java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:05:43,741 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:05:43,743 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:05:43,760 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:05:43,761 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:05:43,762 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:05:43,763 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:05:43,765 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:05:43,767 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:05:43,768 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:05:43,769 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:05:43,770 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:05:43,771 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:05:43,772 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:05:43,773 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:05:43,776 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:05:43,779 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:05:43,781 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:05:43,782 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:05:43,784 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:05:43,786 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:05:43,787 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:05:43,787 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:05:43,788 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:05:43,789 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:05:43,790 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:05:43,791 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:05:43,791 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:05:43,791 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:05:43,792 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:05:43,792 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:05:43,793 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf [2018-01-21 06:05:43,803 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:05:43,804 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:05:43,805 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:05:43,805 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:05:43,805 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:05:43,805 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:05:43,805 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:05:43,806 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:05:43,806 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:05:43,807 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:05:43,807 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:05:43,807 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:05:43,807 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:05:43,807 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:05:43,808 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:05:43,809 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:05:43,809 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:05:43,809 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:05:43,809 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:05:43,809 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:05:43,810 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:05:43,810 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:05:43,810 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:05:43,810 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:05:43,811 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:05:43,812 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:05:43,812 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:05:43,813 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:05:43,813 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:05:43,851 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:05:43,865 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:05:43,869 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:05:43,871 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:05:43,872 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:05:43,872 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 06:05:44,025 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:05:44,030 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:05:44,031 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:05:44,031 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:05:44,036 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:05:44,037 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,040 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60aa16d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44, skipping insertion in model container [2018-01-21 06:05:44,040 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,055 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:05:44,072 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:05:44,191 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:05:44,208 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:05:44,214 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44 WrapperNode [2018-01-21 06:05:44,214 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:05:44,215 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:05:44,215 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:05:44,215 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:05:44,227 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,228 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,236 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,237 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,240 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,243 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,245 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... [2018-01-21 06:05:44,247 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:05:44,248 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:05:44,248 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:05:44,248 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:05:44,249 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:05:44,302 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:05:44,302 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:05:44,302 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:05:44,302 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:05:44,302 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:05:44,302 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:05:44,302 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:05:44,302 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:05:44,303 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:05:44,303 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:05:44,303 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:05:44,303 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:05:44,303 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:05:44,479 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:05:44,479 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:05:44 BoogieIcfgContainer [2018-01-21 06:05:44,479 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:05:44,480 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:05:44,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:05:44,482 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:05:44,482 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:05:44" (1/3) ... [2018-01-21 06:05:44,483 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a6cf941 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:05:44, skipping insertion in model container [2018-01-21 06:05:44,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:44" (2/3) ... [2018-01-21 06:05:44,483 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5a6cf941 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:05:44, skipping insertion in model container [2018-01-21 06:05:44,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:05:44" (3/3) ... [2018-01-21 06:05:44,485 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength6_true-valid-memsafety_true-termination.c [2018-01-21 06:05:44,491 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:05:44,498 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:05:44,545 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:44,545 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:44,545 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:44,546 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:44,546 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:44,546 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:44,546 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:44,546 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:05:44,547 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:44,561 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:44,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:05:44,567 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:44,569 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:05:44,569 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:05:44,575 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 06:05:44,578 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:44,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,623 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:44,623 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,624 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:44,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:05:44,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:05:44,679 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:05:44,685 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:05:44,691 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:44,691 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:44,691 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:44,691 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:44,691 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:44,691 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:44,691 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:44,691 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:05:44,692 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:44,693 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:44,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:05:44,694 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:44,694 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:44,694 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:05:44,695 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 06:05:44,695 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:44,696 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,696 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:44,696 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,696 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:44,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:44,718 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:44,752 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:44,755 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:44,755 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:05:44,755 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:44,758 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:05:44,770 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:05:44,770 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:44,772 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:05:44,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:44,803 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:05:44,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:05:44,805 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:05:44,806 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:44,814 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:05:44,814 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:05:44,818 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:44,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:05:44,906 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:05:44,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:05:44,907 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:05:44,909 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:05:44,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:44,909 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:05:44,909 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:05:44,909 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:05:44,909 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:05:44,912 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:44,912 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:44,912 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:44,912 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:44,912 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:44,913 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:44,913 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:44,913 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:05:44,913 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:44,915 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:44,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:05:44,917 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:44,917 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:44,917 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:44,917 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 06:05:44,917 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:44,918 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,919 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:44,919 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,919 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:44,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:44,929 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:44,943 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:44,944 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:44,944 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:05:44,944 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:44,945 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:05:44,945 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:05:44,945 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:44,945 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:05:44,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:44,952 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:05:44,952 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:05:44,952 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:05:44,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:44,954 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:05:44,954 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:05:44,955 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:44,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:05:44,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:05:44,967 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:05:44,968 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 06:05:44,969 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 06:05:44,969 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:44,969 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 06:05:44,969 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:05:44,969 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 06:05:44,970 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:05:44,970 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:44,971 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:44,971 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:44,971 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 06:05:44,971 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:44,972 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,972 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:44,972 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:44,973 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:44,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:44,986 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:45,024 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,025 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:45,025 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:05:45,025 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:45,027 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:05:45,027 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:05:45,028 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:05:45,028 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 06:05:45,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:45,081 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 06:05:45,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:05:45,082 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:05:45,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:45,086 INFO L225 Difference]: With dead ends: 66 [2018-01-21 06:05:45,086 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:05:45,087 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:05:45,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:05:45,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 06:05:45,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:05:45,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 06:05:45,102 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 06:05:45,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:45,103 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 06:05:45,103 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:05:45,103 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 06:05:45,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:05:45,104 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:45,105 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:45,105 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:45,105 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 06:05:45,105 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:45,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,106 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:45,107 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,107 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:45,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:45,130 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:45,279 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,279 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:45,280 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-01-21 06:05:45,280 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:45,280 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:05:45,280 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:05:45,281 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2018-01-21 06:05:45,281 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 06:05:45,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:45,356 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 06:05:45,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:05:45,357 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 06:05:45,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:45,358 INFO L225 Difference]: With dead ends: 80 [2018-01-21 06:05:45,358 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 06:05:45,359 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 06:05:45,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 06:05:45,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 06:05:45,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 06:05:45,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 06:05:45,365 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 06:05:45,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:45,365 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 06:05:45,365 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:05:45,365 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 06:05:45,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 06:05:45,366 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:45,366 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:45,366 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:45,367 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 06:05:45,367 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:45,368 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,368 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:45,368 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,368 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:45,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:45,382 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:45,491 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,492 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:45,492 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:45,493 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 06:05:45,495 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 06:05:45,553 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:05:45,554 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:05:48,944 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:05:48,946 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 06:05:48,958 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:05:48,958 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:48,958 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:48,978 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:48,978 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:49,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:49,007 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:49,150 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:49,150 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:49,482 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:49,504 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:49,504 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:49,516 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:49,517 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:49,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:49,550 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:49,626 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 06:05:49,627 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:49,718 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 06:05:49,720 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:49,721 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 4, 4] total 15 [2018-01-21 06:05:49,721 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:49,721 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 06:05:49,722 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 06:05:49,722 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2018-01-21 06:05:49,722 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 06:05:49,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:49,974 INFO L93 Difference]: Finished difference Result 87 states and 94 transitions. [2018-01-21 06:05:49,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:05:49,975 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 06:05:49,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:49,976 INFO L225 Difference]: With dead ends: 87 [2018-01-21 06:05:49,976 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:05:49,977 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 133 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=74, Invalid=232, Unknown=0, NotChecked=0, Total=306 [2018-01-21 06:05:49,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:05:49,982 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2018-01-21 06:05:49,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 06:05:49,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-01-21 06:05:49,984 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 36 [2018-01-21 06:05:49,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:49,985 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-01-21 06:05:49,985 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 06:05:49,985 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-01-21 06:05:49,986 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 06:05:49,986 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:49,986 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 06:05:49,986 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:49,987 INFO L82 PathProgramCache]: Analyzing trace with hash -524554428, now seen corresponding path program 2 times [2018-01-21 06:05:49,987 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:49,988 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:49,988 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:49,988 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:49,988 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:50,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:50,004 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:50,132 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 06:05:50,132 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,133 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:50,133 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:50,133 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:50,133 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,133 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:50,144 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:50,144 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:50,156 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:50,167 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:50,172 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:50,175 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:50,277 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 06:05:50,277 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:50,383 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 06:05:50,404 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,404 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 06:05:50,407 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:50,407 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:50,419 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:50,430 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:50,438 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:50,442 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:50,470 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 06:05:50,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:50,522 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 06:05:50,524 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:50,524 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 4, 4] total 18 [2018-01-21 06:05:50,524 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:50,525 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:05:50,525 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:05:50,525 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=237, Unknown=0, NotChecked=0, Total=306 [2018-01-21 06:05:50,525 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 10 states. [2018-01-21 06:05:50,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:50,655 INFO L93 Difference]: Finished difference Result 97 states and 104 transitions. [2018-01-21 06:05:50,656 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:05:50,656 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 41 [2018-01-21 06:05:50,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:50,656 INFO L225 Difference]: With dead ends: 97 [2018-01-21 06:05:50,657 INFO L226 Difference]: Without dead ends: 56 [2018-01-21 06:05:50,657 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 151 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:05:50,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-01-21 06:05:50,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 53. [2018-01-21 06:05:50,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 06:05:50,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-01-21 06:05:50,661 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 41 [2018-01-21 06:05:50,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:50,662 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-01-21 06:05:50,662 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:05:50,662 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-01-21 06:05:50,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 06:05:50,663 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:50,663 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 06:05:50,663 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:50,664 INFO L82 PathProgramCache]: Analyzing trace with hash -438141712, now seen corresponding path program 3 times [2018-01-21 06:05:50,664 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:50,665 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:50,665 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:50,665 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:50,665 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:50,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:50,680 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:50,876 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 06:05:50,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:50,877 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:50,877 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:50,877 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,877 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:50,887 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:50,887 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:50,897 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:50,902 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:50,904 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:50,907 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:51,000 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 06:05:51,000 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:51,093 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 06:05:51,126 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,127 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:51,133 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:51,133 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:51,147 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:51,156 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:51,163 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:51,167 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:51,173 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 06:05:51,173 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:51,193 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 06:05:51,194 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:51,230 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4, 4, 4] total 11 [2018-01-21 06:05:51,230 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:51,231 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 06:05:51,231 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 06:05:51,231 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:05:51,231 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 9 states. [2018-01-21 06:05:51,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:51,339 INFO L93 Difference]: Finished difference Result 131 states and 146 transitions. [2018-01-21 06:05:51,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:05:51,340 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 46 [2018-01-21 06:05:51,340 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:51,342 INFO L225 Difference]: With dead ends: 131 [2018-01-21 06:05:51,342 INFO L226 Difference]: Without dead ends: 85 [2018-01-21 06:05:51,342 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 180 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:05:51,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2018-01-21 06:05:51,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 67. [2018-01-21 06:05:51,350 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2018-01-21 06:05:51,351 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 72 transitions. [2018-01-21 06:05:51,351 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 72 transitions. Word has length 46 [2018-01-21 06:05:51,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:51,352 INFO L432 AbstractCegarLoop]: Abstraction has 67 states and 72 transitions. [2018-01-21 06:05:51,352 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 06:05:51,352 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 72 transitions. [2018-01-21 06:05:51,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2018-01-21 06:05:51,356 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:51,356 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 06:05:51,356 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:51,356 INFO L82 PathProgramCache]: Analyzing trace with hash 515188947, now seen corresponding path program 4 times [2018-01-21 06:05:51,356 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:51,357 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:51,357 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:51,358 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:51,358 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:51,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:51,380 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:51,559 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 06:05:51,559 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,559 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:51,560 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:51,560 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:51,560 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,560 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:51,565 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:51,565 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:51,587 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:51,590 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:51,654 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 06:05:51,654 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:51,851 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 06:05:51,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:51,886 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:51,886 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:51,944 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:51,949 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:51,959 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 06:05:51,959 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:52,012 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 06:05:52,014 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:52,014 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 06:05:52,014 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:52,015 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 06:05:52,015 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 06:05:52,016 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=270, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:05:52,016 INFO L87 Difference]: Start difference. First operand 67 states and 72 transitions. Second operand 14 states. [2018-01-21 06:05:52,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:52,171 INFO L93 Difference]: Finished difference Result 134 states and 145 transitions. [2018-01-21 06:05:52,171 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 06:05:52,171 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 82 [2018-01-21 06:05:52,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:52,173 INFO L225 Difference]: With dead ends: 134 [2018-01-21 06:05:52,173 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 06:05:52,174 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 340 GetRequests, 314 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=201, Invalid=449, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:05:52,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 06:05:52,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2018-01-21 06:05:52,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-01-21 06:05:52,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-01-21 06:05:52,181 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 82 [2018-01-21 06:05:52,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:52,181 INFO L432 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-01-21 06:05:52,181 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 06:05:52,181 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-01-21 06:05:52,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2018-01-21 06:05:52,183 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:52,183 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 06:05:52,183 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:52,183 INFO L82 PathProgramCache]: Analyzing trace with hash -611097235, now seen corresponding path program 5 times [2018-01-21 06:05:52,183 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:52,184 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:52,184 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:52,184 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:52,184 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:52,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:52,202 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:52,396 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 06:05:52,396 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,396 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:52,396 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:52,397 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:52,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:52,411 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:52,412 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:52,421 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,422 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,424 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,426 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,428 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,433 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,439 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:52,442 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:52,593 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 06:05:52,594 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:52,758 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 06:05:52,779 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,779 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:52,782 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:52,783 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:52,791 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,794 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,801 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,810 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,821 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,838 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,848 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:52,852 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:52,863 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 06:05:52,864 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:52,929 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 06:05:52,930 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:52,930 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 06:05:52,931 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:52,931 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 06:05:52,931 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 06:05:52,931 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=361, Unknown=0, NotChecked=0, Total=506 [2018-01-21 06:05:52,931 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 16 states. [2018-01-21 06:05:53,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:53,172 INFO L93 Difference]: Finished difference Result 144 states and 155 transitions. [2018-01-21 06:05:53,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:05:53,172 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 92 [2018-01-21 06:05:53,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:53,173 INFO L225 Difference]: With dead ends: 144 [2018-01-21 06:05:53,173 INFO L226 Difference]: Without dead ends: 80 [2018-01-21 06:05:53,174 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 06:05:53,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2018-01-21 06:05:53,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 77. [2018-01-21 06:05:53,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-01-21 06:05:53,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 82 transitions. [2018-01-21 06:05:53,180 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 82 transitions. Word has length 92 [2018-01-21 06:05:53,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:53,180 INFO L432 AbstractCegarLoop]: Abstraction has 77 states and 82 transitions. [2018-01-21 06:05:53,181 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 06:05:53,181 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 82 transitions. [2018-01-21 06:05:53,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2018-01-21 06:05:53,182 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:53,182 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 06:05:53,182 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:53,182 INFO L82 PathProgramCache]: Analyzing trace with hash -556985837, now seen corresponding path program 6 times [2018-01-21 06:05:53,182 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:53,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,183 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:53,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,183 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:53,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:53,201 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:53,384 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 06:05:53,384 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:53,385 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:53,385 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:53,385 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:53,385 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:53,385 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:53,390 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:05:53,390 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:05:53,399 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,400 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,403 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,405 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,408 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,409 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:53,411 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:53,433 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 06:05:53,433 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:53,484 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 06:05:53,504 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:53,504 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:53,507 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:05:53,507 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:05:53,518 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,524 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,535 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,547 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,565 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,575 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:53,578 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:53,590 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 06:05:53,591 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:53,618 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 06:05:53,620 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:53,620 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 5, 5, 5] total 16 [2018-01-21 06:05:53,620 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:53,620 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 06:05:53,621 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 06:05:53,621 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=175, Unknown=0, NotChecked=0, Total=240 [2018-01-21 06:05:53,621 INFO L87 Difference]: Start difference. First operand 77 states and 82 transitions. Second operand 13 states. [2018-01-21 06:05:53,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:53,763 INFO L93 Difference]: Finished difference Result 183 states and 202 transitions. [2018-01-21 06:05:53,763 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 06:05:53,763 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 102 [2018-01-21 06:05:53,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:53,764 INFO L225 Difference]: With dead ends: 183 [2018-01-21 06:05:53,764 INFO L226 Difference]: Without dead ends: 114 [2018-01-21 06:05:53,765 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 417 GetRequests, 402 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:05:53,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2018-01-21 06:05:53,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 91. [2018-01-21 06:05:53,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2018-01-21 06:05:53,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 98 transitions. [2018-01-21 06:05:53,775 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 98 transitions. Word has length 102 [2018-01-21 06:05:53,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:53,775 INFO L432 AbstractCegarLoop]: Abstraction has 91 states and 98 transitions. [2018-01-21 06:05:53,776 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 06:05:53,776 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 98 transitions. [2018-01-21 06:05:53,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2018-01-21 06:05:53,779 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:53,779 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 06:05:53,779 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:53,779 INFO L82 PathProgramCache]: Analyzing trace with hash 294495146, now seen corresponding path program 7 times [2018-01-21 06:05:53,779 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:53,780 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,780 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:53,780 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,781 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:53,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:53,805 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:54,123 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 06:05:54,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,123 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:54,123 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:54,123 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:54,123 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,123 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:54,129 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:54,129 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:54,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:54,161 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:54,286 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 06:05:54,286 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:54,538 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 06:05:54,558 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,558 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:54,561 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:54,561 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:54,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:54,624 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:54,652 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 06:05:54,652 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:54,747 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 06:05:54,749 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:54,749 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 06:05:54,749 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:54,750 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 06:05:54,750 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 06:05:54,751 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=230, Invalid=582, Unknown=0, NotChecked=0, Total=812 [2018-01-21 06:05:54,751 INFO L87 Difference]: Start difference. First operand 91 states and 98 transitions. Second operand 20 states. [2018-01-21 06:05:54,966 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:54,966 INFO L93 Difference]: Finished difference Result 182 states and 198 transitions. [2018-01-21 06:05:54,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 06:05:54,967 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 158 [2018-01-21 06:05:54,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:54,968 INFO L225 Difference]: With dead ends: 182 [2018-01-21 06:05:54,968 INFO L226 Difference]: Without dead ends: 99 [2018-01-21 06:05:54,969 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 06:05:54,969 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-01-21 06:05:54,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 96. [2018-01-21 06:05:54,976 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 06:05:54,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2018-01-21 06:05:54,977 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 158 [2018-01-21 06:05:54,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:54,978 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2018-01-21 06:05:54,978 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 06:05:54,978 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2018-01-21 06:05:54,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 174 [2018-01-21 06:05:54,981 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:54,981 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 06:05:54,981 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:54,981 INFO L82 PathProgramCache]: Analyzing trace with hash 1051815268, now seen corresponding path program 8 times [2018-01-21 06:05:54,981 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:54,982 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:54,982 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:54,982 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:54,983 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:55,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:55,003 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:55,233 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 06:05:55,233 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:55,233 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:55,234 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:55,234 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:55,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:55,234 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 06:05:55,239 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:55,239 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:55,251 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,270 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,273 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:55,278 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:55,437 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 06:05:55,437 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:55,738 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 06:05:55,759 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:55,759 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 06:05:55,762 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:55,762 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:55,779 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,809 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,834 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:55,841 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:55,875 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 06:05:55,875 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:55,984 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 06:05:55,986 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:55,986 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 06:05:55,986 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:55,986 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 06:05:55,987 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 06:05:55,987 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=712, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:05:55,987 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand 22 states. [2018-01-21 06:05:56,221 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:56,253 INFO L93 Difference]: Finished difference Result 192 states and 208 transitions. [2018-01-21 06:05:56,253 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:05:56,253 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 173 [2018-01-21 06:05:56,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:56,254 INFO L225 Difference]: With dead ends: 192 [2018-01-21 06:05:56,254 INFO L226 Difference]: Without dead ends: 104 [2018-01-21 06:05:56,255 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 670 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=529, Invalid=1193, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 06:05:56,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-01-21 06:05:56,260 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 101. [2018-01-21 06:05:56,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 06:05:56,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 108 transitions. [2018-01-21 06:05:56,261 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 108 transitions. Word has length 173 [2018-01-21 06:05:56,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:56,262 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 108 transitions. [2018-01-21 06:05:56,262 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 06:05:56,262 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 108 transitions. [2018-01-21 06:05:56,265 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2018-01-21 06:05:56,265 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:56,265 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 06:05:56,265 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:56,265 INFO L82 PathProgramCache]: Analyzing trace with hash 1142155370, now seen corresponding path program 9 times [2018-01-21 06:05:56,265 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:56,266 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:56,266 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:56,266 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:56,267 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:56,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:56,291 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:56,866 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 06:05:56,866 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:56,866 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:56,866 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:56,867 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:56,867 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:56,867 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 06:05:56,872 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:56,872 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:56,885 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:56,888 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:56,891 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:56,896 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:56,898 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:56,903 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:56,973 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 06:05:56,973 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:57,061 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 06:05:57,082 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:57,082 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 06:05:57,085 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:57,085 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:57,101 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:57,109 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:57,123 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:57,144 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:57,155 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:57,160 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:57,186 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 06:05:57,186 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:57,229 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 06:05:57,230 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:57,230 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 6, 6, 6, 6] total 21 [2018-01-21 06:05:57,230 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:57,231 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 06:05:57,231 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 06:05:57,231 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2018-01-21 06:05:57,231 INFO L87 Difference]: Start difference. First operand 101 states and 108 transitions. Second operand 17 states. [2018-01-21 06:05:57,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:57,412 INFO L93 Difference]: Finished difference Result 236 states and 260 transitions. [2018-01-21 06:05:57,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:05:57,413 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 188 [2018-01-21 06:05:57,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:57,415 INFO L225 Difference]: With dead ends: 236 [2018-01-21 06:05:57,415 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 06:05:57,416 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 764 GetRequests, 744 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=124, Invalid=338, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:05:57,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 06:05:57,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 115. [2018-01-21 06:05:57,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2018-01-21 06:05:57,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 124 transitions. [2018-01-21 06:05:57,425 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 124 transitions. Word has length 188 [2018-01-21 06:05:57,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:57,426 INFO L432 AbstractCegarLoop]: Abstraction has 115 states and 124 transitions. [2018-01-21 06:05:57,426 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 06:05:57,426 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 124 transitions. [2018-01-21 06:05:57,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 265 [2018-01-21 06:05:57,430 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:57,430 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 06:05:57,430 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:57,430 INFO L82 PathProgramCache]: Analyzing trace with hash 132824627, now seen corresponding path program 10 times [2018-01-21 06:05:57,431 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:57,431 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:57,432 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:57,432 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:57,432 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:57,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:57,464 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:57,896 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 06:05:57,897 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:57,897 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:57,897 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:57,897 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:57,897 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:57,897 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 06:05:57,902 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:57,902 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:57,954 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:57,959 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:58,139 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 06:05:58,140 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:58,505 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 06:05:58,526 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:58,526 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 06:05:58,528 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:58,529 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:58,868 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:58,877 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:58,923 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 06:05:58,923 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:59,102 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 06:05:59,104 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:59,105 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 06:05:59,105 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:59,105 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 06:05:59,105 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 06:05:59,106 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=395, Invalid=1011, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:05:59,106 INFO L87 Difference]: Start difference. First operand 115 states and 124 transitions. Second operand 26 states. [2018-01-21 06:05:59,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:59,485 INFO L93 Difference]: Finished difference Result 230 states and 251 transitions. [2018-01-21 06:05:59,485 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:05:59,486 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 264 [2018-01-21 06:05:59,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:59,488 INFO L225 Difference]: With dead ends: 230 [2018-01-21 06:05:59,488 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 06:05:59,490 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 06:05:59,490 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 06:05:59,497 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 120. [2018-01-21 06:05:59,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-01-21 06:05:59,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 129 transitions. [2018-01-21 06:05:59,499 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 129 transitions. Word has length 264 [2018-01-21 06:05:59,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:59,499 INFO L432 AbstractCegarLoop]: Abstraction has 120 states and 129 transitions. [2018-01-21 06:05:59,499 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 06:05:59,499 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 129 transitions. [2018-01-21 06:05:59,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 285 [2018-01-21 06:05:59,501 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:59,501 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 06:05:59,502 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:59,502 INFO L82 PathProgramCache]: Analyzing trace with hash -171303065, now seen corresponding path program 11 times [2018-01-21 06:05:59,502 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:59,503 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:59,503 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:59,503 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:59,503 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:59,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:59,534 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:59,943 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 06:05:59,943 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:59,943 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:59,943 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:59,943 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:59,943 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:59,943 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 06:05:59,949 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:59,950 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:59,965 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,967 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,969 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,972 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,975 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,978 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,982 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,986 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,991 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:59,997 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,003 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,011 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,021 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,023 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:00,027 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:00,288 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 06:06:00,288 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:00,732 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 06:06:00,772 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:00,773 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 06:06:00,776 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:00,776 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:00,798 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,801 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,809 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,843 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,875 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,936 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:00,997 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:01,088 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:01,228 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:01,408 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:01,655 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:01,960 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:02,005 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:02,013 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:02,056 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 06:06:02,057 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:02,233 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 06:06:02,236 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:02,236 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 06:06:02,236 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:02,236 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 06:06:02,237 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 06:06:02,237 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:06:02,238 INFO L87 Difference]: Start difference. First operand 120 states and 129 transitions. Second operand 28 states. [2018-01-21 06:06:02,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:02,655 INFO L93 Difference]: Finished difference Result 240 states and 261 transitions. [2018-01-21 06:06:02,655 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 06:06:02,655 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 284 [2018-01-21 06:06:02,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:02,656 INFO L225 Difference]: With dead ends: 240 [2018-01-21 06:06:02,656 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 06:06:02,657 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1162 GetRequests, 1108 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 432 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=880, Invalid=1982, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 06:06:02,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 06:06:02,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 125. [2018-01-21 06:06:02,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2018-01-21 06:06:02,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 134 transitions. [2018-01-21 06:06:02,664 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 134 transitions. Word has length 284 [2018-01-21 06:06:02,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:02,664 INFO L432 AbstractCegarLoop]: Abstraction has 125 states and 134 transitions. [2018-01-21 06:06:02,664 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 06:06:02,664 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 134 transitions. [2018-01-21 06:06:02,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2018-01-21 06:06:02,666 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:02,666 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 06:06:02,666 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:02,666 INFO L82 PathProgramCache]: Analyzing trace with hash -2029948749, now seen corresponding path program 12 times [2018-01-21 06:06:02,666 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:02,667 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:02,667 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:02,667 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:02,667 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:02,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:02,689 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:03,205 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 06:06:03,205 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:03,205 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:03,206 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:03,206 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:03,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:03,206 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 06:06:03,211 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:03,211 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:03,230 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,238 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,241 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,248 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,252 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,256 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,261 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,266 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,271 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,273 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:03,276 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:03,345 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 06:06:03,345 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:03,482 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 06:06:03,518 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:03,518 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 06:06:03,521 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:03,522 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:03,558 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,567 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,585 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,625 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,690 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:03,774 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:04,064 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:04,090 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:04,098 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:04,151 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 06:06:04,151 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:04,239 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 06:06:04,241 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:04,241 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 7, 7, 7, 7] total 26 [2018-01-21 06:06:04,242 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:04,242 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:06:04,242 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:06:04,242 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=172, Invalid=478, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:06:04,242 INFO L87 Difference]: Start difference. First operand 125 states and 134 transitions. Second operand 21 states. [2018-01-21 06:06:04,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:04,458 INFO L93 Difference]: Finished difference Result 289 states and 318 transitions. [2018-01-21 06:06:04,458 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:06:04,458 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 304 [2018-01-21 06:06:04,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:04,459 INFO L225 Difference]: With dead ends: 289 [2018-01-21 06:06:04,459 INFO L226 Difference]: Without dead ends: 172 [2018-01-21 06:06:04,460 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1231 GetRequests, 1206 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=187, Invalid=515, Unknown=0, NotChecked=0, Total=702 [2018-01-21 06:06:04,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2018-01-21 06:06:04,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 139. [2018-01-21 06:06:04,465 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 139 states. [2018-01-21 06:06:04,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 139 states to 139 states and 150 transitions. [2018-01-21 06:06:04,466 INFO L78 Accepts]: Start accepts. Automaton has 139 states and 150 transitions. Word has length 304 [2018-01-21 06:06:04,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:04,467 INFO L432 AbstractCegarLoop]: Abstraction has 139 states and 150 transitions. [2018-01-21 06:06:04,467 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:06:04,467 INFO L276 IsEmpty]: Start isEmpty. Operand 139 states and 150 transitions. [2018-01-21 06:06:04,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2018-01-21 06:06:04,469 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:04,469 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 06:06:04,469 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:04,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1350287972, now seen corresponding path program 13 times [2018-01-21 06:06:04,469 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:04,470 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:04,470 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:04,470 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:04,470 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:04,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:04,496 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:05,138 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 06:06:05,138 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:05,138 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:05,138 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:05,138 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:05,139 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:05,139 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 06:06:05,144 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:05,144 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:05,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:05,226 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:05,573 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 06:06:05,573 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:06,146 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 06:06:06,179 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:06,179 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 06:06:06,182 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:06,182 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:06,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:06,341 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:06,461 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 06:06:06,462 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:06,653 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 06:06:06,655 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:06,655 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 06:06:06,655 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:06,656 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:06:06,656 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:06:06,657 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=605, Invalid=1557, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:06:06,657 INFO L87 Difference]: Start difference. First operand 139 states and 150 transitions. Second operand 32 states. [2018-01-21 06:06:07,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:07,045 INFO L93 Difference]: Finished difference Result 278 states and 304 transitions. [2018-01-21 06:06:07,045 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 06:06:07,046 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 400 [2018-01-21 06:06:07,046 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:07,048 INFO L225 Difference]: With dead ends: 278 [2018-01-21 06:06:07,048 INFO L226 Difference]: Without dead ends: 147 [2018-01-21 06:06:07,050 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1630 GetRequests, 1568 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 575 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1164, Invalid=2618, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 06:06:07,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2018-01-21 06:06:07,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 144. [2018-01-21 06:06:07,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-01-21 06:06:07,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 155 transitions. [2018-01-21 06:06:07,059 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 155 transitions. Word has length 400 [2018-01-21 06:06:07,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:07,060 INFO L432 AbstractCegarLoop]: Abstraction has 144 states and 155 transitions. [2018-01-21 06:06:07,060 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:06:07,060 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 155 transitions. [2018-01-21 06:06:07,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 06:06:07,063 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:07,063 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 06:06:07,063 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:07,064 INFO L82 PathProgramCache]: Analyzing trace with hash -1570210812, now seen corresponding path program 14 times [2018-01-21 06:06:07,064 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:07,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:07,065 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:07,065 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:07,065 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:07,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:07,098 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:08,202 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 06:06:08,202 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:08,202 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:08,203 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:08,203 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:08,203 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:08,203 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 06:06:08,209 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:08,210 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:08,235 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:08,276 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:08,288 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:08,295 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:08,705 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 06:06:08,705 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:10,083 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 06:06:10,104 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:10,105 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 06:06:10,108 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:10,108 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:10,141 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:10,220 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:10,286 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:10,300 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:10,402 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 06:06:10,402 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:10,612 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 06:06:10,614 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:10,614 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 06:06:10,614 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:10,615 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 06:06:10,615 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 06:06:10,615 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=685, Invalid=1765, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 06:06:10,615 INFO L87 Difference]: Start difference. First operand 144 states and 155 transitions. Second operand 34 states. [2018-01-21 06:06:11,035 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:11,035 INFO L93 Difference]: Finished difference Result 288 states and 314 transitions. [2018-01-21 06:06:11,035 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:06:11,035 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 425 [2018-01-21 06:06:11,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:11,037 INFO L225 Difference]: With dead ends: 288 [2018-01-21 06:06:11,037 INFO L226 Difference]: Without dead ends: 152 [2018-01-21 06:06:11,038 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1732 GetRequests, 1666 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1321, Invalid=2969, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 06:06:11,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2018-01-21 06:06:11,043 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 149. [2018-01-21 06:06:11,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2018-01-21 06:06:11,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 160 transitions. [2018-01-21 06:06:11,044 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 160 transitions. Word has length 425 [2018-01-21 06:06:11,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:11,044 INFO L432 AbstractCegarLoop]: Abstraction has 149 states and 160 transitions. [2018-01-21 06:06:11,044 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 06:06:11,044 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 160 transitions. [2018-01-21 06:06:11,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2018-01-21 06:06:11,046 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:11,046 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 06:06:11,046 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:11,046 INFO L82 PathProgramCache]: Analyzing trace with hash -877517212, now seen corresponding path program 15 times [2018-01-21 06:06:11,047 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:11,047 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:11,047 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:11,047 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:11,047 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:11,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:11,072 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:11,647 WARN L146 SmtUtils]: Spent 102ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 06:06:11,777 WARN L146 SmtUtils]: Spent 104ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 06:06:11,930 WARN L146 SmtUtils]: Spent 110ms on a formula simplification. DAG size of input: 13 DAG size of output 12 [2018-01-21 06:06:12,332 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 06:06:12,332 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:12,332 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:12,332 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:12,333 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:12,333 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:12,333 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 06:06:12,338 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:12,338 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:12,358 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,361 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,364 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,368 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,373 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,377 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,381 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,385 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,392 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,398 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,405 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,411 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,419 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,427 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,436 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,450 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:12,461 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:12,466 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:12,850 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 06:06:12,851 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:14,069 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 06:06:14,089 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:14,089 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 06:06:14,092 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:14,093 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:14,126 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,135 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,149 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,169 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,207 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,279 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,576 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:14,853 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:15,624 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:16,300 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:17,258 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Received shutdown request... [2018-01-21 06:06:29,294 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown