/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 NOT_INCREMENTALLY -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 11:37:14,339 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 11:37:14,341 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 11:37:14,355 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 11:37:14,355 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 11:37:14,357 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 11:37:14,358 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 11:37:14,360 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 11:37:14,362 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 11:37:14,363 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 11:37:14,364 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 11:37:14,366 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 11:37:14,366 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 11:37:14,367 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 11:37:14,368 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 11:37:14,369 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 11:37:14,370 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 11:37:14,371 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 11:37:14,373 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 11:37:14,376 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 11:37:14,377 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 11:37:14,378 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 11:37:14,380 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 11:37:14,380 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 11:37:14,383 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 11:37:14,391 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 11:37:14,392 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 11:37:14,392 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 11:37:14,393 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 11:37:14,409 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 11:37:14,410 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 11:37:14,411 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 11:37:14,411 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 11:37:14,411 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 11:37:14,412 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 11:37:14,412 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 11:37:14,412 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 11:37:14,414 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 11:37:14,415 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 11:37:14,415 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 11:37:14,415 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 11:37:14,415 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 11:37:14,415 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 11:37:14,416 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 11:37:14,416 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 11:37:14,416 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 11:37:14,416 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 11:37:14,417 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 11:37:14,417 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 11:37:14,417 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 11:37:14,419 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 11:37:14,419 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 11:37:14,419 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 11:37:14,420 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 11:37:14,420 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 11:37:14,420 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:14,420 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 11:37:14,421 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 11:37:14,421 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 -> NOT_INCREMENTALLY [2020-07-21 11:37:14,715 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 11:37:14,735 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 11:37:14,739 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 11:37:14,740 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 11:37:14,743 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 11:37:14,744 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 11:37:14,824 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89af56de9/f63e94c56b3b424ca58abb2a76b49489/FLAG3daaf030b [2020-07-21 11:37:15,348 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 11:37:15,349 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-07-21 11:37:15,356 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89af56de9/f63e94c56b3b424ca58abb2a76b49489/FLAG3daaf030b [2020-07-21 11:37:15,750 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/89af56de9/f63e94c56b3b424ca58abb2a76b49489 [2020-07-21 11:37:15,763 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 11:37:15,767 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 11:37:15,768 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 11:37:15,768 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 11:37:15,772 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 11:37:15,773 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:37:15" (1/1) ... [2020-07-21 11:37:15,776 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1269b35 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:15, skipping insertion in model container [2020-07-21 11:37:15,777 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 11:37:15" (1/1) ... [2020-07-21 11:37:15,787 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 11:37:15,810 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 11:37:15,990 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:37:15,998 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 11:37:16,018 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 11:37:16,035 INFO L208 MainTranslator]: Completed translation [2020-07-21 11:37:16,035 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16 WrapperNode [2020-07-21 11:37:16,035 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 11:37:16,036 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 11:37:16,036 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 11:37:16,036 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 11:37:16,139 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,139 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,154 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,154 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,176 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,186 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,192 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (1/1) ... [2020-07-21 11:37:16,194 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 11:37:16,194 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 11:37:16,195 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 11:37:16,195 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 11:37:16,200 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (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 11:37:16,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 11:37:16,257 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 11:37:16,258 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 11:37:16,258 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-07-21 11:37:16,258 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 11:37:16,258 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 11:37:16,258 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 11:37:16,258 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-07-21 11:37:16,259 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-07-21 11:37:16,259 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-07-21 11:37:16,259 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-07-21 11:37:16,259 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-07-21 11:37:16,259 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 11:37:16,260 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-07-21 11:37:16,260 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-07-21 11:37:16,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-07-21 11:37:16,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 11:37:16,260 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 11:37:16,566 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 11:37:16,567 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-21 11:37:16,572 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:37:16 BoogieIcfgContainer [2020-07-21 11:37:16,573 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 11:37:16,585 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 11:37:16,586 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 11:37:16,597 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 11:37:16,598 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 11:37:15" (1/3) ... [2020-07-21 11:37:16,599 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e7ac57f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:37:16, skipping insertion in model container [2020-07-21 11:37:16,599 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 11:37:16" (2/3) ... [2020-07-21 11:37:16,600 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e7ac57f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 11:37:16, skipping insertion in model container [2020-07-21 11:37:16,600 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 11:37:16" (3/3) ... [2020-07-21 11:37:16,602 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-07-21 11:37:16,618 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 11:37:16,625 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 11:37:16,638 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 11:37:16,663 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 11:37:16,663 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 11:37:16,663 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 11:37:16,664 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 11:37:16,664 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 11:37:16,664 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 11:37:16,664 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 11:37:16,664 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 11:37:16,681 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 11:37:16,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:37:16,687 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:16,688 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:16,689 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:16,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:16,695 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-07-21 11:37:16,702 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:16,703 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116183835] [2020-07-21 11:37:16,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:16,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:16,816 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 1 conjunts are in the unsatisfiable core [2020-07-21 11:37:16,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:16,847 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 11:37:16,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:37:16,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116183835] [2020-07-21 11:37:16,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:37:16,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-07-21 11:37:16,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1616276193] [2020-07-21 11:37:16,856 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-07-21 11:37:16,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:16,872 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-07-21 11:37:16,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:37:16,875 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 2 states. [2020-07-21 11:37:16,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:16,898 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2020-07-21 11:37:16,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-07-21 11:37:16,900 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2020-07-21 11:37:16,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:16,908 INFO L225 Difference]: With dead ends: 56 [2020-07-21 11:37:16,908 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 11:37:16,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-07-21 11:37:16,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 11:37:16,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2020-07-21 11:37:16,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-07-21 11:37:16,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-07-21 11:37:16,953 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-07-21 11:37:16,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:16,954 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-07-21 11:37:16,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-07-21 11:37:16,954 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-07-21 11:37:16,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 11:37:16,955 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:16,956 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:17,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:17,171 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:17,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:17,172 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-07-21 11:37:17,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:17,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130945310] [2020-07-21 11:37:17,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:17,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:17,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 11:37:17,230 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:17,265 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 11:37:17,266 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:37:17,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130945310] [2020-07-21 11:37:17,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:37:17,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:37:17,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037934441] [2020-07-21 11:37:17,269 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:37:17,269 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:17,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:37:17,270 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:37:17,270 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 3 states. [2020-07-21 11:37:17,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:17,309 INFO L93 Difference]: Finished difference Result 48 states and 57 transitions. [2020-07-21 11:37:17,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:37:17,310 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 20 [2020-07-21 11:37:17,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:17,314 INFO L225 Difference]: With dead ends: 48 [2020-07-21 11:37:17,314 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:37:17,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 18 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 11:37:17,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:37:17,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 29. [2020-07-21 11:37:17,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 11:37:17,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-07-21 11:37:17,329 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-07-21 11:37:17,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:17,329 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-07-21 11:37:17,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:37:17,330 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-07-21 11:37:17,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:37:17,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:17,331 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:17,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:17,546 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:17,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:17,548 INFO L82 PathProgramCache]: Analyzing trace with hash 387293505, now seen corresponding path program 1 times [2020-07-21 11:37:17,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:17,549 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925629256] [2020-07-21 11:37:17,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:17,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:17,601 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 2 conjunts are in the unsatisfiable core [2020-07-21 11:37:17,603 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:17,624 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 11:37:17,625 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:37:17,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925629256] [2020-07-21 11:37:17,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:37:17,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 11:37:17,626 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719009989] [2020-07-21 11:37:17,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 11:37:17,627 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:17,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 11:37:17,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 11:37:17,627 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 3 states. [2020-07-21 11:37:17,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:17,646 INFO L93 Difference]: Finished difference Result 47 states and 55 transitions. [2020-07-21 11:37:17,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 11:37:17,647 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 23 [2020-07-21 11:37:17,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:17,648 INFO L225 Difference]: With dead ends: 47 [2020-07-21 11:37:17,648 INFO L226 Difference]: Without dead ends: 29 [2020-07-21 11:37:17,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 21 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 11:37:17,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-07-21 11:37:17,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-07-21 11:37:17,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-07-21 11:37:17,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 32 transitions. [2020-07-21 11:37:17,656 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 32 transitions. Word has length 23 [2020-07-21 11:37:17,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:17,656 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 32 transitions. [2020-07-21 11:37:17,656 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 11:37:17,657 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 32 transitions. [2020-07-21 11:37:17,657 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-07-21 11:37:17,657 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:17,658 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:17,871 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:17,872 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:17,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:17,873 INFO L82 PathProgramCache]: Analyzing trace with hash -5733505, now seen corresponding path program 1 times [2020-07-21 11:37:17,873 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:17,874 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531935440] [2020-07-21 11:37:17,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:17,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:17,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 11:37:17,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:17,951 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:17,952 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 11:37:17,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531935440] [2020-07-21 11:37:17,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 11:37:17,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-21 11:37:17,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1558531536] [2020-07-21 11:37:17,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-21 11:37:17,954 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:17,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-21 11:37:17,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-07-21 11:37:17,955 INFO L87 Difference]: Start difference. First operand 29 states and 32 transitions. Second operand 4 states. [2020-07-21 11:37:17,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:17,992 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2020-07-21 11:37:17,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-21 11:37:17,993 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 23 [2020-07-21 11:37:17,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:17,995 INFO L225 Difference]: With dead ends: 50 [2020-07-21 11:37:17,995 INFO L226 Difference]: Without dead ends: 31 [2020-07-21 11:37:17,996 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-07-21 11:37:17,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-07-21 11:37:18,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2020-07-21 11:37:18,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 11:37:18,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 33 transitions. [2020-07-21 11:37:18,002 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 33 transitions. Word has length 23 [2020-07-21 11:37:18,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:18,003 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 33 transitions. [2020-07-21 11:37:18,003 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-21 11:37:18,003 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 33 transitions. [2020-07-21 11:37:18,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-21 11:37:18,004 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:18,005 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:18,211 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:18,212 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:18,212 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:18,213 INFO L82 PathProgramCache]: Analyzing trace with hash 20292413, now seen corresponding path program 1 times [2020-07-21 11:37:18,213 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:18,213 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [147961950] [2020-07-21 11:37:18,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:18,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:18,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 11:37:18,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:18,346 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:18,347 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:18,465 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:18,467 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [147961950] [2020-07-21 11:37:18,467 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:18,468 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 8 [2020-07-21 11:37:18,468 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1934366062] [2020-07-21 11:37:18,469 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-21 11:37:18,469 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:18,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-21 11:37:18,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2020-07-21 11:37:18,470 INFO L87 Difference]: Start difference. First operand 30 states and 33 transitions. Second operand 8 states. [2020-07-21 11:37:18,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:18,557 INFO L93 Difference]: Finished difference Result 57 states and 65 transitions. [2020-07-21 11:37:18,560 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 11:37:18,560 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 25 [2020-07-21 11:37:18,561 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:18,561 INFO L225 Difference]: With dead ends: 57 [2020-07-21 11:37:18,561 INFO L226 Difference]: Without dead ends: 36 [2020-07-21 11:37:18,562 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 42 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=41, Unknown=0, NotChecked=0, Total=72 [2020-07-21 11:37:18,563 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-21 11:37:18,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-21 11:37:18,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 11:37:18,576 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 39 transitions. [2020-07-21 11:37:18,579 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 39 transitions. Word has length 25 [2020-07-21 11:37:18,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:18,580 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 39 transitions. [2020-07-21 11:37:18,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-21 11:37:18,580 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 39 transitions. [2020-07-21 11:37:18,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-21 11:37:18,584 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:18,585 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:18,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:18,797 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:18,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:18,798 INFO L82 PathProgramCache]: Analyzing trace with hash 237942135, now seen corresponding path program 2 times [2020-07-21 11:37:18,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:18,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1066970862] [2020-07-21 11:37:18,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:18,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:18,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 11:37:18,857 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:18,948 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:18,948 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:19,105 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:19,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1066970862] [2020-07-21 11:37:19,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:19,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-07-21 11:37:19,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [737304063] [2020-07-21 11:37:19,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 11:37:19,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:19,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 11:37:19,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=81, Invalid=101, Unknown=0, NotChecked=0, Total=182 [2020-07-21 11:37:19,108 INFO L87 Difference]: Start difference. First operand 36 states and 39 transitions. Second operand 14 states. [2020-07-21 11:37:19,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:19,200 INFO L93 Difference]: Finished difference Result 69 states and 80 transitions. [2020-07-21 11:37:19,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 11:37:19,201 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 31 [2020-07-21 11:37:19,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:19,202 INFO L225 Difference]: With dead ends: 69 [2020-07-21 11:37:19,202 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 11:37:19,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 48 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=119, Unknown=0, NotChecked=0, Total=210 [2020-07-21 11:37:19,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 11:37:19,209 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-21 11:37:19,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-21 11:37:19,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2020-07-21 11:37:19,211 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 31 [2020-07-21 11:37:19,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:19,211 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2020-07-21 11:37:19,211 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 11:37:19,212 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2020-07-21 11:37:19,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-21 11:37:19,213 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:19,213 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:19,427 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:19,428 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:19,429 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:19,429 INFO L82 PathProgramCache]: Analyzing trace with hash -2007416981, now seen corresponding path program 3 times [2020-07-21 11:37:19,430 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:19,430 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1430806901] [2020-07-21 11:37:19,431 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:19,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:19,497 INFO L263 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 11:37:19,501 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:19,713 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:19,713 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:20,136 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:20,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1430806901] [2020-07-21 11:37:20,137 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:20,137 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 26 [2020-07-21 11:37:20,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351324133] [2020-07-21 11:37:20,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-21 11:37:20,140 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:20,140 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-21 11:37:20,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=347, Unknown=0, NotChecked=0, Total=650 [2020-07-21 11:37:20,141 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 26 states. [2020-07-21 11:37:20,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:20,337 INFO L93 Difference]: Finished difference Result 93 states and 110 transitions. [2020-07-21 11:37:20,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-21 11:37:20,338 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 43 [2020-07-21 11:37:20,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:20,340 INFO L225 Difference]: With dead ends: 93 [2020-07-21 11:37:20,340 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 11:37:20,341 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 60 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=319, Invalid=383, Unknown=0, NotChecked=0, Total=702 [2020-07-21 11:37:20,341 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 11:37:20,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-21 11:37:20,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-21 11:37:20,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2020-07-21 11:37:20,351 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 43 [2020-07-21 11:37:20,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:20,352 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2020-07-21 11:37:20,352 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-21 11:37:20,352 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2020-07-21 11:37:20,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-21 11:37:20,354 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:20,354 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:20,569 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:20,570 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:20,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:20,571 INFO L82 PathProgramCache]: Analyzing trace with hash 2051631443, now seen corresponding path program 4 times [2020-07-21 11:37:20,571 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:20,572 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1526216658] [2020-07-21 11:37:20,572 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 11:37:20,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:20,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 11:37:20,661 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:21,194 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:21,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:22,704 INFO L134 CoverageAnalysis]: Checked inductivity of 485 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:22,705 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1526216658] [2020-07-21 11:37:22,705 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:22,705 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 50 [2020-07-21 11:37:22,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2090392388] [2020-07-21 11:37:22,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-21 11:37:22,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:22,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-21 11:37:22,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1179, Invalid=1271, Unknown=0, NotChecked=0, Total=2450 [2020-07-21 11:37:22,709 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 50 states. [2020-07-21 11:37:23,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:23,096 INFO L93 Difference]: Finished difference Result 141 states and 170 transitions. [2020-07-21 11:37:23,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-07-21 11:37:23,096 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 67 [2020-07-21 11:37:23,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:23,098 INFO L225 Difference]: With dead ends: 141 [2020-07-21 11:37:23,098 INFO L226 Difference]: Without dead ends: 120 [2020-07-21 11:37:23,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1207, Invalid=1343, Unknown=0, NotChecked=0, Total=2550 [2020-07-21 11:37:23,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-07-21 11:37:23,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 120. [2020-07-21 11:37:23,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2020-07-21 11:37:23,113 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2020-07-21 11:37:23,113 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 67 [2020-07-21 11:37:23,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:23,113 INFO L479 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2020-07-21 11:37:23,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-07-21 11:37:23,114 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2020-07-21 11:37:23,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-21 11:37:23,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:23,116 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:23,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:23,331 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:23,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:23,332 INFO L82 PathProgramCache]: Analyzing trace with hash 346166563, now seen corresponding path program 5 times [2020-07-21 11:37:23,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:23,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1073943692] [2020-07-21 11:37:23,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:23,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:23,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 695 conjuncts, 50 conjunts are in the unsatisfiable core [2020-07-21 11:37:23,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:25,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:25,223 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:25,430 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 11:37:25,631 WARN L193 SmtUtils]: Spent 197.00 ms on a formula simplification that was a NOOP. DAG size: 148 [2020-07-21 11:37:30,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2117 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:30,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1073943692] [2020-07-21 11:37:30,808 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:37:30,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50] total 98 [2020-07-21 11:37:30,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [327623789] [2020-07-21 11:37:30,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 98 states [2020-07-21 11:37:30,809 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:37:30,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2020-07-21 11:37:30,815 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4659, Invalid=4847, Unknown=0, NotChecked=0, Total=9506 [2020-07-21 11:37:30,815 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 98 states. [2020-07-21 11:37:31,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:37:31,780 INFO L93 Difference]: Finished difference Result 237 states and 290 transitions. [2020-07-21 11:37:31,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2020-07-21 11:37:31,781 INFO L78 Accepts]: Start accepts. Automaton has 98 states. Word has length 115 [2020-07-21 11:37:31,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:37:31,784 INFO L225 Difference]: With dead ends: 237 [2020-07-21 11:37:31,784 INFO L226 Difference]: Without dead ends: 216 [2020-07-21 11:37:31,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 132 SyntacticMatches, 1 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 92 ImplicationChecksByTransitivity, 6.7s TimeCoverageRelationStatistics Valid=4711, Invalid=4991, Unknown=0, NotChecked=0, Total=9702 [2020-07-21 11:37:31,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 216 states. [2020-07-21 11:37:31,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 216 to 216. [2020-07-21 11:37:31,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 216 states. [2020-07-21 11:37:31,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 216 states to 216 states and 219 transitions. [2020-07-21 11:37:31,807 INFO L78 Accepts]: Start accepts. Automaton has 216 states and 219 transitions. Word has length 115 [2020-07-21 11:37:31,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:37:31,808 INFO L479 AbstractCegarLoop]: Abstraction has 216 states and 219 transitions. [2020-07-21 11:37:31,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 98 states. [2020-07-21 11:37:31,808 INFO L276 IsEmpty]: Start isEmpty. Operand 216 states and 219 transitions. [2020-07-21 11:37:31,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2020-07-21 11:37:31,811 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:37:31,811 INFO L422 BasicCegarLoop]: trace histogram [94, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:37:32,025 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:32,026 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:37:32,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:37:32,027 INFO L82 PathProgramCache]: Analyzing trace with hash -946549565, now seen corresponding path program 6 times [2020-07-21 11:37:32,027 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:37:32,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2096515004] [2020-07-21 11:37:32,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:37:32,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:37:32,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 1319 conjuncts, 98 conjunts are in the unsatisfiable core [2020-07-21 11:37:32,254 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:37:38,784 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:37:38,785 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:37:39,367 WARN L193 SmtUtils]: Spent 573.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 11:37:39,969 WARN L193 SmtUtils]: Spent 594.00 ms on a formula simplification that was a NOOP. DAG size: 292 [2020-07-21 11:38:02,496 INFO L134 CoverageAnalysis]: Checked inductivity of 8837 backedges. 0 proven. 8836 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:38:02,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2096515004] [2020-07-21 11:38:02,498 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:38:02,498 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98] total 194 [2020-07-21 11:38:02,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [44845927] [2020-07-21 11:38:02,502 INFO L459 AbstractCegarLoop]: Interpolant automaton has 194 states [2020-07-21 11:38:02,502 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:38:02,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2020-07-21 11:38:02,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18531, Invalid=18911, Unknown=0, NotChecked=0, Total=37442 [2020-07-21 11:38:02,527 INFO L87 Difference]: Start difference. First operand 216 states and 219 transitions. Second operand 194 states. [2020-07-21 11:38:08,333 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:38:08,333 INFO L93 Difference]: Finished difference Result 429 states and 530 transitions. [2020-07-21 11:38:08,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 194 states. [2020-07-21 11:38:08,335 INFO L78 Accepts]: Start accepts. Automaton has 194 states. Word has length 211 [2020-07-21 11:38:08,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:38:08,341 INFO L225 Difference]: With dead ends: 429 [2020-07-21 11:38:08,341 INFO L226 Difference]: Without dead ends: 408 [2020-07-21 11:38:08,347 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 422 GetRequests, 228 SyntacticMatches, 1 SemanticMatches, 193 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 188 ImplicationChecksByTransitivity, 28.6s TimeCoverageRelationStatistics Valid=18631, Invalid=19199, Unknown=0, NotChecked=0, Total=37830 [2020-07-21 11:38:08,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2020-07-21 11:38:08,375 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 408. [2020-07-21 11:38:08,375 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-21 11:38:08,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 411 transitions. [2020-07-21 11:38:08,379 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 411 transitions. Word has length 211 [2020-07-21 11:38:08,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:38:08,379 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 411 transitions. [2020-07-21 11:38:08,380 INFO L480 AbstractCegarLoop]: Interpolant automaton has 194 states. [2020-07-21 11:38:08,380 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 411 transitions. [2020-07-21 11:38:08,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 404 [2020-07-21 11:38:08,386 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:38:08,386 INFO L422 BasicCegarLoop]: trace histogram [190, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:38:08,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:38:08,602 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:38:08,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:38:08,602 INFO L82 PathProgramCache]: Analyzing trace with hash -1988117501, now seen corresponding path program 7 times [2020-07-21 11:38:08,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:38:08,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [89876462] [2020-07-21 11:38:08,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:38:09,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:38:09,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 2567 conjuncts, 194 conjunts are in the unsatisfiable core [2020-07-21 11:38:09,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:38:38,718 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:38:38,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:38:40,992 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-21 11:38:43,163 WARN L193 SmtUtils]: Spent 2.16 s on a formula simplification that was a NOOP. DAG size: 580 [2020-07-21 11:41:13,473 INFO L134 CoverageAnalysis]: Checked inductivity of 36101 backedges. 0 proven. 36100 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:41:13,474 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [89876462] [2020-07-21 11:41:13,474 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 11:41:13,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [194, 194] total 386 [2020-07-21 11:41:13,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415737797] [2020-07-21 11:41:13,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 386 states [2020-07-21 11:41:13,477 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 11:41:13,490 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 386 interpolants. [2020-07-21 11:41:13,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73923, Invalid=74687, Unknown=0, NotChecked=0, Total=148610 [2020-07-21 11:41:13,500 INFO L87 Difference]: Start difference. First operand 408 states and 411 transitions. Second operand 386 states. [2020-07-21 11:42:02,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 11:42:02,981 INFO L93 Difference]: Finished difference Result 813 states and 1010 transitions. [2020-07-21 11:42:02,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 386 states. [2020-07-21 11:42:02,984 INFO L78 Accepts]: Start accepts. Automaton has 386 states. Word has length 403 [2020-07-21 11:42:02,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 11:42:02,988 INFO L225 Difference]: With dead ends: 813 [2020-07-21 11:42:02,988 INFO L226 Difference]: Without dead ends: 792 [2020-07-21 11:42:02,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 806 GetRequests, 420 SyntacticMatches, 1 SemanticMatches, 385 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 380 ImplicationChecksByTransitivity, 179.4s TimeCoverageRelationStatistics Valid=74119, Invalid=75263, Unknown=0, NotChecked=0, Total=149382 [2020-07-21 11:42:02,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 792 states. [2020-07-21 11:42:03,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 792 to 792. [2020-07-21 11:42:03,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 792 states. [2020-07-21 11:42:03,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 792 states to 792 states and 795 transitions. [2020-07-21 11:42:03,034 INFO L78 Accepts]: Start accepts. Automaton has 792 states and 795 transitions. Word has length 403 [2020-07-21 11:42:03,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 11:42:03,035 INFO L479 AbstractCegarLoop]: Abstraction has 792 states and 795 transitions. [2020-07-21 11:42:03,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 386 states. [2020-07-21 11:42:03,035 INFO L276 IsEmpty]: Start isEmpty. Operand 792 states and 795 transitions. [2020-07-21 11:42:03,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 788 [2020-07-21 11:42:03,056 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 11:42:03,057 INFO L422 BasicCegarLoop]: trace histogram [382, 382, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 11:42:03,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:03,271 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 11:42:03,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 11:42:03,273 INFO L82 PathProgramCache]: Analyzing trace with hash -1788110205, now seen corresponding path program 8 times [2020-07-21 11:42:03,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 11:42:03,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572147669] [2020-07-21 11:42:03,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 11:42:04,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-21 11:42:04,169 INFO L263 TraceCheckSpWp]: Trace formula consists of 5063 conjuncts, 386 conjunts are in the unsatisfiable core [2020-07-21 11:42:04,190 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 11:47:17,796 INFO L134 CoverageAnalysis]: Checked inductivity of 145925 backedges. 0 proven. 145924 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 11:47:17,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 11:47:27,680 WARN L193 SmtUtils]: Spent 9.83 s on a formula simplification that was a NOOP. DAG size: 1156 [2020-07-21 11:47:38,056 WARN L193 SmtUtils]: Spent 10.34 s on a formula simplification that was a NOOP. DAG size: 1156 [2020-07-21 11:47:38,189 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 1158 DAG size of output: 1