java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:00:04,923 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:00:04,925 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:00:04,942 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:00:04,942 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:00:04,943 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:00:04,944 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:00:04,946 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:00:04,948 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:00:04,949 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:00:04,950 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:00:04,950 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:00:04,951 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:00:04,953 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:00:04,954 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:00:04,956 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:00:04,958 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:00:04,960 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:00:04,961 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:00:04,963 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:00:04,965 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:00:04,965 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:00:04,965 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:00:04,966 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:00:04,967 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:00:04,968 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:00:04,968 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:00:04,969 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:00:04,969 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:00:04,969 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:00:04,970 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:00:04,970 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf [2018-01-21 06:00:04,980 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:00:04,980 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:00:04,981 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:00:04,981 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:00:04,982 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:00:04,982 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:00:04,982 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:00:04,982 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:00:04,983 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:00:04,983 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:00:04,983 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:00:04,983 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:00:04,984 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:00:04,984 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:00:04,984 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:00:04,984 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:00:04,984 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:00:04,985 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:00:04,985 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:00:04,985 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:00:04,985 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:00:04,985 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:00:04,986 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:00:04,986 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:00:04,986 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:00:04,986 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:00:04,986 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:00:04,987 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:00:04,987 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:00:04,987 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:00:04,987 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:00:04,987 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:00:04,988 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:00:04,988 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:00:04,988 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:00:04,988 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:00:04,988 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:00:04,989 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:00:04,989 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:00:05,021 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:00:05,031 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:00:05,034 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:00:05,035 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:00:05,035 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:00:05,036 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 06:00:05,145 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:00:05,150 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:00:05,150 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:00:05,151 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:00:05,156 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:00:05,157 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,160 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 06:00:05, skipping insertion in model container [2018-01-21 06:00:05,160 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,174 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:00:05,188 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:00:05,300 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:00:05,316 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:00:05,323 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05 WrapperNode [2018-01-21 06:00:05,323 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:00:05,324 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:00:05,324 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:00:05,325 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:00:05,338 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,338 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,345 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,346 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,349 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,352 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,353 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... [2018-01-21 06:00:05,355 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:00:05,355 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:00:05,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:00:05,355 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:00:05,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:00:05,399 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:00:05,399 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:00:05,399 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:00:05,399 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:00:05,399 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:00:05,400 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:00:05,401 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:00:05,401 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:00:05,559 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:00:05,559 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:00:05 BoogieIcfgContainer [2018-01-21 06:00:05,560 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:00:05,560 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:00:05,560 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:00:05,562 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:00:05,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:00:05" (1/3) ... [2018-01-21 06:00:05,563 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 06:00:05, skipping insertion in model container [2018-01-21 06:00:05,563 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:00:05" (2/3) ... [2018-01-21 06:00:05,563 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 06:00:05, skipping insertion in model container [2018-01-21 06:00:05,564 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:00:05" (3/3) ... [2018-01-21 06:00:05,565 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength_false-valid-deref-write.c [2018-01-21 06:00:05,573 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:00:05,578 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:00:05,617 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:05,617 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:05,617 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:05,618 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:05,618 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:05,618 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:05,618 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:05,618 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:00:05,619 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:05,640 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:00:05,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:00:05,647 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:05,648 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:00:05,648 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:00:05,653 INFO L82 PathProgramCache]: Analyzing trace with hash 103790, now seen corresponding path program 1 times [2018-01-21 06:00:05,656 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:05,703 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,703 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:05,703 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,703 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:05,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:00:05,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:00:05,757 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:00:05,763 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:00:05,769 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:05,769 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:05,770 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:05,770 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:05,770 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:05,770 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:05,770 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:05,770 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:00:05,770 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:05,773 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:00:05,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:00:05,774 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:05,774 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:05,774 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:00:05,775 INFO L82 PathProgramCache]: Analyzing trace with hash -125735921, now seen corresponding path program 1 times [2018-01-21 06:00:05,775 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:05,776 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,776 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:05,777 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,777 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:05,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:05,803 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:05,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:00:05,837 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:05,837 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:00:05,838 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:05,839 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:00:05,849 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:00:05,850 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:05,851 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 06:00:05,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:05,883 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 06:00:05,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:00:05,885 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:00:05,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:05,894 INFO L225 Difference]: With dead ends: 78 [2018-01-21 06:00:05,895 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:00:05,898 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:05,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:00:05,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:00:05,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:00:05,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:00:05,988 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:00:05,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:05,988 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:00:05,989 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:00:05,989 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:00:05,989 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:00:05,991 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:00:05,991 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:00:05,991 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:00:05,991 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:00:05,991 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:00:05,991 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:00:05,991 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:00:05,992 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:00:05,992 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:00:05,993 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states. [2018-01-21 06:00:05,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:00:05,994 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:05,994 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:05,994 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:05,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1491711838, now seen corresponding path program 1 times [2018-01-21 06:00:05,995 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:05,996 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,996 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:05,996 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:05,996 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:06,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:06,004 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:06,012 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:00:06,013 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:06,013 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:00:06,013 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:06,013 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:00:06,013 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:00:06,013 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:06,014 INFO L87 Difference]: Start difference. First operand 44 states. Second operand 2 states. [2018-01-21 06:00:06,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:06,018 INFO L93 Difference]: Finished difference Result 78 states and 92 transitions. [2018-01-21 06:00:06,018 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:00:06,018 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:00:06,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:06,020 INFO L225 Difference]: With dead ends: 78 [2018-01-21 06:00:06,020 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 06:00:06,021 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:00:06,021 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 06:00:06,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 06:00:06,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 06:00:06,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2018-01-21 06:00:06,032 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 17 [2018-01-21 06:00:06,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:06,032 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2018-01-21 06:00:06,032 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:00:06,032 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2018-01-21 06:00:06,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:00:06,033 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:06,033 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:06,033 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:06,034 INFO L82 PathProgramCache]: Analyzing trace with hash -1603848178, now seen corresponding path program 1 times [2018-01-21 06:00:06,034 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:06,034 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:06,035 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:06,035 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:06,035 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:06,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:06,047 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:06,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:00:06,077 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:00:06,077 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:00:06,077 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:06,079 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:00:06,079 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:00:06,080 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:00:06,080 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 3 states. [2018-01-21 06:00:06,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:06,145 INFO L93 Difference]: Finished difference Result 73 states and 81 transitions. [2018-01-21 06:00:06,146 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:00:06,146 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:00:06,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:06,150 INFO L225 Difference]: With dead ends: 73 [2018-01-21 06:00:06,150 INFO L226 Difference]: Without dead ends: 57 [2018-01-21 06:00:06,151 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:00:06,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-01-21 06:00:06,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 44. [2018-01-21 06:00:06,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 06:00:06,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 47 transitions. [2018-01-21 06:00:06,165 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 47 transitions. Word has length 19 [2018-01-21 06:00:06,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:06,165 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 47 transitions. [2018-01-21 06:00:06,165 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:00:06,166 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 47 transitions. [2018-01-21 06:00:06,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 06:00:06,167 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:06,167 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:00:06,167 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:06,167 INFO L82 PathProgramCache]: Analyzing trace with hash -428436962, now seen corresponding path program 1 times [2018-01-21 06:00:06,168 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:06,168 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:06,168 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:06,169 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:06,169 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:06,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:06,186 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:06,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:00:06,242 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:06,242 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:06,243 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 35 with the following transitions: [2018-01-21 06:00:06,245 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 06:00:06,291 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:00:06,291 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:00:07,968 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:00:07,969 INFO L268 AbstractInterpreter]: Visited 33 different actions 57 times. Merged at 17 different actions 17 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 21 variables. [2018-01-21 06:00:07,995 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:00:07,995 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:07,995 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:08,014 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:08,014 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:08,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:08,048 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:08,205 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 06:00:08,205 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:08,373 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 06:00:08,406 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:00:08,406 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 8 [2018-01-21 06:00:08,406 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:00:08,407 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:00:08,407 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:00:08,407 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2018-01-21 06:00:08,408 INFO L87 Difference]: Start difference. First operand 44 states and 47 transitions. Second operand 5 states. [2018-01-21 06:00:08,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:08,551 INFO L93 Difference]: Finished difference Result 86 states and 93 transitions. [2018-01-21 06:00:08,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:00:08,551 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 34 [2018-01-21 06:00:08,552 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:08,553 INFO L225 Difference]: With dead ends: 86 [2018-01-21 06:00:08,553 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 06:00:08,553 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:00:08,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 06:00:08,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2018-01-21 06:00:08,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 06:00:08,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2018-01-21 06:00:08,559 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 34 [2018-01-21 06:00:08,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:08,560 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2018-01-21 06:00:08,560 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:00:08,560 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2018-01-21 06:00:08,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 06:00:08,561 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:08,562 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 06:00:08,562 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:08,564 INFO L82 PathProgramCache]: Analyzing trace with hash 2113336574, now seen corresponding path program 1 times [2018-01-21 06:00:08,564 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:08,566 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:08,566 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:08,566 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:08,566 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:08,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:08,585 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:08,628 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 06:00:08,628 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:08,628 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:08,628 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 40 with the following transitions: [2018-01-21 06:00:08,628 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [41], [42], [44], [48], [52], [57], [58], [61], [63], [64], [65], [75], [77], [78], [79], [80], [81], [82] [2018-01-21 06:00:08,630 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:00:08,630 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:00:09,962 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:00:09,963 INFO L268 AbstractInterpreter]: Visited 37 different actions 91 times. Merged at 25 different actions 41 times. Never widened. Found 6 fixpoints after 3 different actions. Largest state had 23 variables. [2018-01-21 06:00:09,964 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:00:09,964 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:09,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 06:00:09,980 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:09,980 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:10,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:10,010 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:10,072 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 06:00:10,072 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:10,136 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 06:00:10,171 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:10,171 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 06:00:10,176 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:10,176 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:10,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:10,215 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:10,221 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 06:00:10,221 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:10,264 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 06:00:10,267 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:10,267 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 7 [2018-01-21 06:00:10,267 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:10,268 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 06:00:10,268 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 06:00:10,268 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2018-01-21 06:00:10,268 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 5 states. [2018-01-21 06:00:10,346 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:10,347 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2018-01-21 06:00:10,347 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 06:00:10,347 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 39 [2018-01-21 06:00:10,347 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:10,349 INFO L225 Difference]: With dead ends: 94 [2018-01-21 06:00:10,349 INFO L226 Difference]: Without dead ends: 76 [2018-01-21 06:00:10,349 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 06:00:10,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2018-01-21 06:00:10,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 58. [2018-01-21 06:00:10,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-01-21 06:00:10,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 63 transitions. [2018-01-21 06:00:10,358 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 63 transitions. Word has length 39 [2018-01-21 06:00:10,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:10,358 INFO L432 AbstractCegarLoop]: Abstraction has 58 states and 63 transitions. [2018-01-21 06:00:10,358 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 06:00:10,358 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 63 transitions. [2018-01-21 06:00:10,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-01-21 06:00:10,361 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:10,361 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 06:00:10,361 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:10,362 INFO L82 PathProgramCache]: Analyzing trace with hash -1575876768, now seen corresponding path program 2 times [2018-01-21 06:00:10,362 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:10,363 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:10,363 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:10,363 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:10,363 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:10,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:10,386 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:10,430 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 06:00:10,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:10,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:10,431 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:10,431 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:10,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:10,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:10,438 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:10,438 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:10,450 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:10,460 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:10,462 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:10,465 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:10,526 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 06:00:10,526 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:10,638 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 06:00:10,659 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:10,659 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:10,662 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:10,662 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:10,677 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:10,692 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:10,703 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:10,707 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:10,723 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 06:00:10,724 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:10,788 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 06:00:10,789 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:10,789 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7, 5, 5] total 16 [2018-01-21 06:00:10,789 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:10,790 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:00:10,790 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:00:10,790 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=181, Unknown=0, NotChecked=0, Total=240 [2018-01-21 06:00:10,790 INFO L87 Difference]: Start difference. First operand 58 states and 63 transitions. Second operand 10 states. [2018-01-21 06:00:10,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:10,936 INFO L93 Difference]: Finished difference Result 164 states and 184 transitions. [2018-01-21 06:00:10,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 06:00:10,937 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 57 [2018-01-21 06:00:10,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:10,938 INFO L225 Difference]: With dead ends: 164 [2018-01-21 06:00:10,939 INFO L226 Difference]: Without dead ends: 123 [2018-01-21 06:00:10,939 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 213 SyntacticMatches, 4 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:00:10,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-01-21 06:00:10,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 86. [2018-01-21 06:00:10,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2018-01-21 06:00:10,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2018-01-21 06:00:10,950 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 57 [2018-01-21 06:00:10,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:10,951 INFO L432 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2018-01-21 06:00:10,951 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:00:10,951 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2018-01-21 06:00:10,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2018-01-21 06:00:10,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:10,953 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 06:00:10,953 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:10,953 INFO L82 PathProgramCache]: Analyzing trace with hash -1577101506, now seen corresponding path program 3 times [2018-01-21 06:00:10,953 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:10,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:10,954 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:10,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:10,954 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:10,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:10,980 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:11,059 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 06:00:11,059 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,059 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:11,059 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:11,060 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:11,060 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,060 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:11,065 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:11,065 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:11,077 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,089 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,108 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,114 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,116 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:11,119 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:11,148 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 06:00:11,149 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:11,194 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 06:00:11,214 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,214 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:11,221 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:11,221 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:11,235 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,248 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,261 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,281 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:11,293 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:11,298 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:11,310 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 06:00:11,311 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:11,348 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 06:00:11,350 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:11,350 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 06:00:11,350 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:11,351 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 06:00:11,351 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 06:00:11,351 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:00:11,352 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand 7 states. [2018-01-21 06:00:11,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:11,411 INFO L93 Difference]: Finished difference Result 154 states and 171 transitions. [2018-01-21 06:00:11,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:00:11,412 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 85 [2018-01-21 06:00:11,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:11,413 INFO L225 Difference]: With dead ends: 154 [2018-01-21 06:00:11,413 INFO L226 Difference]: Without dead ends: 126 [2018-01-21 06:00:11,414 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 06:00:11,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2018-01-21 06:00:11,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 98. [2018-01-21 06:00:11,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-01-21 06:00:11,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-01-21 06:00:11,422 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 85 [2018-01-21 06:00:11,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:11,422 INFO L432 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-01-21 06:00:11,422 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 06:00:11,422 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-01-21 06:00:11,424 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2018-01-21 06:00:11,424 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:11,424 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 06:00:11,424 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:11,424 INFO L82 PathProgramCache]: Analyzing trace with hash 1323929276, now seen corresponding path program 4 times [2018-01-21 06:00:11,424 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:11,425 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:11,425 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:11,425 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:11,425 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:11,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:11,454 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:11,606 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 06:00:11,607 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,607 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:11,607 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:11,607 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:11,607 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,608 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:11,614 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:11,614 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:11,638 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:11,641 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:11,692 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 06:00:11,692 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:11,816 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 06:00:11,837 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:11,837 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:11,841 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:11,842 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:11,885 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:11,890 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:11,907 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 06:00:11,907 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:12,127 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 06:00:12,129 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:12,129 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9, 9, 9] total 17 [2018-01-21 06:00:12,129 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:12,130 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 06:00:12,130 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 06:00:12,130 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:00:12,130 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 14 states. [2018-01-21 06:00:12,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:12,397 INFO L93 Difference]: Finished difference Result 262 states and 293 transitions. [2018-01-21 06:00:12,397 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 06:00:12,397 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 108 [2018-01-21 06:00:12,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:12,398 INFO L225 Difference]: With dead ends: 262 [2018-01-21 06:00:12,398 INFO L226 Difference]: Without dead ends: 197 [2018-01-21 06:00:12,399 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 444 GetRequests, 412 SyntacticMatches, 10 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=119, Invalid=433, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:00:12,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 197 states. [2018-01-21 06:00:12,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 197 to 131. [2018-01-21 06:00:12,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 06:00:12,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 06:00:12,410 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 108 [2018-01-21 06:00:12,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:12,410 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 06:00:12,410 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 06:00:12,410 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 06:00:12,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2018-01-21 06:00:12,412 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:12,412 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 06:00:12,412 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:12,413 INFO L82 PathProgramCache]: Analyzing trace with hash -481631070, now seen corresponding path program 5 times [2018-01-21 06:00:12,413 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:12,413 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:12,413 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:12,413 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:12,413 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:12,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:12,446 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:12,609 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 06:00:12,610 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:12,610 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:12,610 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:12,610 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:12,610 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:12,610 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:12,618 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:12,618 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:12,634 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,639 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,642 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,649 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,657 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,665 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:12,667 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:12,672 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:12,852 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 06:00:12,852 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:13,121 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 06:00:13,142 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:13,165 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:13,168 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:13,168 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:13,182 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,186 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,202 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,219 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,261 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,346 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:13,363 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:13,368 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:13,438 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 06:00:13,438 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:13,700 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 06:00:13,702 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:13,702 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13, 13, 13] total 28 [2018-01-21 06:00:13,702 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:13,702 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 06:00:13,703 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 06:00:13,703 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=642, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:00:13,703 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 19 states. [2018-01-21 06:00:14,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:14,174 INFO L93 Difference]: Finished difference Result 312 states and 349 transitions. [2018-01-21 06:00:14,174 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 06:00:14,174 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 146 [2018-01-21 06:00:14,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:14,177 INFO L225 Difference]: With dead ends: 312 [2018-01-21 06:00:14,178 INFO L226 Difference]: Without dead ends: 234 [2018-01-21 06:00:14,179 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 610 GetRequests, 554 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 523 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=306, Invalid=1500, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 06:00:14,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-01-21 06:00:14,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 169. [2018-01-21 06:00:14,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2018-01-21 06:00:14,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 188 transitions. [2018-01-21 06:00:14,195 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 188 transitions. Word has length 146 [2018-01-21 06:00:14,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:14,196 INFO L432 AbstractCegarLoop]: Abstraction has 169 states and 188 transitions. [2018-01-21 06:00:14,196 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 06:00:14,196 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 188 transitions. [2018-01-21 06:00:14,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-01-21 06:00:14,198 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:14,198 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 06:00:14,198 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:14,198 INFO L82 PathProgramCache]: Analyzing trace with hash -75359012, now seen corresponding path program 6 times [2018-01-21 06:00:14,198 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:14,199 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:14,199 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:14,199 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:14,199 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:14,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:14,229 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:14,336 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 06:00:14,336 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:14,337 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:14,337 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:14,337 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:14,337 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:14,337 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:14,343 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:14,343 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:14,356 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,360 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,362 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,364 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,368 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,372 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,377 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,383 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,389 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,391 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:14,394 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:14,415 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 06:00:14,416 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:14,518 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 06:00:14,538 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:14,539 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:14,544 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:14,545 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:14,566 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,574 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,587 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,599 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,617 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,645 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,685 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,753 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:14,985 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:14,991 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:15,009 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 06:00:15,009 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:15,054 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 06:00:15,056 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:15,056 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 06:00:15,056 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:15,056 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:00:15,057 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:00:15,057 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:00:15,057 INFO L87 Difference]: Start difference. First operand 169 states and 188 transitions. Second operand 10 states. [2018-01-21 06:00:15,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:15,121 INFO L93 Difference]: Finished difference Result 267 states and 298 transitions. [2018-01-21 06:00:15,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 06:00:15,122 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 189 [2018-01-21 06:00:15,123 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:15,124 INFO L225 Difference]: With dead ends: 267 [2018-01-21 06:00:15,124 INFO L226 Difference]: Without dead ends: 224 [2018-01-21 06:00:15,125 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 748 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:00:15,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2018-01-21 06:00:15,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 181. [2018-01-21 06:00:15,138 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2018-01-21 06:00:15,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 202 transitions. [2018-01-21 06:00:15,140 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 202 transitions. Word has length 189 [2018-01-21 06:00:15,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:15,141 INFO L432 AbstractCegarLoop]: Abstraction has 181 states and 202 transitions. [2018-01-21 06:00:15,141 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:00:15,141 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 202 transitions. [2018-01-21 06:00:15,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 223 [2018-01-21 06:00:15,144 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:15,144 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 06:00:15,145 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:15,145 INFO L82 PathProgramCache]: Analyzing trace with hash -520842402, now seen corresponding path program 7 times [2018-01-21 06:00:15,145 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:15,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:15,146 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:15,146 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:15,146 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:15,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:15,178 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:15,399 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 06:00:15,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:15,400 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:15,400 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:15,400 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:15,400 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:15,400 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:15,408 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:15,408 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:15,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:15,477 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:15,645 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 06:00:15,645 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:15,883 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 06:00:15,903 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:15,903 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:15,906 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:15,906 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:00:15,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:15,999 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:16,043 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 06:00:16,043 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:16,270 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 06:00:16,271 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:16,272 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13, 13, 13, 13] total 26 [2018-01-21 06:00:16,272 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:16,272 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:00:16,273 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:00:16,273 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=522, Unknown=0, NotChecked=0, Total=650 [2018-01-21 06:00:16,273 INFO L87 Difference]: Start difference. First operand 181 states and 202 transitions. Second operand 21 states. [2018-01-21 06:00:16,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:16,684 INFO L93 Difference]: Finished difference Result 470 states and 526 transitions. [2018-01-21 06:00:16,685 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 06:00:16,685 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 222 [2018-01-21 06:00:16,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:16,687 INFO L225 Difference]: With dead ends: 470 [2018-01-21 06:00:16,687 INFO L226 Difference]: Without dead ends: 367 [2018-01-21 06:00:16,688 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 06:00:16,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 367 states. [2018-01-21 06:00:16,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 367 to 224. [2018-01-21 06:00:16,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2018-01-21 06:00:16,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 251 transitions. [2018-01-21 06:00:16,701 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 251 transitions. Word has length 222 [2018-01-21 06:00:16,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:16,701 INFO L432 AbstractCegarLoop]: Abstraction has 224 states and 251 transitions. [2018-01-21 06:00:16,701 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:00:16,701 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 251 transitions. [2018-01-21 06:00:16,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 276 [2018-01-21 06:00:16,705 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:16,705 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 06:00:16,705 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:16,706 INFO L82 PathProgramCache]: Analyzing trace with hash -1579608284, now seen corresponding path program 8 times [2018-01-21 06:00:16,706 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:16,706 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:16,707 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:00:16,707 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:16,707 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:16,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:16,744 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:16,964 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 06:00:16,965 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:16,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:16,965 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:16,965 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:16,965 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:16,965 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:16,970 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:16,970 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:16,987 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:17,013 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:17,018 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:17,022 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:17,177 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 06:00:17,177 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:17,437 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 06:00:17,456 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:17,457 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:17,459 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:00:17,460 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:17,482 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:17,532 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:17,572 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:17,581 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:17,619 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 06:00:17,619 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:17,849 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 06:00:17,851 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:17,851 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15, 15, 15, 15] total 30 [2018-01-21 06:00:17,851 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:17,851 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 06:00:17,852 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 06:00:17,852 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=704, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:00:17,852 INFO L87 Difference]: Start difference. First operand 224 states and 251 transitions. Second operand 24 states. [2018-01-21 06:00:18,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:18,554 INFO L93 Difference]: Finished difference Result 579 states and 648 transitions. [2018-01-21 06:00:18,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 06:00:18,554 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 275 [2018-01-21 06:00:18,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:18,556 INFO L225 Difference]: With dead ends: 579 [2018-01-21 06:00:18,556 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 06:00:18,557 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1123 GetRequests, 1065 SyntacticMatches, 16 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 615 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=352, Invalid=1540, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 06:00:18,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 06:00:18,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 272. [2018-01-21 06:00:18,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 272 states. [2018-01-21 06:00:18,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 306 transitions. [2018-01-21 06:00:18,573 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 306 transitions. Word has length 275 [2018-01-21 06:00:18,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:18,574 INFO L432 AbstractCegarLoop]: Abstraction has 272 states and 306 transitions. [2018-01-21 06:00:18,574 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 06:00:18,574 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 306 transitions. [2018-01-21 06:00:18,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 334 [2018-01-21 06:00:18,575 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:18,575 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 06:00:18,576 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:18,576 INFO L82 PathProgramCache]: Analyzing trace with hash -1321832962, now seen corresponding path program 9 times [2018-01-21 06:00:18,576 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:18,577 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:18,577 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:18,577 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:18,577 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:18,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:18,606 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:18,882 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 06:00:18,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:18,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:18,882 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:18,882 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:18,882 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:18,882 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:18,894 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:18,894 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:18,918 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,922 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,925 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,930 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,936 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,944 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,949 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,956 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:18,958 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:18,963 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:19,148 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 06:00:19,148 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:19,458 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 06:00:19,478 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:19,478 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:19,481 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:00:19,481 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:00:19,511 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,520 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,534 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,555 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,592 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,659 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:19,775 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:20,033 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:00:20,066 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:20,074 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:20,144 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 06:00:20,144 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:20,456 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 06:00:20,458 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:20,459 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 30 [2018-01-21 06:00:20,459 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:20,459 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 06:00:20,459 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 06:00:20,460 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=229, Invalid=641, Unknown=0, NotChecked=0, Total=870 [2018-01-21 06:00:20,460 INFO L87 Difference]: Start difference. First operand 272 states and 306 transitions. Second operand 20 states. [2018-01-21 06:00:20,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:20,858 INFO L93 Difference]: Finished difference Result 669 states and 759 transitions. [2018-01-21 06:00:20,859 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 06:00:20,859 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 333 [2018-01-21 06:00:20,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:20,863 INFO L225 Difference]: With dead ends: 669 [2018-01-21 06:00:20,863 INFO L226 Difference]: Without dead ends: 611 [2018-01-21 06:00:20,865 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1349 GetRequests, 1312 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 06:00:20,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 611 states. [2018-01-21 06:00:20,893 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 611 to 333. [2018-01-21 06:00:20,893 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 333 states. [2018-01-21 06:00:20,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 333 states to 333 states and 380 transitions. [2018-01-21 06:00:20,896 INFO L78 Accepts]: Start accepts. Automaton has 333 states and 380 transitions. Word has length 333 [2018-01-21 06:00:20,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:20,897 INFO L432 AbstractCegarLoop]: Abstraction has 333 states and 380 transitions. [2018-01-21 06:00:20,897 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 06:00:20,897 INFO L276 IsEmpty]: Start isEmpty. Operand 333 states and 380 transitions. [2018-01-21 06:00:20,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 397 [2018-01-21 06:00:20,901 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:20,902 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 06:00:20,902 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:20,902 INFO L82 PathProgramCache]: Analyzing trace with hash -626287868, now seen corresponding path program 10 times [2018-01-21 06:00:20,902 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:20,903 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:20,903 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:20,903 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:20,903 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:20,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:20,971 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:21,304 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 06:00:21,304 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:21,304 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:21,304 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:21,305 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:21,305 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:21,305 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:21,310 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:21,311 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:21,386 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:21,393 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:21,628 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 06:00:21,628 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:21,989 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 06:00:22,009 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:22,009 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:22,012 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:00:22,012 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:00:22,144 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:22,156 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:22,227 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 06:00:22,227 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:22,487 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 06:00:22,488 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:22,489 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19, 19, 19, 19] total 38 [2018-01-21 06:00:22,489 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:22,490 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 06:00:22,490 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 06:00:22,490 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=1149, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:00:22,491 INFO L87 Difference]: Start difference. First operand 333 states and 380 transitions. Second operand 30 states. [2018-01-21 06:00:23,382 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:23,383 INFO L93 Difference]: Finished difference Result 877 states and 999 transitions. [2018-01-21 06:00:23,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 06:00:23,421 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 396 [2018-01-21 06:00:23,422 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:23,426 INFO L225 Difference]: With dead ends: 877 [2018-01-21 06:00:23,426 INFO L226 Difference]: Without dead ends: 721 [2018-01-21 06:00:23,428 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1613 GetRequests, 1539 SyntacticMatches, 20 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=549, Invalid=2531, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 06:00:23,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 721 states. [2018-01-21 06:00:23,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 721 to 391. [2018-01-21 06:00:23,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 391 states. [2018-01-21 06:00:23,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 444 transitions. [2018-01-21 06:00:23,461 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 444 transitions. Word has length 396 [2018-01-21 06:00:23,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:23,462 INFO L432 AbstractCegarLoop]: Abstraction has 391 states and 444 transitions. [2018-01-21 06:00:23,462 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 06:00:23,462 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 444 transitions. [2018-01-21 06:00:23,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 460 [2018-01-21 06:00:23,466 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:23,466 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 06:00:23,466 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:23,467 INFO L82 PathProgramCache]: Analyzing trace with hash 91735614, now seen corresponding path program 11 times [2018-01-21 06:00:23,467 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:23,468 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:23,468 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:23,468 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:23,468 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:23,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:23,516 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:24,346 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 06:00:24,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:24,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:24,346 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:24,346 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:24,346 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:24,346 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:24,352 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:24,352 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:24,377 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,395 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,413 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,430 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,447 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,464 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,481 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,498 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:24,510 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:24,515 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:25,172 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 06:00:25,172 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:25,728 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 06:00:25,750 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:25,750 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:25,753 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:00:25,753 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:00:25,788 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:25,799 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:25,821 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:25,861 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:25,948 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:27,508 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:32,246 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:32,579 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:00:32,627 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:32,637 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:32,733 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 06:00:32,733 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:33,072 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 06:00:33,075 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:00:33,076 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 19, 19, 19, 19] total 40 [2018-01-21 06:00:33,076 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:00:33,076 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 06:00:33,076 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 06:00:33,077 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=1318, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:00:33,077 INFO L87 Difference]: Start difference. First operand 391 states and 444 transitions. Second operand 31 states. [2018-01-21 06:00:35,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:00:35,019 INFO L93 Difference]: Finished difference Result 966 states and 1091 transitions. [2018-01-21 06:00:35,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 06:00:35,019 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 459 [2018-01-21 06:00:35,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:00:35,023 INFO L225 Difference]: With dead ends: 966 [2018-01-21 06:00:35,023 INFO L226 Difference]: Without dead ends: 554 [2018-01-21 06:00:35,026 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1888 GetRequests, 1801 SyntacticMatches, 20 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1351 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=764, Invalid=3928, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 06:00:35,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 554 states. [2018-01-21 06:00:35,051 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 554 to 395. [2018-01-21 06:00:35,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 395 states. [2018-01-21 06:00:35,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 395 states to 395 states and 440 transitions. [2018-01-21 06:00:35,053 INFO L78 Accepts]: Start accepts. Automaton has 395 states and 440 transitions. Word has length 459 [2018-01-21 06:00:35,053 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:00:35,054 INFO L432 AbstractCegarLoop]: Abstraction has 395 states and 440 transitions. [2018-01-21 06:00:35,054 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 06:00:35,054 INFO L276 IsEmpty]: Start isEmpty. Operand 395 states and 440 transitions. [2018-01-21 06:00:35,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 518 [2018-01-21 06:00:35,058 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:00:35,058 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 06:00:35,058 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:00:35,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1309279644, now seen corresponding path program 12 times [2018-01-21 06:00:35,059 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:00:35,059 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:35,059 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:00:35,059 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:00:35,060 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:00:35,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:00:35,111 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:00:35,670 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 06:00:35,670 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:35,670 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:00:35,670 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:00:35,670 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:00:35,670 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:35,671 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:00:35,676 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:35,676 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:35,706 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,711 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,715 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,720 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,733 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,742 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,752 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,769 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,785 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,797 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,846 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,882 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,936 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:35,966 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:36,018 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:36,021 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:00:36,028 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:00:36,262 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 06:00:36,262 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:00:36,805 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 06:00:36,828 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:00:36,828 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:00:36,832 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:00:36,832 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:00:36,869 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:36,883 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:36,911 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:36,956 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:43,754 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:00:55,789 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