java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:06:30,291 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:06:30,293 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:06:30,308 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:06:30,308 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:06:30,309 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:06:30,310 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:06:30,312 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:06:30,314 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:06:30,315 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:06:30,316 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:06:30,316 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:06:30,317 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:06:30,318 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:06:30,319 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:06:30,321 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:06:30,323 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:06:30,325 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:06:30,327 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:06:30,328 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:06:30,330 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:06:30,330 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:06:30,330 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:06:30,332 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:06:30,332 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:06:30,334 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:06:30,334 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:06:30,335 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:06:30,335 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:06:30,335 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:06:30,336 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:06:30,336 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf [2018-01-21 06:06:30,344 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:06:30,345 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:06:30,345 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:06:30,345 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:06:30,346 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:06:30,346 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:06:30,346 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:06:30,346 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:06:30,346 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:06:30,347 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:06:30,348 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:06:30,348 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:06:30,348 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:06:30,348 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:06:30,348 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:06:30,348 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:06:30,349 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:06:30,349 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:06:30,349 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:06:30,349 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:06:30,349 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:06:30,349 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:06:30,350 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:06:30,351 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:06:30,351 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:06:30,383 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:06:30,393 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:06:30,396 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:06:30,397 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:06:30,398 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:06:30,398 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 06:06:30,500 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:06:30,504 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:06:30,504 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:06:30,504 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:06:30,509 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:06:30,510 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,513 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2932481 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30, skipping insertion in model container [2018-01-21 06:06:30,513 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,525 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:06:30,538 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:06:30,646 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:06:30,662 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:06:30,668 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30 WrapperNode [2018-01-21 06:06:30,668 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:06:30,669 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:06:30,669 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:06:30,669 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:06:30,680 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,680 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,688 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,688 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,692 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,696 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,697 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... [2018-01-21 06:06:30,699 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:06:30,700 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:06:30,700 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:06:30,700 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:06:30,701 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:06:30,746 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:06:30,746 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:06:30,746 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:06:30,747 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:06:30,747 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:06:30,747 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:06:30,747 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:06:30,747 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:06:30,747 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:06:30,748 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:06:30,748 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:06:30,748 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:06:30,748 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:06:30,945 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:06:30,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:06:30 BoogieIcfgContainer [2018-01-21 06:06:30,946 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:06:30,947 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:06:30,947 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:06:30,950 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:06:30,950 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:06:30" (1/3) ... [2018-01-21 06:06:30,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e541bd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:06:30, skipping insertion in model container [2018-01-21 06:06:30,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:06:30" (2/3) ... [2018-01-21 06:06:30,951 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3e541bd7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:06:30, skipping insertion in model container [2018-01-21 06:06:30,951 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:06:30" (3/3) ... [2018-01-21 06:06:30,953 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_true-valid-memsafety.c [2018-01-21 06:06:30,960 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:06:30,965 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:06:31,003 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:31,003 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:31,004 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:31,004 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:31,004 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:31,004 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:31,004 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:31,004 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:06:31,005 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:31,027 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:06:31,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:06:31,033 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:31,034 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:06:31,034 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:06:31,039 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 06:06:31,042 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:31,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,089 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:31,089 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,090 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:31,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:06:31,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:06:31,135 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:06:31,141 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:06:31,146 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:31,146 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:31,146 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:31,146 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:31,146 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:31,146 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:31,146 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:31,147 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:06:31,147 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:31,148 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:06:31,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:06:31,149 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:31,149 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:31,149 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:06:31,150 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 06:06:31,150 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:31,151 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,151 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:31,151 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,151 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:31,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:31,175 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:31,206 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:31,207 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:31,208 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:06:31,208 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:31,209 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:06:31,219 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:06:31,220 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:31,222 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 06:06:31,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:31,250 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 06:06:31,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:06:31,252 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:06:31,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:31,260 INFO L225 Difference]: With dead ends: 78 [2018-01-21 06:06:31,260 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:06:31,264 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:31,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:06:31,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:06:31,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:06:31,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:06:31,363 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:06:31,363 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:31,363 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:06:31,363 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:06:31,364 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:06:31,364 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:06:31,366 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:06:31,366 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:06:31,366 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:06:31,366 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:06:31,366 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:06:31,366 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:06:31,366 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:06:31,366 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:06:31,367 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:06:31,368 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:06:31,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:06:31,369 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:31,369 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:31,369 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:31,369 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 06:06:31,370 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:31,370 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,371 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:31,371 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,371 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:31,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:31,377 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:31,387 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:31,388 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:31,388 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:06:31,388 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:31,388 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:06:31,388 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:06:31,388 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:31,389 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 06:06:31,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:31,394 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 06:06:31,394 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:06:31,394 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:06:31,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:31,396 INFO L225 Difference]: With dead ends: 78 [2018-01-21 06:06:31,396 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 06:06:31,397 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:06:31,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 06:06:31,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 06:06:31,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 06:06:31,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 06:06:31,408 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 06:06:31,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:31,408 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 06:06:31,408 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:06:31,408 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 06:06:31,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:06:31,409 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:31,409 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:31,409 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:31,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 06:06:31,409 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:31,410 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,410 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:31,410 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,410 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:31,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:31,423 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:31,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:31,454 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:06:31,454 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:06:31,454 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:31,456 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:06:31,456 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:06:31,456 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:06:31,456 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 06:06:31,505 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:31,506 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 06:06:31,506 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:06:31,506 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:06:31,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:31,510 INFO L225 Difference]: With dead ends: 73 [2018-01-21 06:06:31,510 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 06:06:31,511 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:06:31,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 06:06:31,521 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 06:06:31,522 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 06:06:31,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 06:06:31,523 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 06:06:31,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:31,524 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 06:06:31,524 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:06:31,524 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 06:06:31,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 06:06:31,525 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:31,525 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:31,526 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:31,526 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 06:06:31,526 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:31,527 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,527 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:31,527 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:31,527 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:31,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:31,545 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:31,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:31,602 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:31,603 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:31,604 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 06:06:31,606 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] [2018-01-21 06:06:31,647 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:06:31,647 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:06:33,154 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:06:33,156 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. [2018-01-21 06:06:33,163 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:06:33,163 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:33,163 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:33,175 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:33,175 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:33,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:33,213 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:33,293 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:33,293 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:33,397 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:33,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:33,420 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:33,424 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:33,424 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:33,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:33,464 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:33,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:33,471 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:33,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:06:33,509 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:33,509 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 06:06:33,509 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:33,511 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:06:33,511 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:06:33,512 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:06:33,512 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 06:06:33,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:33,620 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2018-01-21 06:06:33,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:06:33,621 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 06:06:33,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:33,623 INFO L225 Difference]: With dead ends: 92 [2018-01-21 06:06:33,623 INFO L226 Difference]: Without dead ends: 74 [2018-01-21 06:06:33,624 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 138 GetRequests, 133 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:06:33,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-01-21 06:06:33,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2018-01-21 06:06:33,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-21 06:06:33,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-01-21 06:06:33,632 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 34 [2018-01-21 06:06:33,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:33,632 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-01-21 06:06:33,632 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:06:33,632 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-01-21 06:06:33,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 06:06:33,635 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:33,635 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:33,635 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:33,635 INFO L82 PathProgramCache]: Analyzing trace with hash 284082524, now seen corresponding path program 2 times [2018-01-21 06:06:33,636 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:33,637 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:33,637 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:33,637 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:33,637 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:33,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:33,657 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:33,709 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 06:06:33,710 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:33,710 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:33,710 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:33,710 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:33,710 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:33,710 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:33,721 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:33,721 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:33,740 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:33,761 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:33,762 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:33,765 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:33,824 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 06:06:33,825 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:33,956 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 06:06:33,977 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:06:33,977 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 06:06:33,978 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:06:33,978 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:06:33,978 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:06:33,978 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 06:06:33,978 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 6 states. [2018-01-21 06:06:34,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:34,140 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2018-01-21 06:06:34,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:06:34,141 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 06:06:34,141 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:34,142 INFO L225 Difference]: With dead ends: 108 [2018-01-21 06:06:34,142 INFO L226 Difference]: Without dead ends: 69 [2018-01-21 06:06:34,143 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 86 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:06:34,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-21 06:06:34,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2018-01-21 06:06:34,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-01-21 06:06:34,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2018-01-21 06:06:34,151 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 47 [2018-01-21 06:06:34,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:34,151 INFO L432 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2018-01-21 06:06:34,151 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:06:34,151 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2018-01-21 06:06:34,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 06:06:34,153 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:34,153 INFO L322 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:34,153 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:34,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1139762048, now seen corresponding path program 1 times [2018-01-21 06:06:34,153 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:34,154 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:34,154 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:34,154 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:34,155 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:34,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:34,175 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:34,226 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:06:34,226 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:34,226 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:34,227 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-21 06:06:34,227 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] [2018-01-21 06:06:34,228 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:06:34,229 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:06:35,135 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:06:35,136 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 06:06:35,143 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:06:35,143 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:35,143 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:35,158 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:35,158 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:35,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:35,188 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:35,237 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:06:35,238 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:35,306 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:06:35,327 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:35,327 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:35,330 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:35,331 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:35,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:35,376 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:35,383 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:06:35,383 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:35,427 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:06:35,429 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:35,429 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 06:06:35,430 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:35,430 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:06:35,430 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:06:35,430 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:06:35,431 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 6 states. [2018-01-21 06:06:35,496 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:35,496 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-01-21 06:06:35,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:06:35,496 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-21 06:06:35,497 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:35,498 INFO L225 Difference]: With dead ends: 119 [2018-01-21 06:06:35,498 INFO L226 Difference]: Without dead ends: 96 [2018-01-21 06:06:35,499 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 204 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:06:35,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-01-21 06:06:35,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 73. [2018-01-21 06:06:35,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-01-21 06:06:35,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2018-01-21 06:06:35,509 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 52 [2018-01-21 06:06:35,509 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:35,509 INFO L432 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2018-01-21 06:06:35,510 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:06:35,510 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2018-01-21 06:06:35,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-01-21 06:06:35,511 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:35,511 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:35,512 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:35,512 INFO L82 PathProgramCache]: Analyzing trace with hash -2110418334, now seen corresponding path program 2 times [2018-01-21 06:06:35,512 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:35,513 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:35,513 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:35,513 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:35,513 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:35,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:35,538 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:35,651 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:06:35,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:35,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:35,651 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:35,651 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:35,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:35,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:35,660 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:35,660 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:35,673 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:35,698 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:35,700 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:35,704 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:35,784 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 06:06:35,785 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:36,026 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 06:06:36,047 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:36,047 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:36,050 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:36,050 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:36,063 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:36,081 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:36,094 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:36,099 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:36,119 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:06:36,120 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:36,190 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:06:36,192 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:36,192 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 06:06:36,192 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:36,193 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:06:36,193 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:06:36,194 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:06:36,194 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand 12 states. [2018-01-21 06:06:36,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:36,484 INFO L93 Difference]: Finished difference Result 192 states and 218 transitions. [2018-01-21 06:06:36,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:06:36,484 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2018-01-21 06:06:36,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:36,486 INFO L225 Difference]: With dead ends: 192 [2018-01-21 06:06:36,486 INFO L226 Difference]: Without dead ends: 143 [2018-01-21 06:06:36,487 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:06:36,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-21 06:06:36,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2018-01-21 06:06:36,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-21 06:06:36,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2018-01-21 06:06:36,501 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 70 [2018-01-21 06:06:36,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:36,501 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2018-01-21 06:06:36,501 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:06:36,501 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2018-01-21 06:06:36,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-01-21 06:06:36,503 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:36,504 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:36,504 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:36,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1934895936, now seen corresponding path program 3 times [2018-01-21 06:06:36,504 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:36,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,505 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:36,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:36,505 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:36,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:36,532 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:36,640 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 06:06:36,640 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:36,641 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:36,641 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:36,641 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:36,641 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:36,641 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:36,649 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:36,649 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:36,664 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,670 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,674 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,679 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,681 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:36,683 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:36,717 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 06:06:36,717 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:36,841 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 06:06:36,861 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:36,862 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:36,865 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:36,865 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:36,877 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,886 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,901 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,927 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:36,939 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:36,944 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:36,955 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 06:06:36,955 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:37,038 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-21 06:06:37,040 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:37,040 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 06:06:37,040 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:37,041 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 06:06:37,041 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 06:06:37,041 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:06:37,041 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 11 states. [2018-01-21 06:06:37,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:37,223 INFO L93 Difference]: Finished difference Result 239 states and 273 transitions. [2018-01-21 06:06:37,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:06:37,223 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 98 [2018-01-21 06:06:37,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:37,224 INFO L225 Difference]: With dead ends: 239 [2018-01-21 06:06:37,225 INFO L226 Difference]: Without dead ends: 206 [2018-01-21 06:06:37,225 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 380 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:06:37,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-01-21 06:06:37,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 142. [2018-01-21 06:06:37,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-21 06:06:37,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 162 transitions. [2018-01-21 06:06:37,238 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 162 transitions. Word has length 98 [2018-01-21 06:06:37,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:37,238 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 162 transitions. [2018-01-21 06:06:37,238 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 06:06:37,238 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 162 transitions. [2018-01-21 06:06:37,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-01-21 06:06:37,240 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:37,240 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:37,240 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:37,241 INFO L82 PathProgramCache]: Analyzing trace with hash -883540994, now seen corresponding path program 4 times [2018-01-21 06:06:37,241 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:37,241 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:37,241 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:37,241 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:37,241 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:37,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:37,273 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:37,383 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 06:06:37,383 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:37,383 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:37,383 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:37,384 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:37,384 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:37,384 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:37,391 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:37,391 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:37,423 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:37,426 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:37,753 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:06:37,753 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:38,020 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:06:38,041 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:38,041 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:38,044 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:38,045 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:38,100 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:38,106 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:38,129 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:06:38,130 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:38,309 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:06:38,311 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:38,343 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 06:06:38,343 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:38,344 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:06:38,344 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:06:38,344 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:06:38,344 INFO L87 Difference]: Start difference. First operand 142 states and 162 transitions. Second operand 18 states. [2018-01-21 06:06:38,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:38,869 INFO L93 Difference]: Finished difference Result 371 states and 427 transitions. [2018-01-21 06:06:38,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:06:38,869 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-01-21 06:06:38,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:38,872 INFO L225 Difference]: With dead ends: 371 [2018-01-21 06:06:38,872 INFO L226 Difference]: Without dead ends: 283 [2018-01-21 06:06:38,873 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 496 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 06:06:38,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-01-21 06:06:38,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 180. [2018-01-21 06:06:38,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 06:06:38,890 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-01-21 06:06:38,890 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 131 [2018-01-21 06:06:38,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:38,891 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-01-21 06:06:38,891 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:06:38,891 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-01-21 06:06:38,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-01-21 06:06:38,894 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:38,894 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:38,894 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:38,894 INFO L82 PathProgramCache]: Analyzing trace with hash 1207261824, now seen corresponding path program 5 times [2018-01-21 06:06:38,894 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:38,895 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:38,895 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:38,896 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:38,896 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:38,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:38,925 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:39,077 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 06:06:39,078 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:39,078 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:39,078 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:39,078 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:39,078 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:39,078 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:39,084 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:39,084 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:39,096 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,100 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,104 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,108 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,113 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,119 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,120 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:39,123 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:39,205 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 06:06:39,206 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:39,422 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 06:06:39,443 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:39,443 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:39,446 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:39,446 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:39,458 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,463 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,475 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,490 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,513 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,915 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:39,946 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:39,954 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:39,979 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-21 06:06:39,979 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:40,131 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-21 06:06:40,133 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:40,133 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 06:06:40,133 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:40,134 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:06:40,134 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:06:40,134 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:06:40,134 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 18 states. [2018-01-21 06:06:40,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:40,566 INFO L93 Difference]: Finished difference Result 418 states and 475 transitions. [2018-01-21 06:06:40,566 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:06:40,566 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 164 [2018-01-21 06:06:40,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:40,567 INFO L225 Difference]: With dead ends: 418 [2018-01-21 06:06:40,567 INFO L226 Difference]: Without dead ends: 249 [2018-01-21 06:06:40,568 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 635 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 06:06:40,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-01-21 06:06:40,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 187. [2018-01-21 06:06:40,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-01-21 06:06:40,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2018-01-21 06:06:40,583 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 164 [2018-01-21 06:06:40,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:40,583 INFO L432 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2018-01-21 06:06:40,584 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:06:40,584 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2018-01-21 06:06:40,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-01-21 06:06:40,587 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:40,587 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:40,587 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:40,587 INFO L82 PathProgramCache]: Analyzing trace with hash -1562233122, now seen corresponding path program 6 times [2018-01-21 06:06:40,587 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:40,588 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:40,588 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:40,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:40,589 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:40,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:40,621 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:40,789 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:06:40,789 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:40,789 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:40,789 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:40,789 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:40,789 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:40,790 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:40,795 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:40,795 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:40,810 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,812 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,815 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,819 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,834 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,841 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,851 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:40,853 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:40,864 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:40,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:06:40,890 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:40,998 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:06:41,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:41,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:41,022 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:41,023 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:41,041 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:41,048 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:41,063 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:41,083 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:41,138 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:41,299 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:42,714 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:43,126 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:55,162 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:55,228 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:55,251 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:55,273 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:06:55,273 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:55,365 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:06:55,368 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:55,369 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 06:06:55,369 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:55,369 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 06:06:55,370 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 06:06:55,370 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:06:55,370 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand 11 states. [2018-01-21 06:06:55,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:55,494 INFO L93 Difference]: Finished difference Result 295 states and 329 transitions. [2018-01-21 06:06:55,494 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 06:06:55,494 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 202 [2018-01-21 06:06:55,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:55,497 INFO L225 Difference]: With dead ends: 295 [2018-01-21 06:06:55,497 INFO L226 Difference]: Without dead ends: 247 [2018-01-21 06:06:55,498 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:06:55,498 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-01-21 06:06:55,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 199. [2018-01-21 06:06:55,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-01-21 06:06:55,509 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 222 transitions. [2018-01-21 06:06:55,509 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 222 transitions. Word has length 202 [2018-01-21 06:06:55,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:55,510 INFO L432 AbstractCegarLoop]: Abstraction has 199 states and 222 transitions. [2018-01-21 06:06:55,510 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 06:06:55,510 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 222 transitions. [2018-01-21 06:06:55,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-01-21 06:06:55,513 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:55,513 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:55,513 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:55,514 INFO L82 PathProgramCache]: Analyzing trace with hash 1505706396, now seen corresponding path program 7 times [2018-01-21 06:06:55,514 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:55,515 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:55,515 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:55,515 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:55,515 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:55,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:55,548 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:55,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 06:06:55,768 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:55,768 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:55,768 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:55,768 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:55,768 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:55,768 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:55,773 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:55,774 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:55,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:55,834 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:56,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 06:06:56,008 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:56,246 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 06:06:56,267 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:56,267 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:56,270 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:56,270 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:06:56,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:56,371 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:56,407 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-21 06:06:56,407 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:56,631 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-21 06:06:56,633 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:56,633 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 06:06:56,633 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:56,633 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 06:06:56,634 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 06:06:56,634 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:06:56,634 INFO L87 Difference]: Start difference. First operand 199 states and 222 transitions. Second operand 23 states. [2018-01-21 06:06:57,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:57,058 INFO L93 Difference]: Finished difference Result 498 states and 557 transitions. [2018-01-21 06:06:57,058 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 06:06:57,059 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 235 [2018-01-21 06:06:57,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:57,061 INFO L225 Difference]: With dead ends: 498 [2018-01-21 06:06:57,061 INFO L226 Difference]: Without dead ends: 390 [2018-01-21 06:06:57,062 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 907 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:06:57,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-21 06:06:57,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 242. [2018-01-21 06:06:57,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-01-21 06:06:57,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 271 transitions. [2018-01-21 06:06:57,075 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 271 transitions. Word has length 235 [2018-01-21 06:06:57,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:57,075 INFO L432 AbstractCegarLoop]: Abstraction has 242 states and 271 transitions. [2018-01-21 06:06:57,075 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 06:06:57,076 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 271 transitions. [2018-01-21 06:06:57,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-01-21 06:06:57,077 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:57,077 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:57,077 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:57,077 INFO L82 PathProgramCache]: Analyzing trace with hash 369611686, now seen corresponding path program 8 times [2018-01-21 06:06:57,077 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:57,078 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:57,078 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:06:57,078 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:57,078 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:57,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:57,105 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:57,419 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 06:06:57,419 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:57,419 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:57,419 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:57,419 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:57,419 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:57,419 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:57,425 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:57,425 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:57,447 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,491 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:57,504 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:57,509 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:57,705 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 06:06:57,705 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:58,008 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 06:06:58,030 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:58,030 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:58,033 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:06:58,033 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:58,058 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:58,114 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:58,159 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:58,171 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:58,245 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-21 06:06:58,245 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-21 06:06:58,580 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:58,610 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 06:06:58,610 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:58,611 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 06:06:58,611 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 06:06:58,611 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:06:58,612 INFO L87 Difference]: Start difference. First operand 242 states and 271 transitions. Second operand 26 states. [2018-01-21 06:06:59,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:59,224 INFO L93 Difference]: Finished difference Result 607 states and 679 transitions. [2018-01-21 06:06:59,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 06:06:59,225 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 288 [2018-01-21 06:06:59,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:59,228 INFO L225 Difference]: With dead ends: 607 [2018-01-21 06:06:59,228 INFO L226 Difference]: Without dead ends: 486 [2018-01-21 06:06:59,230 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1177 GetRequests, 1114 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:06:59,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-01-21 06:06:59,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 290. [2018-01-21 06:06:59,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-01-21 06:06:59,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 326 transitions. [2018-01-21 06:06:59,251 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 326 transitions. Word has length 288 [2018-01-21 06:06:59,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:59,251 INFO L432 AbstractCegarLoop]: Abstraction has 290 states and 326 transitions. [2018-01-21 06:06:59,251 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 06:06:59,252 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 326 transitions. [2018-01-21 06:06:59,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-01-21 06:06:59,254 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:59,254 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:59,254 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:59,255 INFO L82 PathProgramCache]: Analyzing trace with hash -292281344, now seen corresponding path program 9 times [2018-01-21 06:06:59,255 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:59,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:59,256 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:59,256 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:59,256 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:59,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:59,298 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:59,675 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 06:06:59,675 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:59,675 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:59,675 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:59,675 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:59,676 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:59,676 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:59,682 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:06:59,682 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:06:59,717 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,722 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,728 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,735 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,745 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,755 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,781 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:06:59,783 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:59,791 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:59,961 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 06:06:59,961 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:00,472 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 06:07:00,493 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:00,493 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:07:00,496 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:07:00,497 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:07:00,529 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:00,542 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:00,563 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:00,586 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:00,625 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:00,700 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:01,057 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:01,946 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:07:01,988 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:01,996 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:02,047 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 06:07:02,047 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:02,233 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-21 06:07:02,235 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:02,235 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 06:07:02,235 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:02,236 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:07:02,236 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:07:02,236 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 06:07:02,237 INFO L87 Difference]: Start difference. First operand 290 states and 326 transitions. Second operand 21 states. [2018-01-21 06:07:02,691 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:02,692 INFO L93 Difference]: Finished difference Result 697 states and 790 transitions. [2018-01-21 06:07:02,692 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 06:07:02,692 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 346 [2018-01-21 06:07:02,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:02,697 INFO L225 Difference]: With dead ends: 697 [2018-01-21 06:07:02,697 INFO L226 Difference]: Without dead ends: 634 [2018-01-21 06:07:02,698 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1402 GetRequests, 1364 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:07:02,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-01-21 06:07:02,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 351. [2018-01-21 06:07:02,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-01-21 06:07:02,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 400 transitions. [2018-01-21 06:07:02,719 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 400 transitions. Word has length 346 [2018-01-21 06:07:02,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:02,719 INFO L432 AbstractCegarLoop]: Abstraction has 351 states and 400 transitions. [2018-01-21 06:07:02,719 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:07:02,719 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 400 transitions. [2018-01-21 06:07:02,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2018-01-21 06:07:02,721 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:02,721 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:07:02,722 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:02,722 INFO L82 PathProgramCache]: Analyzing trace with hash 1529949378, now seen corresponding path program 10 times [2018-01-21 06:07:02,722 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:02,722 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:02,723 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:02,723 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:02,723 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:02,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:02,755 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:03,348 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 06:07:03,349 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:03,349 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:03,349 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:03,349 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:03,349 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:03,349 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:07:03,357 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:03,357 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:03,461 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:03,469 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:03,794 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 06:07:03,810 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:04,207 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 06:07:04,226 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:04,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:07:04,229 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:07:04,229 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:07:04,420 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:04,432 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:04,532 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-21 06:07:04,532 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:04,823 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-21 06:07:04,825 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:07:04,825 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 06:07:04,825 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:07:04,826 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:07:04,826 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:07:04,827 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:07:04,827 INFO L87 Difference]: Start difference. First operand 351 states and 400 transitions. Second operand 32 states. [2018-01-21 06:07:05,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:07:05,543 INFO L93 Difference]: Finished difference Result 905 states and 1030 transitions. [2018-01-21 06:07:05,544 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 06:07:05,544 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 409 [2018-01-21 06:07:05,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:07:05,547 INFO L225 Difference]: With dead ends: 905 [2018-01-21 06:07:05,547 INFO L226 Difference]: Without dead ends: 744 [2018-01-21 06:07:05,549 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1667 GetRequests, 1588 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 06:07:05,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2018-01-21 06:07:05,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 409. [2018-01-21 06:07:05,568 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-01-21 06:07:05,570 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 464 transitions. [2018-01-21 06:07:05,570 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 464 transitions. Word has length 409 [2018-01-21 06:07:05,571 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:07:05,571 INFO L432 AbstractCegarLoop]: Abstraction has 409 states and 464 transitions. [2018-01-21 06:07:05,571 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:07:05,571 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 464 transitions. [2018-01-21 06:07:05,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2018-01-21 06:07:05,573 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:07:05,574 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 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] [2018-01-21 06:07:05,574 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:07:05,574 INFO L82 PathProgramCache]: Analyzing trace with hash 1199895744, now seen corresponding path program 11 times [2018-01-21 06:07:05,574 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:07:05,574 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:05,574 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:07:05,575 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:07:05,575 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:07:05,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:07:05,610 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:07:06,061 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 06:07:06,062 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:06,062 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:07:06,062 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:07:06,062 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:07:06,062 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:06,062 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 [2018-01-21 06:07:06,068 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:06,069 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:06,095 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,109 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,116 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,125 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,134 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,145 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,159 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,172 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:06,175 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:07:06,185 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:07:06,500 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 6406 proven. 313 refuted. 0 times theorem prover too weak. 4134 trivial. 0 not checked. [2018-01-21 06:07:06,500 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:07:07,025 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 1168 proven. 1655 refuted. 0 times theorem prover too weak. 8030 trivial. 0 not checked. [2018-01-21 06:07:07,045 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:07:07,045 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 [2018-01-21 06:07:07,049 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:07:07,049 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:07:07,089 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:07,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:07,163 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:07,290 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:07:19,326 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-21 06:07:31,378 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown