/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/recursive-simple/id_o1000.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 11:15:30,715 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 11:15:30,718 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 11:15:30,740 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 11:15:30,741 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 11:15:30,742 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 11:15:30,744 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 11:15:30,745 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 11:15:30,747 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 11:15:30,748 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 11:15:30,749 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 11:15:30,751 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 11:15:30,751 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 11:15:30,752 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 11:15:30,753 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 11:15:30,755 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 11:15:30,756 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 11:15:30,757 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 11:15:30,759 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 11:15:30,761 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 11:15:30,762 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 11:15:30,764 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 11:15:30,765 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 11:15:30,766 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 11:15:30,769 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 11:15:30,777 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 11:15:30,778 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 11:15:30,779 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 11:15:30,780 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 [2020-07-20 11:15:30,795 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 11:15:30,795 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 11:15:30,797 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 11:15:30,797 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 11:15:30,797 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 11:15:30,797 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 11:15:30,797 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 11:15:30,798 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 11:15:30,798 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 11:15:30,798 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 11:15:30,798 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 11:15:30,798 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 11:15:30,799 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 11:15:30,799 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 11:15:30,799 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 11:15:30,801 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 11:15:30,801 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 11:15:30,801 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 11:15:30,802 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 11:15:30,802 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 11:15:30,802 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 11:15:30,803 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 11:15:30,803 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 11:15:30,803 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 11:15:30,803 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 11:15:30,803 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 11:15:30,804 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:30,804 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 11:15:30,804 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 11:15:30,804 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 [2020-07-20 11:15:31,116 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 11:15:31,130 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 11:15:31,135 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 11:15:31,136 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 11:15:31,137 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 11:15:31,138 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-20 11:15:31,202 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69c3f0e22/8aab4ca3aad74ce685c2ac0aa8d3e368/FLAG675203274 [2020-07-20 11:15:31,690 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 11:15:31,691 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_o1000.c [2020-07-20 11:15:31,698 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69c3f0e22/8aab4ca3aad74ce685c2ac0aa8d3e368/FLAG675203274 [2020-07-20 11:15:32,047 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/69c3f0e22/8aab4ca3aad74ce685c2ac0aa8d3e368 [2020-07-20 11:15:32,059 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 11:15:32,062 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 11:15:32,068 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:32,069 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 11:15:32,073 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 11:15:32,074 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,078 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2723a77c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32, skipping insertion in model container [2020-07-20 11:15:32,078 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,088 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 11:15:32,108 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 11:15:32,264 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:32,269 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 11:15:32,285 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 11:15:32,301 INFO L208 MainTranslator]: Completed translation [2020-07-20 11:15:32,301 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32 WrapperNode [2020-07-20 11:15:32,302 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 11:15:32,303 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 11:15:32,303 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 11:15:32,303 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 11:15:32,318 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,318 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,324 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,325 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,328 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,331 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,332 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (1/1) ... [2020-07-20 11:15:32,333 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 11:15:32,334 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 11:15:32,334 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 11:15:32,334 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 11:15:32,335 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (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 [2020-07-20 11:15:32,500 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 11:15:32,500 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 11:15:32,500 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-20 11:15:32,501 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 11:15:32,501 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_uint [2020-07-20 11:15:32,501 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 11:15:32,501 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-20 11:15:32,501 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 11:15:32,501 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 11:15:32,502 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 11:15:32,658 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 11:15:32,658 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 11:15:32,662 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:32 BoogieIcfgContainer [2020-07-20 11:15:32,662 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 11:15:32,663 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 11:15:32,664 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 11:15:32,667 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 11:15:32,667 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 11:15:32" (1/3) ... [2020-07-20 11:15:32,668 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a3a5db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:32, skipping insertion in model container [2020-07-20 11:15:32,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 11:15:32" (2/3) ... [2020-07-20 11:15:32,669 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@68a3a5db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 11:15:32, skipping insertion in model container [2020-07-20 11:15:32,669 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 11:15:32" (3/3) ... [2020-07-20 11:15:32,671 INFO L109 eAbstractionObserver]: Analyzing ICFG id_o1000.c [2020-07-20 11:15:32,682 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 11:15:32,689 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 11:15:32,705 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 11:15:32,732 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 11:15:32,732 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 11:15:32,733 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 11:15:32,733 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 11:15:32,734 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 11:15:32,734 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 11:15:32,734 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 11:15:32,734 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 11:15:32,759 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-20 11:15:32,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 11:15:32,768 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:32,769 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:32,769 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:32,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:32,774 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-20 11:15:32,781 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:32,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753912209] [2020-07-20 11:15:32,782 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 [2020-07-20 11:15:32,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:32,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 11:15:32,854 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:32,954 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 11:15:32,964 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 11:15:32,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753912209] [2020-07-20 11:15:32,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 11:15:32,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 11:15:32,968 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519446385] [2020-07-20 11:15:32,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 11:15:32,977 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:32,990 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 11:15:32,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:15:32,993 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-20 11:15:33,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:33,043 INFO L93 Difference]: Finished difference Result 32 states and 35 transitions. [2020-07-20 11:15:33,044 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 11:15:33,046 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 11:15:33,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:33,060 INFO L225 Difference]: With dead ends: 32 [2020-07-20 11:15:33,061 INFO L226 Difference]: Without dead ends: 18 [2020-07-20 11:15:33,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 11:15:33,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-20 11:15:33,120 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-20 11:15:33,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-20 11:15:33,124 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-20 11:15:33,126 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-20 11:15:33,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:33,128 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-20 11:15:33,128 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 11:15:33,128 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-20 11:15:33,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-20 11:15:33,135 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:33,136 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:33,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:33,351 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:33,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:33,352 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-20 11:15:33,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:33,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [497986468] [2020-07-20 11:15:33,354 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 [2020-07-20 11:15:33,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:33,390 INFO L263 TraceCheckSpWp]: Trace formula consists of 42 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 11:15:33,392 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:33,461 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:33,462 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:33,654 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-20 11:15:33,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [497986468] [2020-07-20 11:15:33,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:33,656 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-20 11:15:33,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1451135862] [2020-07-20 11:15:33,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-20 11:15:33,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:33,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-20 11:15:33,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:15:33,660 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 12 states. [2020-07-20 11:15:35,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:35,818 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2020-07-20 11:15:35,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 11:15:35,819 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 19 [2020-07-20 11:15:35,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:35,821 INFO L225 Difference]: With dead ends: 30 [2020-07-20 11:15:35,821 INFO L226 Difference]: Without dead ends: 24 [2020-07-20 11:15:35,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=104, Unknown=0, NotChecked=0, Total=132 [2020-07-20 11:15:35,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-20 11:15:35,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-20 11:15:35,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-20 11:15:35,836 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-20 11:15:35,837 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2020-07-20 11:15:35,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:35,837 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-20 11:15:35,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-20 11:15:35,837 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-20 11:15:35,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-20 11:15:35,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:35,841 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:36,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:36,057 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:36,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:36,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 2 times [2020-07-20 11:15:36,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:36,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1447367410] [2020-07-20 11:15:36,058 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 [2020-07-20 11:15:36,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:36,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 11:15:36,100 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:36,201 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:36,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:36,735 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-20 11:15:36,736 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1447367410] [2020-07-20 11:15:36,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:36,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 20 [2020-07-20 11:15:36,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2026884319] [2020-07-20 11:15:36,738 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-20 11:15:36,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:36,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-20 11:15:36,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=316, Unknown=0, NotChecked=0, Total=380 [2020-07-20 11:15:36,739 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 20 states. [2020-07-20 11:15:41,029 WARN L193 SmtUtils]: Spent 4.17 s on a formula simplification that was a NOOP. DAG size: 18 [2020-07-20 11:15:41,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:15:41,281 INFO L93 Difference]: Finished difference Result 42 states and 46 transitions. [2020-07-20 11:15:41,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 11:15:41,282 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 31 [2020-07-20 11:15:41,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:15:41,284 INFO L225 Difference]: With dead ends: 42 [2020-07-20 11:15:41,284 INFO L226 Difference]: Without dead ends: 36 [2020-07-20 11:15:41,286 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=98, Invalid=454, Unknown=0, NotChecked=0, Total=552 [2020-07-20 11:15:41,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-20 11:15:41,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-20 11:15:41,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 11:15:41,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-20 11:15:41,300 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 31 [2020-07-20 11:15:41,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:15:41,300 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-20 11:15:41,300 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-20 11:15:41,300 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-20 11:15:41,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-20 11:15:41,303 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:15:41,304 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:15:41,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:15:41,506 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:15:41,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:15:41,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 3 times [2020-07-20 11:15:41,508 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:15:41,508 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [307753338] [2020-07-20 11:15:41,509 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 [2020-07-20 11:15:41,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:15:41,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 35 conjunts are in the unsatisfiable core [2020-07-20 11:15:41,560 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:15:41,833 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:41,833 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:15:53,773 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 74 refuted. 3 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-20 11:15:53,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [307753338] [2020-07-20 11:15:53,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:15:53,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 36 [2020-07-20 11:15:53,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [889919599] [2020-07-20 11:15:53,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 11:15:53,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:15:53,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 11:15:53,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=1071, Unknown=5, NotChecked=0, Total=1260 [2020-07-20 11:15:53,777 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 36 states. [2020-07-20 11:15:54,492 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 11:15:59,066 WARN L193 SmtUtils]: Spent 4.21 s on a formula simplification. DAG size of input: 36 DAG size of output: 11 [2020-07-20 11:16:06,510 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 26 DAG size of output: 11 [2020-07-20 11:16:11,290 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 11:16:13,906 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:16:13,906 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2020-07-20 11:16:13,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 11:16:13,909 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 55 [2020-07-20 11:16:13,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:16:13,912 INFO L225 Difference]: With dead ends: 66 [2020-07-20 11:16:13,912 INFO L226 Difference]: Without dead ends: 60 [2020-07-20 11:16:13,914 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 75 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 31.2s TimeCoverageRelationStatistics Valid=379, Invalid=1869, Unknown=8, NotChecked=0, Total=2256 [2020-07-20 11:16:13,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-20 11:16:13,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-20 11:16:13,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-20 11:16:13,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-20 11:16:13,926 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 55 [2020-07-20 11:16:13,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:16:13,927 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-20 11:16:13,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 11:16:13,927 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-20 11:16:13,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-20 11:16:13,930 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:16:13,931 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:16:14,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:16:14,146 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:16:14,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:16:14,148 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 4 times [2020-07-20 11:16:14,148 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:16:14,149 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [465771759] [2020-07-20 11:16:14,149 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 [2020-07-20 11:16:14,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:16:14,226 INFO L263 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 67 conjunts are in the unsatisfiable core [2020-07-20 11:16:14,232 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:16:14,957 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:14,957 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:16:37,160 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 336 refuted. 9 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-20 11:16:37,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [465771759] [2020-07-20 11:16:37,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:16:37,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35] total 68 [2020-07-20 11:16:37,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821662107] [2020-07-20 11:16:37,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 68 states [2020-07-20 11:16:37,167 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:16:37,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2020-07-20 11:16:37,170 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=3932, Unknown=8, NotChecked=0, Total=4556 [2020-07-20 11:16:37,170 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 68 states. [2020-07-20 11:16:45,614 WARN L193 SmtUtils]: Spent 1.66 s on a formula simplification. DAG size of input: 78 DAG size of output: 13 [2020-07-20 11:16:49,893 WARN L193 SmtUtils]: Spent 428.00 ms on a formula simplification. DAG size of input: 76 DAG size of output: 11 [2020-07-20 11:16:57,830 WARN L193 SmtUtils]: Spent 2.43 s on a formula simplification. DAG size of input: 73 DAG size of output: 13 [2020-07-20 11:17:05,475 WARN L193 SmtUtils]: Spent 719.00 ms on a formula simplification. DAG size of input: 71 DAG size of output: 11 [2020-07-20 11:17:13,226 WARN L193 SmtUtils]: Spent 4.67 s on a formula simplification. DAG size of input: 68 DAG size of output: 13 [2020-07-20 11:17:18,889 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 66 DAG size of output: 11 [2020-07-20 11:17:21,744 WARN L193 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 63 DAG size of output: 13 [2020-07-20 11:17:27,755 WARN L193 SmtUtils]: Spent 301.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 11 [2020-07-20 11:17:37,376 WARN L193 SmtUtils]: Spent 2.36 s on a formula simplification. DAG size of input: 58 DAG size of output: 13 [2020-07-20 11:17:41,738 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 56 DAG size of output: 11 [2020-07-20 11:17:46,330 WARN L193 SmtUtils]: Spent 2.32 s on a formula simplification. DAG size of input: 53 DAG size of output: 13 [2020-07-20 11:17:51,045 WARN L193 SmtUtils]: Spent 287.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 11 [2020-07-20 11:18:03,916 WARN L193 SmtUtils]: Spent 2.31 s on a formula simplification. DAG size of input: 48 DAG size of output: 13 [2020-07-20 11:18:14,262 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 46 DAG size of output: 11 [2020-07-20 11:18:22,482 WARN L193 SmtUtils]: Spent 2.34 s on a formula simplification. DAG size of input: 43 DAG size of output: 13 [2020-07-20 11:18:32,143 WARN L193 SmtUtils]: Spent 2.97 s on a formula simplification. DAG size of input: 41 DAG size of output: 11 [2020-07-20 11:18:42,571 WARN L193 SmtUtils]: Spent 2.18 s on a formula simplification. DAG size of input: 38 DAG size of output: 13 [2020-07-20 11:18:54,359 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 13 [2020-07-20 11:19:00,621 WARN L193 SmtUtils]: Spent 2.13 s on a formula simplification. DAG size of input: 28 DAG size of output: 13 [2020-07-20 11:19:11,298 WARN L193 SmtUtils]: Spent 2.35 s on a formula simplification. DAG size of input: 23 DAG size of output: 13 [2020-07-20 11:19:16,120 WARN L193 SmtUtils]: Spent 2.15 s on a formula simplification. DAG size of input: 21 DAG size of output: 11 [2020-07-20 11:19:29,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 11:19:29,998 INFO L93 Difference]: Finished difference Result 114 states and 130 transitions. [2020-07-20 11:19:29,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2020-07-20 11:19:29,999 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 103 [2020-07-20 11:19:30,001 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 11:19:30,003 INFO L225 Difference]: With dead ends: 114 [2020-07-20 11:19:30,004 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 11:19:30,007 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 695 ImplicationChecksByTransitivity, 188.2s TimeCoverageRelationStatistics Valid=1523, Invalid=7575, Unknown=22, NotChecked=0, Total=9120 [2020-07-20 11:19:30,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 11:19:30,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2020-07-20 11:19:30,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-07-20 11:19:30,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 109 transitions. [2020-07-20 11:19:30,022 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 109 transitions. Word has length 103 [2020-07-20 11:19:30,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 11:19:30,023 INFO L479 AbstractCegarLoop]: Abstraction has 108 states and 109 transitions. [2020-07-20 11:19:30,023 INFO L480 AbstractCegarLoop]: Interpolant automaton has 68 states. [2020-07-20 11:19:30,023 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 109 transitions. [2020-07-20 11:19:30,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2020-07-20 11:19:30,028 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 11:19:30,028 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 31, 31, 31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 11:19:30,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 11:19:30,234 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 11:19:30,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 11:19:30,234 INFO L82 PathProgramCache]: Analyzing trace with hash -935230737, now seen corresponding path program 5 times [2020-07-20 11:19:30,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 11:19:30,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1800619345] [2020-07-20 11:19:30,237 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 [2020-07-20 11:19:30,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-20 11:19:30,329 INFO L263 TraceCheckSpWp]: Trace formula consists of 402 conjuncts, 131 conjunts are in the unsatisfiable core [2020-07-20 11:19:30,363 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 11:19:34,171 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1457 refuted. 0 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 11:19:34,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 11:21:36,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2914 backedges. 0 proven. 1404 refuted. 53 times theorem prover too weak. 1457 trivial. 0 not checked. [2020-07-20 11:21:36,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1800619345] [2020-07-20 11:21:36,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 11:21:36,434 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67] total 132 [2020-07-20 11:21:36,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1627748204] [2020-07-20 11:21:36,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 132 states [2020-07-20 11:21:36,437 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 11:21:36,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2020-07-20 11:21:36,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2248, Invalid=15001, Unknown=43, NotChecked=0, Total=17292 [2020-07-20 11:21:36,446 INFO L87 Difference]: Start difference. First operand 108 states and 109 transitions. Second operand 132 states. [2020-07-20 11:22:39,475 WARN L193 SmtUtils]: Spent 6.06 s on a formula simplification. DAG size of input: 158 DAG size of output: 13 [2020-07-20 11:23:42,615 WARN L193 SmtUtils]: Spent 9.42 s on a formula simplification. DAG size of input: 156 DAG size of output: 11 [2020-07-20 11:24:42,249 WARN L193 SmtUtils]: Spent 10.23 s on a formula simplification. DAG size of input: 153 DAG size of output: 13 [2020-07-20 11:25:34,182 WARN L193 SmtUtils]: Spent 9.71 s on a formula simplification. DAG size of input: 151 DAG size of output: 11 [2020-07-20 11:26:15,249 WARN L193 SmtUtils]: Spent 3.85 s on a formula simplification. DAG size of input: 148 DAG size of output: 13 [2020-07-20 11:27:12,969 WARN L193 SmtUtils]: Spent 6.90 s on a formula simplification. DAG size of input: 146 DAG size of output: 11 [2020-07-20 11:27:57,523 WARN L193 SmtUtils]: Spent 3.08 s on a formula simplification. DAG size of input: 143 DAG size of output: 13 [2020-07-20 11:28:41,858 WARN L193 SmtUtils]: Spent 7.50 s on a formula simplification. DAG size of input: 141 DAG size of output: 11 [2020-07-20 11:29:30,043 WARN L193 SmtUtils]: Spent 5.25 s on a formula simplification. DAG size of input: 138 DAG size of output: 13