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/ArraysOfVariableLength_false-valid-deref-read.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 05:59:27,903 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 05:59:27,905 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 05:59:27,920 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 05:59:27,920 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 05:59:27,921 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 05:59:27,923 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 05:59:27,924 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 05:59:27,927 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 05:59:27,928 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 05:59:27,928 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 05:59:27,929 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 05:59:27,930 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 05:59:27,931 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 05:59:27,931 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 05:59:27,933 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 05:59:27,936 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 05:59:27,938 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 05:59:27,939 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 05:59:27,940 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 05:59:27,943 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 05:59:27,943 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 05:59:27,943 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 05:59:27,944 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 05:59:27,945 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 05:59:27,946 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 05:59:27,946 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 05:59:27,947 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 05:59:27,947 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 05:59:27,947 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 05:59:27,948 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 05:59:27,948 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 05:59:27,958 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 05:59:27,958 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 05:59:27,959 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 05:59:27,959 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 05:59:27,960 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 05:59:27,960 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 05:59:27,960 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 05:59:27,960 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 05:59:27,961 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 05:59:27,961 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 05:59:27,961 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 05:59:27,961 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 05:59:27,962 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 05:59:27,963 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 05:59:27,963 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 05:59:27,963 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 05:59:27,963 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 05:59:27,963 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 05:59:27,964 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 05:59:27,964 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 05:59:27,964 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 05:59:27,964 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 05:59:27,964 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 05:59:27,965 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 05:59:27,965 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 05:59:27,965 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 05:59:27,965 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 05:59:27,965 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 05:59:27,966 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 05:59:27,966 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 05:59:27,966 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 05:59:27,966 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 05:59:27,967 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 05:59:27,967 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 05:59:28,002 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 05:59:28,014 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 05:59:28,018 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 05:59:28,019 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 05:59:28,020 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 05:59:28,021 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 05:59:28,149 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 05:59:28,154 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 05:59:28,156 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 05:59:28,156 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 05:59:28,164 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 05:59:28,165 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,168 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ca73ec6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28, skipping insertion in model container [2018-01-21 05:59:28,169 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,184 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:59:28,202 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 05:59:28,307 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:59:28,323 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 05:59:28,330 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28 WrapperNode [2018-01-21 05:59:28,330 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 05:59:28,331 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 05:59:28,331 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 05:59:28,331 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 05:59:28,342 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,342 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,350 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,350 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,353 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,355 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,356 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (1/1) ... [2018-01-21 05:59:28,358 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 05:59:28,358 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 05:59:28,358 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 05:59:28,358 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 05:59:28,359 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (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 05:59:28,404 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 05:59:28,404 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 05:59:28,404 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 05:59:28,404 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 05:59:28,405 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 05:59:28,569 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 05:59:28,569 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:59:28 BoogieIcfgContainer [2018-01-21 05:59:28,569 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 05:59:28,570 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 05:59:28,570 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 05:59:28,572 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 05:59:28,572 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 05:59:28" (1/3) ... [2018-01-21 05:59:28,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6862f056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:59:28, skipping insertion in model container [2018-01-21 05:59:28,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 05:59:28" (2/3) ... [2018-01-21 05:59:28,573 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6862f056 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 05:59:28, skipping insertion in model container [2018-01-21 05:59:28,573 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 05:59:28" (3/3) ... [2018-01-21 05:59:28,575 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-read.c [2018-01-21 05:59:28,582 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 05:59:28,588 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 05:59:28,629 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:59:28,630 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:59:28,630 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:59:28,630 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:59:28,630 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:59:28,630 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:59:28,630 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:59:28,631 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 05:59:28,631 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:59:28,652 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 05:59:28,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 05:59:28,659 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:28,660 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 05:59:28,660 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 05:59:28,665 INFO L82 PathProgramCache]: Analyzing trace with hash 102829, now seen corresponding path program 1 times [2018-01-21 05:59:28,668 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:28,720 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:28,720 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:28,721 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:28,721 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:28,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:59:28,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 05:59:28,779 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 05:59:28,786 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 05:59:28,792 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:59:28,792 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:59:28,792 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:59:28,792 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:59:28,792 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:59:28,792 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:59:28,792 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:59:28,792 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 05:59:28,792 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:59:28,794 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 05:59:28,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 05:59:28,795 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:28,795 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:28,795 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 05:59:28,795 INFO L82 PathProgramCache]: Analyzing trace with hash 33657389, now seen corresponding path program 1 times [2018-01-21 05:59:28,795 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:28,796 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:28,796 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:28,796 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:28,797 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:28,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:28,820 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:28,847 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 05:59:28,848 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:59:28,848 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:59:28,848 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:59:28,850 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:59:28,860 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:59:28,860 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:59:28,862 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 05:59:28,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:28,891 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 05:59:28,891 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:59:28,893 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 05:59:28,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:28,901 INFO L225 Difference]: With dead ends: 76 [2018-01-21 05:59:28,902 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 05:59:28,906 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 05:59:28,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 05:59:29,004 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 05:59:29,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 05:59:29,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 05:59:29,007 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 05:59:29,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:29,008 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 05:59:29,008 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:59:29,008 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 05:59:29,008 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 05:59:29,011 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 05:59:29,011 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 05:59:29,011 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 05:59:29,012 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 05:59:29,012 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 05:59:29,012 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 05:59:29,012 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 05:59:29,012 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 05:59:29,012 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 05:59:29,014 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states. [2018-01-21 05:59:29,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 05:59:29,015 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:29,015 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 05:59:29,015 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:29,016 INFO L82 PathProgramCache]: Analyzing trace with hash 1331820257, now seen corresponding path program 1 times [2018-01-21 05:59:29,016 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:29,017 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,017 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:29,017 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,017 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:29,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:29,026 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:29,039 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 05:59:29,039 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:59:29,039 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 05:59:29,039 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:59:29,039 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 05:59:29,040 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 05:59:29,040 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 05:59:29,040 INFO L87 Difference]: Start difference. First operand 43 states. Second operand 2 states. [2018-01-21 05:59:29,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:29,044 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2018-01-21 05:59:29,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 05:59:29,044 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 05:59:29,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:29,047 INFO L225 Difference]: With dead ends: 76 [2018-01-21 05:59:29,047 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 05:59:29,047 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 05:59:29,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 05:59:29,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 05:59:29,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 05:59:29,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 42 transitions. [2018-01-21 05:59:29,059 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 42 transitions. Word has length 17 [2018-01-21 05:59:29,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:29,059 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 42 transitions. [2018-01-21 05:59:29,059 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 05:59:29,059 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 42 transitions. [2018-01-21 05:59:29,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 05:59:29,060 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:29,060 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 05:59:29,060 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:29,060 INFO L82 PathProgramCache]: Analyzing trace with hash -1785977394, now seen corresponding path program 1 times [2018-01-21 05:59:29,060 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:29,061 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,061 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:29,062 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,062 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:29,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:29,075 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:29,116 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 05:59:29,116 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:59:29,116 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 05:59:29,116 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:59:29,118 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 05:59:29,119 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 05:59:29,119 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 05:59:29,119 INFO L87 Difference]: Start difference. First operand 39 states and 42 transitions. Second operand 3 states. [2018-01-21 05:59:29,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:29,154 INFO L93 Difference]: Finished difference Result 58 states and 64 transitions. [2018-01-21 05:59:29,155 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 05:59:29,155 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 05:59:29,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:29,157 INFO L225 Difference]: With dead ends: 58 [2018-01-21 05:59:29,158 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 05:59:29,159 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 05:59:29,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 05:59:29,167 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 38. [2018-01-21 05:59:29,167 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 05:59:29,168 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-01-21 05:59:29,168 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 19 [2018-01-21 05:59:29,168 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:29,169 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-01-21 05:59:29,169 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 05:59:29,169 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-01-21 05:59:29,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 05:59:29,171 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:29,171 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:29,171 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:29,172 INFO L82 PathProgramCache]: Analyzing trace with hash -751966911, now seen corresponding path program 1 times [2018-01-21 05:59:29,172 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:29,173 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,173 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:29,173 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,173 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:29,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:29,194 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:29,365 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 05:59:29,366 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 05:59:29,366 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2018-01-21 05:59:29,366 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:59:29,366 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 05:59:29,367 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 05:59:29,367 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2018-01-21 05:59:29,367 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 6 states. [2018-01-21 05:59:29,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:29,511 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2018-01-21 05:59:29,511 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 05:59:29,511 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 34 [2018-01-21 05:59:29,511 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:29,513 INFO L225 Difference]: With dead ends: 79 [2018-01-21 05:59:29,514 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 05:59:29,514 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2018-01-21 05:59:29,514 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 05:59:29,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-01-21 05:59:29,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 05:59:29,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 48 transitions. [2018-01-21 05:59:29,520 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 48 transitions. Word has length 34 [2018-01-21 05:59:29,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:29,520 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 48 transitions. [2018-01-21 05:59:29,521 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 05:59:29,521 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 48 transitions. [2018-01-21 05:59:29,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 05:59:29,523 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:29,523 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, 1, 1, 1] [2018-01-21 05:59:29,523 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:29,523 INFO L82 PathProgramCache]: Analyzing trace with hash -335791331, now seen corresponding path program 1 times [2018-01-21 05:59:29,523 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:29,524 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,524 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:29,524 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:29,524 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:29,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:29,539 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:29,573 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 05:59:29,573 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:29,574 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:29,575 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 05:59:29,576 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [74], [76], [77], [78], [79], [80], [81] [2018-01-21 05:59:29,619 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 05:59:29,619 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 05:59:31,913 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 05:59:31,914 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 05:59:31,935 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 05:59:31,935 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:31,935 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 05:59:31,947 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:31,947 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 05:59:31,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:31,990 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:32,043 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 05:59:32,044 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:32,135 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 05:59:32,157 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:32,157 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 05:59:32,169 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:32,170 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 05:59:32,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:32,204 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:32,210 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 05:59:32,210 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:32,246 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 05:59:32,248 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:32,248 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 05:59:32,248 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:32,249 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 05:59:32,249 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 05:59:32,249 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 05:59:32,249 INFO L87 Difference]: Start difference. First operand 44 states and 48 transitions. Second operand 5 states. [2018-01-21 05:59:32,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:32,303 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-01-21 05:59:32,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 05:59:32,303 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 05:59:32,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:32,304 INFO L225 Difference]: With dead ends: 67 [2018-01-21 05:59:32,305 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 05:59:32,305 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 05:59:32,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 05:59:32,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 50. [2018-01-21 05:59:32,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 05:59:32,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2018-01-21 05:59:32,314 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 39 [2018-01-21 05:59:32,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:32,314 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2018-01-21 05:59:32,314 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 05:59:32,314 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2018-01-21 05:59:32,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 05:59:32,316 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:32,316 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:32,316 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:32,317 INFO L82 PathProgramCache]: Analyzing trace with hash -291520001, now seen corresponding path program 2 times [2018-01-21 05:59:32,317 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:32,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:32,318 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:32,318 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:32,318 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:32,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:32,338 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:32,404 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 05:59:32,404 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:32,404 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:32,405 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:32,405 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:32,405 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:32,405 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 05:59:32,413 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 05:59:32,414 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:32,429 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:32,442 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:32,444 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:32,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:32,495 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 05:59:32,495 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:32,639 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 18 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 05:59:32,661 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 05:59:32,661 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 11 [2018-01-21 05:59:32,661 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 05:59:32,662 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 05:59:32,662 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 05:59:32,662 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 05:59:32,663 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand 6 states. [2018-01-21 05:59:32,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:32,764 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 05:59:32,765 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 05:59:32,765 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 05:59:32,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:32,766 INFO L225 Difference]: With dead ends: 86 [2018-01-21 05:59:32,766 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 05:59:32,767 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=98, Unknown=0, NotChecked=0, Total=132 [2018-01-21 05:59:32,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 05:59:32,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 47. [2018-01-21 05:59:32,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 05:59:32,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2018-01-21 05:59:32,773 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 52 [2018-01-21 05:59:32,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:32,774 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2018-01-21 05:59:32,774 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 05:59:32,774 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2018-01-21 05:59:32,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 05:59:32,776 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:32,776 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:32,776 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:32,776 INFO L82 PathProgramCache]: Analyzing trace with hash -41114337, now seen corresponding path program 3 times [2018-01-21 05:59:32,776 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:32,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:32,777 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:32,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:32,778 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:32,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:32,796 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:32,840 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 05:59:32,840 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:32,840 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:32,840 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:32,841 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:32,841 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:32,841 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:32,847 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 05:59:32,847 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 05:59:32,858 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:32,873 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:32,890 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:32,891 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:32,894 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:32,960 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 05:59:32,961 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:33,127 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 05:59:33,148 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:33,148 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:33,151 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 05:59:33,151 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 05:59:33,164 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:33,174 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:33,190 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:33,199 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:33,205 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:33,215 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 05:59:33,215 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:33,256 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 05:59:33,258 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:33,258 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 15 [2018-01-21 05:59:33,258 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:33,259 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 05:59:33,259 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 05:59:33,259 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2018-01-21 05:59:33,259 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 9 states. [2018-01-21 05:59:33,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:33,365 INFO L93 Difference]: Finished difference Result 107 states and 119 transitions. [2018-01-21 05:59:33,365 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 05:59:33,366 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 57 [2018-01-21 05:59:33,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:33,368 INFO L225 Difference]: With dead ends: 107 [2018-01-21 05:59:33,368 INFO L226 Difference]: Without dead ends: 95 [2018-01-21 05:59:33,368 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=75, Invalid=197, Unknown=0, NotChecked=0, Total=272 [2018-01-21 05:59:33,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-01-21 05:59:33,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 78. [2018-01-21 05:59:33,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-01-21 05:59:33,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 86 transitions. [2018-01-21 05:59:33,379 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 86 transitions. Word has length 57 [2018-01-21 05:59:33,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:33,380 INFO L432 AbstractCegarLoop]: Abstraction has 78 states and 86 transitions. [2018-01-21 05:59:33,380 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 05:59:33,380 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 86 transitions. [2018-01-21 05:59:33,382 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 05:59:33,382 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:33,383 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 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, 1] [2018-01-21 05:59:33,383 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:33,383 INFO L82 PathProgramCache]: Analyzing trace with hash 1962089693, now seen corresponding path program 4 times [2018-01-21 05:59:33,383 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:33,384 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:33,384 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:33,384 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:33,385 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:33,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:33,409 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:33,519 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 05:59:33,519 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:33,519 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:33,519 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:33,519 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:33,520 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:33,520 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:33,529 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 05:59:33,529 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 05:59:33,554 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:33,558 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:33,666 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 05:59:33,666 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:33,881 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 05:59:33,902 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:33,902 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:33,908 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 05:59:33,909 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 05:59:33,960 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:33,966 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:33,984 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 05:59:33,985 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:34,078 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 81 proven. 9 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 05:59:34,080 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:34,080 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9, 9, 9] total 16 [2018-01-21 05:59:34,080 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:34,080 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 05:59:34,081 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 05:59:34,081 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2018-01-21 05:59:34,081 INFO L87 Difference]: Start difference. First operand 78 states and 86 transitions. Second operand 13 states. [2018-01-21 05:59:34,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:34,242 INFO L93 Difference]: Finished difference Result 200 states and 228 transitions. [2018-01-21 05:59:34,242 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 05:59:34,243 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 85 [2018-01-21 05:59:34,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:34,245 INFO L225 Difference]: With dead ends: 200 [2018-01-21 05:59:34,245 INFO L226 Difference]: Without dead ends: 149 [2018-01-21 05:59:34,246 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 320 SyntacticMatches, 10 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 133 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=102, Invalid=360, Unknown=0, NotChecked=0, Total=462 [2018-01-21 05:59:34,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 149 states. [2018-01-21 05:59:34,258 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 149 to 106. [2018-01-21 05:59:34,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-01-21 05:59:34,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-01-21 05:59:34,260 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 85 [2018-01-21 05:59:34,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:34,261 INFO L432 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-01-21 05:59:34,261 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 05:59:34,261 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-01-21 05:59:34,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-01-21 05:59:34,263 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:34,264 INFO L322 BasicCegarLoop]: trace histogram [12, 8, 8, 8, 8, 5, 4, 4, 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, 1] [2018-01-21 05:59:34,264 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:34,264 INFO L82 PathProgramCache]: Analyzing trace with hash -1278120925, now seen corresponding path program 5 times [2018-01-21 05:59:34,264 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:34,265 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:34,265 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:34,265 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:34,265 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:34,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:34,291 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:34,420 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2018-01-21 05:59:34,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:34,420 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:34,420 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:34,420 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:34,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:34,421 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:34,432 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 05:59:34,432 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:34,444 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,451 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,458 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,460 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:34,464 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:34,546 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 05:59:34,547 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:34,738 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 05:59:34,760 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:34,760 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:34,769 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 05:59:34,769 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:34,779 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,788 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,807 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:34,817 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:34,823 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:34,855 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 147 proven. 18 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2018-01-21 05:59:34,855 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:35,145 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 33 proven. 128 refuted. 0 times theorem prover too weak. 129 trivial. 0 not checked. [2018-01-21 05:59:35,147 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:35,147 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 05:59:35,147 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:35,148 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 05:59:35,148 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 05:59:35,148 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=220, Unknown=0, NotChecked=0, Total=272 [2018-01-21 05:59:35,148 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 14 states. [2018-01-21 05:59:35,361 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:35,361 INFO L93 Difference]: Finished difference Result 180 states and 196 transitions. [2018-01-21 05:59:35,361 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 05:59:35,361 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 113 [2018-01-21 05:59:35,362 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:35,362 INFO L225 Difference]: With dead ends: 180 [2018-01-21 05:59:35,362 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 05:59:35,363 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 434 SyntacticMatches, 12 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=560, Unknown=0, NotChecked=0, Total=702 [2018-01-21 05:59:35,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 05:59:35,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 105. [2018-01-21 05:59:35,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-01-21 05:59:35,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 114 transitions. [2018-01-21 05:59:35,371 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 114 transitions. Word has length 113 [2018-01-21 05:59:35,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:35,371 INFO L432 AbstractCegarLoop]: Abstraction has 105 states and 114 transitions. [2018-01-21 05:59:35,371 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 05:59:35,371 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 114 transitions. [2018-01-21 05:59:35,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 05:59:35,373 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:35,373 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:35,373 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:35,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1614733819, now seen corresponding path program 6 times [2018-01-21 05:59:35,374 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:35,374 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:35,374 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:35,374 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:35,375 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:35,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:35,402 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:35,544 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 05:59:35,545 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:35,545 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:35,545 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:35,545 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:35,545 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:35,545 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:35,550 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 05:59:35,551 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 05:59:35,565 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,577 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,581 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,584 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,588 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,593 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,605 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,618 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:35,624 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:35,694 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 05:59:35,694 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:35,891 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 179 proven. 89 refuted. 0 times theorem prover too weak. 322 trivial. 0 not checked. [2018-01-21 05:59:35,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:35,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:35,926 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 05:59:35,926 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 05:59:35,945 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,958 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,978 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:35,998 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:36,026 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:36,067 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:36,193 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:36,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:37,730 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:37,771 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:37,778 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:37,811 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 05:59:37,811 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:37,898 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 05:59:37,900 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:37,900 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 10, 10, 8, 8] total 25 [2018-01-21 05:59:37,901 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:37,901 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 05:59:37,901 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 05:59:37,902 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=162, Invalid=438, Unknown=0, NotChecked=0, Total=600 [2018-01-21 05:59:37,902 INFO L87 Difference]: Start difference. First operand 105 states and 114 transitions. Second operand 13 states. [2018-01-21 05:59:38,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:38,070 INFO L93 Difference]: Finished difference Result 234 states and 263 transitions. [2018-01-21 05:59:38,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 05:59:38,070 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 146 [2018-01-21 05:59:38,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:38,073 INFO L225 Difference]: With dead ends: 234 [2018-01-21 05:59:38,073 INFO L226 Difference]: Without dead ends: 222 [2018-01-21 05:59:38,074 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 566 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=210, Invalid=602, Unknown=0, NotChecked=0, Total=812 [2018-01-21 05:59:38,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 222 states. [2018-01-21 05:59:38,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 222 to 146. [2018-01-21 05:59:38,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 146 states. [2018-01-21 05:59:38,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 163 transitions. [2018-01-21 05:59:38,089 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 163 transitions. Word has length 146 [2018-01-21 05:59:38,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:38,090 INFO L432 AbstractCegarLoop]: Abstraction has 146 states and 163 transitions. [2018-01-21 05:59:38,090 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 05:59:38,090 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 163 transitions. [2018-01-21 05:59:38,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 05:59:38,092 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:38,092 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:38,092 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:38,092 INFO L82 PathProgramCache]: Analyzing trace with hash 1755240795, now seen corresponding path program 7 times [2018-01-21 05:59:38,093 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:38,093 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:38,093 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:38,093 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:38,093 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:38,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:38,123 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:38,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 05:59:38,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:38,234 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:38,234 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:38,234 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:38,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:38,234 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:38,240 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:38,240 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 05:59:38,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:38,280 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:38,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 05:59:38,377 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:38,587 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 05:59:38,608 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:38,608 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:38,611 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:38,611 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 05:59:38,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:38,704 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:38,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 761 proven. 38 refuted. 0 times theorem prover too weak. 389 trivial. 0 not checked. [2018-01-21 05:59:38,729 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:38,859 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 383 proven. 139 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2018-01-21 05:59:38,861 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:38,861 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13, 13, 13, 13] total 25 [2018-01-21 05:59:38,861 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:38,862 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 05:59:38,862 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 05:59:38,862 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2018-01-21 05:59:38,863 INFO L87 Difference]: Start difference. First operand 146 states and 163 transitions. Second operand 20 states. [2018-01-21 05:59:39,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:39,152 INFO L93 Difference]: Finished difference Result 370 states and 422 transitions. [2018-01-21 05:59:39,152 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 05:59:39,152 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 189 [2018-01-21 05:59:39,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:39,154 INFO L225 Difference]: With dead ends: 370 [2018-01-21 05:59:39,154 INFO L226 Difference]: Without dead ends: 296 [2018-01-21 05:59:39,155 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 774 GetRequests, 726 SyntacticMatches, 14 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 402 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=244, Invalid=1016, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 05:59:39,155 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 296 states. [2018-01-21 05:59:39,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 296 to 184. [2018-01-21 05:59:39,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-01-21 05:59:39,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 204 transitions. [2018-01-21 05:59:39,170 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 204 transitions. Word has length 189 [2018-01-21 05:59:39,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:39,170 INFO L432 AbstractCegarLoop]: Abstraction has 184 states and 204 transitions. [2018-01-21 05:59:39,170 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 05:59:39,170 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 204 transitions. [2018-01-21 05:59:39,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 233 [2018-01-21 05:59:39,172 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:39,172 INFO L322 BasicCegarLoop]: trace histogram [31, 24, 24, 24, 24, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:39,173 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:39,173 INFO L82 PathProgramCache]: Analyzing trace with hash 519411977, now seen corresponding path program 8 times [2018-01-21 05:59:39,173 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:39,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:39,174 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 05:59:39,174 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:39,174 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:39,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:39,202 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:39,329 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1842 trivial. 0 not checked. [2018-01-21 05:59:39,329 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:39,329 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:39,329 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:39,330 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:39,330 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:39,330 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:39,335 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 05:59:39,335 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:39,350 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:39,377 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:39,382 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:39,386 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:39,488 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 05:59:39,488 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:39,668 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 05:59:39,688 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:39,689 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:39,694 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 05:59:39,695 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:39,715 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:39,761 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:39,796 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:39,806 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:39,860 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 1178 proven. 21 refuted. 0 times theorem prover too weak. 804 trivial. 0 not checked. [2018-01-21 05:59:39,860 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:40,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2003 backedges. 257 proven. 309 refuted. 0 times theorem prover too weak. 1437 trivial. 0 not checked. [2018-01-21 05:59:40,030 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:40,030 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11, 11, 11] total 23 [2018-01-21 05:59:40,030 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:40,030 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 05:59:40,030 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 05:59:40,031 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=402, Unknown=0, NotChecked=0, Total=506 [2018-01-21 05:59:40,031 INFO L87 Difference]: Start difference. First operand 184 states and 204 transitions. Second operand 19 states. [2018-01-21 05:59:40,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:40,264 INFO L93 Difference]: Finished difference Result 330 states and 362 transitions. [2018-01-21 05:59:40,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 05:59:40,264 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 232 [2018-01-21 05:59:40,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:40,265 INFO L225 Difference]: With dead ends: 330 [2018-01-21 05:59:40,265 INFO L226 Difference]: Without dead ends: 248 [2018-01-21 05:59:40,266 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 947 GetRequests, 903 SyntacticMatches, 12 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 338 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=225, Invalid=897, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 05:59:40,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 248 states. [2018-01-21 05:59:40,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 248 to 183. [2018-01-21 05:59:40,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2018-01-21 05:59:40,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 202 transitions. [2018-01-21 05:59:40,279 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 202 transitions. Word has length 232 [2018-01-21 05:59:40,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:40,279 INFO L432 AbstractCegarLoop]: Abstraction has 183 states and 202 transitions. [2018-01-21 05:59:40,279 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 05:59:40,280 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 202 transitions. [2018-01-21 05:59:40,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 05:59:40,284 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:40,284 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:40,284 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:40,284 INFO L82 PathProgramCache]: Analyzing trace with hash -881233501, now seen corresponding path program 9 times [2018-01-21 05:59:40,284 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:40,285 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:40,285 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:40,285 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:40,286 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:40,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:40,322 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:40,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 05:59:40,593 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:40,593 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:40,593 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:40,593 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:40,593 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:40,593 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:40,598 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 05:59:40,598 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 05:59:40,614 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,621 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,625 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,632 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,638 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,644 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:40,645 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:40,649 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:40,757 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 05:59:40,757 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:41,025 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 05:59:41,046 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:41,046 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:41,055 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 05:59:41,055 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 05:59:41,081 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,090 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,103 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,124 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,159 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,532 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 05:59:41,557 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:41,565 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:41,617 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 05:59:41,617 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:41,907 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 824 proven. 60 refuted. 0 times theorem prover too weak. 2151 trivial. 0 not checked. [2018-01-21 05:59:41,909 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:41,909 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 27 [2018-01-21 05:59:41,909 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:41,910 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 05:59:41,910 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 05:59:41,910 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=517, Unknown=0, NotChecked=0, Total=702 [2018-01-21 05:59:41,911 INFO L87 Difference]: Start difference. First operand 183 states and 202 transitions. Second operand 18 states. [2018-01-21 05:59:42,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:42,220 INFO L93 Difference]: Finished difference Result 420 states and 476 transitions. [2018-01-21 05:59:42,257 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 05:59:42,257 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 275 [2018-01-21 05:59:42,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:42,261 INFO L225 Difference]: With dead ends: 420 [2018-01-21 05:59:42,261 INFO L226 Difference]: Without dead ends: 408 [2018-01-21 05:59:42,262 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1115 GetRequests, 1082 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 174 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=281, Invalid=775, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 05:59:42,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 408 states. [2018-01-21 05:59:42,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 408 to 234. [2018-01-21 05:59:42,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 234 states. [2018-01-21 05:59:42,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 234 states to 234 states and 264 transitions. [2018-01-21 05:59:42,279 INFO L78 Accepts]: Start accepts. Automaton has 234 states and 264 transitions. Word has length 275 [2018-01-21 05:59:42,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:42,280 INFO L432 AbstractCegarLoop]: Abstraction has 234 states and 264 transitions. [2018-01-21 05:59:42,280 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 05:59:42,280 INFO L276 IsEmpty]: Start isEmpty. Operand 234 states and 264 transitions. [2018-01-21 05:59:42,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 05:59:42,282 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:42,282 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:42,282 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:42,282 INFO L82 PathProgramCache]: Analyzing trace with hash 2119777693, now seen corresponding path program 10 times [2018-01-21 05:59:42,282 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:42,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:42,283 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:42,283 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:42,283 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:42,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:42,324 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:42,670 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 05:59:42,670 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:42,670 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:42,671 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:42,671 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:42,671 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:42,671 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:42,679 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 05:59:42,679 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 05:59:42,769 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:42,777 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:43,027 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 05:59:43,027 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:43,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 05:59:43,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:43,556 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:43,559 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 05:59:43,559 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 05:59:43,692 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:43,703 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:43,773 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 3005 proven. 87 refuted. 0 times theorem prover too weak. 1801 trivial. 0 not checked. [2018-01-21 05:59:43,773 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:44,066 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1025 proven. 505 refuted. 0 times theorem prover too weak. 3363 trivial. 0 not checked. [2018-01-21 05:59:44,068 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:44,068 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17, 17, 17, 17] total 34 [2018-01-21 05:59:44,068 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:44,069 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 05:59:44,069 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 05:59:44,069 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=209, Invalid=913, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 05:59:44,069 INFO L87 Difference]: Start difference. First operand 234 states and 264 transitions. Second operand 27 states. [2018-01-21 05:59:44,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:44,494 INFO L93 Difference]: Finished difference Result 592 states and 676 transitions. [2018-01-21 05:59:44,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 05:59:44,494 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 333 [2018-01-21 05:59:44,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:44,497 INFO L225 Difference]: With dead ends: 592 [2018-01-21 05:59:44,497 INFO L226 Difference]: Without dead ends: 495 [2018-01-21 05:59:44,498 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1358 GetRequests, 1292 SyntacticMatches, 18 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 812 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=445, Invalid=2005, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 05:59:44,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 495 states. [2018-01-21 05:59:44,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 495 to 282. [2018-01-21 05:59:44,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-01-21 05:59:44,515 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-01-21 05:59:44,515 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 333 [2018-01-21 05:59:44,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:44,516 INFO L432 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-01-21 05:59:44,516 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 05:59:44,516 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-01-21 05:59:44,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 392 [2018-01-21 05:59:44,517 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:44,518 INFO L322 BasicCegarLoop]: trace histogram [58, 48, 48, 48, 48, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:44,518 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:44,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1106394585, now seen corresponding path program 11 times [2018-01-21 05:59:44,518 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:44,519 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:44,519 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:44,519 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:44,519 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:44,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:44,551 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:44,836 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 6870 trivial. 0 not checked. [2018-01-21 05:59:44,836 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:44,836 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:44,836 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:44,836 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:44,836 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:44,836 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:44,841 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 05:59:44,841 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:44,871 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,887 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,904 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,921 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,928 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,935 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,942 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:44,944 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:44,948 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:45,199 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 05:59:45,200 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:45,644 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 05:59:45,665 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:45,665 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:45,667 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 05:59:45,668 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 05:59:45,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:45,702 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:45,720 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:45,757 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:45,803 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:46,332 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:46,500 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 05:59:46,535 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:46,547 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:46,626 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 4140 proven. 307 refuted. 0 times theorem prover too weak. 2758 trivial. 0 not checked. [2018-01-21 05:59:46,626 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:46,913 INFO L134 CoverageAnalysis]: Checked inductivity of 7205 backedges. 707 proven. 1488 refuted. 0 times theorem prover too weak. 5010 trivial. 0 not checked. [2018-01-21 05:59:46,915 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 05:59:46,916 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 17, 17, 17, 17] total 36 [2018-01-21 05:59:46,916 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 05:59:46,917 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 05:59:46,917 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 05:59:46,917 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=1062, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 05:59:46,917 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 28 states. [2018-01-21 05:59:47,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 05:59:47,739 INFO L93 Difference]: Finished difference Result 640 states and 719 transitions. [2018-01-21 05:59:47,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 05:59:47,740 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 391 [2018-01-21 05:59:47,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 05:59:47,742 INFO L225 Difference]: With dead ends: 640 [2018-01-21 05:59:47,742 INFO L226 Difference]: Without dead ends: 345 [2018-01-21 05:59:47,743 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1601 GetRequests, 1523 SyntacticMatches, 18 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1060 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=623, Invalid=3159, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 05:59:47,743 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2018-01-21 05:59:47,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 281. [2018-01-21 05:59:47,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 281 states. [2018-01-21 05:59:47,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 281 states to 281 states and 307 transitions. [2018-01-21 05:59:47,761 INFO L78 Accepts]: Start accepts. Automaton has 281 states and 307 transitions. Word has length 391 [2018-01-21 05:59:47,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 05:59:47,762 INFO L432 AbstractCegarLoop]: Abstraction has 281 states and 307 transitions. [2018-01-21 05:59:47,762 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 05:59:47,762 INFO L276 IsEmpty]: Start isEmpty. Operand 281 states and 307 transitions. [2018-01-21 05:59:47,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2018-01-21 05:59:47,765 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 05:59:47,766 INFO L322 BasicCegarLoop]: trace histogram [67, 56, 56, 56, 56, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 05:59:47,766 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 05:59:47,766 INFO L82 PathProgramCache]: Analyzing trace with hash -785380599, now seen corresponding path program 12 times [2018-01-21 05:59:47,766 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 05:59:47,767 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:47,767 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 05:59:47,767 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 05:59:47,768 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 05:59:47,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 05:59:47,816 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 05:59:48,347 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 9262 trivial. 0 not checked. [2018-01-21 05:59:48,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:48,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 05:59:48,348 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 05:59:48,348 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 05:59:48,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:48,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 05:59:48,355 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 05:59:48,356 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 05:59:48,386 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,391 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,394 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,399 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,404 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,411 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,419 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,436 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,451 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,476 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,518 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,532 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,561 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,578 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,629 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,666 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,717 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:48,719 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 05:59:48,725 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 05:59:48,887 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 05:59:48,888 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 05:59:49,398 INFO L134 CoverageAnalysis]: Checked inductivity of 9669 backedges. 2065 proven. 119 refuted. 0 times theorem prover too weak. 7485 trivial. 0 not checked. [2018-01-21 05:59:49,419 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 05:59:49,419 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 05:59:49,422 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 05:59:49,422 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 05:59:49,453 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:49,464 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:49,488 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:49,524 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:49,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:55,812 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 05:59:57,202 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:02,610 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,658 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:26,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown