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_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength4_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:33:31,712 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:33:31,714 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:33:31,729 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:33:31,729 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:33:31,730 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:33:31,731 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:33:31,733 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:33:31,735 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:33:31,736 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:33:31,737 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:33:31,737 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:33:31,738 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:33:31,739 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:33:31,740 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:33:31,742 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:33:31,744 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:33:31,746 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:33:31,748 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:33:31,749 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:33:31,751 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:33:31,751 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:33:31,752 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:33:31,753 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:33:31,754 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:33:31,755 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:33:31,755 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:33:31,756 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:33:31,756 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:33:31,756 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:33:31,757 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:33:31,757 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_smtcomp.epf [2018-01-21 10:33:31,766 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:33:31,766 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:33:31,767 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:33:31,767 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:33:31,767 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:33:31,768 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:33:31,768 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:33:31,768 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:33:31,768 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:33:31,768 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:33:31,768 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:33:31,769 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:33:31,770 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:33:31,770 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:33:31,770 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:33:31,770 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:33:31,770 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:33:31,770 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:33:31,771 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:33:31,771 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:33:31,771 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:33:31,771 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:33:31,771 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:33:31,772 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:33:31,773 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:33:31,773 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:33:31,807 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:33:31,818 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:33:31,821 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:33:31,823 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:33:31,823 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:33:31,824 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength4_true-valid-memsafety_true-termination.c [2018-01-21 10:33:31,949 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:33:31,954 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:33:31,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:33:31,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:33:31,960 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:33:31,962 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:33:31" (1/1) ... [2018-01-21 10:33:31,964 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@52ce74ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:31, skipping insertion in model container [2018-01-21 10:33:31,965 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:33:31" (1/1) ... [2018-01-21 10:33:31,979 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:33:31,994 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:33:32,113 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:33:32,130 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:33:32,137 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32 WrapperNode [2018-01-21 10:33:32,137 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:33:32,138 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:33:32,138 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:33:32,138 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:33:32,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,151 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,159 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,159 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,163 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,166 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,167 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (1/1) ... [2018-01-21 10:33:32,169 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:33:32,170 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:33:32,170 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:33:32,170 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:33:32,171 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (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 10:33:32,222 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:33:32,223 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:33:32,223 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:33:32,223 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:33:32,223 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:33:32,223 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:33:32,223 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:33:32,224 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:33:32,403 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:33:32,403 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:33:32 BoogieIcfgContainer [2018-01-21 10:33:32,403 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:33:32,404 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:33:32,404 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:33:32,406 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:33:32,406 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:33:31" (1/3) ... [2018-01-21 10:33:32,407 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2391dd03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:33:32, skipping insertion in model container [2018-01-21 10:33:32,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:33:32" (2/3) ... [2018-01-21 10:33:32,408 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2391dd03 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:33:32, skipping insertion in model container [2018-01-21 10:33:32,408 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:33:32" (3/3) ... [2018-01-21 10:33:32,411 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength4_true-valid-memsafety_true-termination.c [2018-01-21 10:33:32,418 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:33:32,424 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:33:32,474 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:33:32,474 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:33:32,474 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:33:32,474 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:33:32,474 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:33:32,474 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:33:32,474 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:33:32,475 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:33:32,475 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:33:32,491 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:33:32,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:33:32,497 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:32,498 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:33:32,499 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:33:32,505 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 10:33:32,507 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:32,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,555 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:32,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,556 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:32,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:33:32,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:33:32,614 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:33:32,622 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:33:32,629 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:33:32,629 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:33:32,630 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:33:32,630 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:33:32,630 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:33:32,630 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:33:32,630 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:33:32,630 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:33:32,630 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:33:32,632 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:33:32,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:33:32,632 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:32,633 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:33:32,633 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:33:32,633 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 10:33:32,633 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:32,634 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,634 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:32,634 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,634 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:32,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:32,656 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:32,687 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 10:33:32,689 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:33:32,689 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:33:32,689 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:33:32,691 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:33:32,702 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:33:32,702 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:33:32,704 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:33:32,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:32,735 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:33:32,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:33:32,737 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:33:32,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:32,745 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:33:32,746 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:33:32,750 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 10:33:32,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:33:32,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:33:32,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:33:32,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:33:32,839 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:33:32,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:32,839 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:33:32,839 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:33:32,839 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:33:32,839 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:33:32,842 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:33:32,842 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:33:32,842 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:33:32,843 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:33:32,843 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:33:32,843 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:33:32,843 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:33:32,843 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:33:32,843 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:33:32,846 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 10:33:32,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:33:32,847 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:32,848 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 10:33:32,848 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:32,848 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 10:33:32,848 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:32,849 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,850 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:32,850 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,850 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:32,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:32,860 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:32,874 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 10:33:32,874 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:33:32,875 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:33:32,875 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:33:32,875 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:33:32,875 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:33:32,875 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:33:32,876 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 10:33:32,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:32,882 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 10:33:32,882 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:33:32,882 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:33:32,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:32,885 INFO L225 Difference]: With dead ends: 72 [2018-01-21 10:33:32,885 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 10:33:32,885 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 10:33:32,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 10:33:32,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 10:33:32,897 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 10:33:32,898 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 10:33:32,898 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 10:33:32,899 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:32,899 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 10:33:32,899 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:33:32,899 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 10:33:32,900 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:33:32,900 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:32,900 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 10:33:32,900 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:32,900 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 10:33:32,901 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:32,902 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,902 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:32,902 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:32,902 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:32,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:32,917 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:32,957 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 10:33:32,958 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:33:32,958 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:33:32,958 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:33:32,960 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:33:32,961 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:33:32,961 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:33:32,961 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 10:33:33,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:33,021 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 10:33:33,021 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:33:33,021 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:33:33,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:33,025 INFO L225 Difference]: With dead ends: 66 [2018-01-21 10:33:33,025 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:33:33,026 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 10:33:33,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:33:33,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 10:33:33,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 10:33:33,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 10:33:33,038 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 10:33:33,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:33,038 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 10:33:33,038 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:33:33,038 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 10:33:33,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 10:33:33,039 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:33,039 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 10:33:33,039 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:33,039 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 10:33:33,040 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:33,041 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:33,041 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:33,041 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:33,041 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:33,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:33,062 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:33,225 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 10:33:33,225 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:33:33,225 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 10:33:33,225 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:33:33,226 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:33:33,226 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:33:33,226 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 10:33:33,226 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 10:33:33,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:33,291 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 10:33:33,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:33:33,292 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 10:33:33,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:33,293 INFO L225 Difference]: With dead ends: 80 [2018-01-21 10:33:33,293 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 10:33:33,294 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-01-21 10:33:33,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 10:33:33,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 10:33:33,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 10:33:33,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 10:33:33,300 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 10:33:33,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:33,301 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 10:33:33,301 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:33:33,301 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 10:33:33,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 10:33:33,303 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:33,303 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 10:33:33,303 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:33,303 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 10:33:33,303 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:33,305 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:33,305 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:33,305 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:33,305 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:33,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:33,322 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:33,432 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 10:33:33,483 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:33,483 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:33,484 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 10:33:33,486 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 10:33:33,533 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:33:33,534 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:33:34,646 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:33:34,648 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 10:33:34,658 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:33:34,659 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:34,659 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 10:33:34,673 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:34,674 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:34,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:34,707 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:34,855 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 10:33:34,855 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:35,141 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 10:33:35,164 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:35,164 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:35,177 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:35,177 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:35,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:35,210 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:35,262 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 10:33:35,262 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:35,335 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [MP cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (3)] Exception during sending of exit command (exit): Broken pipe [2018-01-21 10:33:35,340 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:35,340 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-21 10:33:35,340 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:35,341 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 10:33:35,341 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 10:33:35,342 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-21 10:33:35,342 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 10:33:35,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:35,591 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-21 10:33:35,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:33:35,592 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 10:33:35,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:35,593 INFO L225 Difference]: With dead ends: 87 [2018-01-21 10:33:35,593 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 10:33:35,594 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:33:35,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 10:33:35,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-21 10:33:35,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 10:33:35,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 10:33:35,601 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 10:33:35,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:35,601 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 10:33:35,601 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 10:33:35,602 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 10:33:35,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 10:33:35,603 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:35,603 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:33:35,603 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:35,603 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 10:33:35,604 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:35,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:35,605 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:35,605 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:35,605 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:35,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:35,623 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:35,725 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:33:35,725 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:35,725 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:35,725 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:35,726 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:35,726 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:35,726 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:35,731 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:35,732 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:35,742 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:35,747 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:35,748 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:35,750 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:35,806 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:33:35,807 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:35,928 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:33:35,949 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:35,949 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 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 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:35,952 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:35,952 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:35,964 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:35,976 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:35,988 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:35,993 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:36,018 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 10:33:36,018 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:36,044 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-01-21 10:33:36,046 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:36,046 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-21 10:33:36,046 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:36,046 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:33:36,046 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:33:36,047 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 10:33:36,047 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-21 10:33:36,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:36,173 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-21 10:33:36,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:33:36,174 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-21 10:33:36,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:36,176 INFO L225 Difference]: With dead ends: 97 [2018-01-21 10:33:36,176 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 10:33:36,177 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:33:36,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 10:33:36,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-21 10:33:36,182 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 10:33:36,183 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-21 10:33:36,183 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-21 10:33:36,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:36,184 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-21 10:33:36,184 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:33:36,184 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-21 10:33:36,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 10:33:36,185 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:36,185 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 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] [2018-01-21 10:33:36,186 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:36,186 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-21 10:33:36,186 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:36,187 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:36,187 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:36,187 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:36,187 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:36,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:36,203 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:36,374 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 2 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:33:36,374 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:36,374 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:36,375 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:36,375 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:36,375 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:36,375 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:36,391 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:33:36,391 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:33:36,401 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:36,405 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:36,405 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:36,408 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:36,428 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:33:36,428 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:36,459 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:33:36,479 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:36,479 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:36,482 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:33:36,483 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:33:36,493 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:36,502 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:36,509 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:36,513 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:36,519 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:33:36,519 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:36,558 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-01-21 10:33:36,561 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:36,562 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-21 10:33:36,562 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:36,562 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 10:33:36,563 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 10:33:36,563 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:33:36,563 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-21 10:33:36,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:36,697 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-21 10:33:36,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:33:36,697 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-21 10:33:36,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:36,699 INFO L225 Difference]: With dead ends: 131 [2018-01-21 10:33:36,699 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 10:33:36,700 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-21 10:33:36,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 10:33:36,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-21 10:33:36,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 10:33:36,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 10:33:36,708 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-21 10:33:36,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:36,709 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 10:33:36,709 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 10:33:36,709 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 10:33:36,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 10:33:36,713 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:36,713 INFO L322 BasicCegarLoop]: trace histogram [10, 8, 8, 8, 8, 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 10:33:36,713 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:36,713 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-21 10:33:36,713 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:36,714 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:36,714 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:36,715 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:36,715 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:36,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:36,738 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:37,072 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:33:37,073 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:37,073 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:37,073 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:37,073 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:37,073 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:37,073 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:37,078 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:33:37,079 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:33:37,104 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:37,108 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 10:33:37,187 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:37,375 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:33:37,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:37,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:37,402 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:33:37,402 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:33:37,457 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:37,463 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:37,476 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 107 proven. 38 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2018-01-21 10:33:37,476 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:37,559 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 5 proven. 139 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2018-01-21 10:33:37,561 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:37,561 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 10:33:37,561 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:37,561 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:33:37,562 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:33:37,562 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:33:37,562 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-21 10:33:37,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:37,710 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-21 10:33:37,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 10:33:37,711 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-21 10:33:37,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:37,712 INFO L225 Difference]: With dead ends: 134 [2018-01-21 10:33:37,712 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 10:33:37,713 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:33:37,714 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 10:33:37,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-21 10:33:37,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 10:33:37,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 10:33:37,721 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-21 10:33:37,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:37,722 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 10:33:37,722 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:33:37,722 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 10:33:37,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-21 10:33:37,725 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:37,725 INFO L322 BasicCegarLoop]: trace histogram [12, 10, 10, 10, 10, 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 10:33:37,725 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:37,725 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-21 10:33:37,725 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:37,726 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:37,726 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:37,726 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:37,726 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:37,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:37,747 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:37,932 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:33:37,932 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:37,932 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:37,932 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:37,932 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:37,932 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:37,932 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:37,938 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:33:37,938 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:37,945 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,946 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,948 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,950 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,952 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,956 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:37,957 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:37,959 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:38,055 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 10:33:38,055 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:38,237 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:33:38,258 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:38,258 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:38,263 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:33:38,263 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:38,271 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,274 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,281 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,291 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,302 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,320 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:38,328 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:38,332 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:38,346 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 156 proven. 60 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2018-01-21 10:33:38,346 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:38,463 INFO L134 CoverageAnalysis]: Checked inductivity of 280 backedges. 5 proven. 210 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2018-01-21 10:33:38,466 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:38,466 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 10:33:38,466 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:38,467 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 10:33:38,467 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 10:33:38,467 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-21 10:33:38,467 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-21 10:33:38,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:38,713 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-21 10:33:38,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:33:38,714 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-21 10:33:38,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:38,715 INFO L225 Difference]: With dead ends: 144 [2018-01-21 10:33:38,715 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 10:33:38,716 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 382 GetRequests, 352 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=268, Invalid=602, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:33:38,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 10:33:38,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-21 10:33:38,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 10:33:38,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-21 10:33:38,722 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-21 10:33:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:38,722 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-21 10:33:38,722 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 10:33:38,722 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-21 10:33:38,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-21 10:33:38,724 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:38,724 INFO L322 BasicCegarLoop]: trace histogram [14, 12, 12, 12, 12, 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 10:33:38,724 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:38,724 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-21 10:33:38,724 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:38,725 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:38,725 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:38,725 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:38,725 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:38,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:38,744 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:39,055 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 5 proven. 296 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2018-01-21 10:33:39,056 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:39,056 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:39,056 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:39,056 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:39,056 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:39,056 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:39,062 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:33:39,062 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:33:39,073 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,075 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,078 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,080 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,084 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,085 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:39,088 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:39,115 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:33:39,115 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:39,180 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:33:39,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:39,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:39,207 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:33:39,207 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:33:39,221 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,228 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,238 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,251 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,270 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:39,280 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:39,284 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:39,291 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:33:39,291 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:39,307 INFO L134 CoverageAnalysis]: Checked inductivity of 393 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 384 trivial. 0 not checked. [2018-01-21 10:33:39,309 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:39,309 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-21 10:33:39,309 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:39,309 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 10:33:39,309 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 10:33:39,310 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-21 10:33:39,310 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-21 10:33:39,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:39,421 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-21 10:33:39,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 10:33:39,422 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-21 10:33:39,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:39,423 INFO L225 Difference]: With dead ends: 183 [2018-01-21 10:33:39,423 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 10:33:39,423 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:33:39,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 10:33:39,431 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-21 10:33:39,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 10:33:39,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-21 10:33:39,432 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-21 10:33:39,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:39,433 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-21 10:33:39,433 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 10:33:39,433 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-21 10:33:39,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-21 10:33:39,436 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:39,436 INFO L322 BasicCegarLoop]: trace histogram [24, 21, 21, 21, 21, 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 10:33:39,436 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:39,437 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-21 10:33:39,437 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:39,437 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:39,438 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:39,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:39,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:39,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:39,459 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:39,731 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:33:39,731 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:39,731 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:39,732 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:39,732 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:39,732 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:39,732 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:39,737 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:39,737 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:39,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:39,768 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:39,921 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 10:33:39,921 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:40,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:33:40,169 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:40,169 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:40,172 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:40,172 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:40,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:40,236 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:40,262 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 566 proven. 119 refuted. 0 times theorem prover too weak. 530 trivial. 0 not checked. [2018-01-21 10:33:40,262 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:40,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1215 backedges. 8 proven. 675 refuted. 0 times theorem prover too weak. 532 trivial. 0 not checked. [2018-01-21 10:33:40,356 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:40,356 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 10:33:40,356 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:40,357 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 10:33:40,357 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 10:33:40,357 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-21 10:33:40,358 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-21 10:33:40,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:40,578 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-21 10:33:40,579 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 10:33:40,579 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-21 10:33:40,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:40,580 INFO L225 Difference]: With dead ends: 182 [2018-01-21 10:33:40,580 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 10:33:40,581 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 650 GetRequests, 612 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 206 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=432, Invalid=974, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:33:40,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 10:33:40,588 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-21 10:33:40,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 10:33:40,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-21 10:33:40,590 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-21 10:33:40,590 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:40,590 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-21 10:33:40,590 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 10:33:40,590 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-21 10:33:40,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 10:33:40,593 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:40,593 INFO L322 BasicCegarLoop]: trace histogram [27, 24, 24, 24, 24, 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 10:33:40,594 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:40,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-21 10:33:40,594 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:40,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:40,595 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:40,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:40,595 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:40,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:40,621 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:40,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:33:40,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:40,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:40,922 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:40,922 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:40,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:40,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:40,927 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:40,927 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:40,941 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:40,957 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:40,960 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:40,963 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:41,088 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 10:33:41,088 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:41,348 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:33:41,369 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:41,369 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 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 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:41,372 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:41,372 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:41,388 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:41,419 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:41,444 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:41,450 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:41,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 724 proven. 156 refuted. 0 times theorem prover too weak. 683 trivial. 0 not checked. [2018-01-21 10:33:41,473 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:41,596 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 8 proven. 870 refuted. 0 times theorem prover too weak. 685 trivial. 0 not checked. [2018-01-21 10:33:41,598 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:41,598 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 10:33:41,598 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:41,599 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 10:33:41,599 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 10:33:41,599 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-21 10:33:41,599 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-21 10:33:41,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:41,836 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-21 10:33:41,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 10:33:41,836 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-21 10:33:41,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:41,837 INFO L225 Difference]: With dead ends: 192 [2018-01-21 10:33:41,837 INFO L226 Difference]: Without dead ends: 104 [2018-01-21 10:33:41,838 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 10:33:41,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-21 10:33:41,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-21 10:33:41,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 10:33:41,844 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-21 10:33:41,844 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-21 10:33:41,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:41,844 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-21 10:33:41,844 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 10:33:41,845 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-21 10:33:41,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-21 10:33:41,847 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:41,848 INFO L322 BasicCegarLoop]: trace histogram [30, 27, 27, 27, 27, 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 10:33:41,848 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:41,848 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-21 10:33:41,848 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:41,849 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:41,849 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:41,849 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:41,849 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:41,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:41,875 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:42,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 8 proven. 1090 refuted. 0 times theorem prover too weak. 858 trivial. 0 not checked. [2018-01-21 10:33:42,186 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:42,187 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:42,187 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:42,187 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:42,187 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:42,187 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:42,192 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:33:42,192 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:33:42,214 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,220 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,223 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,224 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:42,227 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:33:42,267 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:42,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:33:42,356 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:42,357 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 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 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:42,359 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:33:42,359 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:33:42,375 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,383 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,425 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:42,436 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:42,441 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:42,465 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:33:42,466 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:42,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1956 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 1935 trivial. 0 not checked. [2018-01-21 10:33:42,519 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:42,520 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-21 10:33:42,520 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:42,520 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 10:33:42,520 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 10:33:42,520 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-21 10:33:42,520 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-21 10:33:42,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:42,670 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-21 10:33:42,670 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:33:42,670 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-21 10:33:42,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:42,672 INFO L225 Difference]: With dead ends: 236 [2018-01-21 10:33:42,672 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 10:33:42,673 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-21 10:33:42,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 10:33:42,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-21 10:33:42,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 10:33:42,680 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-21 10:33:42,680 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-21 10:33:42,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:42,681 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-21 10:33:42,681 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 10:33:42,681 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-21 10:33:42,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-21 10:33:42,684 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:42,684 INFO L322 BasicCegarLoop]: trace histogram [44, 40, 40, 40, 40, 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 10:33:42,684 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:42,684 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-21 10:33:42,684 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:42,685 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:42,685 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:42,685 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:42,685 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:42,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:42,708 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:43,180 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:33:43,180 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:43,180 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:43,180 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:43,180 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:43,180 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:43,180 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:43,185 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:33:43,186 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:33:43,244 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:43,248 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:43,495 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 10:33:43,496 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:43,880 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:33:43,900 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:43,900 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 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 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:43,903 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:33:43,903 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:33:44,226 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:44,235 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:44,273 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 1649 proven. 245 refuted. 0 times theorem prover too weak. 2400 trivial. 0 not checked. [2018-01-21 10:33:44,273 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:44,450 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 11 proven. 1880 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2018-01-21 10:33:44,453 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:44,453 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 10:33:44,453 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:44,454 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 10:33:44,454 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 10:33:44,454 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:33:44,454 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-21 10:33:44,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:44,789 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-21 10:33:44,790 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 10:33:44,790 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-21 10:33:44,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:44,793 INFO L225 Difference]: With dead ends: 230 [2018-01-21 10:33:44,793 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 10:33:44,794 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1080 GetRequests, 1030 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 368 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=753, Invalid=1697, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:33:44,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 10:33:44,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-21 10:33:44,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 10:33:44,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-21 10:33:44,804 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-21 10:33:44,804 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:44,804 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-21 10:33:44,804 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 10:33:44,804 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-21 10:33:44,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-21 10:33:44,806 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:44,807 INFO L322 BasicCegarLoop]: trace histogram [48, 44, 44, 44, 44, 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 10:33:44,807 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:44,807 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-21 10:33:44,807 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:44,808 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:44,808 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:44,808 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:44,808 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:44,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:44,839 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:45,447 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:33:45,447 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:45,447 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:45,447 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:45,448 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:45,448 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:45,448 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:45,457 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:33:45,457 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:45,474 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,476 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,478 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,481 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,484 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,488 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,493 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,500 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,505 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,512 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,528 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,539 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:45,540 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:45,546 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:45,795 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 10:33:45,795 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:46,237 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:33:46,258 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:46,258 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 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 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:46,260 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:33:46,261 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:46,279 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,282 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,289 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,300 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,317 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,344 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,385 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,436 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,516 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,639 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:46,808 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:47,038 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:47,330 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:47,375 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:47,383 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:47,426 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 1976 proven. 297 refuted. 0 times theorem prover too weak. 2883 trivial. 0 not checked. [2018-01-21 10:33:47,426 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:47,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5156 backedges. 11 proven. 2259 refuted. 0 times theorem prover too weak. 2886 trivial. 0 not checked. [2018-01-21 10:33:47,634 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:47,634 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 10:33:47,634 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:47,634 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 10:33:47,635 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 10:33:47,635 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 10:33:47,636 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-21 10:33:48,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:48,023 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-21 10:33:48,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:33:48,023 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-21 10:33:48,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:48,024 INFO L225 Difference]: With dead ends: 240 [2018-01-21 10:33:48,024 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 10:33:48,025 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 10:33:48,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 10:33:48,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-21 10:33:48,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-21 10:33:48,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-21 10:33:48,031 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-21 10:33:48,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:48,032 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-21 10:33:48,032 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 10:33:48,032 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-21 10:33:48,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-21 10:33:48,033 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:48,033 INFO L322 BasicCegarLoop]: trace histogram [52, 48, 48, 48, 48, 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 10:33:48,033 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:48,033 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-21 10:33:48,033 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:48,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:48,034 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:48,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:48,034 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:48,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:48,055 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:48,557 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 11 proven. 2673 refuted. 0 times theorem prover too weak. 3414 trivial. 0 not checked. [2018-01-21 10:33:48,557 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:48,571 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:48,572 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:48,572 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:48,572 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:48,572 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:48,577 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:33:48,577 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:33:48,597 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,611 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,626 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,637 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,641 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,644 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,648 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,651 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,656 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,658 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:48,661 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:48,735 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:33:48,735 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:48,844 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:33:48,878 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:48,879 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 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 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:48,883 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:33:48,883 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:33:48,919 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,928 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,944 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:48,983 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:49,010 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:49,045 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:49,122 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:49,371 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:33:49,393 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:49,399 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:49,452 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:33:49,453 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:49,501 INFO L134 CoverageAnalysis]: Checked inductivity of 6098 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 6060 trivial. 0 not checked. [2018-01-21 10:33:49,503 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:49,503 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-21 10:33:49,503 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:49,504 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:33:49,504 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:33:49,504 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:33:49,504 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-21 10:33:49,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:49,637 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-21 10:33:49,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 10:33:49,637 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-21 10:33:49,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:49,638 INFO L225 Difference]: With dead ends: 289 [2018-01-21 10:33:49,639 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 10:33:49,639 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-21 10:33:49,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 10:33:49,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-21 10:33:49,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-21 10:33:49,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-21 10:33:49,645 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-21 10:33:49,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:49,645 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-21 10:33:49,646 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:33:49,646 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-21 10:33:49,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-21 10:33:49,647 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:49,647 INFO L322 BasicCegarLoop]: trace histogram [70, 65, 65, 65, 65, 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 10:33:49,647 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:49,648 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-21 10:33:49,648 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:49,648 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:49,648 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:49,649 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:49,649 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:49,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:49,675 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:50,306 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:33:50,307 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:50,307 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:50,307 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:50,307 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:50,307 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:50,307 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:50,314 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:50,314 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:50,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:50,409 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:51,371 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 10:33:51,372 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:51,582 WARN L143 SmtUtils]: Spent 119ms on a formula simplification that was a NOOP. DAG size: 49 [2018-01-21 10:33:52,106 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:33:52,134 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:52,134 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 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 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:52,137 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:52,137 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:33:52,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:52,282 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:52,352 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 3626 proven. 416 refuted. 0 times theorem prover too weak. 7128 trivial. 0 not checked. [2018-01-21 10:33:52,352 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:52,588 INFO L134 CoverageAnalysis]: Checked inductivity of 11170 backedges. 14 proven. 4024 refuted. 0 times theorem prover too weak. 7132 trivial. 0 not checked. [2018-01-21 10:33:52,589 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:52,590 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 10:33:52,590 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:52,590 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 10:33:52,591 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 10:33:52,591 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 10:33:52,591 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-21 10:33:52,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:52,970 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-21 10:33:52,970 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 10:33:52,971 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-21 10:33:52,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:52,972 INFO L225 Difference]: With dead ends: 278 [2018-01-21 10:33:52,972 INFO L226 Difference]: Without dead ends: 147 [2018-01-21 10:33:52,974 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 10:33:52,975 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-21 10:33:52,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-21 10:33:52,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-21 10:33:52,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-21 10:33:52,983 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-21 10:33:52,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:52,983 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-21 10:33:52,983 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 10:33:52,983 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-21 10:33:52,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 10:33:52,986 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:52,986 INFO L322 BasicCegarLoop]: trace histogram [75, 70, 70, 70, 70, 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 10:33:52,987 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:52,987 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-21 10:33:52,987 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:52,988 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:52,988 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:33:52,988 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:52,988 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:53,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:53,024 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:53,968 WARN L146 SmtUtils]: Spent 115ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 10:33:54,156 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:33:54,156 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:54,157 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:54,157 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:54,157 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:54,157 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:54,157 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:54,162 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:54,162 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:54,181 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:54,217 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:54,224 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:54,228 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:54,565 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 10:33:54,565 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:55,475 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:33:55,496 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:55,496 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 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 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:33:55,500 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:33:55,500 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:33:55,532 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:55,609 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:33:55,666 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:55,680 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:55,793 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 4182 proven. 483 refuted. 0 times theorem prover too weak. 8230 trivial. 0 not checked. [2018-01-21 10:33:55,793 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:56,032 INFO L134 CoverageAnalysis]: Checked inductivity of 12895 backedges. 14 proven. 4647 refuted. 0 times theorem prover too weak. 8234 trivial. 0 not checked. [2018-01-21 10:33:56,034 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:33:56,034 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 10:33:56,034 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:33:56,035 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 10:33:56,035 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 10:33:56,036 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 10:33:56,036 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-21 10:33:56,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:33:56,665 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-21 10:33:56,665 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 10:33:56,665 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-21 10:33:56,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:33:56,667 INFO L225 Difference]: With dead ends: 288 [2018-01-21 10:33:56,667 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 10:33:56,669 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 10:33:56,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 10:33:56,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-21 10:33:56,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-21 10:33:56,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-21 10:33:56,676 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-21 10:33:56,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:33:56,677 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-21 10:33:56,677 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 10:33:56,677 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-21 10:33:56,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-21 10:33:56,680 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:33:56,680 INFO L322 BasicCegarLoop]: trace histogram [80, 75, 75, 75, 75, 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 10:33:56,680 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:33:56,681 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-21 10:33:56,681 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:33:56,681 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:56,682 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:33:56,682 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:33:56,682 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:33:56,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:33:56,718 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:33:57,677 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 14 proven. 5315 refuted. 0 times theorem prover too weak. 9416 trivial. 0 not checked. [2018-01-21 10:33:57,678 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:57,678 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:33:57,678 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:33:57,678 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:33:57,678 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:33:57,678 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:33:57,684 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:33:57,685 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:33:57,709 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,712 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,716 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,720 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,725 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,729 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,733 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,737 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,743 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,750 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,756 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,763 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,770 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,779 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,788 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,801 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,811 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:33:57,812 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:33:57,816 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:33:58,774 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 10:33:58,774 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:33:58,987 WARN L143 SmtUtils]: Spent 207ms on a formula simplification that was a NOOP. DAG size: 55 [2018-01-21 10:33:59,190 WARN L143 SmtUtils]: Spent 202ms on a formula simplification that was a NOOP. DAG size: 55 [2018-01-21 10:33:59,423 WARN L143 SmtUtils]: Spent 179ms on a formula simplification that was a NOOP. DAG size: 55 [2018-01-21 10:33:59,625 WARN L143 SmtUtils]: Spent 202ms on a formula simplification that was a NOOP. DAG size: 55 [2018-01-21 10:34:00,803 INFO L134 CoverageAnalysis]: Checked inductivity of 14745 backedges. 4778 proven. 555 refuted. 0 times theorem prover too weak. 9412 trivial. 0 not checked. [2018-01-21 10:34:00,830 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:34:00,831 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 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 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:34:00,833 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:34:00,834 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:34:00,864 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:00,874 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:00,892 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:00,911 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:00,948 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:01,018 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:01,135 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:01,318 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:01,587 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:02,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:02,921 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:03,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:34:15,909 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown