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_smtcomp.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 10:28:25,728 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 10:28:25,730 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 10:28:25,743 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 10:28:25,743 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 10:28:25,744 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 10:28:25,745 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 10:28:25,747 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 10:28:25,749 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 10:28:25,750 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 10:28:25,750 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 10:28:25,751 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 10:28:25,751 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 10:28:25,752 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 10:28:25,753 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 10:28:25,755 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 10:28:25,758 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 10:28:25,760 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 10:28:25,761 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 10:28:25,763 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 10:28:25,765 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 10:28:25,766 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 10:28:25,766 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 10:28:25,767 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 10:28:25,768 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 10:28:25,769 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 10:28:25,769 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 10:28:25,770 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 10:28:25,770 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 10:28:25,770 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 10:28:25,771 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 10:28:25,771 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_smtcomp.epf [2018-01-21 10:28:25,782 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 10:28:25,782 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 10:28:25,783 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 10:28:25,783 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 10:28:25,783 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 10:28:25,784 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 10:28:25,784 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 10:28:25,784 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 10:28:25,785 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 10:28:25,785 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 10:28:25,785 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 10:28:25,785 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 10:28:25,785 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 10:28:25,786 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 10:28:25,787 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 10:28:25,787 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 10:28:25,787 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 10:28:25,787 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 10:28:25,787 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 10:28:25,788 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 10:28:25,788 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 10:28:25,788 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:28:25,788 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 10:28:25,788 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 10:28:25,789 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 10:28:25,790 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 10:28:25,790 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 10:28:25,791 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 10:28:25,791 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 10:28:25,825 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 10:28:25,840 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 10:28:25,845 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 10:28:25,846 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 10:28:25,847 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 10:28:25,848 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 10:28:25,965 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 10:28:25,970 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 10:28:25,971 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 10:28:25,972 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 10:28:25,980 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 10:28:25,981 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:25,983 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@60b199dd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:25, skipping insertion in model container [2018-01-21 10:28:25,984 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 10:28:25" (1/1) ... [2018-01-21 10:28:26,002 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:28:26,022 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 10:28:26,139 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:28:26,155 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 10:28:26,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26 WrapperNode [2018-01-21 10:28:26,162 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 10:28:26,163 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 10:28:26,163 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 10:28:26,163 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 10:28:26,175 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,175 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,183 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,184 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,186 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,189 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,190 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... [2018-01-21 10:28:26,191 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 10:28:26,192 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 10:28:26,192 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 10:28:26,192 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 10:28:26,193 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 10:28:26,243 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 10:28:26,243 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 10:28:26,243 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 10:28:26,243 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 10:28:26,243 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 10:28:26,244 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 10:28:26,432 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 10:28:26,432 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:28:26 BoogieIcfgContainer [2018-01-21 10:28:26,432 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 10:28:26,433 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 10:28:26,434 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 10:28:26,436 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 10:28:26,436 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 10:28:25" (1/3) ... [2018-01-21 10:28:26,437 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66a2c22a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:28:26, skipping insertion in model container [2018-01-21 10:28:26,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 10:28:26" (2/3) ... [2018-01-21 10:28:26,437 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@66a2c22a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 10:28:26, skipping insertion in model container [2018-01-21 10:28:26,437 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 10:28:26" (3/3) ... [2018-01-21 10:28:26,439 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 10:28:26,447 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 10:28:26,453 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 10:28:26,494 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:26,494 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:26,494 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:26,494 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:26,494 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:26,495 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:26,495 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:26,495 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 10:28:26,496 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:26,517 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:28:26,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 10:28:26,523 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,524 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 10:28:26,525 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 10:28:26,530 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 10:28:26,533 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,589 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,589 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,589 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:28:26,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 10:28:26,640 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 10:28:26,647 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 10:28:26,652 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:26,653 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:26,653 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:26,653 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:26,653 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:26,653 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:26,653 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:26,653 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 10:28:26,653 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:26,655 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:28:26,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 10:28:26,656 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,656 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,656 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 10:28:26,656 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 10:28:26,656 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,657 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,657 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,657 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,658 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,686 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,717 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,718 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,719 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:28:26,719 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,720 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:28:26,731 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:28:26,731 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,733 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 10:28:26,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,763 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 10:28:26,764 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:28:26,765 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 10:28:26,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,773 INFO L225 Difference]: With dead ends: 78 [2018-01-21 10:28:26,774 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 10:28:26,778 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 10:28:26,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 10:28:26,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 10:28:26,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 10:28:26,882 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 10:28:26,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,882 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 10:28:26,882 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:28:26,882 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 10:28:26,882 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 10:28:26,885 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 10:28:26,885 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 10:28:26,885 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 10:28:26,885 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 10:28:26,885 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 10:28:26,885 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 10:28:26,885 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 10:28:26,885 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 10:28:26,885 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 10:28:26,887 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 10:28:26,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 10:28:26,888 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,888 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,888 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,888 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 10:28:26,888 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,890 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,890 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,890 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,890 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,899 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,909 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,910 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 10:28:26,910 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,910 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 10:28:26,910 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 10:28:26,910 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,910 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 10:28:26,915 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:26,915 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 10:28:26,915 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 10:28:26,915 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 10:28:26,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:26,917 INFO L225 Difference]: With dead ends: 78 [2018-01-21 10:28:26,917 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 10:28:26,918 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 10:28:26,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 10:28:26,926 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 10:28:26,926 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 10:28:26,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 10:28:26,927 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 10:28:26,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:26,927 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 10:28:26,927 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 10:28:26,928 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 10:28:26,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 10:28:26,928 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:26,928 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:26,928 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:26,929 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 10:28:26,929 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:26,929 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,930 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:26,930 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:26,930 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:26,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:26,942 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:26,973 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:26,974 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 10:28:26,974 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 10:28:26,974 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:26,976 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 10:28:26,976 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 10:28:26,976 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:28:26,977 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 10:28:27,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:27,048 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 10:28:27,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 10:28:27,048 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 10:28:27,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:27,052 INFO L225 Difference]: With dead ends: 73 [2018-01-21 10:28:27,053 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 10:28:27,054 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 10:28:27,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 10:28:27,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 10:28:27,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 10:28:27,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 10:28:27,066 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 10:28:27,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:27,066 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 10:28:27,066 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 10:28:27,066 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 10:28:27,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 10:28:27,068 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:27,068 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:27,068 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:27,068 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 10:28:27,068 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:27,069 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:27,069 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:27,069 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:27,069 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:27,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:27,087 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:27,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:27,155 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:27,155 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:27,156 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 10:28:27,159 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 10:28:27,208 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:28:27,208 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:28:27,960 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:28:27,961 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 10:28:27,978 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:28:27,978 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:27,978 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:27,988 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:27,988 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:28,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:28,024 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:28,125 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:28,126 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:28,384 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 10:28:28,419 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 10:28:28,419 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 8 [2018-01-21 10:28:28,419 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 10:28:28,420 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:28:28,420 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:28:28,420 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-01-21 10:28:28,420 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 10:28:28,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:28,529 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 10:28:28,529 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 10:28:28,530 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 10:28:28,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:28,531 INFO L225 Difference]: With dead ends: 86 [2018-01-21 10:28:28,531 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 10:28:28,532 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-01-21 10:28:28,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 10:28:28,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-01-21 10:28:28,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 10:28:28,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-01-21 10:28:28,538 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 34 [2018-01-21 10:28:28,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:28,539 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-01-21 10:28:28,539 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:28:28,539 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-01-21 10:28:28,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 10:28:28,541 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:28,541 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:28,541 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:28,541 INFO L82 PathProgramCache]: Analyzing trace with hash 2113336574, now seen corresponding path program 1 times [2018-01-21 10:28:28,541 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:28,543 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,543 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:28,543 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:28,543 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:28,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:28,563 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:28,606 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:28,607 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:28,607 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:28,608 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 10:28:28,608 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 10:28:28,610 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 10:28:28,610 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 10:28:29,173 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 10:28:29,173 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 10:28:29,185 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 10:28:29,185 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,186 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:29,201 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:29,201 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:29,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:29,224 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:29,237 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,280 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:29,315 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,316 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:29,320 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:29,320 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:29,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:29,368 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,380 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:29,381 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,400 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 10:28:29,401 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:29,402 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 10:28:29,402 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:29,402 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 10:28:29,402 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 10:28:29,402 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:28:29,403 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 5 states. [2018-01-21 10:28:29,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:29,539 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-21 10:28:29,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 10:28:29,539 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 10:28:29,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:29,540 INFO L225 Difference]: With dead ends: 94 [2018-01-21 10:28:29,541 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 10:28:29,541 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 10:28:29,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 10:28:29,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-01-21 10:28:29,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 10:28:29,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-01-21 10:28:29,550 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 39 [2018-01-21 10:28:29,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:29,550 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-01-21 10:28:29,551 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 10:28:29,551 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-01-21 10:28:29,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 10:28:29,554 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:29,554 INFO L322 BasicCegarLoop]: trace histogram [4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:29,554 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:29,554 INFO L82 PathProgramCache]: Analyzing trace with hash -1575876768, now seen corresponding path program 2 times [2018-01-21 10:28:29,554 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:29,555 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:29,556 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:29,556 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:29,556 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:29,580 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:29,582 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:29,646 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:29,646 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,646 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:29,646 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:29,647 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:29,647 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,647 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:29,654 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:29,654 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:29,665 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:29,674 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:29,680 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:29,683 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:29,788 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:28:29,788 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:29,909 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 25 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-01-21 10:28:29,946 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:29,946 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:29,949 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:29,949 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:29,966 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:29,984 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:29,996 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:30,001 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:30,018 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:30,019 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,127 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2018-01-21 10:28:30,129 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:30,129 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 10:28:30,129 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:30,130 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:28:30,130 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:28:30,130 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 10:28:30,130 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 10 states. [2018-01-21 10:28:30,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:30,291 INFO L93 Difference]: Finished difference Result 164 states and 184 transitions. [2018-01-21 10:28:30,292 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 10:28:30,292 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2018-01-21 10:28:30,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:30,294 INFO L225 Difference]: With dead ends: 164 [2018-01-21 10:28:30,294 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 10:28:30,295 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 10:28:30,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 10:28:30,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 86. [2018-01-21 10:28:30,305 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 10:28:30,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2018-01-21 10:28:30,306 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 57 [2018-01-21 10:28:30,306 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:30,306 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2018-01-21 10:28:30,307 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:28:30,307 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2018-01-21 10:28:30,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 10:28:30,308 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:30,309 INFO L322 BasicCegarLoop]: trace histogram [8, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:30,309 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:30,309 INFO L82 PathProgramCache]: Analyzing trace with hash -1577101506, now seen corresponding path program 3 times [2018-01-21 10:28:30,309 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:30,310 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,310 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:30,310 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,310 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:30,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:30,339 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:30,420 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:30,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,420 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:30,420 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:30,420 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:30,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,421 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:30,425 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:30,426 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:30,438 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,452 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,459 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,476 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,480 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:30,483 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:30,507 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:30,507 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,574 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:30,595 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:30,595 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:30,598 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:30,598 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:30,611 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,620 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,635 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,668 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:30,687 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:30,695 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:30,708 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:30,708 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:30,780 INFO L134 CoverageAnalysis]: Checked inductivity of 125 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2018-01-21 10:28:30,783 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:30,783 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 10:28:30,783 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:30,784 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 10:28:30,784 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 10:28:30,784 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:28:30,784 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand 7 states. [2018-01-21 10:28:30,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:30,858 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-01-21 10:28:30,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 10:28:30,858 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 85 [2018-01-21 10:28:30,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:30,860 INFO L225 Difference]: With dead ends: 154 [2018-01-21 10:28:30,860 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 10:28:30,860 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 335 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 10:28:30,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 10:28:30,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 10:28:30,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 10:28:30,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-01-21 10:28:30,870 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 85 [2018-01-21 10:28:30,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:30,870 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-01-21 10:28:30,870 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 10:28:30,870 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-01-21 10:28:30,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-01-21 10:28:30,872 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:30,872 INFO L322 BasicCegarLoop]: trace histogram [11, 7, 7, 7, 7, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:30,872 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:30,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1323929276, now seen corresponding path program 4 times [2018-01-21 10:28:30,872 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:30,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,873 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:30,873 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:30,873 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:30,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:30,906 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:31,025 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 0 proven. 50 refuted. 0 times theorem prover too weak. 197 trivial. 0 not checked. [2018-01-21 10:28:31,025 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,025 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:31,025 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:31,026 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:31,026 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,026 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:31,034 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:31,034 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:31,069 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:31,072 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:31,135 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:28:31,135 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:31,263 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 10:28:31,284 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:31,284 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:31,287 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:31,287 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:31,334 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:31,339 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:31,358 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 188 proven. 9 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2018-01-21 10:28:31,358 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:31,528 INFO L134 CoverageAnalysis]: Checked inductivity of 247 backedges. 98 proven. 42 refuted. 0 times theorem prover too weak. 107 trivial. 0 not checked. [2018-01-21 10:28:31,529 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:31,530 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 10:28:31,530 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:31,530 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 10:28:31,530 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 10:28:31,531 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:28:31,531 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 14 states. [2018-01-21 10:28:31,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:31,785 INFO L93 Difference]: Finished difference Result 262 states and 293 transitions. [2018-01-21 10:28:31,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 10:28:31,786 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 108 [2018-01-21 10:28:31,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:31,787 INFO L225 Difference]: With dead ends: 262 [2018-01-21 10:28:31,787 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 10:28:31,788 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 412 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2018-01-21 10:28:31,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 10:28:31,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 131. [2018-01-21 10:28:31,802 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 10:28:31,803 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 10:28:31,803 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 108 [2018-01-21 10:28:31,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:31,803 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 10:28:31,803 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 10:28:31,803 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 10:28:31,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 10:28:31,806 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:31,806 INFO L322 BasicCegarLoop]: trace histogram [17, 12, 12, 12, 12, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:31,807 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:31,807 INFO L82 PathProgramCache]: Analyzing trace with hash -481631070, now seen corresponding path program 5 times [2018-01-21 10:28:31,807 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:31,808 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:31,808 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:31,808 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:31,808 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:31,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:31,841 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:32,018 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 0 proven. 80 refuted. 0 times theorem prover too weak. 510 trivial. 0 not checked. [2018-01-21 10:28:32,018 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:32,018 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:32,018 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:32,018 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:32,018 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:32,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:32,025 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:32,025 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:32,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,039 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,040 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,042 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,047 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,052 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,058 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,059 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:32,063 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:32,169 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 382 proven. 100 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-01-21 10:28:32,169 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:32,386 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 183 proven. 188 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2018-01-21 10:28:32,406 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:32,406 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:32,409 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:32,409 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:32,422 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,425 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,432 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,441 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,458 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,498 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,580 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:32,597 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:32,604 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:32,660 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 385 proven. 118 refuted. 0 times theorem prover too weak. 87 trivial. 0 not checked. [2018-01-21 10:28:32,660 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:32,878 INFO L134 CoverageAnalysis]: Checked inductivity of 590 backedges. 191 proven. 218 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-01-21 10:28:32,879 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:32,880 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13, 13, 13] total 28 [2018-01-21 10:28:32,880 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:32,880 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 10:28:32,880 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 10:28:32,881 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2018-01-21 10:28:32,881 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 19 states. [2018-01-21 10:28:33,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:33,346 INFO L93 Difference]: Finished difference Result 312 states and 349 transitions. [2018-01-21 10:28:33,346 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 10:28:33,346 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 146 [2018-01-21 10:28:33,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:33,348 INFO L225 Difference]: With dead ends: 312 [2018-01-21 10:28:33,348 INFO L226 Difference]: Without dead ends: 234 [2018-01-21 10:28:33,349 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 554 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 10:28:33,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-01-21 10:28:33,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 169. [2018-01-21 10:28:33,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-01-21 10:28:33,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 188 transitions. [2018-01-21 10:28:33,361 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 188 transitions. Word has length 146 [2018-01-21 10:28:33,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:33,361 INFO L432 AbstractCegarLoop]: Abstraction has 169 states and 188 transitions. [2018-01-21 10:28:33,361 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 10:28:33,362 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 188 transitions. [2018-01-21 10:28:33,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 10:28:33,363 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:33,363 INFO L322 BasicCegarLoop]: trace histogram [24, 18, 18, 18, 18, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:33,363 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:33,363 INFO L82 PathProgramCache]: Analyzing trace with hash -75359012, now seen corresponding path program 6 times [2018-01-21 10:28:33,364 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:33,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:33,364 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:33,364 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:33,364 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:33,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:33,398 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:33,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:33,594 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:33,594 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:33,594 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:33,594 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:33,594 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:33,594 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:33,605 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:33,605 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:33,624 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,629 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,634 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,637 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,643 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,651 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,660 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,671 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,682 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:33,684 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:33,691 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:33,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:33,728 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:33,940 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:33,971 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:33,971 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:33,974 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:33,974 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:33,992 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,001 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,015 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,028 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,047 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,079 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,128 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,198 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,422 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:34,453 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:34,461 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:34,491 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:34,492 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:34,562 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 117 refuted. 0 times theorem prover too weak. 1071 trivial. 0 not checked. [2018-01-21 10:28:34,564 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:34,564 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 10:28:34,565 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:34,565 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 10:28:34,565 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 10:28:34,565 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:28:34,566 INFO L87 Difference]: Start difference. First operand 169 states and 188 transitions. Second operand 10 states. [2018-01-21 10:28:34,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:34,654 INFO L93 Difference]: Finished difference Result 267 states and 298 transitions. [2018-01-21 10:28:34,654 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 10:28:34,654 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 189 [2018-01-21 10:28:34,655 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:34,657 INFO L225 Difference]: With dead ends: 267 [2018-01-21 10:28:34,657 INFO L226 Difference]: Without dead ends: 224 [2018-01-21 10:28:34,658 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 10:28:34,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-01-21 10:28:34,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 181. [2018-01-21 10:28:34,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 10:28:34,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2018-01-21 10:28:34,673 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 189 [2018-01-21 10:28:34,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:34,674 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2018-01-21 10:28:34,674 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 10:28:34,674 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2018-01-21 10:28:34,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-01-21 10:28:34,677 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:34,677 INFO L322 BasicCegarLoop]: trace histogram [29, 22, 22, 22, 22, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:34,677 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:34,677 INFO L82 PathProgramCache]: Analyzing trace with hash -520842402, now seen corresponding path program 7 times [2018-01-21 10:28:34,678 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:34,678 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:34,679 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:34,679 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:34,679 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:34,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:34,713 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:34,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 0 proven. 161 refuted. 0 times theorem prover too weak. 1589 trivial. 0 not checked. [2018-01-21 10:28:34,923 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:34,923 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:34,924 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:34,924 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:34,924 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:34,924 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:34,942 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:34,942 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:35,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:35,012 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:35,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 10:28:35,199 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:35,402 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 10:28:35,422 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:35,422 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:35,426 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:35,426 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 10:28:35,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:35,520 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:35,559 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 1170 proven. 38 refuted. 0 times theorem prover too weak. 542 trivial. 0 not checked. [2018-01-21 10:28:35,559 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:35,734 INFO L134 CoverageAnalysis]: Checked inductivity of 1750 backedges. 414 proven. 240 refuted. 0 times theorem prover too weak. 1096 trivial. 0 not checked. [2018-01-21 10:28:35,735 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:35,736 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 10:28:35,736 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:35,736 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 10:28:35,736 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 10:28:35,737 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 10:28:35,737 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand 21 states. [2018-01-21 10:28:36,132 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:36,132 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2018-01-21 10:28:36,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 10:28:36,133 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 222 [2018-01-21 10:28:36,133 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:36,135 INFO L225 Difference]: With dead ends: 470 [2018-01-21 10:28:36,135 INFO L226 Difference]: Without dead ends: 367 [2018-01-21 10:28:36,136 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 908 GetRequests, 858 SyntacticMatches, 14 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 445 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=1136, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:28:36,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-01-21 10:28:36,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 224. [2018-01-21 10:28:36,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2018-01-21 10:28:36,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 251 transitions. [2018-01-21 10:28:36,154 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 251 transitions. Word has length 222 [2018-01-21 10:28:36,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:36,154 INFO L432 AbstractCegarLoop]: Abstraction has 224 states and 251 transitions. [2018-01-21 10:28:36,154 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 10:28:36,154 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 251 transitions. [2018-01-21 10:28:36,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 10:28:36,158 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:36,158 INFO L322 BasicCegarLoop]: trace histogram [38, 30, 30, 30, 30, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:36,158 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:36,158 INFO L82 PathProgramCache]: Analyzing trace with hash -1579608284, now seen corresponding path program 8 times [2018-01-21 10:28:36,159 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:36,159 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:36,160 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 10:28:36,160 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:36,160 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:36,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:36,198 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:36,487 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 0 proven. 212 refuted. 0 times theorem prover too weak. 2823 trivial. 0 not checked. [2018-01-21 10:28:36,488 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:36,488 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:36,488 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:36,488 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:36,488 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:36,488 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:36,493 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:36,493 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:36,511 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:36,539 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:36,545 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:36,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:36,719 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 10:28:36,719 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:36,999 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 10:28:37,019 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:37,019 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:37,022 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 10:28:37,022 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:37,046 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:37,098 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:37,137 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:37,147 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:37,187 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 1945 proven. 60 refuted. 0 times theorem prover too weak. 1030 trivial. 0 not checked. [2018-01-21 10:28:37,187 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:37,461 INFO L134 CoverageAnalysis]: Checked inductivity of 3035 backedges. 673 proven. 360 refuted. 0 times theorem prover too weak. 2002 trivial. 0 not checked. [2018-01-21 10:28:37,463 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:37,463 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 10:28:37,463 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:37,464 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 10:28:37,464 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 10:28:37,464 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:28:37,465 INFO L87 Difference]: Start difference. First operand 224 states and 251 transitions. Second operand 24 states. [2018-01-21 10:28:38,158 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:38,159 INFO L93 Difference]: Finished difference Result 579 states and 648 transitions. [2018-01-21 10:28:38,159 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 10:28:38,159 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-01-21 10:28:38,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:38,162 INFO L225 Difference]: With dead ends: 579 [2018-01-21 10:28:38,162 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 10:28:38,164 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 1065 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 10:28:38,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 10:28:38,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 272. [2018-01-21 10:28:38,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-01-21 10:28:38,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 306 transitions. [2018-01-21 10:28:38,187 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 306 transitions. Word has length 275 [2018-01-21 10:28:38,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:38,187 INFO L432 AbstractCegarLoop]: Abstraction has 272 states and 306 transitions. [2018-01-21 10:28:38,187 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 10:28:38,188 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 306 transitions. [2018-01-21 10:28:38,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 10:28:38,193 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:38,193 INFO L322 BasicCegarLoop]: trace histogram [48, 39, 39, 39, 39, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:38,194 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:38,194 INFO L82 PathProgramCache]: Analyzing trace with hash -1321832962, now seen corresponding path program 9 times [2018-01-21 10:28:38,194 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:38,195 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:38,195 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:38,195 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:38,195 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:38,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:38,240 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:38,518 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 4623 trivial. 0 not checked. [2018-01-21 10:28:38,518 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:38,518 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:38,518 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:38,518 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:38,518 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:38,519 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:38,524 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:38,524 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:38,545 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,549 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,552 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,557 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,563 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,570 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,576 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,583 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:38,585 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:38,589 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:38,724 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 10:28:38,724 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:39,099 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 10:28:39,134 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:39,134 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:39,137 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 10:28:39,138 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 10:28:39,169 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,179 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,193 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,215 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,254 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,329 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,456 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,749 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 10:28:39,788 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:39,796 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:39,852 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 10:28:39,852 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:40,147 INFO L134 CoverageAnalysis]: Checked inductivity of 4893 backedges. 1242 proven. 87 refuted. 0 times theorem prover too weak. 3564 trivial. 0 not checked. [2018-01-21 10:28:40,149 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:40,150 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 10:28:40,150 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:40,151 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 10:28:40,151 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 10:28:40,151 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 10:28:40,151 INFO L87 Difference]: Start difference. First operand 272 states and 306 transitions. Second operand 20 states. [2018-01-21 10:28:40,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:40,603 INFO L93 Difference]: Finished difference Result 669 states and 759 transitions. [2018-01-21 10:28:40,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 10:28:40,604 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 333 [2018-01-21 10:28:40,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:40,609 INFO L225 Difference]: With dead ends: 669 [2018-01-21 10:28:40,609 INFO L226 Difference]: Without dead ends: 611 [2018-01-21 10:28:40,611 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1349 GetRequests, 1312 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 10:28:40,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2018-01-21 10:28:40,634 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 333. [2018-01-21 10:28:40,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-01-21 10:28:40,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 380 transitions. [2018-01-21 10:28:40,637 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 380 transitions. Word has length 333 [2018-01-21 10:28:40,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:40,638 INFO L432 AbstractCegarLoop]: Abstraction has 333 states and 380 transitions. [2018-01-21 10:28:40,638 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 10:28:40,638 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 380 transitions. [2018-01-21 10:28:40,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-01-21 10:28:40,641 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:40,641 INFO L322 BasicCegarLoop]: trace histogram [59, 49, 49, 49, 49, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:40,642 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:40,642 INFO L82 PathProgramCache]: Analyzing trace with hash -626287868, now seen corresponding path program 10 times [2018-01-21 10:28:40,642 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:40,643 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:40,643 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:40,643 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:40,643 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:40,690 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:41,077 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 0 proven. 335 refuted. 0 times theorem prover too weak. 7130 trivial. 0 not checked. [2018-01-21 10:28:41,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:41,077 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:41,077 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:41,077 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:41,077 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:41,077 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:41,085 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:41,085 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:41,189 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:41,197 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:41,459 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 10:28:41,459 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:41,928 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 10:28:41,949 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:41,949 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:41,952 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 10:28:41,953 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 10:28:42,109 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:42,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:42,210 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 4395 proven. 119 refuted. 0 times theorem prover too weak. 2951 trivial. 0 not checked. [2018-01-21 10:28:42,210 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:42,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7465 backedges. 1485 proven. 675 refuted. 0 times theorem prover too weak. 5305 trivial. 0 not checked. [2018-01-21 10:28:42,453 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:42,453 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 10:28:42,453 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:42,454 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 10:28:42,454 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 10:28:42,455 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 10:28:42,455 INFO L87 Difference]: Start difference. First operand 333 states and 380 transitions. Second operand 30 states. [2018-01-21 10:28:43,455 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:43,455 INFO L93 Difference]: Finished difference Result 877 states and 999 transitions. [2018-01-21 10:28:43,455 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 10:28:43,455 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 396 [2018-01-21 10:28:43,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:43,460 INFO L225 Difference]: With dead ends: 877 [2018-01-21 10:28:43,460 INFO L226 Difference]: Without dead ends: 721 [2018-01-21 10:28:43,462 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1613 GetRequests, 1539 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 10:28:43,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2018-01-21 10:28:43,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 391. [2018-01-21 10:28:43,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-01-21 10:28:43,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2018-01-21 10:28:43,496 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 396 [2018-01-21 10:28:43,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:43,496 INFO L432 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2018-01-21 10:28:43,497 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 10:28:43,497 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2018-01-21 10:28:43,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2018-01-21 10:28:43,500 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:43,500 INFO L322 BasicCegarLoop]: trace histogram [70, 59, 59, 59, 59, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:43,501 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:43,501 INFO L82 PathProgramCache]: Analyzing trace with hash 91735614, now seen corresponding path program 11 times [2018-01-21 10:28:43,501 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:43,502 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:43,502 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:43,502 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:43,502 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:43,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:43,550 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:44,042 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 0 proven. 407 refuted. 0 times theorem prover too weak. 10183 trivial. 0 not checked. [2018-01-21 10:28:44,042 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:44,042 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:44,042 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:44,043 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:44,043 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:44,043 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:44,049 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:44,050 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:44,084 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,090 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,098 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,108 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,120 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,133 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,148 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,158 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:44,159 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:44,166 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:44,464 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 10:28:44,464 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:45,013 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 10:28:45,043 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:45,043 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:45,047 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 10:28:45,047 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 10:28:45,078 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:45,118 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:45,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:45,184 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:45,275 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:46,916 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:51,519 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:51,849 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 10:28:51,896 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:51,905 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:51,998 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 6206 proven. 427 refuted. 0 times theorem prover too weak. 3957 trivial. 0 not checked. [2018-01-21 10:28:51,998 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:52,332 INFO L134 CoverageAnalysis]: Checked inductivity of 10590 backedges. 1061 proven. 1932 refuted. 0 times theorem prover too weak. 7597 trivial. 0 not checked. [2018-01-21 10:28:52,335 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 10:28:52,336 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 40 [2018-01-21 10:28:52,336 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 10:28:52,336 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 10:28:52,337 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 10:28:52,337 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 10:28:52,337 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand 31 states. [2018-01-21 10:28:54,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 10:28:54,276 INFO L93 Difference]: Finished difference Result 966 states and 1091 transitions. [2018-01-21 10:28:54,276 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 10:28:54,276 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 459 [2018-01-21 10:28:54,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 10:28:54,278 INFO L225 Difference]: With dead ends: 966 [2018-01-21 10:28:54,278 INFO L226 Difference]: Without dead ends: 554 [2018-01-21 10:28:54,281 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1888 GetRequests, 1801 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 10:28:54,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-01-21 10:28:54,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 395. [2018-01-21 10:28:54,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2018-01-21 10:28:54,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 440 transitions. [2018-01-21 10:28:54,299 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 440 transitions. Word has length 459 [2018-01-21 10:28:54,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 10:28:54,299 INFO L432 AbstractCegarLoop]: Abstraction has 395 states and 440 transitions. [2018-01-21 10:28:54,299 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 10:28:54,300 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 440 transitions. [2018-01-21 10:28:54,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-01-21 10:28:54,302 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 10:28:54,302 INFO L322 BasicCegarLoop]: trace histogram [80, 68, 68, 68, 68, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 10:28:54,302 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 10:28:54,303 INFO L82 PathProgramCache]: Analyzing trace with hash 1309279644, now seen corresponding path program 12 times [2018-01-21 10:28:54,303 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 10:28:54,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:54,303 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 10:28:54,304 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 10:28:54,304 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 10:28:54,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 10:28:54,343 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 10:28:55,238 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 13418 trivial. 0 not checked. [2018-01-21 10:28:55,239 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:55,264 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 10:28:55,264 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 10:28:55,264 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 10:28:55,264 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:55,264 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 10:28:55,269 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:55,269 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:55,296 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,305 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,311 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,317 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,325 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,334 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,344 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,359 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,374 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,385 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,406 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,421 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,436 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,455 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,473 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,532 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,564 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,616 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:55,618 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 10:28:55,624 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 10:28:55,828 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 10:28:55,828 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 10:28:56,338 INFO L134 CoverageAnalysis]: Checked inductivity of 13904 backedges. 2819 proven. 156 refuted. 0 times theorem prover too weak. 10929 trivial. 0 not checked. [2018-01-21 10:28:56,359 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 10:28:56,360 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 10:28:56,362 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 10:28:56,363 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 10:28:56,397 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:56,407 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:56,433 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:28:56,473 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:02,300 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 10:29:14,333 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown