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/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:01:04,200 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:01:04,202 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:01:04,218 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:01:04,218 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:01:04,219 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:01:04,220 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:01:04,221 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:01:04,222 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:01:04,222 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:01:04,223 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:01:04,224 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:01:04,224 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:01:04,226 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:01:04,227 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:01:04,229 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:01:04,231 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:01:04,233 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:01:04,234 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:01:04,236 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:01:04,238 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:01:04,238 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:01:04,238 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:01:04,239 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:01:04,240 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:01:04,241 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:01:04,242 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:01:04,242 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:01:04,242 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:01:04,242 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:01:04,243 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:01:04,243 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 06:01:04,253 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:01:04,253 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:01:04,254 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:01:04,254 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:01:04,255 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:01:04,255 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:01:04,255 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:01:04,255 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:01:04,256 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:01:04,256 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:01:04,256 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:01:04,256 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:01:04,257 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:01:04,257 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:01:04,257 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:01:04,257 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:01:04,257 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:01:04,258 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:01:04,258 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:01:04,258 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:01:04,258 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:01:04,258 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:01:04,259 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:01:04,259 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:01:04,259 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:01:04,259 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:01:04,259 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:01:04,260 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:01:04,260 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:01:04,260 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:01:04,260 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:01:04,260 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:01:04,261 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:01:04,261 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:01:04,261 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:01:04,261 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:01:04,261 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:01:04,262 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:01:04,262 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:01:04,297 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:01:04,309 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:01:04,312 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:01:04,314 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:01:04,314 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:01:04,315 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 06:01:04,447 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:01:04,452 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:01:04,453 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:01:04,453 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:01:04,457 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:01:04,458 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,460 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3bad2d21 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04, skipping insertion in model container [2018-01-21 06:01:04,460 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,477 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:01:04,495 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:01:04,601 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:01:04,615 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:01:04,622 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04 WrapperNode [2018-01-21 06:01:04,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:01:04,623 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:01:04,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:01:04,624 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:01:04,636 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,636 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,643 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,643 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,646 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,650 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,650 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (1/1) ... [2018-01-21 06:01:04,652 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:01:04,652 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:01:04,652 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:01:04,652 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:01:04,653 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (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 06:01:04,697 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:01:04,698 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:01:04,698 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:01:04,698 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:01:04,698 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:01:04,698 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:01:04,698 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:01:04,699 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:01:04,868 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:01:04,868 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:01:04 BoogieIcfgContainer [2018-01-21 06:01:04,868 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:01:04,869 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:01:04,869 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:01:04,870 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:01:04,871 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:01:04" (1/3) ... [2018-01-21 06:01:04,871 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abea738 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:01:04, skipping insertion in model container [2018-01-21 06:01:04,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:01:04" (2/3) ... [2018-01-21 06:01:04,872 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4abea738 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:01:04, skipping insertion in model container [2018-01-21 06:01:04,872 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:01:04" (3/3) ... [2018-01-21 06:01:04,873 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 06:01:04,879 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:01:04,885 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:01:04,932 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:01:04,932 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:01:04,933 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:01:04,933 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:01:04,933 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:01:04,933 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:01:04,933 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:01:04,934 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:01:04,934 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:01:04,950 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:01:04,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:01:04,955 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:04,956 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:01:04,956 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:01:04,961 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 06:01:04,964 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:05,006 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,006 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:05,006 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,006 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:05,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:01:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:01:05,059 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:01:05,065 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:01:05,072 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:01:05,072 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:01:05,072 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:01:05,072 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:01:05,072 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:01:05,072 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:01:05,072 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:01:05,073 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:01:05,073 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:01:05,074 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:01:05,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:01:05,075 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:05,075 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:05,075 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:01:05,075 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 06:01:05,076 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:05,076 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,077 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:05,077 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,077 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:05,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:05,100 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:05,128 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 06:01:05,129 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:01:05,130 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:01:05,130 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:01:05,131 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:01:05,142 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:01:05,142 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:01:05,146 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:01:05,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:05,175 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:01:05,175 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:01:05,176 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:01:05,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:05,185 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:01:05,185 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:01:05,188 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 06:01:05,271 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:01:05,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:01:05,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:01:05,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:01:05,281 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:01:05,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:05,281 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:01:05,282 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:01:05,282 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:01:05,282 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:01:05,285 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:01:05,285 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:01:05,285 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:01:05,285 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:01:05,285 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:01:05,286 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:01:05,286 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:01:05,286 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:01:05,286 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:01:05,288 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:01:05,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:01:05,289 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:05,289 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 06:01:05,289 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:05,290 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 06:01:05,290 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:05,291 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,291 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:05,291 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,291 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:05,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:05,299 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:05,309 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 06:01:05,309 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:01:05,310 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:01:05,310 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:01:05,310 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:01:05,310 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:01:05,310 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:01:05,310 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:01:05,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:05,314 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:01:05,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:01:05,314 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:01:05,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:05,316 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:01:05,316 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:01:05,317 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 06:01:05,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:01:05,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:01:05,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:01:05,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 06:01:05,327 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 06:01:05,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:05,327 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 06:01:05,327 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:01:05,327 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 06:01:05,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:01:05,328 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:05,328 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 06:01:05,328 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:05,328 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 06:01:05,329 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:05,329 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,329 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:05,330 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,330 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:05,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:05,339 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:05,372 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 06:01:05,373 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:01:05,373 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:01:05,373 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:01:05,375 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:01:05,375 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:01:05,375 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:01:05,376 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 06:01:05,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:05,421 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 06:01:05,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:01:05,421 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:01:05,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:05,424 INFO L225 Difference]: With dead ends: 66 [2018-01-21 06:01:05,424 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:01:05,425 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 06:01:05,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:01:05,434 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 06:01:05,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:01:05,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 06:01:05,435 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 06:01:05,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:05,435 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 06:01:05,435 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:01:05,435 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 06:01:05,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:01:05,436 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:05,436 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] [2018-01-21 06:01:05,436 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:05,437 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 06:01:05,437 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:05,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,438 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:05,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:05,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:05,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:05,455 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:05,510 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 06:01:05,510 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:05,510 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:05,511 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 06:01:05,514 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 06:01:05,565 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:01:05,565 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:01:08,861 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:01:08,863 INFO L268 AbstractInterpreter]: Visited 30 different actions 92 times. Merged at 14 different actions 41 times. Never widened. Found 4 fixpoints after 2 different actions. Largest state had 17 variables. [2018-01-21 06:01:08,878 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:01:08,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:08,878 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 06:01:08,893 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:08,894 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:01:08,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:08,934 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:09,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:01:09,017 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:09,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:01:09,217 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:01:09,217 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 9 [2018-01-21 06:01:09,217 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:01:09,218 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:01:09,218 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:01:09,219 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:01:09,219 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 06:01:09,349 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:09,350 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 06:01:09,350 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:01:09,350 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 06:01:09,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:09,352 INFO L225 Difference]: With dead ends: 80 [2018-01-21 06:01:09,352 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 06:01:09,353 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-01-21 06:01:09,353 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 06:01:09,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 06:01:09,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:01:09,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 06:01:09,359 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 06:01:09,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:09,359 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 06:01:09,359 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:01:09,360 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 06:01:09,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:01:09,361 