java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:04:33,155 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:04:33,157 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:04:33,172 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:04:33,172 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:04:33,174 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:04:33,175 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:04:33,176 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:04:33,178 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:04:33,179 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:04:33,180 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:04:33,181 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:04:33,182 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:04:33,183 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:04:33,184 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:04:33,186 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:04:33,189 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:04:33,191 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:04:33,192 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:04:33,194 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:04:33,196 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:04:33,197 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:04:33,197 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:04:33,198 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:04:33,199 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:04:33,201 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:04:33,201 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:04:33,202 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:04:33,202 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:04:33,202 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:04:33,203 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:04:33,203 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf [2018-01-21 06:04:33,212 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:04:33,212 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:04:33,213 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:04:33,213 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:04:33,213 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:04:33,213 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:04:33,213 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:04:33,213 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:04:33,214 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:04:33,214 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:04:33,214 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:04:33,214 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:04:33,214 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:04:33,215 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:04:33,216 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:04:33,216 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:04:33,216 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:04:33,216 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:04:33,216 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:04:33,217 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:04:33,217 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:04:33,218 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:04:33,218 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:04:33,218 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:04:33,218 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:04:33,251 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:04:33,262 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:04:33,265 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:04:33,266 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:04:33,266 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:04:33,267 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength2_true-valid-memsafety.c [2018-01-21 06:04:33,387 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:04:33,391 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:04:33,392 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:04:33,392 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:04:33,397 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:04:33,398 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1fa4218e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33, skipping insertion in model container [2018-01-21 06:04:33,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,414 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:04:33,428 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:04:33,543 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:04:33,563 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:04:33,570 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33 WrapperNode [2018-01-21 06:04:33,571 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:04:33,571 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:04:33,571 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:04:33,572 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:04:33,583 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,583 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,591 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,591 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,595 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,599 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,600 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... [2018-01-21 06:04:33,602 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:04:33,603 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:04:33,603 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:04:33,603 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:04:33,604 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (1/1) ... No working directory specified, using /storage/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 [2018-01-21 06:04:33,658 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:04:33,658 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:04:33,658 INFO L136 BoogieDeclarations]: Found implementation of procedure bar [2018-01-21 06:04:33,658 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:04:33,658 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:04:33,658 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure bar [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:04:33,659 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:04:33,851 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:04:33,856 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:04:33 BoogieIcfgContainer [2018-01-21 06:04:33,856 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:04:33,857 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:04:33,857 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:04:33,859 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:04:33,860 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:04:33" (1/3) ... [2018-01-21 06:04:33,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28265479 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:04:33, skipping insertion in model container [2018-01-21 06:04:33,861 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:04:33" (2/3) ... [2018-01-21 06:04:33,861 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28265479 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:04:33, skipping insertion in model container [2018-01-21 06:04:33,862 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:04:33" (3/3) ... [2018-01-21 06:04:33,864 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength2_true-valid-memsafety.c [2018-01-21 06:04:33,872 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:04:33,880 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 5 error locations. [2018-01-21 06:04:33,919 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:04:33,919 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:04:33,919 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:04:33,919 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:04:33,919 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:04:33,920 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:04:33,920 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:04:33,920 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == barErr0EnsuresViolation======== [2018-01-21 06:04:33,920 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:04:33,938 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 06:04:33,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 06:04:33,945 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:33,946 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:04:33,946 INFO L371 AbstractCegarLoop]: === Iteration 1 === [barErr0EnsuresViolation]=== [2018-01-21 06:04:33,950 INFO L82 PathProgramCache]: Analyzing trace with hash -492377012, now seen corresponding path program 1 times [2018-01-21 06:04:33,952 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:33,992 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:33,992 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:33,992 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:33,993 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,052 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,094 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,096 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:04:34,097 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:04:34,097 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:34,100 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:04:34,114 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:04:34,114 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,116 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 06:04:34,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:34,143 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 06:04:34,143 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:04:34,144 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 20 [2018-01-21 06:04:34,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:34,150 INFO L225 Difference]: With dead ends: 114 [2018-01-21 06:04:34,150 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:04:34,155 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:04:34,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:04:34,177 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:04:34,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:04:34,178 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 20 [2018-01-21 06:04:34,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:34,179 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:04:34,179 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:04:34,179 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:04:34,179 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:04:34,183 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-01-21 06:04:34,290 INFO L404 ceAbstractionStarter]: At program point L13'''(lines 13 15) the Hoare annotation is: true [2018-01-21 06:04:34,290 INFO L401 ceAbstractionStarter]: For program point barErr0EnsuresViolation(lines 11 17) no Hoare annotation was computed. [2018-01-21 06:04:34,290 INFO L401 ceAbstractionStarter]: For program point L13''(lines 13 15) no Hoare annotation was computed. [2018-01-21 06:04:34,290 INFO L401 ceAbstractionStarter]: For program point L14(line 14) no Hoare annotation was computed. [2018-01-21 06:04:34,291 INFO L401 ceAbstractionStarter]: For program point L13(lines 13 15) no Hoare annotation was computed. [2018-01-21 06:04:34,291 INFO L404 ceAbstractionStarter]: At program point barENTRY(lines 11 17) the Hoare annotation is: true [2018-01-21 06:04:34,291 INFO L401 ceAbstractionStarter]: For program point L13''''(lines 13 15) no Hoare annotation was computed. [2018-01-21 06:04:34,291 INFO L401 ceAbstractionStarter]: For program point barFINAL(lines 11 17) no Hoare annotation was computed. [2018-01-21 06:04:34,291 INFO L401 ceAbstractionStarter]: For program point L14'(line 14) no Hoare annotation was computed. [2018-01-21 06:04:34,291 INFO L401 ceAbstractionStarter]: For program point barEXIT(lines 11 17) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.initENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.initFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point fooEXIT(lines 20 29) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point L21(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-01-21 06:04:34,292 INFO L401 ceAbstractionStarter]: For program point L22(lines 22 24) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L25(line 25) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L23'(line 23) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L21'''''(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L25'(lines 25 27) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L21'''(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L21'(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point fooFINAL(lines 20 29) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L404 ceAbstractionStarter]: At program point fooENTRY(lines 20 29) the Hoare annotation is: true [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L22''(lines 22 24) no Hoare annotation was computed. [2018-01-21 06:04:34,293 INFO L401 ceAbstractionStarter]: For program point L23''(line 23) no Hoare annotation was computed. [2018-01-21 06:04:34,294 INFO L401 ceAbstractionStarter]: For program point L21''(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,294 INFO L404 ceAbstractionStarter]: At program point L22''''(lines 22 24) the Hoare annotation is: true [2018-01-21 06:04:34,294 INFO L404 ceAbstractionStarter]: At program point L22'''(lines 22 24) the Hoare annotation is: true [2018-01-21 06:04:34,294 INFO L401 ceAbstractionStarter]: For program point fooErr0EnsuresViolation(lines 20 29) no Hoare annotation was computed. [2018-01-21 06:04:34,294 INFO L401 ceAbstractionStarter]: For program point L21''''(line 21) no Hoare annotation was computed. [2018-01-21 06:04:34,294 INFO L404 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(lines 1 43) the Hoare annotation is: true [2018-01-21 06:04:34,294 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,294 INFO L404 ceAbstractionStarter]: At program point L1(lines 1 43) the Hoare annotation is: true [2018-01-21 06:04:34,294 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startErr0EnsuresViolation(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,295 INFO L401 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(lines 1 43) no Hoare annotation was computed. [2018-01-21 06:04:34,295 INFO L404 ceAbstractionStarter]: At program point L36''(lines 36 40) the Hoare annotation is: true [2018-01-21 06:04:34,295 INFO L401 ceAbstractionStarter]: For program point L33''(lines 33 35) no Hoare annotation was computed. [2018-01-21 06:04:34,295 INFO L401 ceAbstractionStarter]: For program point L34''(line 34) no Hoare annotation was computed. [2018-01-21 06:04:34,295 INFO L404 ceAbstractionStarter]: At program point L33'''(lines 33 35) the Hoare annotation is: true [2018-01-21 06:04:34,295 INFO L401 ceAbstractionStarter]: For program point L32''(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L37'(line 37) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L32''''(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L32'''''(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point mainErr0EnsuresViolation(lines 31 42) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L36'''(lines 36 40) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point mainFINAL(lines 31 42) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L32(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L401 ceAbstractionStarter]: For program point L32'''(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,296 INFO L404 ceAbstractionStarter]: At program point L34(line 34) the Hoare annotation is: true [2018-01-21 06:04:34,297 INFO L401 ceAbstractionStarter]: For program point L33(lines 33 35) no Hoare annotation was computed. [2018-01-21 06:04:34,297 INFO L401 ceAbstractionStarter]: For program point L34'''(line 34) no Hoare annotation was computed. [2018-01-21 06:04:34,297 INFO L401 ceAbstractionStarter]: For program point L33''''(lines 33 35) no Hoare annotation was computed. [2018-01-21 06:04:34,297 INFO L401 ceAbstractionStarter]: For program point L36(lines 36 40) no Hoare annotation was computed. [2018-01-21 06:04:34,297 INFO L401 ceAbstractionStarter]: For program point mainEXIT(lines 31 42) no Hoare annotation was computed. [2018-01-21 06:04:34,297 INFO L404 ceAbstractionStarter]: At program point mainENTRY(lines 31 42) the Hoare annotation is: true [2018-01-21 06:04:34,298 INFO L401 ceAbstractionStarter]: For program point L38(line 38) no Hoare annotation was computed. [2018-01-21 06:04:34,298 INFO L401 ceAbstractionStarter]: For program point L37(line 37) no Hoare annotation was computed. [2018-01-21 06:04:34,298 INFO L401 ceAbstractionStarter]: For program point L34'(line 34) no Hoare annotation was computed. [2018-01-21 06:04:34,298 INFO L401 ceAbstractionStarter]: For program point L32'(line 32) no Hoare annotation was computed. [2018-01-21 06:04:34,301 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:04:34,302 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:04:34,302 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:04:34,302 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:04:34,302 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:04:34,302 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:04:34,302 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:04:34,303 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:04:34,303 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:04:34,305 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 06:04:34,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:04:34,306 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,306 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:04:34,306 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:04:34,306 INFO L82 PathProgramCache]: Analyzing trace with hash 136143, now seen corresponding path program 1 times [2018-01-21 06:04:34,306 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,308 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,308 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,308 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:04:34,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:04:34,335 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:04:34,339 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:04:34,344 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:04:34,344 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:04:34,344 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:04:34,344 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:04:34,345 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:04:34,345 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:04:34,345 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:04:34,345 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:04:34,345 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:04:34,347 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 06:04:34,349 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 06:04:34,349 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,350 INFO L322 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, 1] [2018-01-21 06:04:34,350 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:04:34,350 INFO L82 PathProgramCache]: Analyzing trace with hash 1220349549, now seen corresponding path program 1 times [2018-01-21 06:04:34,350 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,351 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,351 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,352 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,352 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,368 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,390 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,390 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:04:34,390 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:04:34,391 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:34,391 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:04:34,391 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:04:34,391 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,392 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 06:04:34,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:34,400 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 06:04:34,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:04:34,401 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 26 [2018-01-21 06:04:34,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:34,403 INFO L225 Difference]: With dead ends: 114 [2018-01-21 06:04:34,403 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 06:04:34,404 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 06:04:34,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 06:04:34,414 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:04:34,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 06:04:34,416 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 26 [2018-01-21 06:04:34,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:34,416 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 06:04:34,416 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:04:34,416 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 06:04:34,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 06:04:34,418 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,418 INFO L322 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, 1, 1, 1] [2018-01-21 06:04:34,418 INFO L371 AbstractCegarLoop]: === Iteration 2 === [fooErr0EnsuresViolation]=== [2018-01-21 06:04:34,418 INFO L82 PathProgramCache]: Analyzing trace with hash 390316661, now seen corresponding path program 1 times [2018-01-21 06:04:34,418 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,419 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,420 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,420 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,449 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,548 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:04:34,548 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:04:34,548 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:34,549 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 06:04:34,550 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 06:04:34,550 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 06:04:34,550 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 4 states. [2018-01-21 06:04:34,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:34,729 INFO L93 Difference]: Finished difference Result 43 states and 46 transitions. [2018-01-21 06:04:34,730 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:04:34,730 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 28 [2018-01-21 06:04:34,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:34,731 INFO L225 Difference]: With dead ends: 43 [2018-01-21 06:04:34,731 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:04:34,732 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:04:34,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:04:34,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:04:34,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:04:34,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:04:34,733 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 28 [2018-01-21 06:04:34,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:34,733 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:04:34,733 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 06:04:34,734 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:04:34,734 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:04:34,736 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:04:34,736 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:04:34,736 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:04:34,736 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:04:34,736 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:04:34,736 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:04:34,736 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:04:34,737 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:04:34,737 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:04:34,738 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states. [2018-01-21 06:04:34,740 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:04:34,740 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,740 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:04:34,740 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:04:34,740 INFO L82 PathProgramCache]: Analyzing trace with hash -851979775, now seen corresponding path program 1 times [2018-01-21 06:04:34,740 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,741 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,742 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,742 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,742 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,748 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,756 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,757 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:04:34,757 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:04:34,757 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:34,757 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:04:34,757 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:04:34,758 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,758 INFO L87 Difference]: Start difference. First operand 62 states. Second operand 2 states. [2018-01-21 06:04:34,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:34,765 INFO L93 Difference]: Finished difference Result 114 states and 135 transitions. [2018-01-21 06:04:34,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:04:34,765 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:04:34,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:34,767 INFO L225 Difference]: With dead ends: 114 [2018-01-21 06:04:34,767 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 06:04:34,768 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:04:34,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 06:04:34,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-01-21 06:04:34,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 06:04:34,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 06:04:34,775 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 17 [2018-01-21 06:04:34,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:34,775 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 06:04:34,775 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:04:34,775 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 06:04:34,776 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:04:34,776 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,776 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:04:34,776 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:04:34,777 INFO L82 PathProgramCache]: Analyzing trace with hash -178858898, now seen corresponding path program 1 times [2018-01-21 06:04:34,777 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,778 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,778 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,778 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,778 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,785 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,805 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:04:34,805 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:04:34,805 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:34,805 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:04:34,805 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:04:34,805 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:04:34,806 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 3 states. [2018-01-21 06:04:34,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:34,828 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2018-01-21 06:04:34,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:04:34,829 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:04:34,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:34,830 INFO L225 Difference]: With dead ends: 76 [2018-01-21 06:04:34,831 INFO L226 Difference]: Without dead ends: 61 [2018-01-21 06:04:34,831 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:04:34,831 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-01-21 06:04:34,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 56. [2018-01-21 06:04:34,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 06:04:34,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 60 transitions. [2018-01-21 06:04:34,840 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 60 transitions. Word has length 19 [2018-01-21 06:04:34,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:34,840 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 60 transitions. [2018-01-21 06:04:34,840 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:04:34,840 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 60 transitions. [2018-01-21 06:04:34,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 06:04:34,841 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:34,841 INFO L322 BasicCegarLoop]: trace histogram [2, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:04:34,841 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:04:34,842 INFO L82 PathProgramCache]: Analyzing trace with hash -853032378, now seen corresponding path program 1 times [2018-01-21 06:04:34,842 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:34,842 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,842 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:34,843 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:34,843 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:34,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:34,857 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:34,902 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:34,903 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:34,903 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:04:34,904 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 47 with the following transitions: [2018-01-21 06:04:34,906 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 06:04:34,960 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:04:34,960 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:04:38,701 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:04:38,703 INFO L268 AbstractInterpreter]: Visited 45 different actions 81 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 23 variables. [2018-01-21 06:04:38,723 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:04:38,723 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:38,723 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:04:38,736 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:38,736 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:04:38,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:38,774 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:04:38,822 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:38,822 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:04:38,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:38,913 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:38,913 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:04:38,916 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:38,917 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:04:38,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:38,958 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:04:38,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:38,965 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:04:38,988 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:04:38,989 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:04:38,990 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 06:04:38,990 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:04:38,990 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:04:38,990 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:04:38,991 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:04:38,991 INFO L87 Difference]: Start difference. First operand 56 states and 60 transitions. Second operand 5 states. [2018-01-21 06:04:39,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:39,033 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 06:04:39,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:04:39,033 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 46 [2018-01-21 06:04:39,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:39,035 INFO L225 Difference]: With dead ends: 80 [2018-01-21 06:04:39,035 INFO L226 Difference]: Without dead ends: 68 [2018-01-21 06:04:39,036 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 186 GetRequests, 181 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:04:39,036 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2018-01-21 06:04:39,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 63. [2018-01-21 06:04:39,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-01-21 06:04:39,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 68 transitions. [2018-01-21 06:04:39,043 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 68 transitions. Word has length 46 [2018-01-21 06:04:39,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:39,044 INFO L432 AbstractCegarLoop]: Abstraction has 63 states and 68 transitions. [2018-01-21 06:04:39,044 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:04:39,044 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 68 transitions. [2018-01-21 06:04:39,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-01-21 06:04:39,047 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:39,047 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:04:39,047 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:04:39,048 INFO L82 PathProgramCache]: Analyzing trace with hash -723838693, now seen corresponding path program 2 times [2018-01-21 06:04:39,048 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:39,049 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:39,049 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:04:39,049 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:39,049 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:39,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:39,074 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:39,149 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2018-01-21 06:04:39,149 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:39,150 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:04:39,150 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:04:39,150 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:04:39,150 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:39,150 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:04:39,167 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:04:39,167 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:04:39,183 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:04:39,209 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:04:39,222 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:04:39,226 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:04:39,428 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-01-21 06:04:39,428 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:04:39,633 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 22 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-01-21 06:04:39,653 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:04:39,653 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [5] total 12 [2018-01-21 06:04:39,653 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:04:39,654 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 06:04:39,654 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 06:04:39,654 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:04:39,654 INFO L87 Difference]: Start difference. First operand 63 states and 68 transitions. Second operand 7 states. [2018-01-21 06:04:39,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:04:39,768 INFO L93 Difference]: Finished difference Result 124 states and 137 transitions. [2018-01-21 06:04:39,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 06:04:39,769 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 71 [2018-01-21 06:04:39,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:04:39,772 INFO L225 Difference]: With dead ends: 124 [2018-01-21 06:04:39,772 INFO L226 Difference]: Without dead ends: 78 [2018-01-21 06:04:39,773 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=117, Unknown=0, NotChecked=0, Total=156 [2018-01-21 06:04:39,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-01-21 06:04:39,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 74. [2018-01-21 06:04:39,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-01-21 06:04:39,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 82 transitions. [2018-01-21 06:04:39,781 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 82 transitions. Word has length 71 [2018-01-21 06:04:39,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:04:39,781 INFO L432 AbstractCegarLoop]: Abstraction has 74 states and 82 transitions. [2018-01-21 06:04:39,781 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 06:04:39,781 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 82 transitions. [2018-01-21 06:04:39,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-01-21 06:04:39,783 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:04:39,783 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2018-01-21 06:04:39,783 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:04:39,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1699645763, now seen corresponding path program 1 times [2018-01-21 06:04:39,784 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:04:39,784 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:39,785 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:04:39,785 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:04:39,785 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:04:39,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:04:39,811 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:04:39,880 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2018-01-21 06:04:39,880 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:04:39,881 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:04:39,881 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 78 with the following transitions: [2018-01-21 06:04:39,881 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 06:04:39,887 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:04:39,887 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:05:07,733 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:05:07,734 INFO L268 AbstractInterpreter]: Visited 50 different actions 161 times. Merged at 30 different actions 59 times. Never widened. Found 8 fixpoints after 4 different actions. Largest state had 25 variables. [2018-01-21 06:05:07,735 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:05:07,736 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:07,736 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:07,741 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:07,741 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:07,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:07,769 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:07,864 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 06:05:07,865 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:08,049 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2018-01-21 06:05:08,072 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:05:08,073 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5] total 13 [2018-01-21 06:05:08,073 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:08,073 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 06:05:08,073 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 06:05:08,074 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2018-01-21 06:05:08,074 INFO L87 Difference]: Start difference. First operand 74 states and 82 transitions. Second operand 8 states. [2018-01-21 06:05:08,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:08,158 INFO L93 Difference]: Finished difference Result 155 states and 174 transitions. [2018-01-21 06:05:08,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:05:08,159 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 77 [2018-01-21 06:05:08,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:08,160 INFO L225 Difference]: With dead ends: 155 [2018-01-21 06:05:08,160 INFO L226 Difference]: Without dead ends: 98 [2018-01-21 06:05:08,160 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 142 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=42, Invalid=168, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:05:08,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2018-01-21 06:05:08,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 79. [2018-01-21 06:05:08,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2018-01-21 06:05:08,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 89 transitions. [2018-01-21 06:05:08,168 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 89 transitions. Word has length 77 [2018-01-21 06:05:08,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:08,169 INFO L432 AbstractCegarLoop]: Abstraction has 79 states and 89 transitions. [2018-01-21 06:05:08,169 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 06:05:08,169 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 89 transitions. [2018-01-21 06:05:08,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 06:05:08,171 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:08,171 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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, 1, 1, 1, 1] [2018-01-21 06:05:08,171 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:08,171 INFO L82 PathProgramCache]: Analyzing trace with hash -1275911246, now seen corresponding path program 1 times [2018-01-21 06:05:08,171 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:08,172 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:08,172 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:08,172 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:08,172 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:08,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:08,190 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:08,262 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 06:05:08,262 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:08,262 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:08,262 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 83 with the following transitions: [2018-01-21 06:05:08,262 INFO L201 CegarAbsIntRunner]: [0], [4], [7], [9], [10], [11], [13], [17], [18], [20], [21], [23], [24], [25], [29], [32], [34], [35], [36], [37], [39], [44], [50], [51], [52], [53], [58], [59], [60], [61], [65], [68], [70], [72], [73], [74], [76], [80], [84], [89], [90], [93], [95], [96], [97], [106], [108], [109], [110], [111], [112], [113], [114], [115] [2018-01-21 06:05:08,264 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:05:08,264 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:05:24,931 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:05:24,931 INFO L268 AbstractInterpreter]: Visited 54 different actions 223 times. Merged at 38 different actions 103 times. Never widened. Found 17 fixpoints after 7 different actions. Largest state had 25 variables. [2018-01-21 06:05:24,941 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:05:24,941 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:24,941 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:24,947 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:24,947 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:24,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:24,973 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:24,989 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 06:05:24,989 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:25,040 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 06:05:25,061 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:25,061 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:25,064 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:25,064 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:25,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:25,112 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:25,119 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 06:05:25,119 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:25,147 INFO L134 CoverageAnalysis]: Checked inductivity of 37 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-01-21 06:05:25,149 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:25,149 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 06:05:25,149 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:25,149 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:05:25,150 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:05:25,150 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:05:25,150 INFO L87 Difference]: Start difference. First operand 79 states and 89 transitions. Second operand 6 states. [2018-01-21 06:05:25,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:25,181 INFO L93 Difference]: Finished difference Result 103 states and 116 transitions. [2018-01-21 06:05:25,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:05:25,181 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 82 [2018-01-21 06:05:25,182 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:25,182 INFO L225 Difference]: With dead ends: 103 [2018-01-21 06:05:25,183 INFO L226 Difference]: Without dead ends: 91 [2018-01-21 06:05:25,183 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 331 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:05:25,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2018-01-21 06:05:25,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 86. [2018-01-21 06:05:25,191 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 06:05:25,192 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 97 transitions. [2018-01-21 06:05:25,193 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 97 transitions. Word has length 82 [2018-01-21 06:05:25,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:25,193 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 97 transitions. [2018-01-21 06:05:25,193 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:05:25,193 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 97 transitions. [2018-01-21 06:05:25,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2018-01-21 06:05:25,195 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:25,196 INFO L322 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:25,196 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:25,196 INFO L82 PathProgramCache]: Analyzing trace with hash 858734366, now seen corresponding path program 2 times [2018-01-21 06:05:25,196 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:25,197 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:25,197 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:25,197 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:25,197 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:25,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:25,223 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:25,330 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 06:05:25,330 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:25,331 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:25,331 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:25,331 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:25,331 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:25,331 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:25,337 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:25,337 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:25,354 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:25,375 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:25,378 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:25,383 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:25,456 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 61 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2018-01-21 06:05:25,456 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:25,620 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 61 proven. 2 refuted. 0 times theorem prover too weak. 53 trivial. 0 not checked. [2018-01-21 06:05:25,641 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:25,641 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:25,645 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:25,645 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:25,662 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:25,704 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:25,732 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:25,738 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:25,754 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 06:05:25,754 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:25,866 INFO L134 CoverageAnalysis]: Checked inductivity of 116 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 89 trivial. 0 not checked. [2018-01-21 06:05:25,868 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:25,868 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 6, 6] total 21 [2018-01-21 06:05:25,868 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:25,869 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 06:05:25,869 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 06:05:25,869 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=328, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:05:25,869 INFO L87 Difference]: Start difference. First operand 86 states and 97 transitions. Second operand 13 states. [2018-01-21 06:05:26,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:26,046 INFO L93 Difference]: Finished difference Result 233 states and 270 transitions. [2018-01-21 06:05:26,047 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:05:26,047 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 118 [2018-01-21 06:05:26,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:26,048 INFO L225 Difference]: With dead ends: 233 [2018-01-21 06:05:26,048 INFO L226 Difference]: Without dead ends: 163 [2018-01-21 06:05:26,049 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 485 GetRequests, 455 SyntacticMatches, 5 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 186 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=152, Invalid=550, Unknown=0, NotChecked=0, Total=702 [2018-01-21 06:05:26,050 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2018-01-21 06:05:26,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 119. [2018-01-21 06:05:26,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2018-01-21 06:05:26,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 135 transitions. [2018-01-21 06:05:26,060 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 135 transitions. Word has length 118 [2018-01-21 06:05:26,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:26,060 INFO L432 AbstractCegarLoop]: Abstraction has 119 states and 135 transitions. [2018-01-21 06:05:26,060 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 06:05:26,061 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 135 transitions. [2018-01-21 06:05:26,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2018-01-21 06:05:26,062 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:26,062 INFO L322 BasicCegarLoop]: trace histogram [9, 7, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:26,063 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:26,063 INFO L82 PathProgramCache]: Analyzing trace with hash 1795019066, now seen corresponding path program 3 times [2018-01-21 06:05:26,063 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:26,063 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:26,064 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:26,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:26,064 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:26,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:26,094 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:26,245 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 247 trivial. 0 not checked. [2018-01-21 06:05:26,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:26,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:26,246 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:26,246 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:26,246 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:26,246 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:26,253 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:26,253 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:26,274 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,291 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,293 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:26,297 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:26,356 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 06:05:26,356 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:26,552 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 06:05:26,571 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:26,572 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:26,574 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:26,574 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:26,592 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,604 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,630 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:26,644 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:26,650 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:26,666 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 06:05:26,667 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:26,837 INFO L134 CoverageAnalysis]: Checked inductivity of 297 backedges. 142 proven. 2 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-01-21 06:05:26,839 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:26,839 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 18 [2018-01-21 06:05:26,839 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:26,840 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:05:26,840 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:05:26,840 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2018-01-21 06:05:26,840 INFO L87 Difference]: Start difference. First operand 119 states and 135 transitions. Second operand 12 states. [2018-01-21 06:05:26,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:26,986 INFO L93 Difference]: Finished difference Result 199 states and 235 transitions. [2018-01-21 06:05:26,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:05:26,986 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 166 [2018-01-21 06:05:26,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:26,988 INFO L225 Difference]: With dead ends: 199 [2018-01-21 06:05:26,988 INFO L226 Difference]: Without dead ends: 169 [2018-01-21 06:05:26,988 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 673 GetRequests, 648 SyntacticMatches, 6 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 86 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:05:26,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-01-21 06:05:26,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 142. [2018-01-21 06:05:26,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 06:05:26,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 163 transitions. [2018-01-21 06:05:27,000 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 163 transitions. Word has length 166 [2018-01-21 06:05:27,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:27,000 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 163 transitions. [2018-01-21 06:05:27,000 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:05:27,000 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 163 transitions. [2018-01-21 06:05:27,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2018-01-21 06:05:27,002 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:27,003 INFO L322 BasicCegarLoop]: trace histogram [12, 12, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:27,003 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:27,003 INFO L82 PathProgramCache]: Analyzing trace with hash -234037377, now seen corresponding path program 4 times [2018-01-21 06:05:27,003 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:27,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:27,004 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:27,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:27,004 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:27,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:27,041 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:27,206 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2018-01-21 06:05:27,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:27,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:27,206 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:27,207 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:27,207 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:27,207 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:27,213 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:27,213 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:27,260 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:27,264 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:27,345 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 395 proven. 10 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2018-01-21 06:05:27,345 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:27,508 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 161 proven. 53 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2018-01-21 06:05:27,527 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:27,528 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:27,530 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:27,530 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:27,637 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:27,646 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:27,680 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 395 proven. 10 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2018-01-21 06:05:27,680 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:27,841 INFO L134 CoverageAnalysis]: Checked inductivity of 631 backedges. 161 proven. 53 refuted. 0 times theorem prover too weak. 417 trivial. 0 not checked. [2018-01-21 06:05:27,843 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:27,843 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11, 11, 11, 11] total 21 [2018-01-21 06:05:27,843 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:27,844 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 06:05:27,844 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 06:05:27,844 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=336, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:05:27,844 INFO L87 Difference]: Start difference. First operand 142 states and 163 transitions. Second operand 17 states. [2018-01-21 06:05:28,083 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:28,083 INFO L93 Difference]: Finished difference Result 451 states and 547 transitions. [2018-01-21 06:05:28,083 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:05:28,084 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 223 [2018-01-21 06:05:28,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:28,086 INFO L225 Difference]: With dead ends: 451 [2018-01-21 06:05:28,086 INFO L226 Difference]: Without dead ends: 356 [2018-01-21 06:05:28,087 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 911 GetRequests, 871 SyntacticMatches, 12 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=697, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:05:28,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2018-01-21 06:05:28,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 181. [2018-01-21 06:05:28,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 06:05:28,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 207 transitions. [2018-01-21 06:05:28,102 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 207 transitions. Word has length 223 [2018-01-21 06:05:28,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:28,103 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 207 transitions. [2018-01-21 06:05:28,103 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 06:05:28,103 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 207 transitions. [2018-01-21 06:05:28,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 284 [2018-01-21 06:05:28,107 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:28,107 INFO L322 BasicCegarLoop]: trace histogram [18, 14, 12, 12, 12, 12, 12, 8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:28,107 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:28,108 INFO L82 PathProgramCache]: Analyzing trace with hash 634716707, now seen corresponding path program 5 times [2018-01-21 06:05:28,108 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:28,109 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:28,109 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:28,109 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:28,109 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:28,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:28,152 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:28,380 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1046 trivial. 0 not checked. [2018-01-21 06:05:28,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:28,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:28,380 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:28,380 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:28,380 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:28,380 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:28,385 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:28,385 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:28,408 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:28,417 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:28,433 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:28,435 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:28,442 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:28,618 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 628 proven. 33 refuted. 0 times theorem prover too weak. 502 trivial. 0 not checked. [2018-01-21 06:05:28,619 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:29,032 INFO L134 CoverageAnalysis]: Checked inductivity of 1163 backedges. 126 proven. 376 refuted. 0 times theorem prover too weak. 661 trivial. 0 not checked. [2018-01-21 06:05:29,065 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:29,065 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:29,071 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:29,071 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:29,106 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:29,136 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown