java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-20 23:52:55,135 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-20 23:52:55,137 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-20 23:52:55,152 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-20 23:52:55,152 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-20 23:52:55,153 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-20 23:52:55,154 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-20 23:52:55,156 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-20 23:52:55,158 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-20 23:52:55,158 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-20 23:52:55,159 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-20 23:52:55,160 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-20 23:52:55,160 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-20 23:52:55,162 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-20 23:52:55,162 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-20 23:52:55,165 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-20 23:52:55,167 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-20 23:52:55,169 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-20 23:52:55,170 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-20 23:52:55,171 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-20 23:52:55,174 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-20 23:52:55,174 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-20 23:52:55,174 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-20 23:52:55,175 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-20 23:52:55,176 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-20 23:52:55,177 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-20 23:52:55,178 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-20 23:52:55,178 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-20 23:52:55,178 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-20 23:52:55,179 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-20 23:52:55,179 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-20 23:52:55,180 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ.epf [2018-01-20 23:52:55,188 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-20 23:52:55,188 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-20 23:52:55,189 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-20 23:52:55,189 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-20 23:52:55,189 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-20 23:52:55,189 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-20 23:52:55,189 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-20 23:52:55,190 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-20 23:52:55,190 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-20 23:52:55,190 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-20 23:52:55,190 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-20 23:52:55,190 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-20 23:52:55,190 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-20 23:52:55,191 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-20 23:52:55,191 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-20 23:52:55,192 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-20 23:52:55,192 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-20 23:52:55,192 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-20 23:52:55,192 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-20 23:52:55,192 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:52:55,193 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-20 23:52:55,193 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-20 23:52:55,194 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-20 23:52:55,194 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-20 23:52:55,195 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-20 23:52:55,236 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-20 23:52:55,246 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-20 23:52:55,249 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-20 23:52:55,250 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-20 23:52:55,251 INFO L276 PluginConnector]: CDTParser initialized [2018-01-20 23:52:55,251 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_true-valid-memsafety.c [2018-01-20 23:52:55,378 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-20 23:52:55,383 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-20 23:52:55,384 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:55,384 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-20 23:52:55,391 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-20 23:52:55,392 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,394 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 20.01 11:52:55, skipping insertion in model container [2018-01-20 23:52:55,395 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,407 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:55,423 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-20 23:52:55,528 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:55,550 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-20 23:52:55,558 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55 WrapperNode [2018-01-20 23:52:55,558 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-20 23:52:55,558 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-20 23:52:55,559 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-20 23:52:55,559 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-20 23:52:55,569 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,576 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,576 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,579 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,584 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... [2018-01-20 23:52:55,585 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-20 23:52:55,585 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-20 23:52:55,586 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-20 23:52:55,586 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-20 23:52:55,586 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-20 23:52:55,627 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-20 23:52:55,627 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-20 23:52:55,627 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-20 23:52:55,628 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-20 23:52:55,628 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-20 23:52:55,628 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-20 23:52:55,628 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-20 23:52:55,628 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-20 23:52:55,628 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-20 23:52:55,629 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-20 23:52:55,629 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-20 23:52:55,629 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-20 23:52:55,629 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-20 23:52:55,783 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-20 23:52:55,783 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:55 BoogieIcfgContainer [2018-01-20 23:52:55,784 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-20 23:52:55,784 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-20 23:52:55,785 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-20 23:52:55,787 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-20 23:52:55,787 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.01 11:52:55" (1/3) ... [2018-01-20 23:52:55,788 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 20.01 11:52:55, skipping insertion in model container [2018-01-20 23:52:55,788 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.01 11:52:55" (2/3) ... [2018-01-20 23:52:55,788 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 20.01 11:52:55, skipping insertion in model container [2018-01-20 23:52:55,789 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.01 11:52:55" (3/3) ... [2018-01-20 23:52:55,790 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_true-valid-memsafety.c [2018-01-20 23:52:55,797 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-20 23:52:55,802 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-20 23:52:55,840 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:55,840 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:55,840 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:55,840 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:55,840 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:55,841 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:55,841 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:55,841 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-20 23:52:55,842 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:55,862 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:52:55,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-20 23:52:55,868 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:55,869 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-20 23:52:55,869 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-20 23:52:55,875 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-20 23:52:55,877 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:55,934 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:55,934 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:55,935 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:55,935 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:55,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:55,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-20 23:52:55,987 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-20 23:52:55,993 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-20 23:52:55,997 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:55,998 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:55,998 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:55,998 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:55,998 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:55,998 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:55,998 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:55,998 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-20 23:52:55,998 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:56,000 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:52:56,000 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-20 23:52:56,001 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:56,001 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:56,001 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-20 23:52:56,001 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-20 23:52:56,001 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:56,002 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,002 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:56,002 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,002 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:56,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:56,027 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:56,059 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:56,061 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:56,061 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:56,061 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:56,064 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:56,074 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:56,075 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:56,077 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-20 23:52:56,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:56,096 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-20 23:52:56,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:56,098 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-20 23:52:56,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:56,106 INFO L225 Difference]: With dead ends: 78 [2018-01-20 23:52:56,106 INFO L226 Difference]: Without dead ends: 0 [2018-01-20 23:52:56,110 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:56,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-20 23:52:56,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-20 23:52:56,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-20 23:52:56,212 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-20 23:52:56,213 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-20 23:52:56,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:56,214 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-20 23:52:56,214 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:56,214 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-20 23:52:56,214 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-20 23:52:56,217 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-20 23:52:56,217 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-20 23:52:56,217 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-20 23:52:56,218 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-20 23:52:56,218 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-20 23:52:56,218 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-20 23:52:56,218 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-20 23:52:56,218 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-20 23:52:56,218 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-20 23:52:56,219 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-20 23:52:56,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-20 23:52:56,220 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:56,220 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:56,221 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:56,221 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-20 23:52:56,221 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:56,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,222 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:56,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,222 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:56,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:56,229 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:56,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:56,243 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:56,244 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-20 23:52:56,244 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:56,244 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-20 23:52:56,244 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-20 23:52:56,245 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:56,245 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-20 23:52:56,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:56,251 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-20 23:52:56,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-20 23:52:56,251 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-20 23:52:56,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:56,254 INFO L225 Difference]: With dead ends: 78 [2018-01-20 23:52:56,254 INFO L226 Difference]: Without dead ends: 40 [2018-01-20 23:52:56,255 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-20 23:52:56,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-20 23:52:56,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-20 23:52:56,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-20 23:52:56,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-20 23:52:56,267 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-20 23:52:56,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:56,267 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-20 23:52:56,267 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-20 23:52:56,267 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-20 23:52:56,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-20 23:52:56,268 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:56,268 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:56,268 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:56,269 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-20 23:52:56,269 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:56,269 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,270 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:56,270 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,270 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:56,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:56,281 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:56,313 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:56,314 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-20 23:52:56,314 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-20 23:52:56,314 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:56,315 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-20 23:52:56,315 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-20 23:52:56,315 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:52:56,316 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-20 23:52:56,372 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:56,372 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-20 23:52:56,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-20 23:52:56,373 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-20 23:52:56,373 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:56,376 INFO L225 Difference]: With dead ends: 73 [2018-01-20 23:52:56,376 INFO L226 Difference]: Without dead ends: 57 [2018-01-20 23:52:56,377 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-20 23:52:56,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-20 23:52:56,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-20 23:52:56,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-20 23:52:56,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-20 23:52:56,389 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-20 23:52:56,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:56,389 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-20 23:52:56,389 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-20 23:52:56,389 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-20 23:52:56,390 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-20 23:52:56,391 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:56,391 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-20 23:52:56,391 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:56,391 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-20 23:52:56,391 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:56,392 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,393 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:56,393 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:56,393 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:56,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:56,410 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:56,470 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:56,471 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:56,471 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:56,472 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-20 23:52:56,474 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-20 23:52:56,519 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:52:56,519 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:52:57,110 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:52:57,111 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-20 23:52:57,124 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:52:57,124 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:57,124 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:57,139 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:57,139 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:57,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:57,178 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:57,254 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:57,254 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:57,378 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:57,402 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:57,402 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 [2018-01-20 23:52:57,406 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:57,406 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:57,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:57,445 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:57,451 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:57,451 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:57,484 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-20 23:52:57,485 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:57,485 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-20 23:52:57,485 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:57,486 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-20 23:52:57,486 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-20 23:52:57,486 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-20 23:52:57,487 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-20 23:52:57,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:57,552 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2018-01-20 23:52:57,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-20 23:52:57,553 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-20 23:52:57,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:57,555 INFO L225 Difference]: With dead ends: 92 [2018-01-20 23:52:57,556 INFO L226 Difference]: Without dead ends: 74 [2018-01-20 23:52:57,556 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 [2018-01-20 23:52:57,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2018-01-20 23:52:57,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 56. [2018-01-20 23:52:57,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-01-20 23:52:57,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 61 transitions. [2018-01-20 23:52:57,564 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 61 transitions. Word has length 34 [2018-01-20 23:52:57,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:57,565 INFO L432 AbstractCegarLoop]: Abstraction has 56 states and 61 transitions. [2018-01-20 23:52:57,565 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-20 23:52:57,565 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 61 transitions. [2018-01-20 23:52:57,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-20 23:52:57,567 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:57,567 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] [2018-01-20 23:52:57,568 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:57,568 INFO L82 PathProgramCache]: Analyzing trace with hash 284082524, now seen corresponding path program 2 times [2018-01-20 23:52:57,568 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:57,569 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:57,569 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:57,569 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:57,569 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:57,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:57,588 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:57,661 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-20 23:52:57,661 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:57,661 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:57,661 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:57,662 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:57,662 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:57,662 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 [2018-01-20 23:52:57,670 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:57,670 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:57,686 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:57,696 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:57,698 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:57,701 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:57,751 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-20 23:52:57,751 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:57,965 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-20 23:52:57,985 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-20 23:52:57,985 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-20 23:52:57,985 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-20 23:52:57,985 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:52:57,986 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:52:57,986 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-20 23:52:57,986 INFO L87 Difference]: Start difference. First operand 56 states and 61 transitions. Second operand 6 states. [2018-01-20 23:52:58,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:58,114 INFO L93 Difference]: Finished difference Result 108 states and 119 transitions. [2018-01-20 23:52:58,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-20 23:52:58,115 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-20 23:52:58,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:58,116 INFO L225 Difference]: With dead ends: 108 [2018-01-20 23:52:58,116 INFO L226 Difference]: Without dead ends: 69 [2018-01-20 23:52:58,117 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 [2018-01-20 23:52:58,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-01-20 23:52:58,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 61. [2018-01-20 23:52:58,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2018-01-20 23:52:58,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2018-01-20 23:52:58,127 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 47 [2018-01-20 23:52:58,127 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:58,127 INFO L432 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2018-01-20 23:52:58,127 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:52:58,127 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2018-01-20 23:52:58,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-20 23:52:58,129 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:58,129 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] [2018-01-20 23:52:58,130 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:58,130 INFO L82 PathProgramCache]: Analyzing trace with hash -1139762048, now seen corresponding path program 1 times [2018-01-20 23:52:58,130 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:58,131 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:58,131 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:58,131 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:58,132 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:58,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:58,156 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:58,233 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:58,234 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:58,234 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:58,234 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 53 with the following transitions: [2018-01-20 23:52:58,234 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-20 23:52:58,236 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-20 23:52:58,236 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-20 23:52:58,612 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-20 23:52:58,612 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-20 23:52:58,615 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-20 23:52:58,615 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:58,615 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:58,623 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:58,623 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:58,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:58,648 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:58,667 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:58,667 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:58,741 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:58,773 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:58,773 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:58,776 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:58,777 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:52:58,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:58,820 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:58,828 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:58,828 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:58,864 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-20 23:52:58,866 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:58,866 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-20 23:52:58,866 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:58,867 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-20 23:52:58,867 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-20 23:52:58,867 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-20 23:52:58,867 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand 6 states. [2018-01-20 23:52:58,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:58,935 INFO L93 Difference]: Finished difference Result 119 states and 133 transitions. [2018-01-20 23:52:58,935 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-20 23:52:58,936 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2018-01-20 23:52:58,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:58,937 INFO L225 Difference]: With dead ends: 119 [2018-01-20 23:52:58,937 INFO L226 Difference]: Without dead ends: 96 [2018-01-20 23:52:58,937 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 [2018-01-20 23:52:58,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2018-01-20 23:52:58,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 73. [2018-01-20 23:52:58,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2018-01-20 23:52:58,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 81 transitions. [2018-01-20 23:52:58,944 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 81 transitions. Word has length 52 [2018-01-20 23:52:58,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:58,945 INFO L432 AbstractCegarLoop]: Abstraction has 73 states and 81 transitions. [2018-01-20 23:52:58,945 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-20 23:52:58,945 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 81 transitions. [2018-01-20 23:52:58,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2018-01-20 23:52:58,946 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:58,946 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] [2018-01-20 23:52:58,947 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:58,947 INFO L82 PathProgramCache]: Analyzing trace with hash -2110418334, now seen corresponding path program 2 times [2018-01-20 23:52:58,947 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:58,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:58,947 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:52:58,948 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:58,948 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:58,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:58,971 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:59,039 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:59,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:59,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:59,040 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:59,040 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:59,040 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:59,040 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:59,049 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:59,049 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:59,063 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:59,077 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:59,079 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:59,083 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:59,173 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-20 23:52:59,173 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:59,359 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 48 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-20 23:52:59,391 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:59,391 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:52:59,394 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:52:59,395 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:52:59,408 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:59,428 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:52:59,441 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:59,445 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:59,460 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:59,461 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:52:59,513 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-20 23:52:59,514 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:52:59,515 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-20 23:52:59,515 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:52:59,515 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-20 23:52:59,515 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-20 23:52:59,515 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:52:59,516 INFO L87 Difference]: Start difference. First operand 73 states and 81 transitions. Second operand 12 states. [2018-01-20 23:52:59,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:52:59,716 INFO L93 Difference]: Finished difference Result 192 states and 218 transitions. [2018-01-20 23:52:59,717 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-20 23:52:59,717 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 70 [2018-01-20 23:52:59,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:52:59,718 INFO L225 Difference]: With dead ends: 192 [2018-01-20 23:52:59,718 INFO L226 Difference]: Without dead ends: 143 [2018-01-20 23:52:59,719 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 289 GetRequests, 262 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-20 23:52:59,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2018-01-20 23:52:59,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 101. [2018-01-20 23:52:59,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2018-01-20 23:52:59,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 113 transitions. [2018-01-20 23:52:59,730 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 113 transitions. Word has length 70 [2018-01-20 23:52:59,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:52:59,730 INFO L432 AbstractCegarLoop]: Abstraction has 101 states and 113 transitions. [2018-01-20 23:52:59,730 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-20 23:52:59,730 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 113 transitions. [2018-01-20 23:52:59,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-01-20 23:52:59,732 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:52:59,733 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] [2018-01-20 23:52:59,733 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:52:59,733 INFO L82 PathProgramCache]: Analyzing trace with hash 1934895936, now seen corresponding path program 3 times [2018-01-20 23:52:59,733 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:52:59,734 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:59,734 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:52:59,734 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:52:59,734 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:52:59,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:52:59,760 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:52:59,869 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-20 23:52:59,869 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:59,870 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:52:59,870 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:52:59,870 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:52:59,870 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:52:59,870 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:52:59,878 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:52:59,879 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:52:59,895 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:59,900 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:59,905 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:59,911 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:52:59,913 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:52:59,915 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:52:59,958 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-20 23:52:59,959 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:00,102 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-20 23:53:00,122 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:00,122 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:00,127 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:00,127 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:00,140 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:00,149 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:00,162 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:00,187 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:00,199 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:00,204 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:00,214 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-20 23:53:00,214 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:00,300 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 83 proven. 9 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2018-01-20 23:53:00,302 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:00,302 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-20 23:53:00,302 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:00,303 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-20 23:53:00,303 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-20 23:53:00,303 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-20 23:53:00,303 INFO L87 Difference]: Start difference. First operand 101 states and 113 transitions. Second operand 11 states. [2018-01-20 23:53:00,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:00,483 INFO L93 Difference]: Finished difference Result 239 states and 273 transitions. [2018-01-20 23:53:00,483 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-20 23:53:00,483 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 98 [2018-01-20 23:53:00,484 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:00,486 INFO L225 Difference]: With dead ends: 239 [2018-01-20 23:53:00,486 INFO L226 Difference]: Without dead ends: 206 [2018-01-20 23:53:00,487 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 [2018-01-20 23:53:00,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2018-01-20 23:53:00,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 142. [2018-01-20 23:53:00,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2018-01-20 23:53:00,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 162 transitions. [2018-01-20 23:53:00,502 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 162 transitions. Word has length 98 [2018-01-20 23:53:00,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:00,503 INFO L432 AbstractCegarLoop]: Abstraction has 142 states and 162 transitions. [2018-01-20 23:53:00,503 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-20 23:53:00,503 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 162 transitions. [2018-01-20 23:53:00,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2018-01-20 23:53:00,505 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:00,505 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] [2018-01-20 23:53:00,505 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:00,506 INFO L82 PathProgramCache]: Analyzing trace with hash -883540994, now seen corresponding path program 4 times [2018-01-20 23:53:00,506 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:00,507 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:00,507 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:00,507 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:00,507 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:00,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:00,536 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:00,690 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-20 23:53:00,690 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:00,691 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:00,691 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:00,691 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:00,691 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:00,691 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:00,697 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:00,697 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:00,729 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:00,732 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:00,840 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:53:00,840 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:01,005 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:53:01,025 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:01,025 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:01,028 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:01,028 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:01,078 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:01,083 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:01,101 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:53:01,102 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:01,247 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 226 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-20 23:53:01,249 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:01,249 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-20 23:53:01,249 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:01,250 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:53:01,250 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:53:01,250 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:53:01,250 INFO L87 Difference]: Start difference. First operand 142 states and 162 transitions. Second operand 18 states. [2018-01-20 23:53:01,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:01,663 INFO L93 Difference]: Finished difference Result 371 states and 427 transitions. [2018-01-20 23:53:01,663 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-20 23:53:01,663 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 131 [2018-01-20 23:53:01,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:01,666 INFO L225 Difference]: With dead ends: 371 [2018-01-20 23:53:01,666 INFO L226 Difference]: Without dead ends: 283 [2018-01-20 23:53:01,668 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 539 GetRequests, 496 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-20 23:53:01,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2018-01-20 23:53:01,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 180. [2018-01-20 23:53:01,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-20 23:53:01,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 205 transitions. [2018-01-20 23:53:01,685 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 205 transitions. Word has length 131 [2018-01-20 23:53:01,685 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:01,685 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 205 transitions. [2018-01-20 23:53:01,685 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:53:01,686 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 205 transitions. [2018-01-20 23:53:01,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2018-01-20 23:53:01,688 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:01,688 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] [2018-01-20 23:53:01,688 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:01,688 INFO L82 PathProgramCache]: Analyzing trace with hash 1207261824, now seen corresponding path program 5 times [2018-01-20 23:53:01,688 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:01,689 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:01,689 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:01,689 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:01,689 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:01,715 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:01,717 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:01,941 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-20 23:53:01,941 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:01,941 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:01,941 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:01,942 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:01,942 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:01,942 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:01,947 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:01,947 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:01,959 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,963 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,967 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,972 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,978 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,984 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:01,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:01,990 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:02,087 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-20 23:53:02,088 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:02,404 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-20 23:53:02,424 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:02,424 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:02,428 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:02,428 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:02,441 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,446 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,458 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,473 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,495 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,833 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:02,859 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:02,865 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:02,882 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 476 proven. 53 refuted. 0 times theorem prover too weak. 224 trivial. 0 not checked. [2018-01-20 23:53:02,882 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:03,064 INFO L134 CoverageAnalysis]: Checked inductivity of 753 backedges. 146 proven. 235 refuted. 0 times theorem prover too weak. 372 trivial. 0 not checked. [2018-01-20 23:53:03,066 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:03,066 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-20 23:53:03,066 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:03,067 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-20 23:53:03,067 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-20 23:53:03,067 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-20 23:53:03,067 INFO L87 Difference]: Start difference. First operand 180 states and 205 transitions. Second operand 18 states. [2018-01-20 23:53:03,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:03,500 INFO L93 Difference]: Finished difference Result 418 states and 475 transitions. [2018-01-20 23:53:03,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-20 23:53:03,501 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 164 [2018-01-20 23:53:03,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:03,502 INFO L225 Difference]: With dead ends: 418 [2018-01-20 23:53:03,502 INFO L226 Difference]: Without dead ends: 249 [2018-01-20 23:53:03,504 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 684 GetRequests, 635 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 331 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-20 23:53:03,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-01-20 23:53:03,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 187. [2018-01-20 23:53:03,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 187 states. [2018-01-20 23:53:03,518 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 208 transitions. [2018-01-20 23:53:03,518 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 208 transitions. Word has length 164 [2018-01-20 23:53:03,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:03,518 INFO L432 AbstractCegarLoop]: Abstraction has 187 states and 208 transitions. [2018-01-20 23:53:03,518 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-20 23:53:03,519 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 208 transitions. [2018-01-20 23:53:03,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 203 [2018-01-20 23:53:03,521 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:03,521 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] [2018-01-20 23:53:03,521 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:03,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1562233122, now seen corresponding path program 6 times [2018-01-20 23:53:03,522 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:03,522 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:03,522 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:03,529 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:03,529 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:03,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:03,558 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:03,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:53:03,765 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:03,765 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:03,765 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:03,765 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:03,765 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:03,765 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:03,771 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:03,771 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:03,789 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,791 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,794 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,799 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,804 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,810 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,816 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,834 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:03,835 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:03,840 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:03,864 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:53:03,865 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:04,064 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:53:04,084 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:04,084 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:04,088 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-20 23:53:04,088 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-20 23:53:04,113 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:04,120 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:04,135 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:04,155 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:04,205 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:04,351 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:05,564 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:05,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:17,983 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-20 23:53:18,061 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:18,083 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:18,104 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:53:18,120 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:18,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1304 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-20 23:53:18,185 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:18,186 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-20 23:53:18,186 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:18,186 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-20 23:53:18,187 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-20 23:53:18,187 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:53:18,187 INFO L87 Difference]: Start difference. First operand 187 states and 208 transitions. Second operand 11 states. [2018-01-20 23:53:18,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:18,317 INFO L93 Difference]: Finished difference Result 295 states and 329 transitions. [2018-01-20 23:53:18,317 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-20 23:53:18,317 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 202 [2018-01-20 23:53:18,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:18,319 INFO L225 Difference]: With dead ends: 295 [2018-01-20 23:53:18,319 INFO L226 Difference]: Without dead ends: 247 [2018-01-20 23:53:18,320 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 816 GetRequests, 799 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-20 23:53:18,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 247 states. [2018-01-20 23:53:18,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 247 to 199. [2018-01-20 23:53:18,331 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 199 states. [2018-01-20 23:53:18,332 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 222 transitions. [2018-01-20 23:53:18,332 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 222 transitions. Word has length 202 [2018-01-20 23:53:18,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:18,333 INFO L432 AbstractCegarLoop]: Abstraction has 199 states and 222 transitions. [2018-01-20 23:53:18,333 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-20 23:53:18,333 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 222 transitions. [2018-01-20 23:53:18,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 236 [2018-01-20 23:53:18,335 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:18,335 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] [2018-01-20 23:53:18,335 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:18,335 INFO L82 PathProgramCache]: Analyzing trace with hash 1505706396, now seen corresponding path program 7 times [2018-01-20 23:53:18,335 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:18,336 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:18,336 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:18,336 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:18,336 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:18,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:18,365 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:18,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-20 23:53:18,656 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:18,656 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:18,657 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:18,657 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:18,657 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:18,657 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:18,662 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:18,662 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:18,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:18,716 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:18,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-20 23:53:18,884 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:19,171 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-20 23:53:19,192 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:19,192 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:19,195 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:19,195 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-20 23:53:19,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:19,302 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:19,349 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 1262 proven. 38 refuted. 0 times theorem prover too weak. 587 trivial. 0 not checked. [2018-01-20 23:53:19,349 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:19,538 INFO L134 CoverageAnalysis]: Checked inductivity of 1887 backedges. 478 proven. 240 refuted. 0 times theorem prover too weak. 1169 trivial. 0 not checked. [2018-01-20 23:53:19,539 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:19,539 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-20 23:53:19,539 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:19,540 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-20 23:53:19,540 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-20 23:53:19,540 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-20 23:53:19,540 INFO L87 Difference]: Start difference. First operand 199 states and 222 transitions. Second operand 23 states. [2018-01-20 23:53:19,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:19,982 INFO L93 Difference]: Finished difference Result 498 states and 557 transitions. [2018-01-20 23:53:19,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-20 23:53:19,983 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 235 [2018-01-20 23:53:19,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:19,986 INFO L225 Difference]: With dead ends: 498 [2018-01-20 23:53:19,987 INFO L226 Difference]: Without dead ends: 390 [2018-01-20 23:53:19,988 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 907 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-20 23:53:19,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 390 states. [2018-01-20 23:53:20,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 390 to 242. [2018-01-20 23:53:20,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 242 states. [2018-01-20 23:53:20,007 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 242 states to 242 states and 271 transitions. [2018-01-20 23:53:20,007 INFO L78 Accepts]: Start accepts. Automaton has 242 states and 271 transitions. Word has length 235 [2018-01-20 23:53:20,008 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:20,008 INFO L432 AbstractCegarLoop]: Abstraction has 242 states and 271 transitions. [2018-01-20 23:53:20,008 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-20 23:53:20,008 INFO L276 IsEmpty]: Start isEmpty. Operand 242 states and 271 transitions. [2018-01-20 23:53:20,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 289 [2018-01-20 23:53:20,010 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:20,010 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] [2018-01-20 23:53:20,011 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:20,011 INFO L82 PathProgramCache]: Analyzing trace with hash 369611686, now seen corresponding path program 8 times [2018-01-20 23:53:20,011 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:20,012 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:20,012 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-20 23:53:20,012 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:20,012 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:20,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:20,048 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:20,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-20 23:53:20,353 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:20,353 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:20,354 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:20,354 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:20,354 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:20,354 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:20,359 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:20,360 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:20,383 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:20,421 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:20,427 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:20,435 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:20,674 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-20 23:53:20,675 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:21,114 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-20 23:53:21,145 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:21,145 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:21,148 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-20 23:53:21,148 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:21,172 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:21,229 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:21,273 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:21,283 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:21,371 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 2050 proven. 60 refuted. 0 times theorem prover too weak. 1091 trivial. 0 not checked. [2018-01-20 23:53:21,371 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:21,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3201 backedges. 746 proven. 360 refuted. 0 times theorem prover too weak. 2095 trivial. 0 not checked. [2018-01-20 23:53:21,601 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:21,602 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-20 23:53:21,602 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:21,602 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-20 23:53:21,603 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-20 23:53:21,603 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-20 23:53:21,603 INFO L87 Difference]: Start difference. First operand 242 states and 271 transitions. Second operand 26 states. [2018-01-20 23:53:22,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:22,224 INFO L93 Difference]: Finished difference Result 607 states and 679 transitions. [2018-01-20 23:53:22,224 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-20 23:53:22,224 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 288 [2018-01-20 23:53:22,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:22,227 INFO L225 Difference]: With dead ends: 607 [2018-01-20 23:53:22,227 INFO L226 Difference]: Without dead ends: 486 [2018-01-20 23:53:22,229 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1177 GetRequests, 1114 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-20 23:53:22,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 486 states. [2018-01-20 23:53:22,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 486 to 290. [2018-01-20 23:53:22,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-01-20 23:53:22,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 326 transitions. [2018-01-20 23:53:22,252 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 326 transitions. Word has length 288 [2018-01-20 23:53:22,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:22,252 INFO L432 AbstractCegarLoop]: Abstraction has 290 states and 326 transitions. [2018-01-20 23:53:22,252 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-20 23:53:22,253 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 326 transitions. [2018-01-20 23:53:22,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 347 [2018-01-20 23:53:22,255 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:22,256 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] [2018-01-20 23:53:22,256 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:22,256 INFO L82 PathProgramCache]: Analyzing trace with hash -292281344, now seen corresponding path program 9 times [2018-01-20 23:53:22,256 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:22,257 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:22,257 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:22,257 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:22,257 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:22,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:22,303 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:22,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-20 23:53:22,665 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:22,665 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:22,665 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:22,665 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:22,666 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:22,666 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:22,671 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:22,671 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:22,699 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,704 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,709 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,714 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,723 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,732 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,749 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,767 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:22,769 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:22,775 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:23,007 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-20 23:53:23,007 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:23,425 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-20 23:53:23,445 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:23,445 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:23,448 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-20 23:53:23,449 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-20 23:53:23,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,495 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,533 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,569 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,639 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:23,952 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:24,899 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-20 23:53:24,944 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:24,953 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:25,017 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-20 23:53:25,018 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:25,201 INFO L134 CoverageAnalysis]: Checked inductivity of 5090 backedges. 1265 proven. 87 refuted. 0 times theorem prover too weak. 3738 trivial. 0 not checked. [2018-01-20 23:53:25,203 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:25,204 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-20 23:53:25,204 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:25,204 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-20 23:53:25,205 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-20 23:53:25,205 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-20 23:53:25,205 INFO L87 Difference]: Start difference. First operand 290 states and 326 transitions. Second operand 21 states. [2018-01-20 23:53:25,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:25,713 INFO L93 Difference]: Finished difference Result 697 states and 790 transitions. [2018-01-20 23:53:25,713 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-20 23:53:25,714 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 346 [2018-01-20 23:53:25,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:25,722 INFO L225 Difference]: With dead ends: 697 [2018-01-20 23:53:25,722 INFO L226 Difference]: Without dead ends: 634 [2018-01-20 23:53:25,723 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 [2018-01-20 23:53:25,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 634 states. [2018-01-20 23:53:25,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 634 to 351. [2018-01-20 23:53:25,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 351 states. [2018-01-20 23:53:25,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 400 transitions. [2018-01-20 23:53:25,750 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 400 transitions. Word has length 346 [2018-01-20 23:53:25,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:25,751 INFO L432 AbstractCegarLoop]: Abstraction has 351 states and 400 transitions. [2018-01-20 23:53:25,751 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-20 23:53:25,751 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 400 transitions. [2018-01-20 23:53:25,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 410 [2018-01-20 23:53:25,754 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:25,754 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] [2018-01-20 23:53:25,754 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:25,755 INFO L82 PathProgramCache]: Analyzing trace with hash 1529949378, now seen corresponding path program 10 times [2018-01-20 23:53:25,755 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:25,755 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:25,756 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:25,756 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:25,756 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:25,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:25,802 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:26,364 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-20 23:53:26,365 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:26,365 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:26,365 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:26,365 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:26,365 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:26,365 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:26,374 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:26,374 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:26,479 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:26,487 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:26,846 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-20 23:53:26,846 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:27,270 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-20 23:53:27,291 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:27,291 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:27,294 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-20 23:53:27,294 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-20 23:53:27,536 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:27,554 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:27,669 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 4526 proven. 119 refuted. 0 times theorem prover too weak. 3050 trivial. 0 not checked. [2018-01-20 23:53:27,670 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:28,092 INFO L134 CoverageAnalysis]: Checked inductivity of 7695 backedges. 1576 proven. 675 refuted. 0 times theorem prover too weak. 5444 trivial. 0 not checked. [2018-01-20 23:53:28,094 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-20 23:53:28,095 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-20 23:53:28,095 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-20 23:53:28,096 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-20 23:53:28,096 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-20 23:53:28,096 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-20 23:53:28,097 INFO L87 Difference]: Start difference. First operand 351 states and 400 transitions. Second operand 32 states. [2018-01-20 23:53:28,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-20 23:53:28,923 INFO L93 Difference]: Finished difference Result 905 states and 1030 transitions. [2018-01-20 23:53:28,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-20 23:53:28,923 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 409 [2018-01-20 23:53:28,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-20 23:53:28,928 INFO L225 Difference]: With dead ends: 905 [2018-01-20 23:53:28,928 INFO L226 Difference]: Without dead ends: 744 [2018-01-20 23:53:28,931 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1667 GetRequests, 1588 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-20 23:53:28,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 744 states. [2018-01-20 23:53:28,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 744 to 409. [2018-01-20 23:53:28,959 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 409 states. [2018-01-20 23:53:28,960 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 409 states to 409 states and 464 transitions. [2018-01-20 23:53:28,961 INFO L78 Accepts]: Start accepts. Automaton has 409 states and 464 transitions. Word has length 409 [2018-01-20 23:53:28,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-20 23:53:28,961 INFO L432 AbstractCegarLoop]: Abstraction has 409 states and 464 transitions. [2018-01-20 23:53:28,961 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-20 23:53:28,961 INFO L276 IsEmpty]: Start isEmpty. Operand 409 states and 464 transitions. [2018-01-20 23:53:28,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 473 [2018-01-20 23:53:28,963 INFO L314 BasicCegarLoop]: Found error trace [2018-01-20 23:53:28,964 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] [2018-01-20 23:53:28,964 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-20 23:53:28,964 INFO L82 PathProgramCache]: Analyzing trace with hash 1199895744, now seen corresponding path program 11 times [2018-01-20 23:53:28,964 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-20 23:53:28,965 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:28,965 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-20 23:53:28,965 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-20 23:53:28,965 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-20 23:53:29,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-20 23:53:29,017 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-20 23:53:29,588 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-20 23:53:29,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:29,589 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-20 23:53:29,589 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-20 23:53:29,589 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-20 23:53:29,589 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:29,589 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-20 23:53:29,595 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:29,596 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:29,620 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,627 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,633 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,641 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,649 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,660 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,673 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,685 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:29,687 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-20 23:53:29,695 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-20 23:53:29,981 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 6406 proven. 313 refuted. 0 times theorem prover too weak. 4134 trivial. 0 not checked. [2018-01-20 23:53:29,982 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-20 23:53:30,717 INFO L134 CoverageAnalysis]: Checked inductivity of 10853 backedges. 1168 proven. 1655 refuted. 0 times theorem prover too weak. 8030 trivial. 0 not checked. [2018-01-20 23:53:30,750 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-20 23:53:30,751 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-20 23:53:30,754 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-20 23:53:30,755 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-20 23:53:30,792 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:30,809 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:30,849 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:30,995 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-20 23:53:43,031 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Received shutdown request... [2018-01-20 23:53:55,081 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command Cannot interrupt operation gracefully because timeout expired. Forcing shutdown