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.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:46:14,212 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:46:14,214 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:46:14,231 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:46:14,231 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:46:14,232 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:46:14,233 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:46:14,235 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:46:14,237 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:46:14,238 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:46:14,239 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:46:14,239 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:46:14,240 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:46:14,242 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:46:14,243 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:46:14,245 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:46:14,248 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:46:14,250 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:46:14,251 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:46:14,252 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:46:14,254 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-20 23:46:14,255 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-20 23:46:14,255 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-20 23:46:14,256 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-20 23:46:14,257 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-20 23:46:14,258 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-20 23:46:14,258 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-20 23:46:14,259 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-20 23:46:14,259 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-20 23:46:14,259 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:46:14,260 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:46:14,260 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.epf [2018-01-20 23:46:14,270 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:46:14,271 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:46:14,271 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:46:14,272 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:46:14,272 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:46:14,272 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:46:14,272 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:46:14,273 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:46:14,273 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:46:14,273 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:46:14,273 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:46:14,274 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:46:14,275 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:46:14,275 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:46:14,275 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:46:14,275 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:46:14,275 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:46:14,276 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:46:14,276 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:46:14,276 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:46:14,276 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:46:14,276 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:46:14,277 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:46:14,278 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:46:14,278 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:46:14,278 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:46:14,279 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:46:14,279 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:46:14,314 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:46:14,326 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:46:14,330 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:46:14,331 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:46:14,332 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:46:14,333 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c [2018-01-20 23:46:14,445 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:46:14,449 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:46:14,450 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:46:14,450 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:46:14,457 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:46:14,459 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,461 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1079723b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,461 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,474 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:46:14,492 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:46:14,603 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:46:14,624 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:46:14,631 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14 WrapperNode [2018-01-20 23:46:14,631 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:46:14,632 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:46:14,632 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:46:14,632 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:46:14,646 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,646 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,654 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,654 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,657 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,661 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,662 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (1/1) ... [2018-01-20 23:46:14,663 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:46:14,664 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:46:14,664 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:46:14,664 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:46:14,665 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (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 [2018-01-20 23:46:14,721 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:46:14,721 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:46:14,721 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:46:14,721 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:46:14,722 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:46:14,723 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:46:14,723 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:46:14,933 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:46:14,935 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:46:14 BoogieIcfgContainer [2018-01-20 23:46:14,935 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:46:14,936 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:46:14,936 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:46:14,939 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:46:14,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:46:14" (1/3) ... [2018-01-20 23:46:14,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ecc74ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:46:14" (2/3) ... [2018-01-20 23:46:14,941 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ecc74ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.01 11:46:14, skipping insertion in model container [2018-01-20 23:46:14,941 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:46:14" (3/3) ... [2018-01-20 23:46:14,943 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-write.c [2018-01-20 23:46:14,952 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:46:14,959 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:46:14,999 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:14,999 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:14,999 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:14,999 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:15,000 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:15,000 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:15,000 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:15,000 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:46:15,001 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:15,019 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:46:15,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:46:15,025 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,026 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:46:15,026 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:46:15,030 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-20 23:46:15,033 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,074 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,074 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,074 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,074 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:46:15,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:46:15,131 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:46:15,137 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:46:15,143 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:15,143 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:15,143 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:15,144 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:15,144 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:15,144 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:15,144 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:15,144 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:46:15,144 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:15,146 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:46:15,147 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:46:15,148 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,148 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,148 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:46:15,148 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-20 23:46:15,149 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,150 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,150 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,150 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,180 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,216 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,218 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,218 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:46:15,218 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,220 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:46:15,231 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:46:15,232 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,234 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-20 23:46:15,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,258 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-20 23:46:15,259 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:46:15,260 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:46:15,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,267 INFO L225 Difference]: With dead ends: 78 [2018-01-20 23:46:15,268 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:46:15,271 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:46:15,361 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:46:15,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:46:15,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:46:15,365 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:46:15,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,366 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:46:15,366 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:46:15,366 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:46:15,366 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:46:15,369 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:46:15,369 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:46:15,369 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:46:15,369 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:46:15,370 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:46:15,370 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:46:15,370 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:46:15,370 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:46:15,370 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:46:15,372 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:46:15,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:46:15,374 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,374 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,374 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-20 23:46:15,374 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,376 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,376 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,376 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,376 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,386 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,398 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,399 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,399 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:46:15,399 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,399 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:46:15,399 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:46:15,399 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,400 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-20 23:46:15,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,405 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-20 23:46:15,405 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:46:15,405 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:46:15,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,407 INFO L225 Difference]: With dead ends: 78 [2018-01-20 23:46:15,408 INFO L226 Difference]: Without dead ends: 40 [2018-01-20 23:46:15,408 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:46:15,408 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-20 23:46:15,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-20 23:46:15,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-20 23:46:15,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-20 23:46:15,419 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-20 23:46:15,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,419 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-20 23:46:15,419 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:46:15,419 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-20 23:46:15,420 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:46:15,420 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,420 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,420 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,420 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-20 23:46:15,420 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,421 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,421 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,422 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,422 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,435 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,465 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,466 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:46:15,466 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:46:15,466 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:15,468 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:46:15,468 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:46:15,468 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:46:15,469 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-20 23:46:15,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:15,532 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-20 23:46:15,533 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:46:15,533 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:46:15,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:15,536 INFO L225 Difference]: With dead ends: 73 [2018-01-20 23:46:15,537 INFO L226 Difference]: Without dead ends: 57 [2018-01-20 23:46:15,538 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:46:15,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-20 23:46:15,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-20 23:46:15,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-20 23:46:15,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-20 23:46:15,552 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-20 23:46:15,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:15,552 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-20 23:46:15,552 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:46:15,552 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-20 23:46:15,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-20 23:46:15,553 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:15,554 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:15,554 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:15,554 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-20 23:46:15,554 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:15,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,555 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:15,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:15,555 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:15,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:15,577 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:15,642 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:15,642 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:15,642 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:15,643 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-20 23:46:15,645 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-20 23:46:15,691 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:46:15,692 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:46:16,431 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:46:16,433 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-20 23:46:16,446 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:46:16,446 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:16,447 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 [2018-01-20 23:46:16,455 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:16,455 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:16,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:16,488 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:16,552 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:16,552 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:16,785 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:46:16,821 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:46:16,821 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 8 [2018-01-20 23:46:16,821 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:46:16,822 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:46:16,822 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:46:16,822 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-01-20 23:46:16,822 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-20 23:46:16,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:16,935 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-20 23:46:16,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:46:16,935 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-20 23:46:16,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:16,936 INFO L225 Difference]: With dead ends: 86 [2018-01-20 23:46:16,937 INFO L226 Difference]: Without dead ends: 49 [2018-01-20 23:46:16,937 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-01-20 23:46:16,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-20 23:46:16,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-01-20 23:46:16,941 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-20 23:46:16,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-01-20 23:46:16,942 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 34 [2018-01-20 23:46:16,942 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:16,942 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-01-20 23:46:16,942 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:46:16,942 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-01-20 23:46:16,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-20 23:46:16,943 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:16,944 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:16,944 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:16,944 INFO L82 PathProgramCache]: Analyzing trace with hash 2113336574, now seen corresponding path program 1 times [2018-01-20 23:46:16,944 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:16,945 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:16,945 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:16,945 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:16,945 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:16,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:16,962 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:17,006 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,007 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,007 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:17,007 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-20 23:46:17,008 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-20 23:46:17,010 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:46:17,010 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:46:17,582 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:46:17,582 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-20 23:46:17,596 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:46:17,596 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,596 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:17,607 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:17,607 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:17,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:17,633 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:17,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,647 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:17,685 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,720 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:17,720 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:17,731 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:17,731 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:17,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:17,790 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:17,796 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,796 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:17,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-20 23:46:17,835 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:17,836 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-20 23:46:17,836 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:17,837 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:46:17,837 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:46:17,837 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:46:17,837 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 5 states. [2018-01-20 23:46:17,945 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:17,946 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-20 23:46:17,946 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:46:17,946 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-20 23:46:17,947 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:17,948 INFO L225 Difference]: With dead ends: 94 [2018-01-20 23:46:17,948 INFO L226 Difference]: Without dead ends: 76 [2018-01-20 23:46:17,949 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:46:17,949 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-20 23:46:17,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-01-20 23:46:17,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-20 23:46:17,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-01-20 23:46:17,956 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 39 [2018-01-20 23:46:17,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:17,957 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-01-20 23:46:17,957 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:46:17,957 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-01-20 23:46:17,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-20 23:46:17,960 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:17,960 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:17,960 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:17,960 INFO L82 PathProgramCache]: Analyzing trace with hash -1575876768, now seen corresponding path program 2 times [2018-01-20 23:46:17,960 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:17,961 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,961 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:17,962 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:17,962 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:17,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:17,985 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:18,057 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:18,058 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,058 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:18,058 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:18,058 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:18,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:18,068 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:18,068 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:18,084 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:18,096 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:18,098 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:18,101 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:18,161 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:46:18,162 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:18,416 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-20 23:46:18,437 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,452 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:18,455 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:18,456 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:18,474 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:18,505 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:18,522 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:18,527 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:18,551 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:18,551 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:18,656 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-20 23:46:18,658 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:18,659 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-20 23:46:18,659 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:18,659 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:46:18,660 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:46:18,660 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-20 23:46:18,660 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 10 states. [2018-01-20 23:46:18,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:18,851 INFO L93 Difference]: Finished difference Result 164 states and 184 transitions. [2018-01-20 23:46:18,852 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-20 23:46:18,852 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2018-01-20 23:46:18,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:18,854 INFO L225 Difference]: With dead ends: 164 [2018-01-20 23:46:18,854 INFO L226 Difference]: Without dead ends: 123 [2018-01-20 23:46:18,855 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-20 23:46:18,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-20 23:46:18,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 86. [2018-01-20 23:46:18,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-20 23:46:18,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2018-01-20 23:46:18,866 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 57 [2018-01-20 23:46:18,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:18,867 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2018-01-20 23:46:18,867 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:46:18,867 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2018-01-20 23:46:18,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-20 23:46:18,868 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:18,869 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:18,869 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:18,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1577101506, now seen corresponding path program 3 times [2018-01-20 23:46:18,869 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:18,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:18,870 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:18,870 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:18,870 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:18,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:18,897 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:18,986 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:18,986 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,986 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:18,986 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:18,987 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:18,987 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:18,987 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:18,992 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:18,992 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:19,005 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,009 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,014 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,021 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,022 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:19,026 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:19,052 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:19,053 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:19,142 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:19,169 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,170 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:19,172 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:19,173 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:19,192 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,206 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,228 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,259 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:19,271 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:19,277 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:19,287 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:19,287 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:19,333 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-20 23:46:19,337 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:19,338 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-20 23:46:19,338 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:19,338 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-20 23:46:19,338 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-20 23:46:19,338 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:46:19,339 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand 7 states. [2018-01-20 23:46:19,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:19,413 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-01-20 23:46:19,414 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:46:19,414 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 85 [2018-01-20 23:46:19,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:19,415 INFO L225 Difference]: With dead ends: 154 [2018-01-20 23:46:19,415 INFO L226 Difference]: Without dead ends: 126 [2018-01-20 23:46:19,416 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-20 23:46:19,416 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-20 23:46:19,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-20 23:46:19,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-20 23:46:19,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-01-20 23:46:19,428 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 85 [2018-01-20 23:46:19,428 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:19,428 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-01-20 23:46:19,428 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-20 23:46:19,428 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-01-20 23:46:19,430 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-01-20 23:46:19,430 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:19,430 INFO L322 BasicCegarLoop]: trace histogram [11, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:19,430 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:19,430 INFO L82 PathProgramCache]: Analyzing trace with hash 1323929276, now seen corresponding path program 4 times [2018-01-20 23:46:19,430 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:19,431 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:19,431 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:19,431 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:19,431 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:19,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:19,461 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:19,597 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2018-01-20 23:46:19,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,597 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:19,597 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:19,597 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:19,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:19,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:19,605 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:19,605 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:19,640 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:19,644 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:19,749 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-20 23:46:19,749 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:20,074 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-20 23:46:20,096 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,096 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:20,101 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:20,101 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:20,145 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:20,150 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:20,168 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-20 23:46:20,169 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:20,343 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-20 23:46:20,344 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:20,345 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-20 23:46:20,345 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:20,345 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-20 23:46:20,345 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-20 23:46:20,345 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:46:20,346 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 14 states. [2018-01-20 23:46:20,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:20,602 INFO L93 Difference]: Finished difference Result 262 states and 293 transitions. [2018-01-20 23:46:20,603 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-20 23:46:20,603 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 108 [2018-01-20 23:46:20,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:20,604 INFO L225 Difference]: With dead ends: 262 [2018-01-20 23:46:20,604 INFO L226 Difference]: Without dead ends: 197 [2018-01-20 23:46:20,605 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 412 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2018-01-20 23:46:20,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-20 23:46:20,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 131. [2018-01-20 23:46:20,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-20 23:46:20,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-20 23:46:20,617 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 108 [2018-01-20 23:46:20,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:20,617 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-20 23:46:20,617 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-20 23:46:20,617 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-20 23:46:20,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-20 23:46:20,619 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:20,619 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:20,619 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:20,619 INFO L82 PathProgramCache]: Analyzing trace with hash -481631070, now seen corresponding path program 5 times [2018-01-20 23:46:20,619 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:20,620 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:20,620 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:20,620 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:20,620 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:20,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:20,654 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:20,790 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-20 23:46:20,791 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,791 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:20,791 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:20,791 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:20,791 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:20,791 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:20,796 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:20,796 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:20,807 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,808 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,810 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,817 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,827 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:20,828 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:20,831 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:20,935 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 382 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-01-20 23:46:20,935 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:21,153 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 188 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2018-01-20 23:46:21,173 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:21,173 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:21,176 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:21,176 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:21,189 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,209 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,226 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,266 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,347 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:21,363 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:21,368 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:21,421 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 385 proven. 118 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-01-20 23:46:21,421 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:21,632 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 191 proven. 218 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-01-20 23:46:21,634 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:21,634 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13, 13, 13] total 28 [2018-01-20 23:46:21,635 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:21,635 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-20 23:46:21,635 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-20 23:46:21,636 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2018-01-20 23:46:21,636 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 19 states. [2018-01-20 23:46:22,109 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:22,109 INFO L93 Difference]: Finished difference Result 312 states and 349 transitions. [2018-01-20 23:46:22,109 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-20 23:46:22,109 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 146 [2018-01-20 23:46:22,110 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:22,112 INFO L225 Difference]: With dead ends: 312 [2018-01-20 23:46:22,112 INFO L226 Difference]: Without dead ends: 234 [2018-01-20 23:46:22,113 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 554 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2018-01-20 23:46:22,114 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-01-20 23:46:22,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 169. [2018-01-20 23:46:22,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-01-20 23:46:22,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 188 transitions. [2018-01-20 23:46:22,130 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 188 transitions. Word has length 146 [2018-01-20 23:46:22,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:22,131 INFO L432 AbstractCegarLoop]: Abstraction has 169 states and 188 transitions. [2018-01-20 23:46:22,131 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-20 23:46:22,131 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 188 transitions. [2018-01-20 23:46:22,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-20 23:46:22,133 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:22,134 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:22,134 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:22,134 INFO L82 PathProgramCache]: Analyzing trace with hash -75359012, now seen corresponding path program 6 times [2018-01-20 23:46:22,134 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:22,135 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:22,135 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:22,135 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:22,135 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:22,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:22,169 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:22,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:22,322 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:22,322 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:22,322 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:22,322 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:22,323 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:22,323 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:22,332 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:22,332 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:22,350 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,355 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,360 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,363 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,375 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,383 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,393 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,402 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,403 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:22,408 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:22,446 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:22,446 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:22,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:22,695 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:22,695 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:22,698 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:22,698 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:22,717 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,737 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,750 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,799 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,848 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:22,917 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:23,145 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:23,178 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:23,186 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:23,206 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:23,206 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:23,276 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-20 23:46:23,278 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:23,278 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-20 23:46:23,279 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:23,279 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-20 23:46:23,279 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-20 23:46:23,280 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:46:23,280 INFO L87 Difference]: Start difference. First operand 169 states and 188 transitions. Second operand 10 states. [2018-01-20 23:46:23,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:23,370 INFO L93 Difference]: Finished difference Result 267 states and 298 transitions. [2018-01-20 23:46:23,370 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-20 23:46:23,370 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 189 [2018-01-20 23:46:23,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:23,372 INFO L225 Difference]: With dead ends: 267 [2018-01-20 23:46:23,373 INFO L226 Difference]: Without dead ends: 224 [2018-01-20 23:46:23,373 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:46:23,374 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-01-20 23:46:23,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 181. [2018-01-20 23:46:23,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-20 23:46:23,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2018-01-20 23:46:23,389 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 189 [2018-01-20 23:46:23,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:23,390 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2018-01-20 23:46:23,390 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-20 23:46:23,390 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2018-01-20 23:46:23,393 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-01-20 23:46:23,393 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:23,393 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:23,394 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:23,394 INFO L82 PathProgramCache]: Analyzing trace with hash -520842402, now seen corresponding path program 7 times [2018-01-20 23:46:23,394 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:23,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:23,395 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:23,395 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:23,395 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:23,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:23,434 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:23,651 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-20 23:46:23,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:23,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:23,651 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:23,651 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:23,652 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:23,652 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:23,659 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:23,659 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:23,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:23,720 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:23,876 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-20 23:46:23,876 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:24,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-20 23:46:24,125 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:24,125 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:24,128 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:24,129 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:46:24,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:24,234 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:24,267 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-20 23:46:24,267 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:24,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-20 23:46:24,478 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:24,479 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-20 23:46:24,479 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:24,479 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:46:24,480 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:46:24,480 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-20 23:46:24,480 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand 21 states. [2018-01-20 23:46:24,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:24,873 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2018-01-20 23:46:24,873 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-20 23:46:24,873 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 222 [2018-01-20 23:46:24,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:24,876 INFO L225 Difference]: With dead ends: 470 [2018-01-20 23:46:24,876 INFO L226 Difference]: Without dead ends: 367 [2018-01-20 23:46:24,877 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 858 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:46:24,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-01-20 23:46:24,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 224. [2018-01-20 23:46:24,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2018-01-20 23:46:24,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 251 transitions. [2018-01-20 23:46:24,891 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 251 transitions. Word has length 222 [2018-01-20 23:46:24,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:24,892 INFO L432 AbstractCegarLoop]: Abstraction has 224 states and 251 transitions. [2018-01-20 23:46:24,892 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:46:24,892 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 251 transitions. [2018-01-20 23:46:24,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-20 23:46:24,894 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:24,894 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:24,894 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:24,894 INFO L82 PathProgramCache]: Analyzing trace with hash -1579608284, now seen corresponding path program 8 times [2018-01-20 23:46:24,895 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:24,895 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:24,895 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:46:24,895 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:24,896 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:24,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:24,922 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:25,106 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-20 23:46:25,106 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:25,106 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:25,107 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:25,107 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:25,107 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:25,107 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:25,112 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:25,113 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:25,132 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:25,161 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:25,166 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:25,171 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:25,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-20 23:46:25,354 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:25,613 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-20 23:46:25,633 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:25,634 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:25,636 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:46:25,637 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:25,659 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:25,712 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:25,753 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:25,763 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:25,813 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-20 23:46:25,814 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:26,065 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-20 23:46:26,066 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:26,066 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-20 23:46:26,067 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:26,067 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-20 23:46:26,067 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-20 23:46:26,068 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:46:26,068 INFO L87 Difference]: Start difference. First operand 224 states and 251 transitions. Second operand 24 states. [2018-01-20 23:46:26,700 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:26,700 INFO L93 Difference]: Finished difference Result 579 states and 648 transitions. [2018-01-20 23:46:26,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-20 23:46:26,700 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-01-20 23:46:26,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:26,704 INFO L225 Difference]: With dead ends: 579 [2018-01-20 23:46:26,704 INFO L226 Difference]: Without dead ends: 463 [2018-01-20 23:46:26,705 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 1065 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-20 23:46:26,705 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-20 23:46:26,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 272. [2018-01-20 23:46:26,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-01-20 23:46:26,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 306 transitions. [2018-01-20 23:46:26,722 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 306 transitions. Word has length 275 [2018-01-20 23:46:26,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:26,722 INFO L432 AbstractCegarLoop]: Abstraction has 272 states and 306 transitions. [2018-01-20 23:46:26,723 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-20 23:46:26,723 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 306 transitions. [2018-01-20 23:46:26,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-20 23:46:26,729 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:26,729 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:26,729 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:26,729 INFO L82 PathProgramCache]: Analyzing trace with hash -1321832962, now seen corresponding path program 9 times [2018-01-20 23:46:26,730 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:26,730 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:26,730 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:26,731 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:26,731 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:26,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:26,775 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:27,097 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-20 23:46:27,097 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:27,097 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:27,097 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:27,097 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:27,097 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:27,098 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:27,102 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:27,103 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:27,123 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,127 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,130 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,134 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,140 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,147 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,152 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,159 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,160 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:27,164 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:27,301 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-20 23:46:27,301 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:27,680 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-20 23:46:27,702 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:27,702 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:27,706 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:46:27,706 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:46:27,749 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,763 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,787 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,821 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:27,942 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:28,060 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:28,342 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:46:28,379 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:28,387 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:28,439 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-20 23:46:28,440 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:28,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-20 23:46:28,758 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:28,758 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-20 23:46:28,759 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:28,759 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-20 23:46:28,760 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-20 23:46:28,760 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-20 23:46:28,760 INFO L87 Difference]: Start difference. First operand 272 states and 306 transitions. Second operand 20 states. [2018-01-20 23:46:29,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:29,102 INFO L93 Difference]: Finished difference Result 669 states and 759 transitions. [2018-01-20 23:46:29,103 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-20 23:46:29,103 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 333 [2018-01-20 23:46:29,103 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:29,106 INFO L225 Difference]: With dead ends: 669 [2018-01-20 23:46:29,106 INFO L226 Difference]: Without dead ends: 611 [2018-01-20 23:46:29,107 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1349 GetRequests, 1312 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-20 23:46:29,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2018-01-20 23:46:29,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 333. [2018-01-20 23:46:29,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-01-20 23:46:29,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 380 transitions. [2018-01-20 23:46:29,129 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 380 transitions. Word has length 333 [2018-01-20 23:46:29,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:29,129 INFO L432 AbstractCegarLoop]: Abstraction has 333 states and 380 transitions. [2018-01-20 23:46:29,129 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-20 23:46:29,129 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 380 transitions. [2018-01-20 23:46:29,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-01-20 23:46:29,131 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:29,131 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:29,131 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:29,132 INFO L82 PathProgramCache]: Analyzing trace with hash -626287868, now seen corresponding path program 10 times [2018-01-20 23:46:29,132 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:29,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:29,133 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:29,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:29,133 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:29,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:29,167 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:29,489 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-20 23:46:29,490 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:29,490 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:29,490 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:29,490 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:29,490 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:29,490 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:29,495 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:29,495 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:29,560 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:29,564 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:29,789 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-20 23:46:29,789 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:30,267 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-20 23:46:30,289 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:30,289 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:30,292 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:46:30,292 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:46:30,429 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:30,441 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:30,524 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-20 23:46:30,524 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:30,808 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-20 23:46:30,810 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:30,810 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-20 23:46:30,810 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:30,811 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-20 23:46:30,811 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-20 23:46:30,812 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-20 23:46:30,812 INFO L87 Difference]: Start difference. First operand 333 states and 380 transitions. Second operand 30 states. [2018-01-20 23:46:31,541 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:31,541 INFO L93 Difference]: Finished difference Result 877 states and 999 transitions. [2018-01-20 23:46:31,541 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-20 23:46:31,541 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 396 [2018-01-20 23:46:31,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:31,545 INFO L225 Difference]: With dead ends: 877 [2018-01-20 23:46:31,545 INFO L226 Difference]: Without dead ends: 721 [2018-01-20 23:46:31,547 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1613 GetRequests, 1539 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-20 23:46:31,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2018-01-20 23:46:31,566 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 391. [2018-01-20 23:46:31,566 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-01-20 23:46:31,568 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2018-01-20 23:46:31,569 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 396 [2018-01-20 23:46:31,569 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:31,569 INFO L432 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2018-01-20 23:46:31,569 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-20 23:46:31,570 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2018-01-20 23:46:31,572 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2018-01-20 23:46:31,572 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:31,572 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:31,572 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:31,572 INFO L82 PathProgramCache]: Analyzing trace with hash 91735614, now seen corresponding path program 11 times [2018-01-20 23:46:31,572 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:31,573 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:31,573 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:31,573 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:31,573 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:31,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:31,609 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:32,207 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-20 23:46:32,208 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:32,208 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:32,208 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:32,208 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:32,208 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:32,208 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:32,216 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:32,216 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:32,251 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,257 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,265 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,274 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,285 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,293 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,301 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,311 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:32,312 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:32,319 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:32,675 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-20 23:46:32,675 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:33,777 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-20 23:46:33,798 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:33,798 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:33,801 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:46:33,801 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:46:33,845 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:33,862 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:33,896 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:33,940 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:34,046 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:35,711 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:40,274 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:40,602 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:46:40,648 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:40,658 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:40,773 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-20 23:46:40,774 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:41,085 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-20 23:46:41,088 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:46:41,089 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 40 [2018-01-20 23:46:41,089 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:46:41,089 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-20 23:46:41,089 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-20 23:46:41,090 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:46:41,090 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand 31 states. [2018-01-20 23:46:42,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:46:42,910 INFO L93 Difference]: Finished difference Result 966 states and 1091 transitions. [2018-01-20 23:46:42,911 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-20 23:46:42,911 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 459 [2018-01-20 23:46:42,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:46:42,913 INFO L225 Difference]: With dead ends: 966 [2018-01-20 23:46:42,913 INFO L226 Difference]: Without dead ends: 554 [2018-01-20 23:46:42,916 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1888 GetRequests, 1801 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-20 23:46:42,916 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-01-20 23:46:42,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 395. [2018-01-20 23:46:42,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2018-01-20 23:46:42,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 440 transitions. [2018-01-20 23:46:42,934 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 440 transitions. Word has length 459 [2018-01-20 23:46:42,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:46:42,935 INFO L432 AbstractCegarLoop]: Abstraction has 395 states and 440 transitions. [2018-01-20 23:46:42,935 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-20 23:46:42,935 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 440 transitions. [2018-01-20 23:46:42,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-01-20 23:46:42,937 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:46:42,938 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:46:42,938 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:46:42,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1309279644, now seen corresponding path program 12 times [2018-01-20 23:46:42,938 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:46:42,939 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:42,939 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:46:42,939 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:46:42,939 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:46:42,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:46:42,976 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:46:43,561 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-20 23:46:43,561 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:43,561 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:46:43,561 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:46:43,562 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:46:43,562 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:43,562 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:46:43,569 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:43,569 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:43,604 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,610 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,615 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,632 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,639 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,649 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,661 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,675 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,698 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,721 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,736 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,756 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,770 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,784 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,803 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,819 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,871 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,899 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,946 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:43,948 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:46:43,957 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:46:44,273 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-20 23:46:44,274 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:46:45,014 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-20 23:46:45,048 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:46:45,049 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:46:45,055 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:46:45,056 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:46:45,103 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:45,118 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:45,158 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:45,221 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:46:51,120 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:47:03,152 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown