARN L193 SmtUtils]: Spent 309.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 01:53:45,276 WARN L193 SmtUtils]: Spent 282.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 01:53:45,888 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 01:53:46,480 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 01:53:47,069 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 01:53:47,610 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 01:53:48,137 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 01:53:48,658 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 01:53:49,205 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 01:53:49,684 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 01:53:50,166 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 01:53:50,642 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 01:53:51,100 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 01:53:51,534 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 01:53:51,953 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 01:53:52,359 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 01:53:52,753 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 01:53:53,126 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 01:53:56,992 WARN L193 SmtUtils]: Spent 330.00 ms on a formula simplification that was a NOOP. DAG size: 193 [2020-07-21 01:53:57,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:53:57,005 INFO L93 Difference]: Finished difference Result 82 states and 113 transitions. [2020-07-21 01:53:57,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2020-07-21 01:53:57,006 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 43 [2020-07-21 01:53:57,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:53:57,007 INFO L225 Difference]: With dead ends: 82 [2020-07-21 01:53:57,008 INFO L226 Difference]: Without dead ends: 76 [2020-07-21 01:53:57,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 134 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2296 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=4408, Invalid=13952, Unknown=0, NotChecked=0, Total=18360 [2020-07-21 01:53:57,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-07-21 01:53:57,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 76. [2020-07-21 01:53:57,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 01:53:57,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 76 transitions. [2020-07-21 01:53:57,035 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 76 transitions. Word has length 43 [2020-07-21 01:53:57,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:53:57,036 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 76 transitions. [2020-07-21 01:53:57,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 70 states. [2020-07-21 01:53:57,036 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 76 transitions. [2020-07-21 01:53:57,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-07-21 01:53:57,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:53:57,038 INFO L422 BasicCegarLoop]: trace histogram [63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:53:57,252 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:57,253 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:53:57,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:53:57,254 INFO L82 PathProgramCache]: Analyzing trace with hash -1115480914, now seen corresponding path program 6 times [2020-07-21 01:53:57,254 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:53:57,255 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1666141356] [2020-07-21 01:53:57,255 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:53:57,329 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:53:57,329 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:53:57,337 WARN L261 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 260 conjunts are in the unsatisfiable core [2020-07-21 01:53:57,342 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:54:01,477 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:54:01,731 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 01:54:01,731 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:54:01,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:54:17,103 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 01:54:17,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1666141356] [2020-07-21 01:54:17,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:54:17,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69] total 134 [2020-07-21 01:54:17,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2116927355] [2020-07-21 01:54:17,112 INFO L459 AbstractCegarLoop]: Interpolant automaton has 134 states [2020-07-21 01:54:17,112 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:54:17,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 134 interpolants. [2020-07-21 01:54:17,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4238, Invalid=13584, Unknown=0, NotChecked=0, Total=17822 [2020-07-21 01:54:17,121 INFO L87 Difference]: Start difference. First operand 76 states and 76 transitions. Second operand 134 states. [2020-07-21 01:54:30,111 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 390 [2020-07-21 01:54:32,123 WARN L193 SmtUtils]: Spent 1.51 s on a formula simplification. DAG size of input: 391 DAG size of output: 264 [2020-07-21 01:54:35,323 WARN L193 SmtUtils]: Spent 1.25 s on a formula simplification that was a NOOP. DAG size: 382 [2020-07-21 01:54:37,123 WARN L193 SmtUtils]: Spent 1.44 s on a formula simplification. DAG size of input: 386 DAG size of output: 260 [2020-07-21 01:54:40,301 WARN L193 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 376 [2020-07-21 01:54:43,691 WARN L193 SmtUtils]: Spent 1.24 s on a formula simplification that was a NOOP. DAG size: 370 [2020-07-21 01:54:46,822 WARN L193 SmtUtils]: Spent 1.22 s on a formula simplification that was a NOOP. DAG size: 364 [2020-07-21 01:54:49,955 WARN L193 SmtUtils]: Spent 1.20 s on a formula simplification that was a NOOP. DAG size: 358 [2020-07-21 01:54:53,096 WARN L193 SmtUtils]: Spent 1.19 s on a formula simplification that was a NOOP. DAG size: 352 [2020-07-21 01:54:56,231 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 01:54:59,327 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 340 [2020-07-21 01:55:02,452 WARN L193 SmtUtils]: Spent 1.16 s on a formula simplification that was a NOOP. DAG size: 334 [2020-07-21 01:55:05,599 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 328 [2020-07-21 01:55:08,799 WARN L193 SmtUtils]: Spent 1.11 s on a formula simplification that was a NOOP. DAG size: 322 [2020-07-21 01:55:12,011 WARN L193 SmtUtils]: Spent 1.13 s on a formula simplification that was a NOOP. DAG size: 316 [2020-07-21 01:55:15,116 WARN L193 SmtUtils]: Spent 1.05 s on a formula simplification that was a NOOP. DAG size: 310 [2020-07-21 01:55:18,241 WARN L193 SmtUtils]: Spent 1.06 s on a formula simplification that was a NOOP. DAG size: 304 [2020-07-21 01:55:21,347 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 298 [2020-07-21 01:55:24,568 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 01:55:27,849 WARN L193 SmtUtils]: Spent 1.07 s on a formula simplification that was a NOOP. DAG size: 286 [2020-07-21 01:55:31,111 WARN L193 SmtUtils]: Spent 1.04 s on a formula simplification that was a NOOP. DAG size: 280 [2020-07-21 01:55:34,305 WARN L193 SmtUtils]: Spent 1.02 s on a formula simplification that was a NOOP. DAG size: 274 [2020-07-21 01:55:37,405 WARN L193 SmtUtils]: Spent 975.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 01:55:40,559 WARN L193 SmtUtils]: Spent 960.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 01:55:43,619 WARN L193 SmtUtils]: Spent 926.00 ms on a formula simplification that was a NOOP. DAG size: 256 [2020-07-21 01:55:46,723 WARN L193 SmtUtils]: Spent 897.00 ms on a formula simplification that was a NOOP. DAG size: 250 [2020-07-21 01:55:49,858 WARN L193 SmtUtils]: Spent 910.00 ms on a formula simplification that was a NOOP. DAG size: 244 [2020-07-21 01:55:52,854 WARN L193 SmtUtils]: Spent 855.00 ms on a formula simplification that was a NOOP. DAG size: 238 [2020-07-21 01:55:55,821 WARN L193 SmtUtils]: Spent 827.00 ms on a formula simplification that was a NOOP. DAG size: 232 [2020-07-21 01:55:58,824 WARN L193 SmtUtils]: Spent 867.00 ms on a formula simplification that was a NOOP. DAG size: 226 [2020-07-21 01:56:01,777 WARN L193 SmtUtils]: Spent 821.00 ms on a formula simplification that was a NOOP. DAG size: 220 [2020-07-21 01:56:04,757 WARN L193 SmtUtils]: Spent 819.00 ms on a formula simplification that was a NOOP. DAG size: 214 [2020-07-21 01:56:07,702 WARN L193 SmtUtils]: Spent 776.00 ms on a formula simplification that was a NOOP. DAG size: 208 [2020-07-21 01:56:10,574 WARN L193 SmtUtils]: Spent 755.00 ms on a formula simplification that was a NOOP. DAG size: 202 [2020-07-21 01:56:13,397 WARN L193 SmtUtils]: Spent 752.00 ms on a formula simplification that was a NOOP. DAG size: 196 [2020-07-21 01:56:16,286 WARN L193 SmtUtils]: Spent 747.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 01:56:19,009 WARN L193 SmtUtils]: Spent 683.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 01:56:21,756 WARN L193 SmtUtils]: Spent 672.00 ms on a formula simplification that was a NOOP. DAG size: 178 [2020-07-21 01:56:24,428 WARN L193 SmtUtils]: Spent 638.00 ms on a formula simplification that was a NOOP. DAG size: 172 [2020-07-21 01:56:27,106 WARN L193 SmtUtils]: Spent 628.00 ms on a formula simplification that was a NOOP. DAG size: 166 [2020-07-21 01:56:29,671 WARN L193 SmtUtils]: Spent 602.00 ms on a formula simplification that was a NOOP. DAG size: 160 [2020-07-21 01:56:32,236 WARN L193 SmtUtils]: Spent 575.00 ms on a formula simplification that was a NOOP. DAG size: 154 [2020-07-21 01:56:34,726 WARN L193 SmtUtils]: Spent 555.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 01:56:37,160 WARN L193 SmtUtils]: Spent 532.00 ms on a formula simplification that was a NOOP. DAG size: 142 [2020-07-21 01:56:39,538 WARN L193 SmtUtils]: Spent 505.00 ms on a formula simplification that was a NOOP. DAG size: 136 [2020-07-21 01:56:41,876 WARN L193 SmtUtils]: Spent 490.00 ms on a formula simplification that was a NOOP. DAG size: 130 [2020-07-21 01:56:44,204 WARN L193 SmtUtils]: Spent 482.00 ms on a formula simplification that was a NOOP. DAG size: 124 [2020-07-21 01:56:46,466 WARN L193 SmtUtils]: Spent 442.00 ms on a formula simplification that was a NOOP. DAG size: 118 [2020-07-21 01:56:48,682 WARN L193 SmtUtils]: Spent 420.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 01:56:50,793 WARN L193 SmtUtils]: Spent 389.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 01:56:52,828 WARN L193 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 100 [2020-07-21 01:56:54,798 WARN L193 SmtUtils]: Spent 348.00 ms on a formula simplification that was a NOOP. DAG size: 94 [2020-07-21 01:56:56,677 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 01:56:58,409 WARN L193 SmtUtils]: Spent 285.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-21 01:57:00,077 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification that was a NOOP. DAG size: 76 [2020-07-21 01:57:01,637 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 01:57:03,143 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 01:57:04,603 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 01:57:05,985 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 01:57:07,265 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 01:57:08,440 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 01:57:09,511 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 34 [2020-07-21 01:57:19,651 WARN L193 SmtUtils]: Spent 2.14 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 01:57:19,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:57:19,672 INFO L93 Difference]: Finished difference Result 146 states and 209 transitions. [2020-07-21 01:57:19,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2020-07-21 01:57:19,674 INFO L78 Accepts]: Start accepts. Automaton has 134 states. Word has length 75 [2020-07-21 01:57:19,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:57:19,677 INFO L225 Difference]: With dead ends: 146 [2020-07-21 01:57:19,677 INFO L226 Difference]: Without dead ends: 140 [2020-07-21 01:57:19,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 15 SyntacticMatches, 2 SemanticMatches, 262 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8696 ImplicationChecksByTransitivity, 193.4s TimeCoverageRelationStatistics Valid=16984, Invalid=52448, Unknown=0, NotChecked=0, Total=69432 [2020-07-21 01:57:19,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 140 states. [2020-07-21 01:57:19,739 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 140 to 140. [2020-07-21 01:57:19,739 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 140 states. [2020-07-21 01:57:19,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 140 states to 140 states and 140 transitions. [2020-07-21 01:57:19,742 INFO L78 Accepts]: Start accepts. Automaton has 140 states and 140 transitions. Word has length 75 [2020-07-21 01:57:19,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:57:19,742 INFO L479 AbstractCegarLoop]: Abstraction has 140 states and 140 transitions. [2020-07-21 01:57:19,742 INFO L480 AbstractCegarLoop]: Interpolant automaton has 134 states. [2020-07-21 01:57:19,743 INFO L276 IsEmpty]: Start isEmpty. Operand 140 states and 140 transitions. [2020-07-21 01:57:19,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2020-07-21 01:57:19,748 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:57:19,748 INFO L422 BasicCegarLoop]: trace histogram [127, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:57:19,954 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:19,955 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:57:19,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:57:19,956 INFO L82 PathProgramCache]: Analyzing trace with hash -858019666, now seen corresponding path program 7 times [2020-07-21 01:57:19,956 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:57:19,957 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [477687459] [2020-07-21 01:57:19,957 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:57:20,112 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:57:20,113 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:57:20,124 WARN L261 TraceCheckSpWp]: Trace formula consists of 670 conjuncts, 516 conjunts are in the unsatisfiable core [2020-07-21 01:57:20,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:57:50,637 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 3 disjuncts [2020-07-21 01:57:51,815 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 01:57:51,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:57:52,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 02:00:13,627 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 02:00:13,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [477687459] [2020-07-21 02:00:13,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 02:00:13,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 133] total 262 [2020-07-21 02:00:13,628 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496071852] [2020-07-21 02:00:13,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 262 states [2020-07-21 02:00:13,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 02:00:13,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 262 interpolants. [2020-07-21 02:00:13,638 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16654, Invalid=51728, Unknown=0, NotChecked=0, Total=68382 [2020-07-21 02:00:13,638 INFO L87 Difference]: Start difference. First operand 140 states and 140 transitions. Second operand 262 states. [2020-07-21 02:03:16,071 WARN L193 SmtUtils]: Spent 8.94 s on a formula simplification that was a NOOP. DAG size: 774 [2020-07-21 02:03:30,506 WARN L193 SmtUtils]: Spent 11.66 s on a formula simplification. DAG size of input: 775 DAG size of output: 520 [2020-07-21 02:04:45,223 WARN L193 SmtUtils]: Spent 12.35 s on a formula simplification that was a NOOP. DAG size: 766 [2020-07-21 02:04:59,319 WARN L193 SmtUtils]: Spent 12.29 s on a formula simplification. DAG size of input: 770 DAG size of output: 516 [2020-07-21 02:06:17,233 WARN L193 SmtUtils]: Spent 12.53 s on a formula simplification that was a NOOP. DAG size: 760 [2020-07-21 02:07:40,754 WARN L193 SmtUtils]: Spent 13.18 s on a formula simplification that was a NOOP. DAG size: 754