/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/cggmp2005_variant.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 01:49:39,632 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-07-21 01:49:39,689 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 01:49:39,692 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 01:49:39,695 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 01:49:39,697 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 01:49:39,700 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 01:49:39,702 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 01:49:39,704 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 01:49:39,710 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 01:49:39,715 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 01:49:39,719 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 01:49:39,720 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 01:49:39,721 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 01:49:39,723 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 01:49:39,734 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 01:49:39,735 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 01:49:39,737 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 01:49:39,738 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 01:49:39,774 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 01:49:39,775 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 01:49:39,776 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 01:49:39,779 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 01:49:39,780 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 01:49:39,780 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 01:49:39,780 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 01:49:39,780 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 01:49:39,780 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 01:49:39,781 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 01:49:39,781 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 01:49:39,781 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 01:49:39,781 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 01:49:39,781 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 01:49:39,785 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 01:49:39,785 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 01:49:39,786 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 01:49:39,786 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 01:49:39,786 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 01:49:39,786 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 01:49:39,786 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 01:49:39,786 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 01:49:39,787 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 01:49:39,787 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 01:49:39,787 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 01:49:39,788 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 01:49:39,788 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:39,789 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 01:49:39,789 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 01:49:39,789 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 01:49:40,120 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 01:49:40,135 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 01:49:40,139 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 01:49:40,141 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 01:49:40,142 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 01:49:40,143 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 01:49:40,216 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/571c3273b/febf3a97f8c94969b46e772ecb191b14/FLAG7b9526ac2 [2020-07-21 01:49:40,692 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 01:49:40,693 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-lit/cggmp2005_variant.i [2020-07-21 01:49:40,699 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/571c3273b/febf3a97f8c94969b46e772ecb191b14/FLAG7b9526ac2 [2020-07-21 01:49:41,180 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/571c3273b/febf3a97f8c94969b46e772ecb191b14 [2020-07-21 01:49:41,191 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 01:49:41,194 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 01:49:41,195 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 01:49:41,196 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 01:49:41,201 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 01:49:41,202 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,205 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1c580c07 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41, skipping insertion in model container [2020-07-21 01:49:41,205 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,214 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 01:49:41,237 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 01:49:41,462 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:49:41,466 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 01:49:41,481 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 01:49:41,495 INFO L208 MainTranslator]: Completed translation [2020-07-21 01:49:41,496 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41 WrapperNode [2020-07-21 01:49:41,496 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 01:49:41,497 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 01:49:41,497 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 01:49:41,497 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 01:49:41,513 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,513 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,521 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,526 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,530 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,531 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (1/1) ... [2020-07-21 01:49:41,623 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 01:49:41,625 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 01:49:41,625 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 01:49:41,626 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 01:49:41,628 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (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 01:49:41,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 01:49:41,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 01:49:41,709 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-21 01:49:41,710 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 01:49:41,710 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 01:49:41,711 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 01:49:41,711 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-21 01:49:41,712 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-21 01:49:41,712 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 01:49:41,712 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 01:49:41,713 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 01:49:41,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 01:49:41,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 01:49:41,904 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 01:49:41,904 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 01:49:41,908 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:49:41 BoogieIcfgContainer [2020-07-21 01:49:41,909 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 01:49:41,910 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 01:49:41,910 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 01:49:41,913 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 01:49:41,913 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 01:49:41" (1/3) ... [2020-07-21 01:49:41,914 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623ed315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:49:41, skipping insertion in model container [2020-07-21 01:49:41,914 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 01:49:41" (2/3) ... [2020-07-21 01:49:41,915 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@623ed315 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 01:49:41, skipping insertion in model container [2020-07-21 01:49:41,915 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 01:49:41" (3/3) ... [2020-07-21 01:49:41,917 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005_variant.i [2020-07-21 01:49:41,927 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 01:49:41,935 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 01:49:41,950 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 01:49:41,974 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 01:49:41,974 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 01:49:41,974 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 01:49:41,974 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 01:49:41,975 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 01:49:41,975 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 01:49:41,975 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 01:49:41,975 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 01:49:41,994 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-07-21 01:49:41,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 01:49:41,999 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:42,001 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:42,001 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:42,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:42,008 INFO L82 PathProgramCache]: Analyzing trace with hash 1608903343, now seen corresponding path program 1 times [2020-07-21 01:49:42,016 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:42,016 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585877608] [2020-07-21 01:49:42,017 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 01:49:42,122 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:49:42,123 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:42,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 27 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 01:49:42,133 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:42,187 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 01:49:42,187 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 01:49:42,189 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585877608] [2020-07-21 01:49:42,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 01:49:42,190 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 01:49:42,192 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1261919580] [2020-07-21 01:49:42,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 01:49:42,200 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:42,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 01:49:42,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:49:42,224 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-07-21 01:49:42,267 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:42,268 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-07-21 01:49:42,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 01:49:42,272 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2020-07-21 01:49:42,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:42,281 INFO L225 Difference]: With dead ends: 32 [2020-07-21 01:49:42,281 INFO L226 Difference]: Without dead ends: 13 [2020-07-21 01:49:42,284 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 01:49:42,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-07-21 01:49:42,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-07-21 01:49:42,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-07-21 01:49:42,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-07-21 01:49:42,319 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-07-21 01:49:42,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:42,320 INFO L479 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-07-21 01:49:42,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 01:49:42,320 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-07-21 01:49:42,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-07-21 01:49:42,321 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:42,321 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:42,522 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:42,522 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:42,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:42,524 INFO L82 PathProgramCache]: Analyzing trace with hash -1628066164, now seen corresponding path program 1 times [2020-07-21 01:49:42,524 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:42,525 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483638532] [2020-07-21 01:49:42,525 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 01:49:42,563 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:42,564 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:42,565 INFO L263 TraceCheckSpWp]: Trace formula consists of 37 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 01:49:42,567 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:42,720 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:49:42,774 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 01:49:42,774 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:42,805 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:42,920 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 01:49:42,921 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483638532] [2020-07-21 01:49:42,921 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:42,922 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 12 [2020-07-21 01:49:42,922 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [433544644] [2020-07-21 01:49:42,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 01:49:42,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:42,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 01:49:42,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 01:49:42,926 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 12 states. [2020-07-21 01:49:43,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:43,024 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-07-21 01:49:43,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 01:49:43,025 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 12 [2020-07-21 01:49:43,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:43,026 INFO L225 Difference]: With dead ends: 19 [2020-07-21 01:49:43,027 INFO L226 Difference]: Without dead ends: 14 [2020-07-21 01:49:43,028 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:49:43,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-07-21 01:49:43,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-07-21 01:49:43,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-07-21 01:49:43,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-07-21 01:49:43,034 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-07-21 01:49:43,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:43,034 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-07-21 01:49:43,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 01:49:43,035 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-07-21 01:49:43,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 01:49:43,036 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:43,036 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:43,250 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:43,250 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:43,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:43,252 INFO L82 PathProgramCache]: Analyzing trace with hash 1105094223, now seen corresponding path program 2 times [2020-07-21 01:49:43,252 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:43,253 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006109689] [2020-07-21 01:49:43,253 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 01:49:43,284 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 01:49:43,285 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:43,286 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 01:49:43,288 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:43,388 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:49:43,438 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:43,439 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:43,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:43,658 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:43,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006109689] [2020-07-21 01:49:43,659 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:43,659 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 14 [2020-07-21 01:49:43,659 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [164874466] [2020-07-21 01:49:43,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 01:49:43,660 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:43,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 01:49:43,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-07-21 01:49:43,661 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 14 states. [2020-07-21 01:49:43,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:43,989 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2020-07-21 01:49:43,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 01:49:43,989 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 13 [2020-07-21 01:49:43,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:43,990 INFO L225 Difference]: With dead ends: 23 [2020-07-21 01:49:43,991 INFO L226 Difference]: Without dead ends: 17 [2020-07-21 01:49:43,992 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=98, Invalid=364, Unknown=0, NotChecked=0, Total=462 [2020-07-21 01:49:43,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-07-21 01:49:43,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-07-21 01:49:43,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-07-21 01:49:43,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-07-21 01:49:43,998 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 13 [2020-07-21 01:49:43,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:43,998 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-07-21 01:49:43,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 01:49:43,999 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-07-21 01:49:43,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-07-21 01:49:43,999 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:44,000 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:44,200 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:44,201 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:44,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:44,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1866925900, now seen corresponding path program 3 times [2020-07-21 01:49:44,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:44,202 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1401432819] [2020-07-21 01:49:44,202 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 01:49:44,244 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:44,245 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:44,246 WARN L261 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-21 01:49:44,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:44,386 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:49:44,428 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:44,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:44,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:44,689 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:44,689 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1401432819] [2020-07-21 01:49:44,690 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:44,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-21 01:49:44,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123343328] [2020-07-21 01:49:44,691 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 01:49:44,691 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:44,692 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 01:49:44,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2020-07-21 01:49:44,693 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 19 states. [2020-07-21 01:49:45,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:45,471 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 01:49:45,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-21 01:49:45,472 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 16 [2020-07-21 01:49:45,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:45,473 INFO L225 Difference]: With dead ends: 29 [2020-07-21 01:49:45,473 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 01:49:45,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=226, Invalid=830, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 01:49:45,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 01:49:45,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-07-21 01:49:45,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-07-21 01:49:45,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-07-21 01:49:45,482 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 16 [2020-07-21 01:49:45,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:45,483 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-07-21 01:49:45,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 01:49:45,483 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-07-21 01:49:45,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-07-21 01:49:45,484 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:45,484 INFO L422 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:45,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:45,698 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:45,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:45,699 INFO L82 PathProgramCache]: Analyzing trace with hash 1577490540, now seen corresponding path program 4 times [2020-07-21 01:49:45,700 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:45,700 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [457482758] [2020-07-21 01:49:45,701 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 01:49:45,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:45,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:45,744 WARN L261 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 74 conjunts are in the unsatisfiable core [2020-07-21 01:49:45,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:46,022 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:49:46,073 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:46,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:46,115 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:46,747 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:46,748 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [457482758] [2020-07-21 01:49:46,748 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:46,748 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 32 [2020-07-21 01:49:46,749 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140414961] [2020-07-21 01:49:46,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-21 01:49:46,750 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:46,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-21 01:49:46,751 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2020-07-21 01:49:46,751 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 32 states. [2020-07-21 01:49:47,393 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-21 01:49:47,601 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 88 DAG size of output: 60 [2020-07-21 01:49:47,910 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 78 DAG size of output: 50 [2020-07-21 01:49:49,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:49:49,084 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 01:49:49,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-21 01:49:49,087 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 22 [2020-07-21 01:49:49,088 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:49:49,089 INFO L225 Difference]: With dead ends: 41 [2020-07-21 01:49:49,089 INFO L226 Difference]: Without dead ends: 35 [2020-07-21 01:49:49,091 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 11 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=719, Invalid=2587, Unknown=0, NotChecked=0, Total=3306 [2020-07-21 01:49:49,091 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-07-21 01:49:49,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-07-21 01:49:49,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 01:49:49,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-07-21 01:49:49,102 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 22 [2020-07-21 01:49:49,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:49:49,102 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-07-21 01:49:49,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-21 01:49:49,102 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-07-21 01:49:49,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-07-21 01:49:49,103 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:49:49,104 INFO L422 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:49:49,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:49:49,317 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:49:49,318 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:49:49,318 INFO L82 PathProgramCache]: Analyzing trace with hash -718556500, now seen corresponding path program 5 times [2020-07-21 01:49:49,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:49:49,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1008673329] [2020-07-21 01:49:49,320 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 01:49:49,375 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:49:49,376 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:49:49,379 WARN L261 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 146 conjunts are in the unsatisfiable core [2020-07-21 01:49:49,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:49:50,067 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:49:50,160 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:50,160 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:49:50,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:49:52,083 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:49:52,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1008673329] [2020-07-21 01:49:52,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:49:52,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 55 [2020-07-21 01:49:52,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564532909] [2020-07-21 01:49:52,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-07-21 01:49:52,085 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:49:52,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-07-21 01:49:52,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=641, Invalid=2329, Unknown=0, NotChecked=0, Total=2970 [2020-07-21 01:49:52,087 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 55 states. [2020-07-21 01:49:53,815 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification that was a NOOP. DAG size: 165 [2020-07-21 01:49:54,260 WARN L193 SmtUtils]: Spent 353.00 ms on a formula simplification. DAG size of input: 166 DAG size of output: 108 [2020-07-21 01:49:54,644 WARN L193 SmtUtils]: Spent 195.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 01:49:55,022 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 156 DAG size of output: 98 [2020-07-21 01:49:55,385 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 01:49:55,812 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 01:49:56,149 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 01:49:56,510 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 01:49:56,831 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 01:49:57,143 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 01:49:57,456 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 01:49:57,755 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 01:49:58,026 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 01:49:59,047 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:50:01,171 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification that was a NOOP. DAG size: 155 [2020-07-21 01:50:01,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:50:01,181 INFO L93 Difference]: Finished difference Result 65 states and 88 transitions. [2020-07-21 01:50:01,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-21 01:50:01,182 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 34 [2020-07-21 01:50:01,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:50:01,183 INFO L225 Difference]: With dead ends: 65 [2020-07-21 01:50:01,184 INFO L226 Difference]: Without dead ends: 59 [2020-07-21 01:50:01,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1439 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=2548, Invalid=8372, Unknown=0, NotChecked=0, Total=10920 [2020-07-21 01:50:01,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-07-21 01:50:01,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2020-07-21 01:50:01,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-07-21 01:50:01,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-07-21 01:50:01,203 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 34 [2020-07-21 01:50:01,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:50:01,204 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-07-21 01:50:01,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-07-21 01:50:01,204 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-07-21 01:50:01,206 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-07-21 01:50:01,206 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:50:01,206 INFO L422 BasicCegarLoop]: trace histogram [47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:50:01,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:50:01,412 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:50:01,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:50:01,413 INFO L82 PathProgramCache]: Analyzing trace with hash 944097068, now seen corresponding path program 6 times [2020-07-21 01:50:01,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:50:01,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067664668] [2020-07-21 01:50:01,414 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 01:50:01,503 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:50:01,503 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:50:01,511 WARN L261 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 290 conjunts are in the unsatisfiable core [2020-07-21 01:50:01,516 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:50:03,828 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:50:04,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:50:04,005 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:50:04,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:50:11,148 INFO L134 CoverageAnalysis]: Checked inductivity of 1128 backedges. 0 proven. 1128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:50:11,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067664668] [2020-07-21 01:50:11,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:50:11,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54] total 103 [2020-07-21 01:50:11,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883386591] [2020-07-21 01:50:11,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 103 states [2020-07-21 01:50:11,150 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:50:11,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2020-07-21 01:50:11,154 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2417, Invalid=8089, Unknown=0, NotChecked=0, Total=10506 [2020-07-21 01:50:11,155 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 103 states. [2020-07-21 01:50:17,342 WARN L193 SmtUtils]: Spent 630.00 ms on a formula simplification that was a NOOP. DAG size: 321 [2020-07-21 01:50:18,515 WARN L193 SmtUtils]: Spent 877.00 ms on a formula simplification. DAG size of input: 322 DAG size of output: 204 [2020-07-21 01:50:19,948 WARN L193 SmtUtils]: Spent 607.00 ms on a formula simplification that was a NOOP. DAG size: 307 [2020-07-21 01:50:20,934 WARN L193 SmtUtils]: Spent 766.00 ms on a formula simplification. DAG size of input: 312 DAG size of output: 194 [2020-07-21 01:50:22,252 WARN L193 SmtUtils]: Spent 554.00 ms on a formula simplification that was a NOOP. DAG size: 301 [2020-07-21 01:50:23,719 WARN L193 SmtUtils]: Spent 536.00 ms on a formula simplification that was a NOOP. DAG size: 294 [2020-07-21 01:50:25,034 WARN L193 SmtUtils]: Spent 533.00 ms on a formula simplification that was a NOOP. DAG size: 288 [2020-07-21 01:50:26,377 WARN L193 SmtUtils]: Spent 522.00 ms on a formula simplification that was a NOOP. DAG size: 281 [2020-07-21 01:50:27,670 WARN L193 SmtUtils]: Spent 497.00 ms on a formula simplification that was a NOOP. DAG size: 275 [2020-07-21 01:50:28,952 WARN L193 SmtUtils]: Spent 485.00 ms on a formula simplification that was a NOOP. DAG size: 268 [2020-07-21 01:50:30,224 WARN L193 SmtUtils]: Spent 476.00 ms on a formula simplification that was a NOOP. DAG size: 262 [2020-07-21 01:50:31,509 WARN L193 SmtUtils]: Spent 464.00 ms on a formula simplification that was a NOOP. DAG size: 255 [2020-07-21 01:50:32,719 WARN L193 SmtUtils]: Spent 435.00 ms on a formula simplification that was a NOOP. DAG size: 249 [2020-07-21 01:50:33,933 WARN L193 SmtUtils]: Spent 443.00 ms on a formula simplification that was a NOOP. DAG size: 242 [2020-07-21 01:50:35,106 WARN L193 SmtUtils]: Spent 412.00 ms on a formula simplification that was a NOOP. DAG size: 236 [2020-07-21 01:50:36,232 WARN L193 SmtUtils]: Spent 394.00 ms on a formula simplification that was a NOOP. DAG size: 229 [2020-07-21 01:50:37,407 WARN L193 SmtUtils]: Spent 419.00 ms on a formula simplification that was a NOOP. DAG size: 223 [2020-07-21 01:50:38,540 WARN L193 SmtUtils]: Spent 372.00 ms on a formula simplification that was a NOOP. DAG size: 216 [2020-07-21 01:50:39,647 WARN L193 SmtUtils]: Spent 365.00 ms on a formula simplification that was a NOOP. DAG size: 210 [2020-07-21 01:50:40,727 WARN L193 SmtUtils]: Spent 361.00 ms on a formula simplification that was a NOOP. DAG size: 203 [2020-07-21 01:50:41,778 WARN L193 SmtUtils]: Spent 327.00 ms on a formula simplification that was a NOOP. DAG size: 197 [2020-07-21 01:50:42,798 WARN L193 SmtUtils]: Spent 313.00 ms on a formula simplification that was a NOOP. DAG size: 190 [2020-07-21 01:50:43,800 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification that was a NOOP. DAG size: 184 [2020-07-21 01:50:44,758 WARN L193 SmtUtils]: Spent 283.00 ms on a formula simplification that was a NOOP. DAG size: 177 [2020-07-21 01:50:45,686 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 171 [2020-07-21 01:50:46,604 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification that was a NOOP. DAG size: 164 [2020-07-21 01:50:47,531 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification that was a NOOP. DAG size: 158 [2020-07-21 01:50:48,414 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification that was a NOOP. DAG size: 151 [2020-07-21 01:50:49,295 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification that was a NOOP. DAG size: 145 [2020-07-21 01:50:50,169 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification that was a NOOP. DAG size: 138 [2020-07-21 01:50:50,955 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification that was a NOOP. DAG size: 132 [2020-07-21 01:50:51,748 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 125 [2020-07-21 01:50:52,487 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification that was a NOOP. DAG size: 119 [2020-07-21 01:50:53,248 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification that was a NOOP. DAG size: 112 [2020-07-21 01:50:53,951 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 106 [2020-07-21 01:50:54,632 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 99 [2020-07-21 01:50:55,288 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 93 [2020-07-21 01:50:55,950 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 86 [2020-07-21 01:50:56,620 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-21 01:50:57,231 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 01:50:57,810 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 01:51:03,175 WARN L193 SmtUtils]: Spent 651.00 ms on a formula simplification that was a NOOP. DAG size: 311 [2020-07-21 01:51:03,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 01:51:03,191 INFO L93 Difference]: Finished difference Result 113 states and 160 transitions. [2020-07-21 01:51:03,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2020-07-21 01:51:03,192 INFO L78 Accepts]: Start accepts. Automaton has 103 states. Word has length 58 [2020-07-21 01:51:03,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 01:51:03,194 INFO L225 Difference]: With dead ends: 113 [2020-07-21 01:51:03,194 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 01:51:03,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5183 ImplicationChecksByTransitivity, 57.5s TimeCoverageRelationStatistics Valid=9676, Invalid=30524, Unknown=0, NotChecked=0, Total=40200 [2020-07-21 01:51:03,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 01:51:03,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 107. [2020-07-21 01:51:03,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-21 01:51:03,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-07-21 01:51:03,237 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 58 [2020-07-21 01:51:03,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 01:51:03,238 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-07-21 01:51:03,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 103 states. [2020-07-21 01:51:03,238 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-07-21 01:51:03,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-21 01:51:03,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 01:51:03,241 INFO L422 BasicCegarLoop]: trace histogram [95, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 01:51:03,455 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 01:51:03,456 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 01:51:03,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 01:51:03,457 INFO L82 PathProgramCache]: Analyzing trace with hash -679907284, now seen corresponding path program 7 times [2020-07-21 01:51:03,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 01:51:03,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214671917] [2020-07-21 01:51:03,458 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 01:51:03,627 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-21 01:51:03,628 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 01:51:03,665 WARN L261 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 578 conjunts are in the unsatisfiable core [2020-07-21 01:51:03,674 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 01:51:15,336 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 4 disjuncts [2020-07-21 01:51:15,838 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:51:15,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 01:51:16,286 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 01:51:59,148 INFO L134 CoverageAnalysis]: Checked inductivity of 4560 backedges. 0 proven. 4560 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 01:51:59,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214671917] [2020-07-21 01:51:59,149 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 01:51:59,149 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102] total 199 [2020-07-21 01:51:59,149 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [547894362] [2020-07-21 01:51:59,150 INFO L459 AbstractCegarLoop]: Interpolant automaton has 199 states [2020-07-21 01:51:59,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 01:51:59,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2020-07-21 01:51:59,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9425, Invalid=29977, Unknown=0, NotChecked=0, Total=39402 [2020-07-21 01:51:59,155 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 199 states. [2020-07-21 01:52:43,814 WARN L193 SmtUtils]: Spent 3.41 s on a formula simplification that was a NOOP. DAG size: 635 [2020-07-21 01:52:48,828 WARN L193 SmtUtils]: Spent 3.88 s on a formula simplification. DAG size of input: 636 DAG size of output: 398 [2020-07-21 01:53:00,287 WARN L193 SmtUtils]: Spent 3.03 s on a formula simplification that was a NOOP. DAG size: 619 [2020-07-21 01:53:04,538 WARN L193 SmtUtils]: Spent 3.33 s on a formula simplification. DAG size of input: 624 DAG size of output: 386 [2020-07-21 01:53:15,542 WARN L193 SmtUtils]: Spent 2.87 s on a formula simplification that was a NOOP. DAG size: 613 [2020-07-21 01:53:26,502 WARN L193 SmtUtils]: Spent 2.81 s on a formula simplification that was a NOOP. DAG size: 606 [2020-07-21 01:53:37,329 WARN L193 SmtUtils]: Spent 2.87 s on a formula simplification that was a NOOP. DAG size: 600 [2020-07-21 01:53:48,346 WARN L193 SmtUtils]: Spent 2.76 s on a formula simplification that was a NOOP. DAG size: 593 [2020-07-21 01:53:59,580 WARN L193 SmtUtils]: Spent 2.98 s on a formula simplification that was a NOOP. DAG size: 587 [2020-07-21 01:54:11,674 WARN L193 SmtUtils]: Spent 3.19 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-21 01:54:24,252 WARN L193 SmtUtils]: Spent 3.17 s on a formula simplification that was a NOOP. DAG size: 574 [2020-07-21 01:54:37,341 WARN L193 SmtUtils]: Spent 2.74 s on a formula simplification that was a NOOP. DAG size: 567 [2020-07-21 01:54:51,843 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 561 [2020-07-21 01:55:06,138 WARN L193 SmtUtils]: Spent 3.32 s on a formula simplification that was a NOOP. DAG size: 554 [2020-07-21 01:55:21,183 WARN L193 SmtUtils]: Spent 3.31 s on a formula simplification that was a NOOP. DAG size: 548 [2020-07-21 01:55:37,550 WARN L193 SmtUtils]: Spent 3.81 s on a formula simplification that was a NOOP. DAG size: 541 [2020-07-21 01:55:53,584 WARN L193 SmtUtils]: Spent 3.30 s on a formula simplification that was a NOOP. DAG size: 535 [2020-07-21 01:56:11,689 WARN L193 SmtUtils]: Spent 3.77 s on a formula simplification that was a NOOP. DAG size: 528 [2020-07-21 01:56:30,195 WARN L193 SmtUtils]: Spent 3.89 s on a formula simplification that was a NOOP. DAG size: 522 [2020-07-21 01:56:49,440 WARN L193 SmtUtils]: Spent 3.76 s on a formula simplification that was a NOOP. DAG size: 515 [2020-07-21 01:57:06,319 WARN L193 SmtUtils]: Spent 3.57 s on a formula simplification that was a NOOP. DAG size: 509 [2020-07-21 01:57:25,263 WARN L193 SmtUtils]: Spent 4.19 s on a formula simplification that was a NOOP. DAG size: 502 [2020-07-21 01:57:46,413 WARN L193 SmtUtils]: Spent 4.15 s on a formula simplification that was a NOOP. DAG size: 496 [2020-07-21 01:58:06,117 WARN L193 SmtUtils]: Spent 3.79 s on a formula simplification that was a NOOP. DAG size: 489 [2020-07-21 01:58:26,400 WARN L193 SmtUtils]: Spent 3.57 s on a formula simplification that was a NOOP. DAG size: 483 [2020-07-21 01:58:45,907 WARN L193 SmtUtils]: Spent 3.59 s on a formula simplification that was a NOOP. DAG size: 476 [2020-07-21 01:59:06,212 WARN L193 SmtUtils]: Spent 3.74 s on a formula simplification that was a NOOP. DAG size: 470 [2020-07-21 01:59:26,455 WARN L193 SmtUtils]: Spent 3.67 s on a formula simplification that was a NOOP. DAG size: 463 [2020-07-21 01:59:44,941 WARN L193 SmtUtils]: Spent 2.64 s on a formula simplification that was a NOOP. DAG size: 457 [2020-07-21 01:59:58,874 WARN L193 SmtUtils]: Spent 2.66 s on a formula simplification that was a NOOP. DAG size: 450 [2020-07-21 02:00:13,014 WARN L193 SmtUtils]: Spent 2.51 s on a formula simplification that was a NOOP. DAG size: 444 [2020-07-21 02:00:27,482 WARN L193 SmtUtils]: Spent 2.62 s on a formula simplification that was a NOOP. DAG size: 437 [2020-07-21 02:00:41,064 WARN L193 SmtUtils]: Spent 2.56 s on a formula simplification that was a NOOP. DAG size: 431 [2020-07-21 02:00:54,924 WARN L193 SmtUtils]: Spent 2.54 s on a formula simplification that was a NOOP. DAG size: 424 [2020-07-21 02:01:09,644 WARN L193 SmtUtils]: Spent 2.66 s on a formula simplification that was a NOOP. DAG size: 418 [2020-07-21 02:01:24,308 WARN L193 SmtUtils]: Spent 2.49 s on a formula simplification that was a NOOP. DAG size: 411 [2020-07-21 02:01:38,154 WARN L193 SmtUtils]: Spent 2.45 s on a formula simplification that was a NOOP. DAG size: 405 [2020-07-21 02:01:52,017 WARN L193 SmtUtils]: Spent 2.43 s on a formula simplification that was a NOOP. DAG size: 398 [2020-07-21 02:02:05,924 WARN L193 SmtUtils]: Spent 2.42 s on a formula simplification that was a NOOP. DAG size: 392 [2020-07-21 02:02:20,102 WARN L193 SmtUtils]: Spent 2.50 s on a formula simplification that was a NOOP. DAG size: 385 [2020-07-21 02:02:34,525 WARN L193 SmtUtils]: Spent 2.44 s on a formula simplification that was a NOOP. DAG size: 379 [2020-07-21 02:02:48,499 WARN L193 SmtUtils]: Spent 2.27 s on a formula simplification that was a NOOP. DAG size: 372 [2020-07-21 02:03:01,932 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 366 [2020-07-21 02:03:15,561 WARN L193 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 359 [2020-07-21 02:03:29,142 WARN L193 SmtUtils]: Spent 2.20 s on a formula simplification that was a NOOP. DAG size: 353 [2020-07-21 02:03:42,224 WARN L193 SmtUtils]: Spent 2.17 s on a formula simplification that was a NOOP. DAG size: 346 [2020-07-21 02:03:55,393 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification that was a NOOP. DAG size: 340