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:09,361 INFO L322 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2018-01-21 06:01:09,362 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:09,362 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 06:01:09,362 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:09,363 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:09,364 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:09,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:09,364 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:09,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:09,381 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:09,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 06:01:09,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:09,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:09,432 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 06:01:09,432 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 06:01:09,434 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:01:09,434 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:01:11,101 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:01:11,101 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 06:01:11,112 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:01:11,112 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:11,112 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:11,122 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:11,122 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:01:11,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:11,145 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:11,246 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:01:11,246 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:11,415 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:01:11,449 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:11,450 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 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 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:11,456 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:11,457 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:01:11,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:11,490 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:11,506 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 06:01:11,506 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:11,579 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 06:01:11,581 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:11,582 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6, 4, 4] total 13 [2018-01-21 06:01:11,582 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:11,582 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 06:01:11,583 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 06:01:11,583 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2018-01-21 06:01:11,583 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 06:01:11,870 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:11,871 INFO L93 Difference]: Finished difference Result 111 states and 126 transitions. [2018-01-21 06:01:11,871 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:01:11,871 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 06:01:11,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:11,873 INFO L225 Difference]: With dead ends: 111 [2018-01-21 06:01:11,873 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 06:01:11,873 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:01:11,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 06:01:11,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 57. [2018-01-21 06:01:11,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 06:01:11,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 06:01:11,879 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 36 [2018-01-21 06:01:11,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:11,879 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 06:01:11,879 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 06:01:11,879 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 06:01:11,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 06:01:11,881 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:11,881 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 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] [2018-01-21 06:01:11,881 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:11,882 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 2 times [2018-01-21 06:01:11,882 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:11,882 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:11,883 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:11,883 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:11,883 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:11,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:11,905 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:11,969 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 06:01:11,969 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,005 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:12,005 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:12,005 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:12,006 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,006 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 06:01:12,011 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:01:12,011 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:12,023 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:12,038 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:12,039 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:12,043 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:12,100 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:01:12,100 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:12,215 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:01:12,235 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,235 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 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 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:12,238 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:01:12,238 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:12,250 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:12,269 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:12,280 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:12,284 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:12,297 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 06:01:12,297 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:12,335 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 06:01:12,337 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:12,337 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-21 06:01:12,337 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:12,338 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 06:01:12,338 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 06:01:12,338 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-01-21 06:01:12,339 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 11 states. [2018-01-21 06:01:12,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:12,537 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2018-01-21 06:01:12,537 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 06:01:12,537 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2018-01-21 06:01:12,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:12,539 INFO L225 Difference]: With dead ends: 163 [2018-01-21 06:01:12,539 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 06:01:12,539 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2018-01-21 06:01:12,540 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 06:01:12,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 87. [2018-01-21 06:01:12,546 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 06:01:12,547 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2018-01-21 06:01:12,547 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 62 [2018-01-21 06:01:12,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:12,548 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2018-01-21 06:01:12,548 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 06:01:12,548 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2018-01-21 06:01:12,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 06:01:12,550 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:12,550 INFO L322 BasicCegarLoop]: trace histogram [11, 8, 8, 8, 8, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:12,550 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:12,551 INFO L82 PathProgramCache]: Analyzing trace with hash -780821890, now seen corresponding path program 3 times [2018-01-21 06:01:12,551 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:12,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:12,551 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:12,551 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:12,552 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:12,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:12,578 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:12,671 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 06:01:12,672 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,672 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:12,672 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:12,672 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:12,672 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,672 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:12,678 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:01:12,678 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:01:12,691 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,696 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,701 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,707 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,709 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:12,713 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:12,730 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 06:01:12,730 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:12,778 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 06:01:12,799 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:12,799 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 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 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:12,802 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:01:12,802 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:01:12,815 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,824 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,837 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,857 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:12,868 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:12,873 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:12,885 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 06:01:12,886 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:12,918 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 06:01:12,920 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:12,920 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 06:01:12,920 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:12,921 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 06:01:12,921 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 06:01:12,921 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:01:12,921 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand 7 states. [2018-01-21 06:01:12,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:12,976 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2018-01-21 06:01:12,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:01:12,976 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2018-01-21 06:01:12,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:12,978 INFO L225 Difference]: With dead ends: 146 [2018-01-21 06:01:12,978 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 06:01:12,978 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:01:12,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 06:01:12,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-01-21 06:01:12,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 06:01:12,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 06:01:12,987 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 93 [2018-01-21 06:01:12,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:12,988 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 06:01:12,988 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 06:01:12,988 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 06:01:12,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 06:01:12,990 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:12,990 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:12,990 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:12,990 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 4 times [2018-01-21 06:01:12,990 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:12,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:12,991 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:12,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:12,991 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:13,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:13,017 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:13,140 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-21 06:01:13,141 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:13,141 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:13,141 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:13,141 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:13,141 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:13,141 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:13,149 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:01:13,149 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:01:13,180 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:13,183 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:13,251 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 06:01:13,252 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:13,467 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 06:01:13,487 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:13,487 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 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 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:13,491 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:01:13,491 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:01:13,542 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:13,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:13,595 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 06:01:13,595 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:13,805 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 06:01:13,807 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:13,807 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-21 06:01:13,808 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:13,808 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 06:01:13,809 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 06:01:13,809 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:01:13,809 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 15 states. [2018-01-21 06:01:14,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:14,250 INFO L93 Difference]: Finished difference Result 256 states and 287 transitions. [2018-01-21 06:01:14,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:01:14,251 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 119 [2018-01-21 06:01:14,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:14,253 INFO L225 Difference]: With dead ends: 256 [2018-01-21 06:01:14,253 INFO L226 Difference]: Without dead ends: 194 [2018-01-21 06:01:14,254 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 454 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-01-21 06:01:14,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-01-21 06:01:14,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2018-01-21 06:01:14,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 06:01:14,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 06:01:14,269 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 06:01:14,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:14,269 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 06:01:14,269 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 06:01:14,269 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 06:01:14,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 06:01:14,272 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:14,273 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 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] [2018-01-21 06:01:14,273 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:14,273 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 5 times [2018-01-21 06:01:14,273 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:14,274 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:14,274 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:14,274 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:14,274 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:14,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:14,304 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:14,514 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 06:01:14,514 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:14,514 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:14,515 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:14,515 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:14,515 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:14,515 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:14,527 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:01:14,528 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:14,541 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,555 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,560 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,589 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,606 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,623 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,639 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:14,656 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:14,660 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:15,007 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 580 proven. 204 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2018-01-21 06:01:15,007 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:15,442 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 245 proven. 355 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2018-01-21 06:01:15,462 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:15,462 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 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 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:15,468 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:01:15,468 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:15,482 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,487 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,494 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,504 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,543 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,582 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,617 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:15,633 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:15,639 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:15,715 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 607 proven. 208 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-01-21 06:01:15,716 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:15,930 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 277 proven. 376 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2018-01-21 06:01:15,932 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:15,932 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15, 15] total 33 [2018-01-21 06:01:15,932 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:15,933 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:01:15,933 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:01:15,933 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 06:01:15,933 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 21 states. [2018-01-21 06:01:16,368 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:16,368 INFO L93 Difference]: Finished difference Result 307 states and 344 transitions. [2018-01-21 06:01:16,368 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 06:01:16,368 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2018-01-21 06:01:16,369 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:16,371 INFO L225 Difference]: With dead ends: 307 [2018-01-21 06:01:16,371 INFO L226 Difference]: Without dead ends: 233 [2018-01-21 06:01:16,373 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=416, Invalid=2034, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 06:01:16,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-01-21 06:01:16,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 171. [2018-01-21 06:01:16,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-01-21 06:01:16,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2018-01-21 06:01:16,387 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 160 [2018-01-21 06:01:16,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:16,388 INFO L432 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2018-01-21 06:01:16,388 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:01:16,388 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2018-01-21 06:01:16,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-01-21 06:01:16,390 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:16,391 INFO L322 BasicCegarLoop]: trace histogram [30, 24, 24, 24, 24, 7, 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] [2018-01-21 06:01:16,391 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:16,391 INFO L82 PathProgramCache]: Analyzing trace with hash 896426349, now seen corresponding path program 6 times [2018-01-21 06:01:16,391 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:16,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:16,392 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:16,392 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:16,392 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:16,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:16,422 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:16,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 06:01:16,571 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:16,571 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:16,571 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:16,571 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:16,571 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:16,571 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:16,577 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:01:16,577 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:01:16,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,596 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,602 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,604 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,607 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,609 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,613 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,617 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,623 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,627 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,633 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,641 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,642 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:16,646 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:16,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 06:01:16,677 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:16,785 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 06:01:16,806 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:16,806 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 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 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:16,809 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:01:16,809 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:01:16,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,838 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,849 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,861 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,876 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,896 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,921 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:16,959 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:17,010 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:17,139 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:17,307 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:17,541 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:17,565 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:17,572 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:17,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 06:01:17,595 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:17,662 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 06:01:17,664 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:17,664 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 06:01:17,664 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:17,664 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:01:17,665 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:01:17,665 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:01:17,665 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand 10 states. [2018-01-21 06:01:17,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:17,735 INFO L93 Difference]: Finished difference Result 257 states and 288 transitions. [2018-01-21 06:01:17,736 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:01:17,736 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 206 [2018-01-21 06:01:17,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:17,737 INFO L225 Difference]: With dead ends: 257 [2018-01-21 06:01:17,737 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 06:01:17,738 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 816 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:01:17,738 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 06:01:17,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2018-01-21 06:01:17,750 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 06:01:17,751 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 06:01:17,751 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 206 [2018-01-21 06:01:17,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:17,751 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 06:01:17,751 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:01:17,751 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 06:01:17,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 06:01:17,754 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:17,754 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:17,754 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:17,754 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 7 times [2018-01-21 06:01:17,754 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:17,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:17,755 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:17,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:17,755 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:17,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:17,781 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:17,990 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-21 06:01:17,990 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:17,990 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:17,990 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:17,990 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:17,990 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:17,990 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:17,995 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:17,995 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:01:18,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:18,042 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 06:01:18,183 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:18,424 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 06:01:18,444 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:18,444 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 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 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:18,447 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:18,447 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:01:18,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:18,538 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:18,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 06:01:18,574 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:18,788 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 06:01:18,790 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:18,790 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 06:01:18,790 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:18,791 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 06:01:18,791 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 06:01:18,792 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:01:18,792 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 06:01:19,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:19,183 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 06:01:19,183 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 06:01:19,183 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 06:01:19,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:19,185 INFO L225 Difference]: With dead ends: 460 [2018-01-21 06:01:19,185 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 06:01:19,186 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:01:19,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 06:01:19,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 06:01:19,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 06:01:19,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 06:01:19,202 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 06:01:19,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:19,203 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 06:01:19,203 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 06:01:19,203 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 06:01:19,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 06:01:19,205 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:19,206 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:19,206 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:19,206 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 8 times [2018-01-21 06:01:19,206 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:19,207 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:19,207 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:01:19,207 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:19,207 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:19,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:19,255 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:19,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-21 06:01:19,542 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:19,542 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:19,542 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:19,542 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:19,543 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:19,543 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:19,548 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:01:19,548 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:19,569 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:19,605 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:19,611 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:19,619 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:19,818 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 06:01:19,819 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:20,171 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 06:01:20,193 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:20,193 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 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 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:20,197 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:01:20,198 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:20,227 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:20,285 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:20,324 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:20,333 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:20,408 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 06:01:20,409 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:20,641 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 06:01:20,643 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:20,643 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16, 16, 16] total 32 [2018-01-21 06:01:20,643 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:20,643 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-21 06:01:20,644 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-21 06:01:20,644 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:01:20,644 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 25 states. [2018-01-21 06:01:21,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:21,112 INFO L93 Difference]: Finished difference Result 570 states and 639 transitions. [2018-01-21 06:01:21,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 06:01:21,113 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 298 [2018-01-21 06:01:21,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:21,115 INFO L225 Difference]: With dead ends: 570 [2018-01-21 06:01:21,115 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 06:01:21,116 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1155 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:01:21,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 06:01:21,134 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 275. [2018-01-21 06:01:21,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-01-21 06:01:21,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 309 transitions. [2018-01-21 06:01:21,137 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 309 transitions. Word has length 298 [2018-01-21 06:01:21,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:21,138 INFO L432 AbstractCegarLoop]: Abstraction has 275 states and 309 transitions. [2018-01-21 06:01:21,138 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-21 06:01:21,138 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 309 transitions. [2018-01-21 06:01:21,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 06:01:21,141 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:21,141 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:21,141 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:21,141 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 9 times [2018-01-21 06:01:21,141 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:21,142 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:21,142 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:21,142 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:21,143 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:21,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:21,183 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:21,461 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-21 06:01:21,461 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:21,462 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:21,462 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:21,462 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:21,462 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:21,462 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:21,467 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:01:21,467 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:01:21,489 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,504 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,520 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,536 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,553 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,558 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,564 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,571 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,576 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:21,577 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:21,583 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:21,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 06:01:21,872 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:22,214 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 06:01:22,235 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:22,250 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 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 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:22,253 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:01:22,253 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:01:22,290 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,302 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,322 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,359 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,536 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,703 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:22,940 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:23,318 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:01:23,352 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:23,360 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:23,430 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 06:01:23,430 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:23,616 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 06:01:23,618 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:23,618 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 13, 13] total 32 [2018-01-21 06:01:23,618 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:23,619 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:01:23,619 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:01:23,619 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=728, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:01:23,619 INFO L87 Difference]: Start difference. First operand 275 states and 309 transitions. Second operand 21 states. [2018-01-21 06:01:23,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:23,981 INFO L93 Difference]: Finished difference Result 650 states and 740 transitions. [2018-01-21 06:01:23,981 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 06:01:23,981 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 359 [2018-01-21 06:01:23,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:23,985 INFO L225 Difference]: With dead ends: 650 [2018-01-21 06:01:23,985 INFO L226 Difference]: Without dead ends: 601 [2018-01-21 06:01:23,986 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1454 GetRequests, 1414 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=424, Invalid=1136, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:01:23,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2018-01-21 06:01:24,008 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 338. [2018-01-21 06:01:24,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 06:01:24,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 385 transitions. [2018-01-21 06:01:24,010 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 385 transitions. Word has length 359 [2018-01-21 06:01:24,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:24,011 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 385 transitions. [2018-01-21 06:01:24,011 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:01:24,011 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 385 transitions. [2018-01-21 06:01:24,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 06:01:24,013 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:24,013 INFO L322 BasicCegarLoop]: trace histogram [69, 59, 59, 59, 59, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:24,013 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:24,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1164518591, now seen corresponding path program 10 times [2018-01-21 06:01:24,013 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:24,014 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:24,014 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:24,014 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:24,014 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:24,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:24,057 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:24,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 10005 trivial. 0 not checked. [2018-01-21 06:01:24,411 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:24,411 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:24,411 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:24,411 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:24,411 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:24,411 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:24,417 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:01:24,417 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:01:24,488 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:24,495 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:24,768 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 06:01:24,768 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:25,193 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 06:01:25,213 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:25,213 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 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 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:25,216 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:01:25,216 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:01:25,357 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:25,367 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:25,460 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 06:01:25,460 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:25,729 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 06:01:25,730 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:25,731 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20, 20, 20] total 40 [2018-01-21 06:01:25,731 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:25,731 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 06:01:25,731 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 06:01:25,732 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:01:25,732 INFO L87 Difference]: Start difference. First operand 338 states and 385 transitions. Second operand 31 states. [2018-01-21 06:01:26,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:26,696 INFO L93 Difference]: Finished difference Result 858 states and 980 transitions. [2018-01-21 06:01:26,696 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 06:01:26,697 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 425 [2018-01-21 06:01:26,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:26,700 INFO L225 Difference]: With dead ends: 858 [2018-01-21 06:01:26,701 INFO L226 Difference]: Without dead ends: 717 [2018-01-21 06:01:26,702 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1653 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=616, Invalid=2806, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 06:01:26,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2018-01-21 06:01:26,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 398. [2018-01-21 06:01:26,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2018-01-21 06:01:26,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 451 transitions. [2018-01-21 06:01:26,724 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 451 transitions. Word has length 425 [2018-01-21 06:01:26,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:26,724 INFO L432 AbstractCegarLoop]: Abstraction has 398 states and 451 transitions. [2018-01-21 06:01:26,724 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 06:01:26,724 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 451 transitions. [2018-01-21 06:01:26,726 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2018-01-21 06:01:26,727 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:26,727 INFO L322 BasicCegarLoop]: trace histogram [81, 70, 70, 70, 70, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:26,727 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:26,727 INFO L82 PathProgramCache]: Analyzing trace with hash -153318926, now seen corresponding path program 11 times [2018-01-21 06:01:26,727 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:26,728 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:26,728 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:26,728 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:26,728 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:26,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:26,762 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:27,328 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 13945 trivial. 0 not checked. [2018-01-21 06:01:27,329 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:27,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:27,345 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:27,345 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:27,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:27,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:27,350 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:01:27,363 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:27,389 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,394 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,398 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,404 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,411 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,418 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,425 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,433 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,440 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:27,441 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:27,446 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:27,751 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 06:01:27,752 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:28,603 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 06:01:28,623 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:28,623 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 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 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:28,627 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:01:28,627 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:01:28,661 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:28,675 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:28,703 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:28,739 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:28,801 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:28,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:29,051 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:29,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:29,357 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:01:29,388 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:29,397 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:29,507 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 06:01:29,507 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:29,974 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 06:01:29,977 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:01:29,977 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 21, 21, 21] total 44 [2018-01-21 06:01:29,977 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:01:29,978 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-21 06:01:29,978 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-21 06:01:29,979 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1611, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 06:01:29,979 INFO L87 Difference]: Start difference. First operand 398 states and 451 transitions. Second operand 33 states. [2018-01-21 06:01:31,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:01:31,668 INFO L93 Difference]: Finished difference Result 969 states and 1094 transitions. [2018-01-21 06:01:31,668 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 06:01:31,668 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 491 [2018-01-21 06:01:31,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:01:31,670 INFO L225 Difference]: With dead ends: 969 [2018-01-21 06:01:31,670 INFO L226 Difference]: Without dead ends: 555 [2018-01-21 06:01:31,673 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2019 GetRequests, 1925 SyntacticMatches, 20 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=919, Invalid=4781, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 06:01:31,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2018-01-21 06:01:31,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 399. [2018-01-21 06:01:31,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-01-21 06:01:31,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 444 transitions. [2018-01-21 06:01:31,692 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 444 transitions. Word has length 491 [2018-01-21 06:01:31,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:01:31,693 INFO L432 AbstractCegarLoop]: Abstraction has 399 states and 444 transitions. [2018-01-21 06:01:31,693 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-21 06:01:31,693 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 444 transitions. [2018-01-21 06:01:31,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2018-01-21 06:01:31,696 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:01:31,696 INFO L322 BasicCegarLoop]: trace histogram [92, 80, 80, 80, 80, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:01:31,696 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:01:31,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1811475687, now seen corresponding path program 12 times [2018-01-21 06:01:31,696 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:01:31,697 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:31,697 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:01:31,697 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:01:31,697 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:01:31,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:01:31,738 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:01:32,235 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 18116 trivial. 0 not checked. [2018-01-21 06:01:32,235 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:32,235 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:01:32,235 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:01:32,236 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:01:32,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:32,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:01:32,242 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:01:32,242 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:01:32,269 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,278 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,283 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,288 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,294 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,309 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,318 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,333 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,341 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,378 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,391 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,401 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,411 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,421 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,433 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,449 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,461 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,474 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:32,476 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:01:32,482 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:01:32,941 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 06:01:32,942 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:01:33,180 WARN L143 SmtUtils]: Spent 124ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 06:01:33,298 WARN L143 SmtUtils]: Spent 117ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 06:01:33,439 WARN L143 SmtUtils]: Spent 140ms on a formula simplification that was a NOOP. DAG size: 40 [2018-01-21 06:01:33,588 WARN L143 SmtUtils]: Spent 148ms on a formula simplification that was a NOOP. DAG size: 40 [2018-01-21 06:01:34,015 WARN L143 SmtUtils]: Spent 120ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 06:01:34,461 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 06:01:34,481 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:01:34,481 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 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 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:01:34,484 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:01:34,484 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:01:34,515 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:34,526 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:34,550 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:34,580 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:34,639 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:34,740 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:35,411 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:01:46,432 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown