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_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memset3_true-valid-memsafety_true-termination.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:49:50,892 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:49:50,894 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:49:50,909 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:49:50,910 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:49:50,911 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:49:50,912 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:49:50,913 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:49:50,915 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:49:50,916 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:49:50,917 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:49:50,917 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:49:50,918 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:49:50,919 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:49:50,920 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:49:50,923 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:49:50,925 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:49:50,927 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:49:50,929 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:49:50,930 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:49:50,932 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 08:49:50,932 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 08:49:50,933 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 08:49:50,934 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 08:49:50,934 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 08:49:50,936 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 08:49:50,936 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 08:49:50,936 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 08:49:50,937 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 08:49:50,937 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:49:50,937 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:49:50,938 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_preciseopt.epf [2018-01-21 08:49:50,946 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:49:50,946 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:49:50,947 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:49:50,947 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:49:50,947 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:49:50,947 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:49:50,947 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:49:50,948 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:49:50,948 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:49:50,948 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:49:50,948 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:49:50,948 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:49:50,949 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:49:50,950 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:49:50,950 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:49:50,950 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:49:50,950 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:49:50,950 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:49:50,950 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:49:50,951 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:49:50,951 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:49:50,952 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:49:50,953 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:49:50,953 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:49:50,987 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:49:51,000 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:49:51,003 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:49:51,005 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:49:51,005 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:49:51,006 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memset3_true-valid-memsafety_true-termination.c [2018-01-21 08:49:51,105 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:49:51,110 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:49:51,110 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:49:51,111 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:49:51,116 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:49:51,117 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,119 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2c111afb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51, skipping insertion in model container [2018-01-21 08:49:51,120 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,133 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:49:51,148 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:49:51,258 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:49:51,273 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:49:51,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51 WrapperNode [2018-01-21 08:49:51,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:49:51,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:49:51,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:49:51,279 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:49:51,291 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,292 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,300 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,300 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,303 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,306 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,307 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (1/1) ... [2018-01-21 08:49:51,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:49:51,309 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:49:51,309 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:49:51,309 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:49:51,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (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 08:49:51,360 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:49:51,360 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:49:51,360 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:49:51,360 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:49:51,360 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-21 08:49:51,361 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:49:51,361 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:49:51,491 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:49:51,492 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:49:51 BoogieIcfgContainer [2018-01-21 08:49:51,492 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:49:51,493 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:49:51,493 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:49:51,495 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:49:51,495 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:49:51" (1/3) ... [2018-01-21 08:49:51,496 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140fe26b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:49:51, skipping insertion in model container [2018-01-21 08:49:51,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:49:51" (2/3) ... [2018-01-21 08:49:51,496 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@140fe26b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:49:51, skipping insertion in model container [2018-01-21 08:49:51,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:49:51" (3/3) ... [2018-01-21 08:49:51,498 INFO L105 eAbstractionObserver]: Analyzing ICFG memset3_true-valid-memsafety_true-termination.c [2018-01-21 08:49:51,508 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:49:51,516 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 08:49:51,561 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:49:51,561 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:49:51,561 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:49:51,562 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:49:51,562 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:49:51,562 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:49:51,562 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:49:51,562 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:49:51,563 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:49:51,583 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 08:49:51,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:49:51,589 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:51,590 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:49:51,591 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:49:51,596 INFO L82 PathProgramCache]: Analyzing trace with hash 51896, now seen corresponding path program 1 times [2018-01-21 08:49:51,598 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:51,645 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:51,645 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:51,646 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:51,646 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:51,673 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:49:51,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:49:51,696 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:49:51,702 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:49:51,709 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:49:51,709 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:49:51,709 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:49:51,709 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:49:51,709 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:49:51,709 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:49:51,709 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:49:51,710 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:49:51,710 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:49:51,711 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 08:49:51,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 08:49:51,711 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:51,711 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:51,712 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:51,712 INFO L82 PathProgramCache]: Analyzing trace with hash 126067280, now seen corresponding path program 1 times [2018-01-21 08:49:51,712 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:51,713 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:51,713 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:51,713 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:51,713 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:51,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:51,744 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:51,837 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 08:49:51,838 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:49:51,839 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 08:49:51,839 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:49:51,841 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 08:49:51,857 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 08:49:51,858 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 08:49:51,861 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2018-01-21 08:49:51,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:51,918 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 08:49:51,918 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 08:49:51,919 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-01-21 08:49:51,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:51,927 INFO L225 Difference]: With dead ends: 34 [2018-01-21 08:49:51,927 INFO L226 Difference]: Without dead ends: 20 [2018-01-21 08:49:51,988 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 08:49:52,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-21 08:49:52,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-21 08:49:52,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-21 08:49:52,018 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-21 08:49:52,020 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-21 08:49:52,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:52,020 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-21 08:49:52,020 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 08:49:52,020 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-21 08:49:52,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:49:52,021 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:52,021 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 08:49:52,021 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:52,021 INFO L82 PathProgramCache]: Analyzing trace with hash 763300235, now seen corresponding path program 1 times [2018-01-21 08:49:52,021 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:52,023 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:52,023 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:52,023 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:52,023 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:52,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:52,040 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:52,110 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:52,111 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:52,126 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:52,127 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-01-21 08:49:52,129 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [16], [18], [19], [20], [21], [23], [24], [25], [26], [27], [28] [2018-01-21 08:49:52,171 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:49:52,171 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:49:52,965 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:49:52,966 INFO L268 AbstractInterpreter]: Visited 19 different actions 23 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-21 08:49:52,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:49:52,977 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:52,977 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 08:49:52,993 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:52,993 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:53,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:53,027 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:53,076 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,076 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:53,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,255 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:53,255 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 08:49:53,262 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:53,262 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:53,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:53,296 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:53,301 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,301 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:53,396 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,398 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:53,398 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 11 [2018-01-21 08:49:53,398 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:53,399 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 08:49:53,399 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 08:49:53,400 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:49:53,400 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 8 states. [2018-01-21 08:49:53,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:53,427 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-21 08:49:53,427 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:49:53,427 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2018-01-21 08:49:53,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:53,428 INFO L225 Difference]: With dead ends: 30 [2018-01-21 08:49:53,428 INFO L226 Difference]: Without dead ends: 21 [2018-01-21 08:49:53,429 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 68 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=51, Invalid=81, Unknown=0, NotChecked=0, Total=132 [2018-01-21 08:49:53,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-21 08:49:53,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-21 08:49:53,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-21 08:49:53,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-21 08:49:53,434 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-21 08:49:53,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:53,434 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-21 08:49:53,434 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 08:49:53,435 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-21 08:49:53,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 08:49:53,435 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:53,436 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:53,436 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:53,436 INFO L82 PathProgramCache]: Analyzing trace with hash -957314640, now seen corresponding path program 2 times [2018-01-21 08:49:53,436 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:53,437 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:53,438 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:53,438 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:53,438 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:53,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:53,453 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:53,555 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:53,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:53,556 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:53,556 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:53,556 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:53,556 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 08:49:53,562 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:53,562 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:53,576 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:53,578 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:53,580 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:53,582 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:53,653 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,653 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:53,810 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,832 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:53,832 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:53,838 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:53,838 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:53,855 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:53,867 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:53,876 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:53,879 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:53,883 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,883 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:53,955 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:53,958 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:53,958 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 14 [2018-01-21 08:49:53,958 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:53,959 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:49:53,959 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:49:53,959 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=113, Unknown=0, NotChecked=0, Total=182 [2018-01-21 08:49:53,959 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 10 states. [2018-01-21 08:49:53,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:53,995 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-21 08:49:53,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:49:53,995 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 20 [2018-01-21 08:49:53,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:53,996 INFO L225 Difference]: With dead ends: 31 [2018-01-21 08:49:53,996 INFO L226 Difference]: Without dead ends: 22 [2018-01-21 08:49:53,997 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=80, Invalid=130, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:49:53,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-21 08:49:54,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-21 08:49:54,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-21 08:49:54,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-21 08:49:54,001 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-21 08:49:54,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:54,001 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-21 08:49:54,002 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:49:54,002 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-21 08:49:54,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 08:49:54,002 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:54,002 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:54,003 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:54,003 INFO L82 PathProgramCache]: Analyzing trace with hash 1538199083, now seen corresponding path program 3 times [2018-01-21 08:49:54,003 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:54,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,004 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:54,004 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,004 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:54,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:54,019 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:54,077 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,078 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,078 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:54,078 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:54,078 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:54,078 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,078 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:54,084 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:54,085 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:54,093 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,095 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,096 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,097 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:54,098 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:54,140 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,140 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:54,256 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,277 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,277 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:54,280 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:54,280 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:54,295 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,301 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,309 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:54,315 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:54,318 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:54,321 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,322 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:54,373 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,376 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:54,377 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 17 [2018-01-21 08:49:54,377 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:54,377 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 08:49:54,378 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 08:49:54,378 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=102, Invalid=170, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:49:54,378 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 12 states. [2018-01-21 08:49:54,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:54,425 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-21 08:49:54,426 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 08:49:54,426 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 21 [2018-01-21 08:49:54,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:54,427 INFO L225 Difference]: With dead ends: 32 [2018-01-21 08:49:54,427 INFO L226 Difference]: Without dead ends: 23 [2018-01-21 08:49:54,427 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=115, Invalid=191, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:49:54,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-21 08:49:54,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-21 08:49:54,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-21 08:49:54,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-21 08:49:54,431 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-21 08:49:54,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:54,431 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-21 08:49:54,432 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 08:49:54,432 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-21 08:49:54,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 08:49:54,432 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:54,433 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:54,433 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:54,433 INFO L82 PathProgramCache]: Analyzing trace with hash 1589713168, now seen corresponding path program 4 times [2018-01-21 08:49:54,433 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:54,434 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,434 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:54,434 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,434 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:54,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:54,448 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:54,503 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,503 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,503 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:54,504 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:54,504 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:54,504 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,504 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:54,509 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:54,509 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:54,519 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:54,521 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:54,553 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,553 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:54,657 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,678 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,678 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:54,681 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:54,681 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:54,703 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:54,707 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:54,712 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,713 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:54,777 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,778 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:54,778 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 20 [2018-01-21 08:49:54,778 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:54,779 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 08:49:54,779 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 08:49:54,779 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=239, Unknown=0, NotChecked=0, Total=380 [2018-01-21 08:49:54,779 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 14 states. [2018-01-21 08:49:54,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:54,818 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 08:49:54,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:49:54,819 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 22 [2018-01-21 08:49:54,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:54,819 INFO L225 Difference]: With dead ends: 33 [2018-01-21 08:49:54,820 INFO L226 Difference]: Without dead ends: 24 [2018-01-21 08:49:54,820 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 74 SyntacticMatches, 2 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=156, Invalid=264, Unknown=0, NotChecked=0, Total=420 [2018-01-21 08:49:54,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-21 08:49:54,823 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-21 08:49:54,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-21 08:49:54,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-21 08:49:54,824 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-21 08:49:54,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:54,825 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-21 08:49:54,825 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 08:49:54,825 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-21 08:49:54,826 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 08:49:54,826 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:54,826 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:54,826 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:54,826 INFO L82 PathProgramCache]: Analyzing trace with hash -1108317493, now seen corresponding path program 5 times [2018-01-21 08:49:54,826 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:54,827 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,827 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:54,827 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:54,827 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:54,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:54,840 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:54,964 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:54,964 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:54,965 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:54,965 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:54,965 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:54,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:54,970 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:54,971 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:54,975 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:54,978 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:54,980 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:54,987 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:54,988 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:54,990 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:55,035 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,035 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:55,152 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,172 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:55,173 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:55,175 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:55,175 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:55,180 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:55,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:55,187 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:55,197 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:55,204 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:55,208 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:55,213 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,213 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:55,265 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,266 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:55,266 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 23 [2018-01-21 08:49:55,266 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:55,267 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 08:49:55,267 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 08:49:55,267 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=320, Unknown=0, NotChecked=0, Total=506 [2018-01-21 08:49:55,267 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 16 states. [2018-01-21 08:49:55,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:55,297 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 08:49:55,297 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 08:49:55,297 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 23 [2018-01-21 08:49:55,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:55,298 INFO L225 Difference]: With dead ends: 34 [2018-01-21 08:49:55,298 INFO L226 Difference]: Without dead ends: 25 [2018-01-21 08:49:55,298 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 173 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2018-01-21 08:49:55,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-21 08:49:55,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-21 08:49:55,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-21 08:49:55,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-21 08:49:55,301 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-21 08:49:55,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:55,302 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-21 08:49:55,302 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 08:49:55,302 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-21 08:49:55,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 08:49:55,302 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:55,302 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:55,302 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:55,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1152077936, now seen corresponding path program 6 times [2018-01-21 08:49:55,303 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:55,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:55,303 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:55,304 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:55,304 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:55,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:55,314 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:55,400 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,401 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:55,401 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:55,401 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:55,401 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:55,401 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:55,401 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:55,406 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:55,406 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:55,413 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,415 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,416 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,418 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,418 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:55,420 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:55,473 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,473 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:55,619 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,639 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:55,639 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:55,642 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:55,642 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:55,654 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,665 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,677 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,690 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:55,699 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:55,703 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:55,709 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,709 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:55,768 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:55,770 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:55,770 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 26 [2018-01-21 08:49:55,770 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:55,771 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 08:49:55,771 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 08:49:55,771 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=413, Unknown=0, NotChecked=0, Total=650 [2018-01-21 08:49:55,771 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 18 states. [2018-01-21 08:49:55,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:55,831 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-21 08:49:55,831 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 08:49:55,831 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 24 [2018-01-21 08:49:55,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:55,832 INFO L225 Difference]: With dead ends: 35 [2018-01-21 08:49:55,832 INFO L226 Difference]: Without dead ends: 26 [2018-01-21 08:49:55,833 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 78 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 232 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=256, Invalid=446, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:49:55,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-21 08:49:55,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-21 08:49:55,836 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-21 08:49:55,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-21 08:49:55,837 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-21 08:49:55,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:55,837 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-21 08:49:55,837 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 08:49:55,837 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-21 08:49:55,838 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 08:49:55,838 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:55,838 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:55,838 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:55,839 INFO L82 PathProgramCache]: Analyzing trace with hash -1790107797, now seen corresponding path program 7 times [2018-01-21 08:49:55,839 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:55,839 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:55,840 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:55,840 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:55,840 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:55,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:55,852 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:56,007 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,008 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,008 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:56,008 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:56,008 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:56,008 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,008 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:56,021 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:56,022 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:56,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:56,034 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:56,105 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,105 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:56,274 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,294 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,294 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:56,297 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:56,298 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:49:56,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:56,319 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:56,325 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,325 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:56,385 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,386 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:56,386 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 29 [2018-01-21 08:49:56,386 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:56,387 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 08:49:56,387 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 08:49:56,388 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=294, Invalid=518, Unknown=0, NotChecked=0, Total=812 [2018-01-21 08:49:56,388 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 20 states. [2018-01-21 08:49:56,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:56,442 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-21 08:49:56,442 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 08:49:56,443 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 25 [2018-01-21 08:49:56,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:56,443 INFO L225 Difference]: With dead ends: 36 [2018-01-21 08:49:56,444 INFO L226 Difference]: Without dead ends: 27 [2018-01-21 08:49:56,444 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 80 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=315, Invalid=555, Unknown=0, NotChecked=0, Total=870 [2018-01-21 08:49:56,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-21 08:49:56,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-21 08:49:56,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-21 08:49:56,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-21 08:49:56,448 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-21 08:49:56,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:56,449 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-21 08:49:56,449 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 08:49:56,449 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-21 08:49:56,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 08:49:56,450 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:56,450 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:56,450 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:56,450 INFO L82 PathProgramCache]: Analyzing trace with hash 1491414992, now seen corresponding path program 8 times [2018-01-21 08:49:56,451 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:56,451 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:56,452 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:49:56,452 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:56,452 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:56,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:56,464 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:56,586 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,586 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,586 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:56,586 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:56,587 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:56,587 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,587 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:56,595 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:56,595 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:56,603 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:56,606 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:56,607 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:56,609 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:56,682 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,682 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:56,899 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,918 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:56,919 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:56,921 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:49:56,922 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:56,931 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:56,940 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:56,948 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:56,951 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:56,957 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:56,957 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:57,040 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,041 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:57,041 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 32 [2018-01-21 08:49:57,041 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:57,041 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 08:49:57,042 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 08:49:57,042 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=635, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:49:57,042 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 22 states. [2018-01-21 08:49:57,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:57,075 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-21 08:49:57,075 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 08:49:57,075 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 26 [2018-01-21 08:49:57,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:57,075 INFO L225 Difference]: With dead ends: 37 [2018-01-21 08:49:57,075 INFO L226 Difference]: Without dead ends: 28 [2018-01-21 08:49:57,076 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=676, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 08:49:57,076 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-21 08:49:57,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-21 08:49:57,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-21 08:49:57,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-21 08:49:57,079 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-21 08:49:57,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:57,079 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-21 08:49:57,079 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 08:49:57,079 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-21 08:49:57,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 08:49:57,079 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:57,080 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:57,080 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:57,080 INFO L82 PathProgramCache]: Analyzing trace with hash 139406347, now seen corresponding path program 9 times [2018-01-21 08:49:57,080 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:57,080 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:57,081 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:57,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:57,081 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:57,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:57,090 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:57,236 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,237 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:57,237 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:57,237 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:57,237 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:57,237 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:57,237 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:57,244 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:57,244 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:57,255 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,264 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,266 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,268 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,270 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,271 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,272 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:57,273 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:57,339 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,339 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:57,553 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,573 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:57,573 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:57,576 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:49:57,576 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:49:57,585 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,592 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,600 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,608 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,617 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,625 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:49:57,632 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:57,634 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:57,638 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,638 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:57,711 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,712 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:57,712 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 35 [2018-01-21 08:49:57,712 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:57,713 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 08:49:57,713 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 08:49:57,713 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=426, Invalid=764, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 08:49:57,713 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 24 states. [2018-01-21 08:49:57,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:57,753 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-21 08:49:57,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:49:57,753 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 27 [2018-01-21 08:49:57,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:57,754 INFO L225 Difference]: With dead ends: 38 [2018-01-21 08:49:57,754 INFO L226 Difference]: Without dead ends: 29 [2018-01-21 08:49:57,755 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 84 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 457 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=451, Invalid=809, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 08:49:57,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-21 08:49:57,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-21 08:49:57,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-21 08:49:57,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-21 08:49:57,758 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-21 08:49:57,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:57,758 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-21 08:49:57,758 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 08:49:57,758 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-21 08:49:57,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 08:49:57,759 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:57,759 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:57,759 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:57,759 INFO L82 PathProgramCache]: Analyzing trace with hash 1176811312, now seen corresponding path program 10 times [2018-01-21 08:49:57,760 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:57,760 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:57,760 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:57,760 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:57,760 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:57,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:57,768 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:57,879 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,879 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:57,879 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:57,879 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:57,879 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:57,879 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:57,879 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:57,884 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:57,884 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:57,894 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:57,896 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:57,965 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:57,965 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:58,208 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,228 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:58,228 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:58,230 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:49:58,231 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:49:58,256 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:58,259 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:58,265 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,266 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:58,342 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,343 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:58,343 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 38 [2018-01-21 08:49:58,343 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:58,344 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 08:49:58,344 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 08:49:58,345 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=501, Invalid=905, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 08:49:58,345 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 26 states. [2018-01-21 08:49:58,389 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:58,390 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-21 08:49:58,390 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 08:49:58,390 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 28 [2018-01-21 08:49:58,390 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:58,391 INFO L225 Difference]: With dead ends: 39 [2018-01-21 08:49:58,391 INFO L226 Difference]: Without dead ends: 30 [2018-01-21 08:49:58,391 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 86 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 548 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=528, Invalid=954, Unknown=0, NotChecked=0, Total=1482 [2018-01-21 08:49:58,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-21 08:49:58,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-21 08:49:58,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-21 08:49:58,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-21 08:49:58,395 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-21 08:49:58,395 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:58,395 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-21 08:49:58,395 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 08:49:58,396 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-21 08:49:58,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 08:49:58,396 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:58,396 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:58,397 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:58,397 INFO L82 PathProgramCache]: Analyzing trace with hash -1023373141, now seen corresponding path program 11 times [2018-01-21 08:49:58,397 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:58,402 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:58,402 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:58,402 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:58,402 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:58,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:58,411 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:58,550 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,550 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:58,550 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:58,550 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:58,550 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:58,550 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:58,550 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:58,555 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:58,555 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:58,559 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,560 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,561 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,563 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,563 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,568 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:58,570 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:58,645 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,645 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:58,922 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,948 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:58,948 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:58,950 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:49:58,951 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:49:58,954 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,955 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,959 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,962 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,966 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,971 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,981 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:49:58,988 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:58,991 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:58,997 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:58,998 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:59,087 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:59,088 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:49:59,088 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 41 [2018-01-21 08:49:59,088 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:49:59,089 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 08:49:59,089 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 08:49:59,090 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=582, Invalid=1058, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:49:59,090 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 28 states. [2018-01-21 08:49:59,142 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:49:59,142 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-21 08:49:59,142 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 08:49:59,142 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 29 [2018-01-21 08:49:59,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:49:59,143 INFO L225 Difference]: With dead ends: 40 [2018-01-21 08:49:59,143 INFO L226 Difference]: Without dead ends: 31 [2018-01-21 08:49:59,143 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 647 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=611, Invalid=1111, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 08:49:59,144 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-21 08:49:59,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-21 08:49:59,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-21 08:49:59,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-21 08:49:59,146 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-21 08:49:59,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:49:59,146 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-21 08:49:59,146 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 08:49:59,146 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-21 08:49:59,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 08:49:59,147 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:49:59,147 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:49:59,147 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:49:59,147 INFO L82 PathProgramCache]: Analyzing trace with hash -509614448, now seen corresponding path program 12 times [2018-01-21 08:49:59,147 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:49:59,148 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:59,148 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:49:59,148 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:49:59,148 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:49:59,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:49:59,157 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:49:59,386 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:59,386 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:59,386 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:49:59,386 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:49:59,386 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:49:59,386 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:59,386 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:49:59,396 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:59,396 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:59,404 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,406 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,408 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,409 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,411 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,412 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,414 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,415 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:49:59,417 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:49:59,541 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:59,541 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:49:59,934 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:49:59,955 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:49:59,955 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:49:59,959 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:49:59,959 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:49:59,969 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,976 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:49:59,988 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:00,001 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:00,011 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:00,021 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:00,030 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:00,037 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:00,040 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:00,046 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,047 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:00,181 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,182 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:00,183 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 44 [2018-01-21 08:50:00,183 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:00,183 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 08:50:00,183 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 08:50:00,184 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=669, Invalid=1223, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 08:50:00,184 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 30 states. [2018-01-21 08:50:00,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:00,250 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-21 08:50:00,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 08:50:00,250 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 30 [2018-01-21 08:50:00,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:00,251 INFO L225 Difference]: With dead ends: 41 [2018-01-21 08:50:00,251 INFO L226 Difference]: Without dead ends: 32 [2018-01-21 08:50:00,251 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 754 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=700, Invalid=1280, Unknown=0, NotChecked=0, Total=1980 [2018-01-21 08:50:00,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-21 08:50:00,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-21 08:50:00,254 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-21 08:50:00,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-21 08:50:00,254 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-21 08:50:00,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:00,254 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-21 08:50:00,254 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 08:50:00,254 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-21 08:50:00,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:50:00,255 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:00,255 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:00,255 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:00,255 INFO L82 PathProgramCache]: Analyzing trace with hash -1762964149, now seen corresponding path program 13 times [2018-01-21 08:50:00,255 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:00,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:00,256 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:00,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:00,256 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:00,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:00,265 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:00,390 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,391 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:00,391 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:00,391 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:00,391 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:00,391 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:00,391 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:00,396 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:00,396 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:00,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:00,408 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:00,500 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,500 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:00,889 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,910 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:00,910 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:00,913 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:00,914 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:00,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:00,940 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:00,947 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:00,947 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:01,057 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:01,058 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:01,058 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 47 [2018-01-21 08:50:01,058 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:01,058 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 08:50:01,059 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 08:50:01,059 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=762, Invalid=1400, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:50:01,060 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 32 states. [2018-01-21 08:50:01,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:01,098 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-21 08:50:01,098 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:50:01,098 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 31 [2018-01-21 08:50:01,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:01,099 INFO L225 Difference]: With dead ends: 42 [2018-01-21 08:50:01,099 INFO L226 Difference]: Without dead ends: 33 [2018-01-21 08:50:01,100 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 92 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 869 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=795, Invalid=1461, Unknown=0, NotChecked=0, Total=2256 [2018-01-21 08:50:01,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-21 08:50:01,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-21 08:50:01,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-21 08:50:01,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-21 08:50:01,102 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-21 08:50:01,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:01,102 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-21 08:50:01,102 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 08:50:01,103 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-21 08:50:01,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 08:50:01,103 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:01,103 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:01,103 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:01,103 INFO L82 PathProgramCache]: Analyzing trace with hash -1962099216, now seen corresponding path program 14 times [2018-01-21 08:50:01,103 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:01,104 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:01,104 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:01,104 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:01,104 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:01,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:01,111 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:01,747 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:01,748 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:01,748 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:01,748 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:01,748 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:01,748 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:01,748 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:01,761 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:01,761 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:01,769 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:01,785 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:01,798 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:01,800 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:01,949 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:01,949 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:02,372 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:02,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:02,397 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:02,400 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:02,400 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:02,409 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:02,421 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:02,431 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:02,436 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:02,442 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:02,442 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:02,557 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:02,558 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:02,558 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 50 [2018-01-21 08:50:02,558 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:02,559 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 08:50:02,559 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 08:50:02,560 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=1589, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 08:50:02,560 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 34 states. [2018-01-21 08:50:02,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:02,637 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-21 08:50:02,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 08:50:02,637 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 32 [2018-01-21 08:50:02,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:02,638 INFO L225 Difference]: With dead ends: 43 [2018-01-21 08:50:02,638 INFO L226 Difference]: Without dead ends: 34 [2018-01-21 08:50:02,639 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 992 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=896, Invalid=1654, Unknown=0, NotChecked=0, Total=2550 [2018-01-21 08:50:02,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-21 08:50:02,641 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-21 08:50:02,641 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-21 08:50:02,642 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-21 08:50:02,642 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-21 08:50:02,642 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:02,642 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-21 08:50:02,643 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 08:50:02,643 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-21 08:50:02,643 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 08:50:02,643 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:02,643 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:02,643 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:02,644 INFO L82 PathProgramCache]: Analyzing trace with hash 454648299, now seen corresponding path program 15 times [2018-01-21 08:50:02,644 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:02,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:02,644 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:02,644 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:02,645 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:02,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:02,655 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:03,225 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:03,226 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:03,226 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:03,226 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:03,226 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:03,226 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:03,226 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:03,233 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:03,233 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:03,241 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,242 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,244 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,245 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,246 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,247 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,248 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,250 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,251 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:03,252 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:03,253 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:03,413 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:03,413 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:03,997 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:04,017 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:04,017 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:04,021 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:04,021 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:04,032 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,039 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,050 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,059 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,068 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,087 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,097 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,113 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:04,121 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:04,125 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:04,132 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:04,132 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:04,276 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:04,277 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:04,277 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 53 [2018-01-21 08:50:04,277 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:04,277 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 08:50:04,278 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 08:50:04,278 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=966, Invalid=1790, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 08:50:04,278 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 36 states. [2018-01-21 08:50:04,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:04,341 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-21 08:50:04,342 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 08:50:04,342 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 33 [2018-01-21 08:50:04,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:04,342 INFO L225 Difference]: With dead ends: 44 [2018-01-21 08:50:04,342 INFO L226 Difference]: Without dead ends: 35 [2018-01-21 08:50:04,344 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 96 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1123 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1003, Invalid=1859, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 08:50:04,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-21 08:50:04,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-21 08:50:04,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-21 08:50:04,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-21 08:50:04,347 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-21 08:50:04,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:04,348 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-21 08:50:04,348 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 08:50:04,348 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-21 08:50:04,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 08:50:04,349 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:04,349 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:04,349 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:04,349 INFO L82 PathProgramCache]: Analyzing trace with hash -1935590064, now seen corresponding path program 16 times [2018-01-21 08:50:04,349 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:04,350 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:04,350 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:04,350 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:04,350 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:04,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:04,360 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:04,615 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:04,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:04,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:04,616 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:04,616 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:04,616 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:04,616 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:04,625 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:04,625 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:04,638 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:04,640 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:04,821 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:04,821 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:05,399 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:05,419 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:05,420 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 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 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:05,422 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:05,422 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:05,454 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:05,458 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:05,465 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:05,465 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:05,603 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:05,605 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:05,605 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 56 [2018-01-21 08:50:05,605 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:05,605 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 08:50:05,606 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 08:50:05,607 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1077, Invalid=2003, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 08:50:05,607 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 38 states. [2018-01-21 08:50:05,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:05,740 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-21 08:50:05,740 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 08:50:05,740 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 34 [2018-01-21 08:50:05,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:05,741 INFO L225 Difference]: With dead ends: 45 [2018-01-21 08:50:05,741 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 08:50:05,742 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1262 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1116, Invalid=2076, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 08:50:05,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 08:50:05,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 08:50:05,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 08:50:05,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-21 08:50:05,745 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-21 08:50:05,745 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:05,745 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-21 08:50:05,745 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 08:50:05,745 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-21 08:50:05,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 08:50:05,746 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:05,746 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:05,746 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:05,747 INFO L82 PathProgramCache]: Analyzing trace with hash 1276432011, now seen corresponding path program 17 times [2018-01-21 08:50:05,747 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:05,747 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:05,748 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:05,748 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:05,748 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:05,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:05,755 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:05,976 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:05,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:05,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:05,976 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:05,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:05,977 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:05,977 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:05,982 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:05,982 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:05,986 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,986 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,987 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,988 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,989 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,989 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,990 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,991 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,992 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,996 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:05,997 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:05,998 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:06,141 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:06,142 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:06,776 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:06,796 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:06,796 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 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 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:06,800 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:06,800 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:06,805 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,807 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,812 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,818 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,825 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,832 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,840 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,848 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,854 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,865 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:06,874 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:06,878 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:06,882 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:06,882 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:07,030 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:07,031 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:07,031 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 59 [2018-01-21 08:50:07,032 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:07,032 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 08:50:07,032 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 08:50:07,033 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1194, Invalid=2228, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 08:50:07,033 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 40 states. [2018-01-21 08:50:07,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:07,080 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-21 08:50:07,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 08:50:07,081 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 35 [2018-01-21 08:50:07,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:07,082 INFO L225 Difference]: With dead ends: 46 [2018-01-21 08:50:07,082 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:50:07,083 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1409 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1235, Invalid=2305, Unknown=0, NotChecked=0, Total=3540 [2018-01-21 08:50:07,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:50:07,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:50:07,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:50:07,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-21 08:50:07,086 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-21 08:50:07,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:07,086 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-21 08:50:07,086 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 08:50:07,086 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-21 08:50:07,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 08:50:07,087 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:07,087 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:07,087 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:07,087 INFO L82 PathProgramCache]: Analyzing trace with hash 2064868528, now seen corresponding path program 18 times [2018-01-21 08:50:07,087 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:07,088 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:07,088 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:07,088 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:07,088 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:07,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:07,096 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:07,348 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:07,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:07,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:07,348 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:07,348 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:07,348 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:07,348 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:07,355 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:07,355 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:07,362 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,364 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,365 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,366 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,367 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,369 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,370 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,371 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,372 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:07,373 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:07,374 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:07,521 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:07,521 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:08,072 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:08,092 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:08,092 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 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 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:08,095 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:08,095 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:08,104 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,110 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,119 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,127 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,136 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,155 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,165 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,187 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:08,196 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:08,199 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:08,204 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:08,204 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:08,333 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:08,334 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:08,334 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 62 [2018-01-21 08:50:08,334 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:08,334 INFO L409 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-01-21 08:50:08,335 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-01-21 08:50:08,335 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1317, Invalid=2465, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 08:50:08,335 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 42 states. [2018-01-21 08:50:08,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:08,384 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-21 08:50:08,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 08:50:08,385 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 36 [2018-01-21 08:50:08,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:08,385 INFO L225 Difference]: With dead ends: 47 [2018-01-21 08:50:08,385 INFO L226 Difference]: Without dead ends: 38 [2018-01-21 08:50:08,386 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 102 SyntacticMatches, 2 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1564 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1360, Invalid=2546, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 08:50:08,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-21 08:50:08,388 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-21 08:50:08,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 08:50:08,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-21 08:50:08,389 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-21 08:50:08,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:08,389 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-21 08:50:08,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-01-21 08:50:08,389 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-21 08:50:08,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 08:50:08,390 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:08,390 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:08,390 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:08,390 INFO L82 PathProgramCache]: Analyzing trace with hash 736596779, now seen corresponding path program 19 times [2018-01-21 08:50:08,390 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:08,390 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:08,391 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:08,391 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:08,391 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:08,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:08,399 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:08,603 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:08,603 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:08,603 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:08,603 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:08,603 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:08,603 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:08,603 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:08,608 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:08,608 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:08,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:08,621 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:08,780 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:08,780 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:09,368 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:09,387 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:09,387 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 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 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:09,390 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:09,390 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:09,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:09,426 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:09,433 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:09,433 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:09,576 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:09,577 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:09,577 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 65 [2018-01-21 08:50:09,577 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:09,577 INFO L409 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-01-21 08:50:09,577 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-01-21 08:50:09,578 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1446, Invalid=2714, Unknown=0, NotChecked=0, Total=4160 [2018-01-21 08:50:09,578 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 44 states. [2018-01-21 08:50:09,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:09,620 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-21 08:50:09,620 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 08:50:09,620 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 37 [2018-01-21 08:50:09,620 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:09,620 INFO L225 Difference]: With dead ends: 48 [2018-01-21 08:50:09,620 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 08:50:09,621 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1727 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1491, Invalid=2799, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 08:50:09,621 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 08:50:09,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 08:50:09,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 08:50:09,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-21 08:50:09,623 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-21 08:50:09,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:09,623 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-21 08:50:09,623 INFO L433 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-01-21 08:50:09,624 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-21 08:50:09,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-21 08:50:09,624 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:09,624 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:09,624 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:09,624 INFO L82 PathProgramCache]: Analyzing trace with hash -1785121776, now seen corresponding path program 20 times [2018-01-21 08:50:09,624 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:09,625 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:09,625 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:09,625 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:09,625 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:09,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:09,632 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:09,870 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:09,871 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:09,871 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:09,871 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:09,871 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:09,871 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:09,871 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:09,876 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:09,876 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:09,882 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:09,887 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:09,888 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:09,890 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:10,061 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:10,061 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:10,702 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:10,722 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:10,722 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 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 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:10,725 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:10,725 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:10,734 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:10,747 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:10,757 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:10,760 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:10,767 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:10,920 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:10,921 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:10,921 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 68 [2018-01-21 08:50:10,921 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:10,921 INFO L409 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-01-21 08:50:10,921 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-01-21 08:50:10,922 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=2975, Unknown=0, NotChecked=0, Total=4556 [2018-01-21 08:50:10,922 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 46 states. [2018-01-21 08:50:10,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:10,967 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-21 08:50:10,967 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 08:50:10,967 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 38 [2018-01-21 08:50:10,967 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:10,968 INFO L225 Difference]: With dead ends: 49 [2018-01-21 08:50:10,968 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 08:50:10,968 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1898 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1628, Invalid=3064, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 08:50:10,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 08:50:10,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 08:50:10,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 08:50:10,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-21 08:50:10,971 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-21 08:50:10,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:10,971 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-21 08:50:10,972 INFO L433 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-01-21 08:50:10,972 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-21 08:50:10,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 08:50:10,972 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:10,972 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:10,972 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:10,973 INFO L82 PathProgramCache]: Analyzing trace with hash 1645981643, now seen corresponding path program 21 times [2018-01-21 08:50:10,973 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:10,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:10,974 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:10,974 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:10,974 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:10,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:10,981 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:11,264 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:11,264 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:11,264 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:11,265 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:11,265 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:11,265 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:11,265 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:11,269 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:11,270 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:11,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,277 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,278 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,279 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,280 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,281 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,283 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,284 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,285 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,287 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,288 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:11,288 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:11,289 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:11,470 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:11,470 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:12,162 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:12,183 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:12,183 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 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 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:12,186 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:12,186 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:12,195 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,202 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,210 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,218 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,226 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,235 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,245 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,255 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,265 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,287 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,299 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:12,307 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:12,310 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:12,316 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:12,316 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:12,472 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:12,473 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:12,473 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 71 [2018-01-21 08:50:12,473 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:12,474 INFO L409 AbstractCegarLoop]: Interpolant automaton has 48 states [2018-01-21 08:50:12,474 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2018-01-21 08:50:12,474 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1722, Invalid=3248, Unknown=0, NotChecked=0, Total=4970 [2018-01-21 08:50:12,474 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 48 states. [2018-01-21 08:50:12,530 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:12,530 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-21 08:50:12,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 08:50:12,531 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 39 [2018-01-21 08:50:12,531 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:12,531 INFO L225 Difference]: With dead ends: 50 [2018-01-21 08:50:12,531 INFO L226 Difference]: Without dead ends: 41 [2018-01-21 08:50:12,532 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 108 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1771, Invalid=3341, Unknown=0, NotChecked=0, Total=5112 [2018-01-21 08:50:12,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-21 08:50:12,533 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-21 08:50:12,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:50:12,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-21 08:50:12,534 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-21 08:50:12,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:12,534 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-21 08:50:12,534 INFO L433 AbstractCegarLoop]: Interpolant automaton has 48 states. [2018-01-21 08:50:12,534 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-21 08:50:12,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 08:50:12,535 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:12,535 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:12,535 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:12,535 INFO L82 PathProgramCache]: Analyzing trace with hash 636005232, now seen corresponding path program 22 times [2018-01-21 08:50:12,535 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:12,536 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:12,536 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:12,536 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:12,536 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:12,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:12,544 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:12,818 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:12,819 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:12,819 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:12,819 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:12,819 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:12,819 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:12,819 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:12,824 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:12,824 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:12,837 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:12,838 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:13,029 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:13,029 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:13,791 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:13,811 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:13,811 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 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 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:13,813 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:13,813 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:13,847 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:13,850 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:13,855 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:13,855 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:14,023 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:14,024 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:14,024 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 74 [2018-01-21 08:50:14,024 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:14,025 INFO L409 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-01-21 08:50:14,025 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-01-21 08:50:14,025 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1869, Invalid=3533, Unknown=0, NotChecked=0, Total=5402 [2018-01-21 08:50:14,025 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 50 states. [2018-01-21 08:50:14,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:14,100 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-21 08:50:14,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 08:50:14,100 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 40 [2018-01-21 08:50:14,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:14,101 INFO L225 Difference]: With dead ends: 51 [2018-01-21 08:50:14,101 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 08:50:14,101 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 110 SyntacticMatches, 2 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2264 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1920, Invalid=3630, Unknown=0, NotChecked=0, Total=5550 [2018-01-21 08:50:14,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 08:50:14,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-21 08:50:14,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-21 08:50:14,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-21 08:50:14,104 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-21 08:50:14,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:14,104 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-21 08:50:14,104 INFO L433 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-01-21 08:50:14,104 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-21 08:50:14,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 08:50:14,105 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:14,105 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:14,105 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:14,105 INFO L82 PathProgramCache]: Analyzing trace with hash -608492437, now seen corresponding path program 23 times [2018-01-21 08:50:14,105 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:14,105 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:14,106 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:14,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:14,106 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:14,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:14,115 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:14,389 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:14,389 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:14,389 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:14,390 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:14,390 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:14,390 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:14,390 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:14,397 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:14,397 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:14,401 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,402 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,403 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,404 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,405 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,405 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,406 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,407 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,408 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,409 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,410 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,414 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:14,415 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:14,417 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:14,627 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:14,627 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:15,440 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:15,459 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:15,459 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 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 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:15,462 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:15,462 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:15,467 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,468 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,472 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,476 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,480 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,485 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,490 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,495 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,500 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,506 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,513 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,537 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:15,548 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:15,551 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:15,557 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:15,557 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:15,766 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:15,767 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:15,767 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 77 [2018-01-21 08:50:15,767 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:15,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-01-21 08:50:15,767 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-01-21 08:50:15,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2022, Invalid=3830, Unknown=0, NotChecked=0, Total=5852 [2018-01-21 08:50:15,768 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 52 states. [2018-01-21 08:50:15,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:15,863 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-21 08:50:15,863 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 08:50:15,863 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 41 [2018-01-21 08:50:15,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:15,863 INFO L225 Difference]: With dead ends: 52 [2018-01-21 08:50:15,863 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 08:50:15,864 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2459 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=2075, Invalid=3931, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 08:50:15,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 08:50:15,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 08:50:15,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:50:15,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-21 08:50:15,867 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-21 08:50:15,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:15,868 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-21 08:50:15,868 INFO L433 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-01-21 08:50:15,868 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-21 08:50:15,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 08:50:15,868 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:15,869 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:15,869 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:15,869 INFO L82 PathProgramCache]: Analyzing trace with hash -533214512, now seen corresponding path program 24 times [2018-01-21 08:50:15,869 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:15,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:15,870 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:15,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:15,870 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:15,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:15,881 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:16,147 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:16,147 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:16,147 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:16,147 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:16,147 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:16,147 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:16,147 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:16,152 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:16,152 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:16,159 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,160 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,161 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,163 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,164 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,165 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,166 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,167 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,168 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,169 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,170 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,172 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:16,172 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:16,174 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:16,398 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:16,398 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:17,262 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:17,282 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:17,282 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 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 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:17,285 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:17,285 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:17,295 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,310 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,318 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,326 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,335 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,345 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,356 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,366 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,388 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,400 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,412 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:17,421 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:17,425 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:17,430 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:17,430 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:17,628 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:17,629 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:17,629 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 80 [2018-01-21 08:50:17,629 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:17,629 INFO L409 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-01-21 08:50:17,630 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-01-21 08:50:17,631 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2181, Invalid=4139, Unknown=0, NotChecked=0, Total=6320 [2018-01-21 08:50:17,631 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 54 states. [2018-01-21 08:50:17,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:17,721 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-21 08:50:17,722 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 08:50:17,722 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 42 [2018-01-21 08:50:17,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:17,723 INFO L225 Difference]: With dead ends: 53 [2018-01-21 08:50:17,723 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 08:50:17,723 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 114 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2662 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=2236, Invalid=4244, Unknown=0, NotChecked=0, Total=6480 [2018-01-21 08:50:17,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 08:50:17,727 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-21 08:50:17,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 08:50:17,727 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-21 08:50:17,728 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-21 08:50:17,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:17,728 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-21 08:50:17,728 INFO L433 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-01-21 08:50:17,728 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-21 08:50:17,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 08:50:17,729 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:17,729 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:17,729 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:17,729 INFO L82 PathProgramCache]: Analyzing trace with hash 1800401163, now seen corresponding path program 25 times [2018-01-21 08:50:17,729 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:17,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:17,730 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:17,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:17,730 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:17,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:17,741 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:18,057 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:18,057 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:18,057 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:18,057 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:18,057 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:18,057 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:18,057 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:18,062 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:18,062 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:18,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:18,076 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:18,322 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:18,322 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:19,246 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:19,266 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:19,266 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 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 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:19,269 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:19,269 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:19,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:19,299 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:19,305 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:19,305 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:19,508 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:19,509 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:19,509 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 83 [2018-01-21 08:50:19,509 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:19,509 INFO L409 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-01-21 08:50:19,510 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-01-21 08:50:19,510 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2346, Invalid=4460, Unknown=0, NotChecked=0, Total=6806 [2018-01-21 08:50:19,510 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 56 states. [2018-01-21 08:50:19,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:19,562 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-21 08:50:19,563 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 08:50:19,563 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 43 [2018-01-21 08:50:19,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:19,563 INFO L225 Difference]: With dead ends: 54 [2018-01-21 08:50:19,564 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 08:50:19,564 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 116 SyntacticMatches, 2 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2873 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2403, Invalid=4569, Unknown=0, NotChecked=0, Total=6972 [2018-01-21 08:50:19,564 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 08:50:19,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-21 08:50:19,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-21 08:50:19,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-21 08:50:19,566 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-21 08:50:19,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:19,567 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-21 08:50:19,567 INFO L433 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-01-21 08:50:19,567 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-21 08:50:19,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 08:50:19,567 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:19,567 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:19,567 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:19,567 INFO L82 PathProgramCache]: Analyzing trace with hash 1128043056, now seen corresponding path program 26 times [2018-01-21 08:50:19,567 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:19,568 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:19,568 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:19,568 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:19,568 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:19,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:19,578 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:19,889 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:19,890 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:19,890 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:19,890 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:19,890 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:19,890 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:19,890 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:19,895 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:19,896 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:19,902 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:19,907 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:19,909 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:19,910 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:20,163 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:20,163 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:21,151 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:21,170 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:21,170 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 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 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:21,173 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:21,173 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:21,183 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:21,196 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:21,208 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:21,211 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:21,217 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:21,217 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:21,423 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:21,424 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:21,424 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 86 [2018-01-21 08:50:21,424 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:21,424 INFO L409 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-01-21 08:50:21,425 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-01-21 08:50:21,425 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2517, Invalid=4793, Unknown=0, NotChecked=0, Total=7310 [2018-01-21 08:50:21,425 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 58 states. [2018-01-21 08:50:21,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:21,495 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-21 08:50:21,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 08:50:21,495 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 44 [2018-01-21 08:50:21,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:21,495 INFO L225 Difference]: With dead ends: 55 [2018-01-21 08:50:21,495 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 08:50:21,496 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3092 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2576, Invalid=4906, Unknown=0, NotChecked=0, Total=7482 [2018-01-21 08:50:21,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 08:50:21,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-21 08:50:21,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 08:50:21,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-21 08:50:21,499 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-21 08:50:21,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:21,499 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-21 08:50:21,499 INFO L433 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-01-21 08:50:21,499 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-21 08:50:21,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 08:50:21,500 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:21,500 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:21,500 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:21,500 INFO L82 PathProgramCache]: Analyzing trace with hash 1759778219, now seen corresponding path program 27 times [2018-01-21 08:50:21,500 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:21,500 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:21,501 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:21,501 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:21,501 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:21,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:21,508 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:21,934 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:21,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:21,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:21,934 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:21,934 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:21,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:21,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:21,939 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:21,939 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:21,946 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,948 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,949 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,950 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,951 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,953 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,954 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,956 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,957 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,958 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,960 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,961 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,968 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,970 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,971 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:21,971 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:21,973 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:22,245 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:22,246 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:23,299 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:23,324 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:23,324 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 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 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:23,327 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:23,327 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:23,337 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,344 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,351 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,359 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,368 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,377 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,386 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,396 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,406 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,417 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,428 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,440 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,451 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:23,486 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:23,490 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:23,498 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:23,498 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:23,718 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:23,719 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:23,719 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 89 [2018-01-21 08:50:23,719 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:23,720 INFO L409 AbstractCegarLoop]: Interpolant automaton has 60 states [2018-01-21 08:50:23,720 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2018-01-21 08:50:23,720 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2694, Invalid=5138, Unknown=0, NotChecked=0, Total=7832 [2018-01-21 08:50:23,720 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 60 states. [2018-01-21 08:50:23,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:23,775 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-21 08:50:23,776 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 08:50:23,776 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 45 [2018-01-21 08:50:23,776 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:23,776 INFO L225 Difference]: With dead ends: 56 [2018-01-21 08:50:23,776 INFO L226 Difference]: Without dead ends: 47 [2018-01-21 08:50:23,777 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 2 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3319 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2755, Invalid=5255, Unknown=0, NotChecked=0, Total=8010 [2018-01-21 08:50:23,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-21 08:50:23,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-21 08:50:23,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 08:50:23,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-21 08:50:23,779 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-21 08:50:23,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:23,779 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-21 08:50:23,779 INFO L433 AbstractCegarLoop]: Interpolant automaton has 60 states. [2018-01-21 08:50:23,779 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-21 08:50:23,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 08:50:23,779 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:23,780 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:23,780 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:23,780 INFO L82 PathProgramCache]: Analyzing trace with hash -131268208, now seen corresponding path program 28 times [2018-01-21 08:50:23,780 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:23,780 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:23,780 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:23,780 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:23,781 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:23,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:23,791 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:24,296 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:24,296 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:24,296 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:24,296 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:24,296 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:24,296 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:24,296 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:24,302 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:24,302 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:24,322 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:24,325 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:24,649 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:24,649 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:25,766 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:25,785 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:25,785 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 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 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:25,788 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:25,789 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:25,827 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:25,830 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:25,836 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:25,837 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:26,064 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:26,065 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:26,065 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 92 [2018-01-21 08:50:26,065 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:26,065 INFO L409 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-01-21 08:50:26,065 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-01-21 08:50:26,066 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2877, Invalid=5495, Unknown=0, NotChecked=0, Total=8372 [2018-01-21 08:50:26,066 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 62 states. [2018-01-21 08:50:26,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:26,128 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-21 08:50:26,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 08:50:26,128 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 46 [2018-01-21 08:50:26,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:26,128 INFO L225 Difference]: With dead ends: 57 [2018-01-21 08:50:26,129 INFO L226 Difference]: Without dead ends: 48 [2018-01-21 08:50:26,129 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 122 SyntacticMatches, 2 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3554 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2940, Invalid=5616, Unknown=0, NotChecked=0, Total=8556 [2018-01-21 08:50:26,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-21 08:50:26,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-21 08:50:26,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 08:50:26,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-21 08:50:26,131 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-21 08:50:26,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:26,131 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-21 08:50:26,132 INFO L433 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-01-21 08:50:26,132 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-21 08:50:26,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 08:50:26,132 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:26,132 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:26,132 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:26,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1375834699, now seen corresponding path program 29 times [2018-01-21 08:50:26,132 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:26,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:26,133 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:26,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:26,133 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:26,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:26,144 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:26,554 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:26,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:26,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:26,555 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:26,555 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:26,555 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:26,555 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:26,559 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:26,560 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:26,564 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,564 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,565 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,566 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,567 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,568 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,569 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,570 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,571 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,571 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,572 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,573 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,574 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,575 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,579 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:26,580 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:26,582 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:26,892 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:26,893 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:28,074 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:28,094 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:28,094 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 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 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:28,097 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:28,097 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:28,102 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,103 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,106 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,110 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,114 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,118 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,122 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,127 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,133 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,138 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,144 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,151 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,158 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,173 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,186 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:28,197 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:28,200 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:28,206 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:28,206 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:28,458 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:28,459 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:28,459 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 95 [2018-01-21 08:50:28,460 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:28,460 INFO L409 AbstractCegarLoop]: Interpolant automaton has 64 states [2018-01-21 08:50:28,460 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2018-01-21 08:50:28,460 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3066, Invalid=5864, Unknown=0, NotChecked=0, Total=8930 [2018-01-21 08:50:28,461 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 64 states. [2018-01-21 08:50:28,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:28,531 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-21 08:50:28,531 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 08:50:28,531 INFO L78 Accepts]: Start accepts. Automaton has 64 states. Word has length 47 [2018-01-21 08:50:28,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:28,532 INFO L225 Difference]: With dead ends: 58 [2018-01-21 08:50:28,532 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 08:50:28,533 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3797 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=3131, Invalid=5989, Unknown=0, NotChecked=0, Total=9120 [2018-01-21 08:50:28,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 08:50:28,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-21 08:50:28,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-21 08:50:28,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-21 08:50:28,535 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-21 08:50:28,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:28,535 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-21 08:50:28,535 INFO L433 AbstractCegarLoop]: Interpolant automaton has 64 states. [2018-01-21 08:50:28,535 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-21 08:50:28,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 08:50:28,535 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:28,535 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:28,536 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:28,536 INFO L82 PathProgramCache]: Analyzing trace with hash 851384560, now seen corresponding path program 30 times [2018-01-21 08:50:28,536 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:28,536 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:28,537 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:28,537 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:28,537 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:28,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:28,548 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:28,934 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:28,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:28,934 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:28,934 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:28,934 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:28,934 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:28,935 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:28,939 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:28,939 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:28,946 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,948 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,950 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,951 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,952 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,953 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,954 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,956 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,957 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,959 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,960 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,961 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,962 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,963 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:28,964 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:28,965 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:29,300 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:29,300 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:30,604 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:30,624 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:30,624 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 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 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:30,627 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:50:30,627 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:50:30,636 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,643 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,650 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,658 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,667 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,675 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,685 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,694 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,704 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,715 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,726 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,737 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,749 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,762 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,775 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,788 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:50:30,799 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:30,803 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:30,813 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:30,813 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:31,086 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:31,087 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:31,088 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 98 [2018-01-21 08:50:31,088 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:31,088 INFO L409 AbstractCegarLoop]: Interpolant automaton has 66 states [2018-01-21 08:50:31,088 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2018-01-21 08:50:31,089 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3261, Invalid=6245, Unknown=0, NotChecked=0, Total=9506 [2018-01-21 08:50:31,089 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 66 states. [2018-01-21 08:50:31,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:31,158 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-21 08:50:31,158 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-21 08:50:31,158 INFO L78 Accepts]: Start accepts. Automaton has 66 states. Word has length 48 [2018-01-21 08:50:31,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:31,159 INFO L225 Difference]: With dead ends: 59 [2018-01-21 08:50:31,159 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 08:50:31,159 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 126 SyntacticMatches, 2 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4048 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=3328, Invalid=6374, Unknown=0, NotChecked=0, Total=9702 [2018-01-21 08:50:31,160 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 08:50:31,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-21 08:50:31,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 08:50:31,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-21 08:50:31,162 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-21 08:50:31,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:31,162 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-21 08:50:31,162 INFO L433 AbstractCegarLoop]: Interpolant automaton has 66 states. [2018-01-21 08:50:31,162 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-21 08:50:31,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 08:50:31,162 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:31,162 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:31,162 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:31,163 INFO L82 PathProgramCache]: Analyzing trace with hash 1773299435, now seen corresponding path program 31 times [2018-01-21 08:50:31,163 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:31,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:31,163 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:31,163 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:31,164 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:31,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:31,172 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:31,820 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:31,820 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:31,820 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:31,820 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:31,820 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:31,820 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:31,820 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:31,825 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:31,826 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:31,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:31,840 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:32,184 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:32,184 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:33,517 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:33,536 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:33,537 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 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 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:33,540 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:33,540 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:50:33,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:33,578 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:33,585 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:33,585 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:33,848 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:33,849 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:33,849 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 101 [2018-01-21 08:50:33,849 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:33,849 INFO L409 AbstractCegarLoop]: Interpolant automaton has 68 states [2018-01-21 08:50:33,849 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 68 interpolants. [2018-01-21 08:50:33,850 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3462, Invalid=6638, Unknown=0, NotChecked=0, Total=10100 [2018-01-21 08:50:33,850 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 68 states. [2018-01-21 08:50:33,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:33,921 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-21 08:50:33,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 08:50:33,921 INFO L78 Accepts]: Start accepts. Automaton has 68 states. Word has length 49 [2018-01-21 08:50:33,921 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:33,922 INFO L225 Difference]: With dead ends: 60 [2018-01-21 08:50:33,922 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:50:33,922 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 128 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4307 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3531, Invalid=6771, Unknown=0, NotChecked=0, Total=10302 [2018-01-21 08:50:33,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:50:33,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-21 08:50:33,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-21 08:50:33,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-21 08:50:33,924 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-21 08:50:33,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:33,924 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-21 08:50:33,925 INFO L433 AbstractCegarLoop]: Interpolant automaton has 68 states. [2018-01-21 08:50:33,925 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-21 08:50:33,925 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 08:50:33,925 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:33,925 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:33,925 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:33,925 INFO L82 PathProgramCache]: Analyzing trace with hash 287889488, now seen corresponding path program 32 times [2018-01-21 08:50:33,925 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:33,926 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:33,926 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:50:33,926 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:33,926 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:33,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:33,938 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:34,473 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:34,473 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:34,474 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:34,474 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:34,474 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:34,474 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:34,474 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:34,479 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:34,479 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:34,486 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:34,492 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:34,494 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:34,495 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:34,858 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:34,858 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:36,270 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:36,289 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:36,289 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 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 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:36,292 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:50:36,292 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:36,301 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:36,316 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:36,329 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:36,333 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:36,339 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:36,340 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:36,617 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:36,618 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:36,618 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 104 [2018-01-21 08:50:36,618 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:36,619 INFO L409 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-01-21 08:50:36,619 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-01-21 08:50:36,620 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3669, Invalid=7043, Unknown=0, NotChecked=0, Total=10712 [2018-01-21 08:50:36,620 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 70 states. [2018-01-21 08:50:36,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:36,760 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-21 08:50:36,760 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-21 08:50:36,760 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 50 [2018-01-21 08:50:36,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:36,761 INFO L225 Difference]: With dead ends: 61 [2018-01-21 08:50:36,761 INFO L226 Difference]: Without dead ends: 52 [2018-01-21 08:50:36,762 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4574 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3740, Invalid=7180, Unknown=0, NotChecked=0, Total=10920 [2018-01-21 08:50:36,762 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-21 08:50:36,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-21 08:50:36,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 08:50:36,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-21 08:50:36,764 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-21 08:50:36,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:36,764 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-21 08:50:36,764 INFO L433 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-01-21 08:50:36,765 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-21 08:50:36,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 08:50:36,765 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:36,765 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:36,765 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:36,765 INFO L82 PathProgramCache]: Analyzing trace with hash 1484821387, now seen corresponding path program 33 times [2018-01-21 08:50:36,765 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:36,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:36,766 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:36,766 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:36,766 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:36,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:36,774 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:37,254 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:37,254 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:37,254 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:37,254 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:37,254 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:37,254 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:37,254 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:37,259 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:37,259 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:37,266 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,268 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,269 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,269 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,270 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,271 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,273 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,274 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,275 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,276 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,277 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,278 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,279 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,280 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,281 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,282 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,284 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,285 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:37,285 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:37,287 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:37,670 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:37,670 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:39,157 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:39,178 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:39,178 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 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 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:39,181 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:50:39,181 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:50:39,191 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,197 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,205 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,213 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,221 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,230 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,240 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,249 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,259 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,270 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,281 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,293 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,305 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,317 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,330 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,344 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,357 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,371 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:50:39,382 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:39,385 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:39,392 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:39,392 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:39,683 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:39,684 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:39,685 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 107 [2018-01-21 08:50:39,685 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:39,685 INFO L409 AbstractCegarLoop]: Interpolant automaton has 72 states [2018-01-21 08:50:39,686 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2018-01-21 08:50:39,686 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3882, Invalid=7460, Unknown=0, NotChecked=0, Total=11342 [2018-01-21 08:50:39,687 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 72 states. [2018-01-21 08:50:39,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:39,778 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-21 08:50:39,778 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-21 08:50:39,778 INFO L78 Accepts]: Start accepts. Automaton has 72 states. Word has length 51 [2018-01-21 08:50:39,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:39,779 INFO L225 Difference]: With dead ends: 62 [2018-01-21 08:50:39,779 INFO L226 Difference]: Without dead ends: 53 [2018-01-21 08:50:39,779 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4849 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3955, Invalid=7601, Unknown=0, NotChecked=0, Total=11556 [2018-01-21 08:50:39,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-21 08:50:39,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-21 08:50:39,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 08:50:39,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-21 08:50:39,782 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-21 08:50:39,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:39,782 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-21 08:50:39,782 INFO L433 AbstractCegarLoop]: Interpolant automaton has 72 states. [2018-01-21 08:50:39,782 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-21 08:50:39,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 08:50:39,782 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:39,782 INFO L322 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:39,782 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:39,783 INFO L82 PathProgramCache]: Analyzing trace with hash -64995408, now seen corresponding path program 34 times [2018-01-21 08:50:39,783 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:39,783 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:39,783 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:39,783 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:39,783 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:39,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:39,792 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:40,403 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:40,403 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:40,403 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:40,403 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:40,403 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:40,403 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:40,403 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:40,408 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:40,408 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:40,424 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:40,425 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:40,832 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:40,832 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:42,418 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:42,437 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:42,438 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 69 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 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:50:42,441 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:50:42,441 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:50:42,497 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:42,501 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:42,512 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:42,512 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:50:42,629 WARN L143 SmtUtils]: Spent 114ms on a formula simplification that was a NOOP. DAG size: 110 [2018-01-21 08:50:42,926 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:42,927 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:50:42,927 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 110 [2018-01-21 08:50:42,927 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:50:42,927 INFO L409 AbstractCegarLoop]: Interpolant automaton has 74 states [2018-01-21 08:50:42,928 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 74 interpolants. [2018-01-21 08:50:42,928 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=4101, Invalid=7889, Unknown=0, NotChecked=0, Total=11990 [2018-01-21 08:50:42,928 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 74 states. [2018-01-21 08:50:42,985 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:50:42,986 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-21 08:50:42,986 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 08:50:42,986 INFO L78 Accepts]: Start accepts. Automaton has 74 states. Word has length 52 [2018-01-21 08:50:42,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:50:42,986 INFO L225 Difference]: With dead ends: 63 [2018-01-21 08:50:42,987 INFO L226 Difference]: Without dead ends: 54 [2018-01-21 08:50:42,987 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 134 SyntacticMatches, 2 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5132 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=4176, Invalid=8034, Unknown=0, NotChecked=0, Total=12210 [2018-01-21 08:50:42,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-21 08:50:42,989 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-21 08:50:42,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-21 08:50:42,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-21 08:50:42,989 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-21 08:50:42,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:50:42,989 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-21 08:50:42,989 INFO L433 AbstractCegarLoop]: Interpolant automaton has 74 states. [2018-01-21 08:50:42,990 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-21 08:50:42,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 08:50:42,990 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:50:42,990 INFO L322 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:50:42,990 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:50:42,990 INFO L82 PathProgramCache]: Analyzing trace with hash -864675797, now seen corresponding path program 35 times [2018-01-21 08:50:42,990 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:50:42,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:42,991 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:50:42,991 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:50:42,991 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:50:42,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:50:43,000 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:50:43,615 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:43,615 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:43,615 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:50:43,615 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:50:43,615 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:50:43,615 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:50:43,615 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:50:43,620 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:50:43,620 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:50:43,624 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,625 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,626 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,626 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,627 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,628 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,629 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,629 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,630 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,631 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,632 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,633 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,634 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,635 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,636 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,638 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,642 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:50:43,643 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:50:43,645 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:50:44,076 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:50:44,076 INFO L314 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-01-21 08:50:44,378 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-21 08:50:44,405 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 08:50:44,408 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:50:44,408 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:50:44,408 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:50:44,408 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:50:44,408 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:50:44,408 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:50:44,409 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:50:44,409 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 08:50:44,409 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:50:44,409 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 08:50:44,410 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 08:50:44,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.01 08:50:44 BoogieIcfgContainer [2018-01-21 08:50:44,411 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-21 08:50:44,412 INFO L168 Benchmark]: Toolchain (without parser) took 53306.05 ms. Allocated memory was 302.5 MB in the beginning and 833.6 MB in the end (delta: 531.1 MB). Free memory was 261.8 MB in the beginning and 454.2 MB in the end (delta: -192.3 MB). Peak memory consumption was 338.8 MB. Max. memory is 5.3 GB. [2018-01-21 08:50:44,413 INFO L168 Benchmark]: CDTParser took 0.12 ms. Allocated memory is still 302.5 MB. Free memory is still 266.8 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 08:50:44,413 INFO L168 Benchmark]: CACSL2BoogieTranslator took 168.52 ms. Allocated memory is still 302.5 MB. Free memory was 260.8 MB in the beginning and 253.7 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. [2018-01-21 08:50:44,413 INFO L168 Benchmark]: Boogie Preprocessor took 29.53 ms. Allocated memory is still 302.5 MB. Free memory was 253.7 MB in the beginning and 251.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-21 08:50:44,413 INFO L168 Benchmark]: RCFGBuilder took 182.93 ms. Allocated memory is still 302.5 MB. Free memory was 251.7 MB in the beginning and 240.1 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. [2018-01-21 08:50:44,414 INFO L168 Benchmark]: TraceAbstraction took 52918.10 ms. Allocated memory was 302.5 MB in the beginning and 833.6 MB in the end (delta: 531.1 MB). Free memory was 239.1 MB in the beginning and 454.2 MB in the end (delta: -215.1 MB). Peak memory consumption was 316.0 MB. Max. memory is 5.3 GB. [2018-01-21 08:50:44,415 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.12 ms. Allocated memory is still 302.5 MB. Free memory is still 266.8 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 168.52 ms. Allocated memory is still 302.5 MB. Free memory was 260.8 MB in the beginning and 253.7 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 29.53 ms. Allocated memory is still 302.5 MB. Free memory was 253.7 MB in the beginning and 251.7 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 182.93 ms. Allocated memory is still 302.5 MB. Free memory was 251.7 MB in the beginning and 240.1 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 52918.10 ms. Allocated memory was 302.5 MB in the beginning and 833.6 MB in the end (delta: 531.1 MB). Free memory was 239.1 MB in the beginning and 454.2 MB in the end (delta: -215.1 MB). Peak memory consumption was 316.0 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 18 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 126 LocStat_NO_SUPPORTING_DISEQUALITIES : 29 LocStat_NO_DISJUNCTIONS : -36 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 25 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 35 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 25 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.183611 RENAME_VARIABLES(MILLISECONDS) : 0.082131 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.138819 PROJECTAWAY(MILLISECONDS) : 0.062466 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.098961 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.115579 ADD_EQUALITY(MILLISECONDS) : 0.032016 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.012754 #CONJOIN_DISJUNCTIVE : 34 #RENAME_VARIABLES : 64 #UNFREEZE : 0 #CONJOIN : 64 #PROJECTAWAY : 66 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 64 #ADD_EQUALITY : 35 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. UNSAFE Result, 0.1s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 54 with TraceHistMax 35, while TraceCheckSpWp was constructing backward predicates, while PredicateComparison was comparing new predicate (quantifier-free) to 77 known predicates. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 52.6s OverallTime, 36 OverallIterations, 35 TraceHistogramMax, 2.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 598 SDtfs, 114 SDslu, 10903 SDs, 0 SdLazy, 2432 SolverSat, 131 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5530 GetRequests, 3436 SyntacticMatches, 68 SemanticMatches, 2026 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63597 ImplicationChecksByTransitivity, 31.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=54occurred in iteration=35, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.8s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 35 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 2.7s SatisfiabilityAnalysisTime, 43.6s InterpolantComputationTime, 3639 NumberOfCodeBlocks, 3639 NumberOfCodeBlocksAsserted, 421 NumberOfCheckSat, 5882 ConstructedInterpolants, 0 QuantifiedInterpolants, 908650 SizeOfPredicates, 68 NumberOfNonLiveVariables, 7990 ConjunctsInSsa, 1394 ConjunctsInUnsatCore, 171 InterpolantComputations, 1 PerfectInterpolantSequences, 0/35700 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 25]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 25). Cancelled while IsEmpty was searching accepting run (input had 22 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-21_08-50-44-424.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-21_08-50-44-424.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-21_08-50-44-424.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-21_08-50-44-424.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-21_08-50-44-424.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_true-valid-memsafety_true-termination.c_mempurity-32bit-Automizer_Taipan+AI_EQ_preciseopt.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-21_08-50-44-424.csv Completed graceful shutdown