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_mostprecise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/memset3_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 03:18:07,015 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 03:18:07,017 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 03:18:07,031 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 03:18:07,032 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 03:18:07,033 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 03:18:07,034 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 03:18:07,037 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 03:18:07,039 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 03:18:07,040 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 03:18:07,041 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 03:18:07,041 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 03:18:07,042 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 03:18:07,044 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 03:18:07,045 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 03:18:07,047 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 03:18:07,050 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 03:18:07,052 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 03:18:07,053 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 03:18:07,054 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 03:18:07,057 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 03:18:07,057 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 03:18:07,058 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 03:18:07,059 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 03:18:07,060 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 03:18:07,061 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 03:18:07,061 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 03:18:07,062 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 03:18:07,062 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 03:18:07,063 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 03:18:07,063 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 03:18:07,064 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_mostprecise.epf [2018-01-21 03:18:07,075 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 03:18:07,076 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 03:18:07,077 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 03:18:07,077 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 03:18:07,077 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 03:18:07,077 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 03:18:07,078 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 03:18:07,078 INFO L133 SettingsManager]: * Precise comparison operator=true [2018-01-21 03:18:07,078 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 03:18:07,079 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 03:18:07,079 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 03:18:07,079 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 03:18:07,079 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 03:18:07,080 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 03:18:07,080 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 03:18:07,080 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 03:18:07,080 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 03:18:07,081 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 03:18:07,081 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 03:18:07,081 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 03:18:07,081 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 03:18:07,081 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 03:18:07,082 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 03:18:07,082 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 03:18:07,082 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 03:18:07,082 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 03:18:07,082 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 03:18:07,083 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 03:18:07,083 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 03:18:07,083 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 03:18:07,083 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 03:18:07,083 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 03:18:07,084 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 03:18:07,084 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 03:18:07,084 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 03:18:07,084 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 03:18:07,084 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 03:18:07,085 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 03:18:07,086 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 03:18:07,086 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 03:18:07,133 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 03:18:07,148 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 03:18:07,155 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 03:18:07,157 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 03:18:07,158 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 03:18:07,159 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/memset3_false-valid-deref-write.c [2018-01-21 03:18:07,310 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 03:18:07,318 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 03:18:07,320 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 03:18:07,320 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 03:18:07,328 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 03:18:07,329 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,333 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@59def0bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07, skipping insertion in model container [2018-01-21 03:18:07,333 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,353 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:18:07,378 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 03:18:07,506 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:18:07,525 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 03:18:07,530 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07 WrapperNode [2018-01-21 03:18:07,530 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 03:18:07,531 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 03:18:07,531 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 03:18:07,531 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 03:18:07,543 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,543 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,551 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,551 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,554 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,558 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,559 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (1/1) ... [2018-01-21 03:18:07,560 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 03:18:07,561 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 03:18:07,561 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 03:18:07,561 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 03:18:07,562 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (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 03:18:07,621 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 03:18:07,622 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 03:18:07,622 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 03:18:07,622 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 03:18:07,622 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 03:18:07,622 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 03:18:07,622 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.C_memset [2018-01-21 03:18:07,623 INFO L136 BoogieDeclarations]: Found implementation of procedure #Ultimate.C_memset [2018-01-21 03:18:07,623 INFO L128 BoogieDeclarations]: Found specification of procedure memset [2018-01-21 03:18:07,623 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 03:18:07,623 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 03:18:07,623 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 03:18:07,777 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 03:18:07,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:18:07 BoogieIcfgContainer [2018-01-21 03:18:07,777 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 03:18:07,778 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 03:18:07,778 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 03:18:07,780 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 03:18:07,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 03:18:07" (1/3) ... [2018-01-21 03:18:07,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6996a73b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:18:07, skipping insertion in model container [2018-01-21 03:18:07,781 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 03:18:07" (2/3) ... [2018-01-21 03:18:07,782 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6996a73b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 03:18:07, skipping insertion in model container [2018-01-21 03:18:07,782 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 03:18:07" (3/3) ... [2018-01-21 03:18:07,784 INFO L105 eAbstractionObserver]: Analyzing ICFG memset3_false-valid-deref-write.c [2018-01-21 03:18:07,794 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 03:18:07,805 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 3 error locations. [2018-01-21 03:18:07,851 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:18:07,851 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:18:07,851 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:18:07,851 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:18:07,851 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:18:07,852 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:18:07,852 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:18:07,852 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 03:18:07,853 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:18:07,875 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 03:18:07,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 03:18:07,882 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:07,884 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 03:18:07,884 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 03:18:07,890 INFO L82 PathProgramCache]: Analyzing trace with hash 51896, now seen corresponding path program 1 times [2018-01-21 03:18:07,892 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:07,970 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:07,970 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:07,970 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:07,970 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:08,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:18:08,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 03:18:08,041 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 03:18:08,049 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 03:18:08,057 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:18:08,057 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:18:08,057 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:18:08,057 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:18:08,057 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:18:08,058 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:18:08,058 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:18:08,058 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 03:18:08,058 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:18:08,059 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 03:18:08,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2018-01-21 03:18:08,060 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:08,061 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:08,061 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:08,061 INFO L82 PathProgramCache]: Analyzing trace with hash 126067280, now seen corresponding path program 1 times [2018-01-21 03:18:08,061 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:08,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:08,064 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:08,064 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:08,065 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:08,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:08,103 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:08,219 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 03:18:08,221 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 03:18:08,221 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-01-21 03:18:08,221 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 03:18:08,223 INFO L409 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-01-21 03:18:08,239 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-01-21 03:18:08,240 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2018-01-21 03:18:08,242 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 4 states. [2018-01-21 03:18:08,309 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:08,309 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 03:18:08,310 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-01-21 03:18:08,311 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2018-01-21 03:18:08,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:08,322 INFO L225 Difference]: With dead ends: 34 [2018-01-21 03:18:08,322 INFO L226 Difference]: Without dead ends: 20 [2018-01-21 03:18:08,325 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2018-01-21 03:18:08,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-01-21 03:18:08,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-01-21 03:18:08,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-01-21 03:18:08,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-01-21 03:18:08,439 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 18 [2018-01-21 03:18:08,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:08,439 INFO L432 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-01-21 03:18:08,439 INFO L433 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-01-21 03:18:08,440 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-01-21 03:18:08,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 03:18:08,440 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:08,441 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 03:18:08,441 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:08,441 INFO L82 PathProgramCache]: Analyzing trace with hash 763300235, now seen corresponding path program 1 times [2018-01-21 03:18:08,441 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:08,442 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:08,443 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:08,443 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:08,443 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:08,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:08,459 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:08,558 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:08,559 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:08,559 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:08,560 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 20 with the following transitions: [2018-01-21 03:18:08,562 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [9], [10], [14], [15], [16], [18], [19], [20], [21], [23], [24], [25], [26], [27], [28] [2018-01-21 03:18:08,624 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 03:18:08,625 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 03:18:09,671 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 03:18:09,673 INFO L268 AbstractInterpreter]: Visited 19 different actions 23 times. Merged at 3 different actions 3 times. Never widened. Found 2 fixpoints after 2 different actions. Largest state had 15 variables. [2018-01-21 03:18:09,690 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 03:18:09,690 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:09,690 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 03:18:09,708 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:09,708 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:09,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:09,740 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:09,782 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:09,782 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:09,918 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:09,942 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:09,942 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:09,946 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:09,947 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:09,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:09,974 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:09,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:09,980 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:10,093 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,095 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:10,095 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 03:18:10,095 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:10,096 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 03:18:10,097 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 03:18:10,097 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-01-21 03:18:10,097 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 6 states. [2018-01-21 03:18:10,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:10,186 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2018-01-21 03:18:10,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 03:18:10,186 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-01-21 03:18:10,187 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:10,188 INFO L225 Difference]: With dead ends: 30 [2018-01-21 03:18:10,188 INFO L226 Difference]: Without dead ends: 21 [2018-01-21 03:18:10,189 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 70 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-01-21 03:18:10,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-01-21 03:18:10,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2018-01-21 03:18:10,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-01-21 03:18:10,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2018-01-21 03:18:10,193 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 19 [2018-01-21 03:18:10,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:10,193 INFO L432 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2018-01-21 03:18:10,194 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 03:18:10,194 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2018-01-21 03:18:10,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-01-21 03:18:10,194 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:10,195 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:10,195 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:10,195 INFO L82 PathProgramCache]: Analyzing trace with hash -957314640, now seen corresponding path program 2 times [2018-01-21 03:18:10,195 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:10,196 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:10,196 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:10,196 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:10,196 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:10,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:10,209 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:10,277 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,277 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,278 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:10,278 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:10,278 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:10,278 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,278 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:10,284 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:10,285 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:10,299 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:10,306 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:10,307 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:10,309 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:10,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,337 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:10,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,457 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,457 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 5 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 5 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:10,460 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:10,461 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:10,479 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:10,491 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:10,497 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:10,500 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:10,503 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,503 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:10,607 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,609 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:10,609 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 03:18:10,609 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:10,609 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 03:18:10,610 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 03:18:10,610 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2018-01-21 03:18:10,610 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 7 states. [2018-01-21 03:18:10,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:10,641 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-01-21 03:18:10,642 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 03:18:10,642 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-01-21 03:18:10,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:10,643 INFO L225 Difference]: With dead ends: 31 [2018-01-21 03:18:10,643 INFO L226 Difference]: Without dead ends: 22 [2018-01-21 03:18:10,643 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 73 SyntacticMatches, 2 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=55, Invalid=77, Unknown=0, NotChecked=0, Total=132 [2018-01-21 03:18:10,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-01-21 03:18:10,646 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-01-21 03:18:10,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-01-21 03:18:10,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-01-21 03:18:10,647 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 20 [2018-01-21 03:18:10,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:10,648 INFO L432 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-01-21 03:18:10,648 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 03:18:10,648 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-01-21 03:18:10,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-01-21 03:18:10,649 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:10,649 INFO L322 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:10,649 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:10,649 INFO L82 PathProgramCache]: Analyzing trace with hash 1538199083, now seen corresponding path program 3 times [2018-01-21 03:18:10,649 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:10,650 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:10,651 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:10,651 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:10,651 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:10,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:10,664 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:10,718 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,718 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,718 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:10,718 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:10,718 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:10,718 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,719 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:10,728 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:10,728 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:10,739 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,744 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,748 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,754 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:10,756 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:10,769 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,769 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:10,901 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:10,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 7 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 7 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:10,925 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:10,925 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:10,940 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,947 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,955 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:10,961 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:10,964 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:10,968 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:10,969 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:11,033 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,035 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:11,035 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 13 [2018-01-21 03:18:11,035 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:11,035 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 03:18:11,036 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 03:18:11,036 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2018-01-21 03:18:11,036 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-01-21 03:18:11,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:11,073 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2018-01-21 03:18:11,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-01-21 03:18:11,073 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-01-21 03:18:11,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:11,074 INFO L225 Difference]: With dead ends: 32 [2018-01-21 03:18:11,075 INFO L226 Difference]: Without dead ends: 23 [2018-01-21 03:18:11,075 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 90 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=77, Invalid=105, Unknown=0, NotChecked=0, Total=182 [2018-01-21 03:18:11,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-01-21 03:18:11,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2018-01-21 03:18:11,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2018-01-21 03:18:11,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2018-01-21 03:18:11,079 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 21 [2018-01-21 03:18:11,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:11,079 INFO L432 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2018-01-21 03:18:11,080 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 03:18:11,080 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2018-01-21 03:18:11,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2018-01-21 03:18:11,080 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:11,080 INFO L322 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:11,080 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:11,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1589713168, now seen corresponding path program 4 times [2018-01-21 03:18:11,081 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:11,081 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,081 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:11,082 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,082 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:11,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:11,091 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:11,152 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,152 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,152 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:11,153 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:11,153 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:11,153 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,153 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:11,162 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:11,163 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:11,173 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:11,175 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:11,188 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,188 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:11,293 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,313 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,314 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 9 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 9 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:11,316 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:11,317 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:11,339 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:11,342 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:11,346 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,346 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:11,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,414 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:11,414 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 15 [2018-01-21 03:18:11,414 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:11,415 INFO L409 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-01-21 03:18:11,415 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-01-21 03:18:11,415 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2018-01-21 03:18:11,415 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2018-01-21 03:18:11,451 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:11,451 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-01-21 03:18:11,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 03:18:11,452 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2018-01-21 03:18:11,452 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:11,453 INFO L225 Difference]: With dead ends: 33 [2018-01-21 03:18:11,453 INFO L226 Difference]: Without dead ends: 24 [2018-01-21 03:18:11,454 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=103, Invalid=137, Unknown=0, NotChecked=0, Total=240 [2018-01-21 03:18:11,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-01-21 03:18:11,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-01-21 03:18:11,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-01-21 03:18:11,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-01-21 03:18:11,458 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 22 [2018-01-21 03:18:11,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:11,458 INFO L432 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-01-21 03:18:11,458 INFO L433 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-01-21 03:18:11,458 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-01-21 03:18:11,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-01-21 03:18:11,459 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:11,459 INFO L322 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:11,459 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:11,459 INFO L82 PathProgramCache]: Analyzing trace with hash -1108317493, now seen corresponding path program 5 times [2018-01-21 03:18:11,460 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:11,460 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,460 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:11,461 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,461 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:11,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:11,473 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:11,586 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,586 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,586 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:11,586 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:11,586 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:11,586 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,586 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:11,595 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:11,595 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:11,601 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,606 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,609 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,618 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,620 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:11,622 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:11,641 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,642 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:11,777 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,797 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:11,798 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 11 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 11 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:11,801 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:11,801 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:11,805 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,807 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,812 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:11,829 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:11,832 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:11,837 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,837 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:11,897 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:11,899 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:11,899 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 03:18:11,899 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:11,900 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 03:18:11,900 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 03:18:11,900 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2018-01-21 03:18:11,900 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 10 states. [2018-01-21 03:18:11,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:11,929 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2018-01-21 03:18:11,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 03:18:11,929 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 23 [2018-01-21 03:18:11,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:11,930 INFO L225 Difference]: With dead ends: 34 [2018-01-21 03:18:11,930 INFO L226 Difference]: Without dead ends: 25 [2018-01-21 03:18:11,931 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 82 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=133, Invalid=173, Unknown=0, NotChecked=0, Total=306 [2018-01-21 03:18:11,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-01-21 03:18:11,934 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-01-21 03:18:11,934 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-01-21 03:18:11,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2018-01-21 03:18:11,935 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 23 [2018-01-21 03:18:11,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:11,936 INFO L432 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2018-01-21 03:18:11,936 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 03:18:11,936 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2018-01-21 03:18:11,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2018-01-21 03:18:11,936 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:11,937 INFO L322 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:11,937 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:11,937 INFO L82 PathProgramCache]: Analyzing trace with hash 1152077936, now seen corresponding path program 6 times [2018-01-21 03:18:11,937 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:11,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,938 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:11,938 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:11,938 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:11,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:11,949 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:12,065 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,065 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,066 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:12,066 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:12,066 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:12,066 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,066 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:12,073 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:12,073 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:12,083 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,086 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,088 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,089 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:12,091 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:12,100 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,100 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:12,251 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,272 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,272 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 13 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 13 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:12,275 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:12,275 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:12,290 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,301 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,314 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,327 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:12,337 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:12,341 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:12,347 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,347 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:12,429 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,430 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:12,431 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 03:18:12,431 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:12,431 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 03:18:12,431 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 03:18:12,432 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2018-01-21 03:18:12,432 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 11 states. [2018-01-21 03:18:12,481 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:12,482 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-01-21 03:18:12,482 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 03:18:12,482 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 24 [2018-01-21 03:18:12,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:12,483 INFO L225 Difference]: With dead ends: 35 [2018-01-21 03:18:12,483 INFO L226 Difference]: Without dead ends: 26 [2018-01-21 03:18:12,483 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 85 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=167, Invalid=213, Unknown=0, NotChecked=0, Total=380 [2018-01-21 03:18:12,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-01-21 03:18:12,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-01-21 03:18:12,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-01-21 03:18:12,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-01-21 03:18:12,487 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 24 [2018-01-21 03:18:12,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:12,488 INFO L432 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-01-21 03:18:12,488 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 03:18:12,488 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-01-21 03:18:12,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-01-21 03:18:12,489 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:12,489 INFO L322 BasicCegarLoop]: trace histogram [7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:12,489 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:12,489 INFO L82 PathProgramCache]: Analyzing trace with hash -1790107797, now seen corresponding path program 7 times [2018-01-21 03:18:12,489 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:12,490 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:12,490 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:12,491 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:12,491 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:12,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:12,502 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:12,651 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,651 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,651 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:12,652 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:12,652 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:12,652 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,652 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:12,657 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:12,657 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:12,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:12,669 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:12,686 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,687 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:12,894 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,914 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:12,914 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 15 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 15 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:12,917 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:12,918 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:12,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:12,938 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:12,942 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:12,942 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:13,001 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,003 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:13,003 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 21 [2018-01-21 03:18:13,003 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:13,003 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 03:18:13,004 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 03:18:13,004 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2018-01-21 03:18:13,004 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 12 states. [2018-01-21 03:18:13,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:13,026 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-01-21 03:18:13,026 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-01-21 03:18:13,026 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 25 [2018-01-21 03:18:13,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:13,027 INFO L225 Difference]: With dead ends: 36 [2018-01-21 03:18:13,027 INFO L226 Difference]: Without dead ends: 27 [2018-01-21 03:18:13,028 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 88 SyntacticMatches, 2 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=205, Invalid=257, Unknown=0, NotChecked=0, Total=462 [2018-01-21 03:18:13,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-01-21 03:18:13,030 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2018-01-21 03:18:13,030 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-01-21 03:18:13,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-01-21 03:18:13,030 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 25 [2018-01-21 03:18:13,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:13,031 INFO L432 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-01-21 03:18:13,031 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 03:18:13,031 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-01-21 03:18:13,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-01-21 03:18:13,031 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:13,031 INFO L322 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:13,031 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:13,032 INFO L82 PathProgramCache]: Analyzing trace with hash 1491414992, now seen corresponding path program 8 times [2018-01-21 03:18:13,032 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:13,032 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:13,032 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:13,032 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:13,033 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:13,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:13,041 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:13,105 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,105 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,105 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:13,105 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:13,105 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:13,105 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,106 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:13,110 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:13,111 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:13,117 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:13,120 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:13,121 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:13,122 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:13,130 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,130 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:13,353 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,374 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,375 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 17 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 17 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:13,379 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:13,379 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:13,390 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:13,400 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:13,407 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:13,410 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:13,415 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,415 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:13,494 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,496 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:13,496 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 23 [2018-01-21 03:18:13,496 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:13,496 INFO L409 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-01-21 03:18:13,497 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-01-21 03:18:13,497 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2018-01-21 03:18:13,497 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 13 states. [2018-01-21 03:18:13,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:13,539 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-01-21 03:18:13,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 03:18:13,539 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 26 [2018-01-21 03:18:13,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:13,540 INFO L225 Difference]: With dead ends: 37 [2018-01-21 03:18:13,540 INFO L226 Difference]: Without dead ends: 28 [2018-01-21 03:18:13,541 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=247, Invalid=305, Unknown=0, NotChecked=0, Total=552 [2018-01-21 03:18:13,541 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-01-21 03:18:13,544 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-01-21 03:18:13,544 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-01-21 03:18:13,545 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-01-21 03:18:13,545 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 26 [2018-01-21 03:18:13,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:13,545 INFO L432 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-01-21 03:18:13,545 INFO L433 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-01-21 03:18:13,545 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-01-21 03:18:13,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-01-21 03:18:13,546 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:13,546 INFO L322 BasicCegarLoop]: trace histogram [9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:13,546 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:13,547 INFO L82 PathProgramCache]: Analyzing trace with hash 139406347, now seen corresponding path program 9 times [2018-01-21 03:18:13,547 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:13,547 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:13,548 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:13,548 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:13,548 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:13,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:13,558 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:13,633 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,634 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,634 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:13,634 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:13,634 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:13,634 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,634 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:13,639 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:13,639 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:13,647 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,649 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,651 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,652 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,654 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,656 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,656 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:13,657 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:13,672 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,672 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:13,948 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:13,969 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:13,969 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 19 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 19 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:13,972 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:13,972 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:13,981 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,988 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:13,996 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:14,005 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:14,014 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:14,023 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:14,030 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:14,033 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:14,037 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,037 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:14,101 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,102 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:14,102 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 25 [2018-01-21 03:18:14,102 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:14,103 INFO L409 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-01-21 03:18:14,103 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-01-21 03:18:14,103 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2018-01-21 03:18:14,103 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 14 states. [2018-01-21 03:18:14,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:14,125 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2018-01-21 03:18:14,125 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 03:18:14,125 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 27 [2018-01-21 03:18:14,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:14,126 INFO L225 Difference]: With dead ends: 38 [2018-01-21 03:18:14,126 INFO L226 Difference]: Without dead ends: 29 [2018-01-21 03:18:14,127 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 94 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=293, Invalid=357, Unknown=0, NotChecked=0, Total=650 [2018-01-21 03:18:14,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-01-21 03:18:14,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2018-01-21 03:18:14,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-01-21 03:18:14,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2018-01-21 03:18:14,130 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 27 [2018-01-21 03:18:14,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:14,131 INFO L432 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2018-01-21 03:18:14,131 INFO L433 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-01-21 03:18:14,131 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2018-01-21 03:18:14,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2018-01-21 03:18:14,131 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:14,132 INFO L322 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:14,132 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:14,132 INFO L82 PathProgramCache]: Analyzing trace with hash 1176811312, now seen corresponding path program 10 times [2018-01-21 03:18:14,132 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:14,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:14,133 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:14,133 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:14,133 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:14,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:14,141 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:14,235 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:14,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:14,236 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:14,236 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:14,236 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:14,236 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:14,241 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:14,241 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:14,252 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:14,253 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:14,265 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,266 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:14,532 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,552 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:14,552 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 21 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 21 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:14,555 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:14,555 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:14,581 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:14,584 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:14,589 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,589 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:14,663 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,665 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:14,665 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 27 [2018-01-21 03:18:14,665 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:14,665 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 03:18:14,666 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 03:18:14,666 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2018-01-21 03:18:14,666 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2018-01-21 03:18:14,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:14,695 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-01-21 03:18:14,695 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 03:18:14,695 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2018-01-21 03:18:14,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:14,696 INFO L225 Difference]: With dead ends: 39 [2018-01-21 03:18:14,696 INFO L226 Difference]: Without dead ends: 30 [2018-01-21 03:18:14,696 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 125 GetRequests, 97 SyntacticMatches, 2 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=343, Invalid=413, Unknown=0, NotChecked=0, Total=756 [2018-01-21 03:18:14,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-01-21 03:18:14,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-01-21 03:18:14,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-01-21 03:18:14,700 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-01-21 03:18:14,700 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 28 [2018-01-21 03:18:14,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:14,700 INFO L432 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-01-21 03:18:14,700 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 03:18:14,700 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-01-21 03:18:14,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-01-21 03:18:14,701 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:14,701 INFO L322 BasicCegarLoop]: trace histogram [11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:14,701 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:14,701 INFO L82 PathProgramCache]: Analyzing trace with hash -1023373141, now seen corresponding path program 11 times [2018-01-21 03:18:14,701 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:14,702 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:14,702 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:14,702 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:14,702 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:14,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:14,710 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:14,799 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,799 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:14,800 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:14,800 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:14,800 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:14,800 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:14,800 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:14,808 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:14,809 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:14,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,818 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,819 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,820 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,821 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,822 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,827 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:14,828 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:14,830 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:14,855 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:14,855 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:15,129 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,149 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:15,149 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 23 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 23 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:15,152 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:15,152 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:15,156 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,157 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,161 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,165 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,172 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,179 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,195 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:15,209 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:15,213 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,222 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:15,372 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,373 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:15,373 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 29 [2018-01-21 03:18:15,373 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:15,374 INFO L409 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-01-21 03:18:15,374 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-01-21 03:18:15,374 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2018-01-21 03:18:15,375 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 16 states. [2018-01-21 03:18:15,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:15,397 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2018-01-21 03:18:15,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-01-21 03:18:15,398 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 29 [2018-01-21 03:18:15,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:15,399 INFO L225 Difference]: With dead ends: 40 [2018-01-21 03:18:15,399 INFO L226 Difference]: Without dead ends: 31 [2018-01-21 03:18:15,399 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 100 SyntacticMatches, 2 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=397, Invalid=473, Unknown=0, NotChecked=0, Total=870 [2018-01-21 03:18:15,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-01-21 03:18:15,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2018-01-21 03:18:15,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2018-01-21 03:18:15,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2018-01-21 03:18:15,403 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 29 [2018-01-21 03:18:15,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:15,403 INFO L432 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2018-01-21 03:18:15,403 INFO L433 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-01-21 03:18:15,403 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2018-01-21 03:18:15,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2018-01-21 03:18:15,404 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:15,404 INFO L322 BasicCegarLoop]: trace histogram [12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:15,404 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:15,405 INFO L82 PathProgramCache]: Analyzing trace with hash -509614448, now seen corresponding path program 12 times [2018-01-21 03:18:15,405 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:15,405 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:15,406 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:15,406 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:15,406 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:15,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:15,414 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:15,511 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:15,511 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:15,511 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:15,511 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:15,511 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:15,511 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:15,517 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:15,517 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:15,526 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,536 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,538 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,543 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,545 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,546 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,547 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,547 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:15,549 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:15,558 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,558 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:15,932 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:15,953 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:15,953 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 25 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 25 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:15,956 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:15,956 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:15,966 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,973 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,981 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,990 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:15,999 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:16,008 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:16,018 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:16,025 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:16,029 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:16,035 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,036 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:16,152 INFO L134 CoverageAnalysis]: Checked inductivity of 78 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,153 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:16,153 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 31 [2018-01-21 03:18:16,153 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:16,154 INFO L409 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-01-21 03:18:16,154 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-01-21 03:18:16,154 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2018-01-21 03:18:16,154 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 17 states. [2018-01-21 03:18:16,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:16,181 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-01-21 03:18:16,181 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-01-21 03:18:16,181 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 30 [2018-01-21 03:18:16,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:16,182 INFO L225 Difference]: With dead ends: 41 [2018-01-21 03:18:16,182 INFO L226 Difference]: Without dead ends: 32 [2018-01-21 03:18:16,182 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 103 SyntacticMatches, 2 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=455, Invalid=537, Unknown=0, NotChecked=0, Total=992 [2018-01-21 03:18:16,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-01-21 03:18:16,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-01-21 03:18:16,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-01-21 03:18:16,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-01-21 03:18:16,185 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 30 [2018-01-21 03:18:16,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:16,185 INFO L432 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-01-21 03:18:16,185 INFO L433 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-01-21 03:18:16,185 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-01-21 03:18:16,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 03:18:16,186 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:16,186 INFO L322 BasicCegarLoop]: trace histogram [13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:16,186 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:16,186 INFO L82 PathProgramCache]: Analyzing trace with hash -1762964149, now seen corresponding path program 13 times [2018-01-21 03:18:16,186 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:16,187 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:16,187 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:16,187 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:16,187 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:16,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:16,194 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:16,325 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,325 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:16,325 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:16,325 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:16,325 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:16,325 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:16,326 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:16,336 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:16,337 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:16,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:16,350 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:16,359 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,359 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:16,768 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,787 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:16,788 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 27 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 27 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:16,791 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:16,791 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:16,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:16,823 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:16,828 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,828 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:16,965 INFO L134 CoverageAnalysis]: Checked inductivity of 91 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:16,967 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:16,968 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 33 [2018-01-21 03:18:16,968 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:16,968 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 03:18:16,968 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 03:18:16,969 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 03:18:16,969 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 18 states. [2018-01-21 03:18:17,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:17,023 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-01-21 03:18:17,023 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 03:18:17,023 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 31 [2018-01-21 03:18:17,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:17,024 INFO L225 Difference]: With dead ends: 42 [2018-01-21 03:18:17,024 INFO L226 Difference]: Without dead ends: 33 [2018-01-21 03:18:17,025 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 106 SyntacticMatches, 2 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=517, Invalid=605, Unknown=0, NotChecked=0, Total=1122 [2018-01-21 03:18:17,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-01-21 03:18:17,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-01-21 03:18:17,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-01-21 03:18:17,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-01-21 03:18:17,028 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 31 [2018-01-21 03:18:17,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:17,028 INFO L432 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-01-21 03:18:17,028 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 03:18:17,028 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-01-21 03:18:17,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-01-21 03:18:17,028 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:17,029 INFO L322 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:17,029 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:17,029 INFO L82 PathProgramCache]: Analyzing trace with hash -1962099216, now seen corresponding path program 14 times [2018-01-21 03:18:17,029 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:17,029 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:17,029 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:17,030 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:17,030 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:17,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:17,037 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:17,189 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:17,189 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:17,189 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:17,189 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:17,189 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:17,189 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:17,190 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:17,194 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:17,195 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:17,201 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:17,204 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:17,205 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:17,206 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:17,214 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:17,214 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:17,611 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:17,632 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:17,632 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 29 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 29 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:17,636 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:17,636 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:17,647 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:17,658 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:17,667 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:17,671 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:17,677 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:17,678 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:17,838 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:17,840 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:17,840 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 35 [2018-01-21 03:18:17,840 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:17,840 INFO L409 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-01-21 03:18:17,841 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-01-21 03:18:17,841 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2018-01-21 03:18:17,841 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 19 states. [2018-01-21 03:18:17,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:17,941 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-01-21 03:18:17,942 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 03:18:17,942 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 32 [2018-01-21 03:18:17,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:17,943 INFO L225 Difference]: With dead ends: 43 [2018-01-21 03:18:17,943 INFO L226 Difference]: Without dead ends: 34 [2018-01-21 03:18:17,944 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=583, Invalid=677, Unknown=0, NotChecked=0, Total=1260 [2018-01-21 03:18:17,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-01-21 03:18:17,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-01-21 03:18:17,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-01-21 03:18:17,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-01-21 03:18:17,950 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 32 [2018-01-21 03:18:17,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:17,950 INFO L432 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-01-21 03:18:17,950 INFO L433 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-01-21 03:18:17,950 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-01-21 03:18:17,951 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-01-21 03:18:17,951 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:17,951 INFO L322 BasicCegarLoop]: trace histogram [15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:17,951 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:17,951 INFO L82 PathProgramCache]: Analyzing trace with hash 454648299, now seen corresponding path program 15 times [2018-01-21 03:18:17,951 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:17,952 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:17,952 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:17,952 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:17,953 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:17,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:17,961 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:18,350 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:18,351 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:18,351 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:18,351 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:18,351 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:18,351 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:18,351 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:18,361 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:18,362 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:18,372 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,375 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,380 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,381 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,383 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,385 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,386 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,388 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,389 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:18,390 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:18,392 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:18,405 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:18,405 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:19,374 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:19,407 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:19,407 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 31 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 31 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:19,410 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:19,410 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:19,421 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,428 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,436 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,445 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,455 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,475 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,485 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,496 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:19,504 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:19,507 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:19,512 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:19,512 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:19,681 INFO L134 CoverageAnalysis]: Checked inductivity of 120 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:19,682 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:19,682 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 37 [2018-01-21 03:18:19,682 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:19,683 INFO L409 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-01-21 03:18:19,683 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-01-21 03:18:19,683 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 03:18:19,683 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 20 states. [2018-01-21 03:18:19,710 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:19,710 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2018-01-21 03:18:19,711 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-01-21 03:18:19,711 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 33 [2018-01-21 03:18:19,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:19,712 INFO L225 Difference]: With dead ends: 44 [2018-01-21 03:18:19,712 INFO L226 Difference]: Without dead ends: 35 [2018-01-21 03:18:19,712 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 112 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 93 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=653, Invalid=753, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 03:18:19,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-01-21 03:18:19,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2018-01-21 03:18:19,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2018-01-21 03:18:19,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2018-01-21 03:18:19,716 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 33 [2018-01-21 03:18:19,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:19,717 INFO L432 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2018-01-21 03:18:19,717 INFO L433 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-01-21 03:18:19,717 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2018-01-21 03:18:19,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2018-01-21 03:18:19,718 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:19,718 INFO L322 BasicCegarLoop]: trace histogram [16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:19,718 INFO L371 AbstractCegarLoop]: === Iteration 17 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:19,718 INFO L82 PathProgramCache]: Analyzing trace with hash -1935590064, now seen corresponding path program 16 times [2018-01-21 03:18:19,718 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:19,719 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:19,719 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:19,719 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:19,719 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:19,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:19,729 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:19,957 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:19,957 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:19,957 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:19,957 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:19,957 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:19,957 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:19,957 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:19,968 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:19,968 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:19,986 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:19,987 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:19,997 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:19,997 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:20,846 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:20,866 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:20,866 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 33 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 33 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:20,869 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:20,869 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:20,910 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:20,915 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:20,927 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:20,927 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:21,056 WARN L143 SmtUtils]: Spent 127ms on a formula simplification that was a NOOP. DAG size: 56 [2018-01-21 03:18:21,192 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:21,194 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:21,194 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 39 [2018-01-21 03:18:21,194 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:21,195 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 03:18:21,195 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 03:18:21,195 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2018-01-21 03:18:21,195 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 21 states. [2018-01-21 03:18:21,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:21,275 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-01-21 03:18:21,278 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-01-21 03:18:21,278 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 34 [2018-01-21 03:18:21,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:21,279 INFO L225 Difference]: With dead ends: 45 [2018-01-21 03:18:21,279 INFO L226 Difference]: Without dead ends: 36 [2018-01-21 03:18:21,280 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=727, Invalid=833, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 03:18:21,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-01-21 03:18:21,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-01-21 03:18:21,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-01-21 03:18:21,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-01-21 03:18:21,283 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 34 [2018-01-21 03:18:21,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:21,284 INFO L432 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-01-21 03:18:21,284 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 03:18:21,284 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-01-21 03:18:21,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-01-21 03:18:21,285 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:21,285 INFO L322 BasicCegarLoop]: trace histogram [17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:21,285 INFO L371 AbstractCegarLoop]: === Iteration 18 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:21,285 INFO L82 PathProgramCache]: Analyzing trace with hash 1276432011, now seen corresponding path program 17 times [2018-01-21 03:18:21,285 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:21,286 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:21,286 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:21,286 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:21,286 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:21,297 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:21,484 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:21,484 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:21,485 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:21,485 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:21,485 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:21,485 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:21,485 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:21,493 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:21,493 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:21,497 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,498 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,499 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,500 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,501 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,501 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,502 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,503 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,504 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,509 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:21,511 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:21,512 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:21,542 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:21,542 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:22,197 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:22,217 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:22,217 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 35 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 35 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:22,221 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:22,221 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:22,226 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,227 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,231 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,235 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,242 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,250 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,258 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,267 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,277 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,296 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:22,312 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:22,316 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:22,326 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:22,326 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:22,521 INFO L134 CoverageAnalysis]: Checked inductivity of 153 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:22,522 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:22,522 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 41 [2018-01-21 03:18:22,522 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:22,523 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 03:18:22,523 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 03:18:22,523 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 03:18:22,523 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 22 states. [2018-01-21 03:18:22,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:22,585 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2018-01-21 03:18:22,585 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 03:18:22,585 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 35 [2018-01-21 03:18:22,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:22,586 INFO L225 Difference]: With dead ends: 46 [2018-01-21 03:18:22,586 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 03:18:22,587 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 118 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=805, Invalid=917, Unknown=0, NotChecked=0, Total=1722 [2018-01-21 03:18:22,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 03:18:22,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 03:18:22,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 03:18:22,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2018-01-21 03:18:22,593 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 35 [2018-01-21 03:18:22,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:22,593 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2018-01-21 03:18:22,593 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 03:18:22,593 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2018-01-21 03:18:22,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 03:18:22,594 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:22,594 INFO L322 BasicCegarLoop]: trace histogram [18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:22,594 INFO L371 AbstractCegarLoop]: === Iteration 19 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:22,594 INFO L82 PathProgramCache]: Analyzing trace with hash 2064868528, now seen corresponding path program 18 times [2018-01-21 03:18:22,594 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:22,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:22,595 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:22,595 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:22,595 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:22,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:22,604 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:22,858 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:22,858 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:22,858 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:22,858 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:22,858 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:22,858 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:22,869 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:22,869 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:22,883 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,893 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,918 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,927 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,940 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,952 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,965 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,978 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:22,991 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,003 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,015 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:23,017 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:23,060 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:23,060 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:23,699 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:23,720 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:23,720 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 37 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 37 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:23,730 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:23,731 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:23,741 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,748 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,756 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,765 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,774 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,783 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,793 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,803 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,814 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,826 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:23,834 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:23,838 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:23,843 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:23,843 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:23,989 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:23,990 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:23,990 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 43 [2018-01-21 03:18:23,990 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:23,990 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 03:18:23,991 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 03:18:23,991 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2018-01-21 03:18:23,991 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 23 states. [2018-01-21 03:18:24,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:24,037 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-01-21 03:18:24,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 03:18:24,038 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 36 [2018-01-21 03:18:24,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:24,038 INFO L225 Difference]: With dead ends: 47 [2018-01-21 03:18:24,038 INFO L226 Difference]: Without dead ends: 38 [2018-01-21 03:18:24,039 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 165 GetRequests, 121 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 111 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=887, Invalid=1005, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 03:18:24,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-01-21 03:18:24,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-01-21 03:18:24,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-01-21 03:18:24,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-01-21 03:18:24,043 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 36 [2018-01-21 03:18:24,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:24,043 INFO L432 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-01-21 03:18:24,043 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 03:18:24,043 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-01-21 03:18:24,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-01-21 03:18:24,044 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:24,044 INFO L322 BasicCegarLoop]: trace histogram [19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:24,044 INFO L371 AbstractCegarLoop]: === Iteration 20 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:24,044 INFO L82 PathProgramCache]: Analyzing trace with hash 736596779, now seen corresponding path program 19 times [2018-01-21 03:18:24,044 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:24,045 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:24,045 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:24,045 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:24,045 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:24,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:24,054 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:24,255 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:24,256 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:24,256 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:24,256 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:24,256 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:24,256 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:24,256 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:24,261 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:24,261 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:24,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:24,274 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:24,282 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:24,283 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:24,947 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:24,970 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:24,970 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 39 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 39 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:24,973 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:24,973 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:24,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:25,001 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:25,006 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:25,007 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:25,168 INFO L134 CoverageAnalysis]: Checked inductivity of 190 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:25,169 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:25,169 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 45 [2018-01-21 03:18:25,169 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:25,169 INFO L409 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-01-21 03:18:25,170 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-01-21 03:18:25,170 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2018-01-21 03:18:25,170 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 24 states. [2018-01-21 03:18:25,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:25,204 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-01-21 03:18:25,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 03:18:25,205 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 37 [2018-01-21 03:18:25,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:25,205 INFO L225 Difference]: With dead ends: 48 [2018-01-21 03:18:25,205 INFO L226 Difference]: Without dead ends: 39 [2018-01-21 03:18:25,206 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 124 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=973, Invalid=1097, Unknown=0, NotChecked=0, Total=2070 [2018-01-21 03:18:25,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-01-21 03:18:25,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2018-01-21 03:18:25,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-01-21 03:18:25,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-01-21 03:18:25,208 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 37 [2018-01-21 03:18:25,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:25,208 INFO L432 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-01-21 03:18:25,209 INFO L433 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-01-21 03:18:25,209 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-01-21 03:18:25,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-01-21 03:18:25,209 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:25,209 INFO L322 BasicCegarLoop]: trace histogram [20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:25,209 INFO L371 AbstractCegarLoop]: === Iteration 21 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:25,209 INFO L82 PathProgramCache]: Analyzing trace with hash -1785121776, now seen corresponding path program 20 times [2018-01-21 03:18:25,209 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:25,210 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:25,210 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:25,210 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:25,210 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:25,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:25,219 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:25,423 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:25,423 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:25,423 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:25,423 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:25,423 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:25,423 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:25,423 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:25,428 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:25,429 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:25,437 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:25,443 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:25,446 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:25,448 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:25,459 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:25,459 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:26,243 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:26,264 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:26,264 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 41 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 41 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:26,267 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:26,267 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:26,278 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:26,290 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:26,301 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:26,305 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:26,310 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:26,310 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:26,474 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:26,475 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:26,475 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 47 [2018-01-21 03:18:26,475 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:26,476 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-21 03:18:26,476 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-21 03:18:26,476 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 03:18:26,477 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 25 states. [2018-01-21 03:18:26,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:26,528 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-01-21 03:18:26,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 03:18:26,528 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 38 [2018-01-21 03:18:26,528 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:26,529 INFO L225 Difference]: With dead ends: 49 [2018-01-21 03:18:26,529 INFO L226 Difference]: Without dead ends: 40 [2018-01-21 03:18:26,529 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 175 GetRequests, 127 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=1063, Invalid=1193, Unknown=0, NotChecked=0, Total=2256 [2018-01-21 03:18:26,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-01-21 03:18:26,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-01-21 03:18:26,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-01-21 03:18:26,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-01-21 03:18:26,532 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 38 [2018-01-21 03:18:26,532 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:26,533 INFO L432 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-01-21 03:18:26,533 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-21 03:18:26,533 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-01-21 03:18:26,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-01-21 03:18:26,533 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:26,533 INFO L322 BasicCegarLoop]: trace histogram [21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:26,533 INFO L371 AbstractCegarLoop]: === Iteration 22 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:26,534 INFO L82 PathProgramCache]: Analyzing trace with hash 1645981643, now seen corresponding path program 21 times [2018-01-21 03:18:26,534 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:26,535 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:26,535 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:26,535 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:26,535 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:26,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:26,543 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:26,845 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:26,845 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:26,845 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:26,845 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:26,846 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:26,846 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:26,846 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:26,851 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:26,851 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:26,860 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,863 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,864 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,865 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,866 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,868 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,870 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,871 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,873 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,874 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,875 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:26,876 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:26,877 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:26,889 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:26,889 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:27,740 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:27,761 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:27,762 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 43 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 43 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:27,766 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:27,766 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:27,776 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,783 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,791 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,804 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,819 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,835 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,851 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,869 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,887 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,906 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,927 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,947 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:27,962 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:27,967 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:27,975 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:27,975 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:28,124 WARN L143 SmtUtils]: Spent 147ms on a formula simplification that was a NOOP. DAG size: 71 [2018-01-21 03:18:28,269 INFO L134 CoverageAnalysis]: Checked inductivity of 231 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:28,270 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:28,270 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 49 [2018-01-21 03:18:28,270 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:28,270 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 03:18:28,271 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 03:18:28,271 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2018-01-21 03:18:28,271 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 26 states. [2018-01-21 03:18:28,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:28,300 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2018-01-21 03:18:28,300 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-01-21 03:18:28,300 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 39 [2018-01-21 03:18:28,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:28,301 INFO L225 Difference]: With dead ends: 50 [2018-01-21 03:18:28,301 INFO L226 Difference]: Without dead ends: 41 [2018-01-21 03:18:28,302 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 130 SyntacticMatches, 2 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 129 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1157, Invalid=1293, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 03:18:28,302 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2018-01-21 03:18:28,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2018-01-21 03:18:28,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 03:18:28,304 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2018-01-21 03:18:28,304 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 39 [2018-01-21 03:18:28,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:28,305 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2018-01-21 03:18:28,305 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 03:18:28,305 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2018-01-21 03:18:28,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2018-01-21 03:18:28,305 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:28,305 INFO L322 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:28,305 INFO L371 AbstractCegarLoop]: === Iteration 23 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:28,305 INFO L82 PathProgramCache]: Analyzing trace with hash 636005232, now seen corresponding path program 22 times [2018-01-21 03:18:28,305 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:28,306 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:28,306 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:28,306 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:28,306 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:28,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:28,313 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:28,499 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:28,499 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:28,499 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:28,499 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:28,499 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:28,500 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:28,500 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:28,504 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:28,504 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:28,519 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:28,521 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:28,529 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:28,529 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:29,513 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:29,537 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:29,537 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 45 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 45 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:29,540 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:29,540 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:29,575 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:29,579 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:29,584 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:29,584 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:29,752 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:29,754 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:29,754 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 51 [2018-01-21 03:18:29,754 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:29,754 INFO L409 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-01-21 03:18:29,754 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-01-21 03:18:29,755 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2018-01-21 03:18:29,755 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 27 states. [2018-01-21 03:18:29,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:29,804 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-01-21 03:18:29,804 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 03:18:29,805 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 40 [2018-01-21 03:18:29,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:29,805 INFO L225 Difference]: With dead ends: 51 [2018-01-21 03:18:29,805 INFO L226 Difference]: Without dead ends: 42 [2018-01-21 03:18:29,806 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 185 GetRequests, 133 SyntacticMatches, 2 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1255, Invalid=1397, Unknown=0, NotChecked=0, Total=2652 [2018-01-21 03:18:29,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-01-21 03:18:29,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-01-21 03:18:29,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-01-21 03:18:29,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-01-21 03:18:29,808 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 40 [2018-01-21 03:18:29,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:29,809 INFO L432 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-01-21 03:18:29,809 INFO L433 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-01-21 03:18:29,809 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-01-21 03:18:29,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-01-21 03:18:29,809 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:29,809 INFO L322 BasicCegarLoop]: trace histogram [23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:29,809 INFO L371 AbstractCegarLoop]: === Iteration 24 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:29,809 INFO L82 PathProgramCache]: Analyzing trace with hash -608492437, now seen corresponding path program 23 times [2018-01-21 03:18:29,809 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:29,810 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:29,810 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:29,810 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:29,810 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:29,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:29,819 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:30,038 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:30,038 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:30,038 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:30,038 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:30,039 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:30,039 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:30,039 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:30,043 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:30,044 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:30,048 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,049 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,049 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,050 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,051 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,052 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,052 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,053 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,054 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,055 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,056 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,056 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,061 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:30,062 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:30,064 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:30,072 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:30,072 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:31,087 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:31,113 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:31,113 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 47 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 47 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:31,116 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:31,116 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:31,121 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,123 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,128 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,133 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,137 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,142 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,147 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,152 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,158 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,166 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,175 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,183 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,198 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:31,209 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:31,213 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:31,221 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:31,222 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:31,451 INFO L134 CoverageAnalysis]: Checked inductivity of 276 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:31,452 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:31,452 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 53 [2018-01-21 03:18:31,452 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:31,452 INFO L409 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-01-21 03:18:31,453 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-01-21 03:18:31,453 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2018-01-21 03:18:31,453 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 28 states. [2018-01-21 03:18:31,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:31,496 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2018-01-21 03:18:31,496 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 03:18:31,496 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 41 [2018-01-21 03:18:31,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:31,496 INFO L225 Difference]: With dead ends: 52 [2018-01-21 03:18:31,496 INFO L226 Difference]: Without dead ends: 43 [2018-01-21 03:18:31,497 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1357, Invalid=1505, Unknown=0, NotChecked=0, Total=2862 [2018-01-21 03:18:31,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-01-21 03:18:31,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2018-01-21 03:18:31,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 03:18:31,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2018-01-21 03:18:31,500 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 41 [2018-01-21 03:18:31,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:31,500 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2018-01-21 03:18:31,500 INFO L433 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-01-21 03:18:31,500 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2018-01-21 03:18:31,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 03:18:31,500 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:31,500 INFO L322 BasicCegarLoop]: trace histogram [24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:31,500 INFO L371 AbstractCegarLoop]: === Iteration 25 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:31,501 INFO L82 PathProgramCache]: Analyzing trace with hash -533214512, now seen corresponding path program 24 times [2018-01-21 03:18:31,501 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:31,501 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:31,501 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:31,501 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:31,501 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:31,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:31,509 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:31,802 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:31,802 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:31,802 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:31,802 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:31,802 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:31,802 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:31,802 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:31,808 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:31,808 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:31,815 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,817 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,818 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,819 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,820 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,821 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,822 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,824 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,825 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,826 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,829 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:31,830 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:31,831 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:31,840 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:31,840 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:32,749 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:32,772 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:32,773 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 49 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 49 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:32,775 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:32,775 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:32,785 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,791 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,800 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,808 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,818 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,844 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,854 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,865 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,877 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,888 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,901 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,913 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:32,923 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:32,927 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:32,934 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:32,934 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:33,157 INFO L134 CoverageAnalysis]: Checked inductivity of 300 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:33,159 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:33,159 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 55 [2018-01-21 03:18:33,159 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:33,159 INFO L409 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-01-21 03:18:33,159 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-01-21 03:18:33,160 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2018-01-21 03:18:33,160 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 29 states. [2018-01-21 03:18:33,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:33,216 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-01-21 03:18:33,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 03:18:33,217 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 42 [2018-01-21 03:18:33,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:33,217 INFO L225 Difference]: With dead ends: 53 [2018-01-21 03:18:33,217 INFO L226 Difference]: Without dead ends: 44 [2018-01-21 03:18:33,218 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 139 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1463, Invalid=1617, Unknown=0, NotChecked=0, Total=3080 [2018-01-21 03:18:33,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-01-21 03:18:33,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-01-21 03:18:33,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-01-21 03:18:33,220 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-01-21 03:18:33,221 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 42 [2018-01-21 03:18:33,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:33,221 INFO L432 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-01-21 03:18:33,221 INFO L433 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-01-21 03:18:33,221 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-01-21 03:18:33,221 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-01-21 03:18:33,221 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:33,221 INFO L322 BasicCegarLoop]: trace histogram [25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:33,221 INFO L371 AbstractCegarLoop]: === Iteration 26 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:33,222 INFO L82 PathProgramCache]: Analyzing trace with hash 1800401163, now seen corresponding path program 25 times [2018-01-21 03:18:33,222 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:33,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:33,222 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:33,222 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:33,222 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:33,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:33,229 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:33,679 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:33,680 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:33,680 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:33,680 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:33,680 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:33,680 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:33,680 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:33,686 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:33,686 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:33,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:33,702 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:33,713 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:33,713 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:34,874 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:34,895 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:34,895 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 51 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 51 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:34,899 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:34,899 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:34,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:34,936 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:34,944 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:34,944 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:35,183 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 0 proven. 325 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:35,184 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:35,184 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 57 [2018-01-21 03:18:35,184 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:35,184 INFO L409 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-01-21 03:18:35,185 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-01-21 03:18:35,185 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2018-01-21 03:18:35,185 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 30 states. [2018-01-21 03:18:35,228 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:35,228 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-01-21 03:18:35,228 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 03:18:35,228 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 43 [2018-01-21 03:18:35,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:35,229 INFO L225 Difference]: With dead ends: 54 [2018-01-21 03:18:35,229 INFO L226 Difference]: Without dead ends: 45 [2018-01-21 03:18:35,230 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 200 GetRequests, 142 SyntacticMatches, 2 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1573, Invalid=1733, Unknown=0, NotChecked=0, Total=3306 [2018-01-21 03:18:35,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-01-21 03:18:35,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-01-21 03:18:35,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-01-21 03:18:35,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-01-21 03:18:35,234 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 43 [2018-01-21 03:18:35,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:35,234 INFO L432 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-01-21 03:18:35,234 INFO L433 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-01-21 03:18:35,234 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-01-21 03:18:35,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-01-21 03:18:35,235 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:35,235 INFO L322 BasicCegarLoop]: trace histogram [26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:35,235 INFO L371 AbstractCegarLoop]: === Iteration 27 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:35,235 INFO L82 PathProgramCache]: Analyzing trace with hash 1128043056, now seen corresponding path program 26 times [2018-01-21 03:18:35,235 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:35,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:35,236 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:35,236 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:35,236 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:35,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:35,243 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:35,541 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:35,541 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:35,541 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:35,541 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:35,541 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:35,541 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:35,546 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:35,546 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:35,553 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:35,559 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:35,560 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:35,562 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:35,573 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:35,573 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:36,621 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:36,644 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:36,644 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 53 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 53 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:36,647 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:36,648 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:36,658 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:36,673 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:36,685 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:36,688 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:36,694 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:36,695 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:36,956 INFO L134 CoverageAnalysis]: Checked inductivity of 351 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:36,957 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:36,957 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 59 [2018-01-21 03:18:36,957 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:36,957 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 03:18:36,958 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 03:18:36,958 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 03:18:36,958 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 31 states. [2018-01-21 03:18:37,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:37,006 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-01-21 03:18:37,020 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-01-21 03:18:37,020 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 44 [2018-01-21 03:18:37,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:37,021 INFO L225 Difference]: With dead ends: 55 [2018-01-21 03:18:37,021 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 03:18:37,022 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1687, Invalid=1853, Unknown=0, NotChecked=0, Total=3540 [2018-01-21 03:18:37,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 03:18:37,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-01-21 03:18:37,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-01-21 03:18:37,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-01-21 03:18:37,025 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 44 [2018-01-21 03:18:37,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:37,025 INFO L432 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-01-21 03:18:37,026 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 03:18:37,026 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-01-21 03:18:37,026 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-01-21 03:18:37,026 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:37,026 INFO L322 BasicCegarLoop]: trace histogram [27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:37,027 INFO L371 AbstractCegarLoop]: === Iteration 28 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:37,028 INFO L82 PathProgramCache]: Analyzing trace with hash 1759778219, now seen corresponding path program 27 times [2018-01-21 03:18:37,028 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:37,029 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:37,029 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:37,029 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:37,029 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:37,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:37,038 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:37,441 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:37,441 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:37,441 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:37,441 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:37,441 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:37,441 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:37,441 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:37,446 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:37,446 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:37,453 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,455 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,456 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,457 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,458 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,459 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,460 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,461 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,462 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,463 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,464 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,466 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,467 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,468 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,469 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:37,470 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:37,471 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:37,480 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:37,480 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:38,591 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:38,611 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:38,611 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 55 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 55 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:38,614 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:38,614 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:38,624 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,631 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,640 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,648 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,657 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,667 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,678 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,689 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,701 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,713 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,726 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,744 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,766 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,789 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,813 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:38,828 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:38,832 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:38,850 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:38,850 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:39,169 WARN L143 SmtUtils]: Spent 127ms on a formula simplification that was a NOOP. DAG size: 89 [2018-01-21 03:18:39,189 INFO L134 CoverageAnalysis]: Checked inductivity of 378 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:39,190 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:39,190 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 61 [2018-01-21 03:18:39,190 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:39,190 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 03:18:39,191 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 03:18:39,191 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2018-01-21 03:18:39,191 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 32 states. [2018-01-21 03:18:39,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:39,297 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2018-01-21 03:18:39,298 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-01-21 03:18:39,298 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 45 [2018-01-21 03:18:39,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:39,298 INFO L225 Difference]: With dead ends: 56 [2018-01-21 03:18:39,298 INFO L226 Difference]: Without dead ends: 47 [2018-01-21 03:18:39,299 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 148 SyntacticMatches, 2 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1805, Invalid=1977, Unknown=0, NotChecked=0, Total=3782 [2018-01-21 03:18:39,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2018-01-21 03:18:39,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2018-01-21 03:18:39,301 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2018-01-21 03:18:39,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2018-01-21 03:18:39,301 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 45 [2018-01-21 03:18:39,302 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:39,302 INFO L432 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2018-01-21 03:18:39,302 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 03:18:39,302 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2018-01-21 03:18:39,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2018-01-21 03:18:39,302 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:39,302 INFO L322 BasicCegarLoop]: trace histogram [28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:39,302 INFO L371 AbstractCegarLoop]: === Iteration 29 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:39,302 INFO L82 PathProgramCache]: Analyzing trace with hash -131268208, now seen corresponding path program 28 times [2018-01-21 03:18:39,303 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:39,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:39,303 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:39,303 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:39,303 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:39,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:39,312 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:39,711 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:39,711 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:39,712 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:39,712 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:39,712 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:39,712 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:39,717 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:39,717 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:39,734 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:39,736 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:39,747 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:39,748 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:41,039 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:41,060 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:41,060 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 57 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 57 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:41,064 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:41,064 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:41,116 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:41,121 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:41,127 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:41,128 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:41,400 INFO L134 CoverageAnalysis]: Checked inductivity of 406 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:41,402 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:41,402 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 63 [2018-01-21 03:18:41,402 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:41,403 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-21 03:18:41,403 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-21 03:18:41,403 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1893, Invalid=2013, Unknown=0, NotChecked=0, Total=3906 [2018-01-21 03:18:41,404 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 33 states. [2018-01-21 03:18:41,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:41,499 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-01-21 03:18:41,499 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 03:18:41,499 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 46 [2018-01-21 03:18:41,499 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:41,500 INFO L225 Difference]: With dead ends: 57 [2018-01-21 03:18:41,500 INFO L226 Difference]: Without dead ends: 48 [2018-01-21 03:18:41,500 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 151 SyntacticMatches, 2 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1927, Invalid=2105, Unknown=0, NotChecked=0, Total=4032 [2018-01-21 03:18:41,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-01-21 03:18:41,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-01-21 03:18:41,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-01-21 03:18:41,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-01-21 03:18:41,503 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 46 [2018-01-21 03:18:41,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:41,504 INFO L432 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-01-21 03:18:41,504 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-21 03:18:41,504 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-01-21 03:18:41,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 03:18:41,504 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:41,504 INFO L322 BasicCegarLoop]: trace histogram [29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:41,504 INFO L371 AbstractCegarLoop]: === Iteration 30 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:41,504 INFO L82 PathProgramCache]: Analyzing trace with hash 1375834699, now seen corresponding path program 29 times [2018-01-21 03:18:41,505 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:41,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:41,505 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:41,505 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:41,505 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:41,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:41,512 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:42,013 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:42,014 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:42,014 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:42,014 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:42,014 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:42,014 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:42,014 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:42,026 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:42,026 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:42,031 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,032 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,033 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,034 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,035 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,036 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,037 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,038 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,039 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,040 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,042 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,043 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,046 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,047 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,048 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,053 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:42,054 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:42,057 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:42,096 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:42,096 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:42,201 WARN L143 SmtUtils]: Spent 103ms on a formula simplification that was a NOOP. DAG size: 95 [2018-01-21 03:18:43,624 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:43,644 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:43,644 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 59 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 59 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:43,647 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:18:43,647 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:43,652 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,654 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,659 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,664 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,669 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,676 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,684 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,692 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,701 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,711 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,722 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,733 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,744 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,757 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,768 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,783 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:43,795 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:43,800 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:43,806 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:43,806 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:44,152 INFO L134 CoverageAnalysis]: Checked inductivity of 435 backedges. 0 proven. 435 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:44,153 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:44,153 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 65 [2018-01-21 03:18:44,153 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:44,153 INFO L409 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-01-21 03:18:44,154 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-01-21 03:18:44,154 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2018, Invalid=2142, Unknown=0, NotChecked=0, Total=4160 [2018-01-21 03:18:44,154 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 34 states. [2018-01-21 03:18:44,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:44,217 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2018-01-21 03:18:44,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 03:18:44,220 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 47 [2018-01-21 03:18:44,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:44,221 INFO L225 Difference]: With dead ends: 58 [2018-01-21 03:18:44,221 INFO L226 Difference]: Without dead ends: 49 [2018-01-21 03:18:44,222 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 154 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2053, Invalid=2237, Unknown=0, NotChecked=0, Total=4290 [2018-01-21 03:18:44,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-01-21 03:18:44,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2018-01-21 03:18:44,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2018-01-21 03:18:44,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2018-01-21 03:18:44,226 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 47 [2018-01-21 03:18:44,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:44,226 INFO L432 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2018-01-21 03:18:44,226 INFO L433 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-01-21 03:18:44,227 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2018-01-21 03:18:44,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2018-01-21 03:18:44,227 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:44,227 INFO L322 BasicCegarLoop]: trace histogram [30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:44,227 INFO L371 AbstractCegarLoop]: === Iteration 31 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:44,228 INFO L82 PathProgramCache]: Analyzing trace with hash 851384560, now seen corresponding path program 30 times [2018-01-21 03:18:44,228 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:44,228 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:44,229 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:44,229 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:44,229 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:44,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:44,239 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:44,797 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:44,797 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:44,797 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:44,798 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:44,798 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:44,798 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:44,798 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:44,803 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:44,803 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:44,811 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,813 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,814 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,815 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,816 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,818 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,819 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,820 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,822 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,823 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,825 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,826 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,827 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,828 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,830 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,832 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:44,833 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:44,834 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:44,845 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:44,845 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:46,394 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:46,414 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:46,414 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 61 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 61 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:46,417 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:18:46,418 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:18:46,430 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,437 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,449 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,460 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,473 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,487 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,499 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,511 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,525 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,539 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,554 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,570 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,587 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,609 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,630 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,646 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:18:46,658 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:46,663 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:46,673 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:46,674 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:47,305 WARN L143 SmtUtils]: Spent 629ms on a formula simplification that was a NOOP. DAG size: 98 [2018-01-21 03:18:47,547 WARN L143 SmtUtils]: Spent 241ms on a formula simplification that was a NOOP. DAG size: 98 [2018-01-21 03:18:47,708 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:47,709 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:47,709 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 67 [2018-01-21 03:18:47,709 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:47,710 INFO L409 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-01-21 03:18:47,710 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-01-21 03:18:47,710 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2147, Invalid=2275, Unknown=0, NotChecked=0, Total=4422 [2018-01-21 03:18:47,710 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 35 states. [2018-01-21 03:18:47,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:47,787 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-01-21 03:18:47,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-01-21 03:18:47,787 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 48 [2018-01-21 03:18:47,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:47,788 INFO L225 Difference]: With dead ends: 59 [2018-01-21 03:18:47,788 INFO L226 Difference]: Without dead ends: 50 [2018-01-21 03:18:47,788 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 225 GetRequests, 157 SyntacticMatches, 2 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 183 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2183, Invalid=2373, Unknown=0, NotChecked=0, Total=4556 [2018-01-21 03:18:47,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-01-21 03:18:47,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-01-21 03:18:47,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 03:18:47,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-01-21 03:18:47,791 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 48 [2018-01-21 03:18:47,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:47,792 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-01-21 03:18:47,792 INFO L433 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-01-21 03:18:47,792 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-01-21 03:18:47,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-01-21 03:18:47,792 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:47,792 INFO L322 BasicCegarLoop]: trace histogram [31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:47,793 INFO L371 AbstractCegarLoop]: === Iteration 32 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:47,793 INFO L82 PathProgramCache]: Analyzing trace with hash 1773299435, now seen corresponding path program 31 times [2018-01-21 03:18:47,793 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:47,794 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:47,794 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:47,794 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:47,794 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:47,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:47,804 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:48,206 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:48,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:48,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:48,206 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:48,206 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:48,206 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:48,206 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:48,211 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:48,211 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:48,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:48,230 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:48,240 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:48,240 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:49,679 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:49,699 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:49,699 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 63 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 63 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:49,703 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:49,703 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 03:18:49,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:49,742 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:49,748 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:49,749 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:50,042 INFO L134 CoverageAnalysis]: Checked inductivity of 496 backedges. 0 proven. 496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:50,043 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:50,043 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 69 [2018-01-21 03:18:50,044 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:50,044 INFO L409 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-01-21 03:18:50,044 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-01-21 03:18:50,045 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2280, Invalid=2412, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 03:18:50,045 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 36 states. [2018-01-21 03:18:50,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:50,099 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-01-21 03:18:50,100 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 03:18:50,100 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 49 [2018-01-21 03:18:50,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:50,100 INFO L225 Difference]: With dead ends: 60 [2018-01-21 03:18:50,101 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 03:18:50,101 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 230 GetRequests, 160 SyntacticMatches, 2 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=2317, Invalid=2513, Unknown=0, NotChecked=0, Total=4830 [2018-01-21 03:18:50,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 03:18:50,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2018-01-21 03:18:50,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-01-21 03:18:50,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-01-21 03:18:50,104 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 49 [2018-01-21 03:18:50,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:50,104 INFO L432 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-01-21 03:18:50,104 INFO L433 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-01-21 03:18:50,104 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-01-21 03:18:50,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-01-21 03:18:50,105 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:50,105 INFO L322 BasicCegarLoop]: trace histogram [32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:50,105 INFO L371 AbstractCegarLoop]: === Iteration 33 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:50,105 INFO L82 PathProgramCache]: Analyzing trace with hash 287889488, now seen corresponding path program 32 times [2018-01-21 03:18:50,105 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:50,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:50,106 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 03:18:50,106 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:50,106 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:50,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:50,115 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:50,551 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:50,551 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:50,552 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:50,552 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:50,552 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:50,552 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:50,552 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:50,557 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:50,558 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:50,566 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:50,574 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:50,575 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:50,577 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:50,588 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:52,198 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:52,219 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:52,219 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 65 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 65 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:52,222 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 03:18:52,222 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:18:52,234 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:52,251 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:18:52,266 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:52,270 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:52,279 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:52,280 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:52,641 INFO L134 CoverageAnalysis]: Checked inductivity of 528 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:52,643 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:52,643 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 71 [2018-01-21 03:18:52,643 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:52,643 INFO L409 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-01-21 03:18:52,644 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-01-21 03:18:52,644 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2417, Invalid=2553, Unknown=0, NotChecked=0, Total=4970 [2018-01-21 03:18:52,644 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 37 states. [2018-01-21 03:18:52,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:52,999 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-01-21 03:18:52,999 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2018-01-21 03:18:52,999 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 50 [2018-01-21 03:18:52,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:53,000 INFO L225 Difference]: With dead ends: 61 [2018-01-21 03:18:53,000 INFO L226 Difference]: Without dead ends: 52 [2018-01-21 03:18:53,000 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 163 SyntacticMatches, 2 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=2455, Invalid=2657, Unknown=0, NotChecked=0, Total=5112 [2018-01-21 03:18:53,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-01-21 03:18:53,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-01-21 03:18:53,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-01-21 03:18:53,002 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-01-21 03:18:53,003 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 50 [2018-01-21 03:18:53,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:53,003 INFO L432 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-01-21 03:18:53,003 INFO L433 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-01-21 03:18:53,003 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-01-21 03:18:53,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-01-21 03:18:53,004 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:53,004 INFO L322 BasicCegarLoop]: trace histogram [33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:53,004 INFO L371 AbstractCegarLoop]: === Iteration 34 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:53,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1484821387, now seen corresponding path program 33 times [2018-01-21 03:18:53,004 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:53,005 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:53,005 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:53,005 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:53,005 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:53,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:53,011 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:53,578 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:53,579 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:53,579 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:53,579 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:53,579 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:53,579 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:53,579 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:53,584 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:53,584 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:53,593 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,595 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,596 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,597 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,599 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,600 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,602 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,603 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,605 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,606 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,608 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,609 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,611 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,613 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,614 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,616 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,622 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,623 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:53,623 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:53,625 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:53,635 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:53,636 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:55,100 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:56,247 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:56,247 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 67 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 67 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:56,251 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 03:18:56,252 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 03:18:56,269 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,283 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,298 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,313 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,328 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,344 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,356 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,367 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,379 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,392 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,405 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,419 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,434 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,449 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,465 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,481 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,497 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 03:18:56,526 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:56,530 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:56,537 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:56,537 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:56,868 INFO L134 CoverageAnalysis]: Checked inductivity of 561 backedges. 0 proven. 561 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:56,869 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:18:56,869 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 73 [2018-01-21 03:18:56,869 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:18:56,870 INFO L409 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-01-21 03:18:56,870 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-01-21 03:18:56,870 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2558, Invalid=2698, Unknown=0, NotChecked=0, Total=5256 [2018-01-21 03:18:56,870 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 38 states. [2018-01-21 03:18:56,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:18:56,913 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2018-01-21 03:18:56,913 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-01-21 03:18:56,913 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 51 [2018-01-21 03:18:56,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:18:56,913 INFO L225 Difference]: With dead ends: 62 [2018-01-21 03:18:56,914 INFO L226 Difference]: Without dead ends: 53 [2018-01-21 03:18:56,914 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 166 SyntacticMatches, 2 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 201 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2597, Invalid=2805, Unknown=0, NotChecked=0, Total=5402 [2018-01-21 03:18:56,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2018-01-21 03:18:56,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2018-01-21 03:18:56,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-01-21 03:18:56,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2018-01-21 03:18:56,917 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 51 [2018-01-21 03:18:56,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:18:56,918 INFO L432 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2018-01-21 03:18:56,918 INFO L433 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-01-21 03:18:56,918 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2018-01-21 03:18:56,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2018-01-21 03:18:56,918 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:18:56,919 INFO L322 BasicCegarLoop]: trace histogram [34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:18:56,919 INFO L371 AbstractCegarLoop]: === Iteration 35 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:18:56,919 INFO L82 PathProgramCache]: Analyzing trace with hash -64995408, now seen corresponding path program 34 times [2018-01-21 03:18:56,919 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:18:56,919 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:56,920 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:18:56,920 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:18:56,920 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:18:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:18:56,929 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:18:57,508 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:57,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:57,508 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:18:57,508 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:18:57,508 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:18:57,508 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:57,508 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:18:57,513 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:57,513 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:57,532 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:57,534 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:57,544 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:57,544 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:18:58,164 WARN L143 SmtUtils]: Spent 436ms on a formula simplification that was a NOOP. DAG size: 110 [2018-01-21 03:18:59,675 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:59,696 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:18:59,696 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 69 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 69 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:18:59,700 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 03:18:59,700 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 03:18:59,749 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:18:59,754 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:18:59,763 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:18:59,764 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:19:00,125 INFO L134 CoverageAnalysis]: Checked inductivity of 595 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:00,126 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:19:00,126 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 75 [2018-01-21 03:19:00,127 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:19:00,127 INFO L409 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-01-21 03:19:00,127 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-01-21 03:19:00,127 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2703, Invalid=2847, Unknown=0, NotChecked=0, Total=5550 [2018-01-21 03:19:00,127 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 39 states. [2018-01-21 03:19:00,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:19:00,192 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-01-21 03:19:00,192 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 03:19:00,192 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 52 [2018-01-21 03:19:00,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:19:00,193 INFO L225 Difference]: With dead ends: 63 [2018-01-21 03:19:00,193 INFO L226 Difference]: Without dead ends: 54 [2018-01-21 03:19:00,193 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 245 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 207 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=2743, Invalid=2957, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 03:19:00,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-01-21 03:19:00,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-01-21 03:19:00,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-01-21 03:19:00,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-01-21 03:19:00,196 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 52 [2018-01-21 03:19:00,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:19:00,196 INFO L432 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-01-21 03:19:00,196 INFO L433 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-01-21 03:19:00,196 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-01-21 03:19:00,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-01-21 03:19:00,196 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:19:00,196 INFO L322 BasicCegarLoop]: trace histogram [35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:19:00,197 INFO L371 AbstractCegarLoop]: === Iteration 36 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:19:00,197 INFO L82 PathProgramCache]: Analyzing trace with hash -864675797, now seen corresponding path program 35 times [2018-01-21 03:19:00,197 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:19:00,198 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:19:00,198 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:19:00,198 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:19:00,198 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:19:00,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:19:00,209 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:19:00,727 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:00,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:19:00,727 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:19:00,727 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:19:00,727 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:19:00,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:19:00,727 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:19:00,732 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:19:00,732 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:19:00,736 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,738 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,738 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,739 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,740 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,741 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,742 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,743 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,743 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,744 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,745 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,746 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,747 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,748 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,749 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,750 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,752 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,753 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,757 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:00,758 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:19:00,760 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:19:00,774 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:00,775 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:19:02,516 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:02,537 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:19:02,537 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 71 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 71 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 03:19:02,540 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 03:19:02,540 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 03:19:02,547 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,550 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,555 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,562 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,569 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,576 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,584 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,593 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,603 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,614 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,625 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,637 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,649 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,663 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,678 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,693 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,709 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,726 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,752 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 03:19:02,771 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:19:02,776 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:19:02,783 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:02,783 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 03:19:03,124 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 630 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:03,125 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 03:19:03,126 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 77 [2018-01-21 03:19:03,126 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 03:19:03,126 INFO L409 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-01-21 03:19:03,126 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-01-21 03:19:03,126 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2852, Invalid=3000, Unknown=0, NotChecked=0, Total=5852 [2018-01-21 03:19:03,127 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 40 states. [2018-01-21 03:19:03,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 03:19:03,177 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2018-01-21 03:19:03,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-01-21 03:19:03,177 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 53 [2018-01-21 03:19:03,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 03:19:03,178 INFO L225 Difference]: With dead ends: 64 [2018-01-21 03:19:03,178 INFO L226 Difference]: Without dead ends: 55 [2018-01-21 03:19:03,178 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 250 GetRequests, 172 SyntacticMatches, 2 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2893, Invalid=3113, Unknown=0, NotChecked=0, Total=6006 [2018-01-21 03:19:03,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-01-21 03:19:03,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2018-01-21 03:19:03,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 03:19:03,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2018-01-21 03:19:03,181 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 53 [2018-01-21 03:19:03,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 03:19:03,181 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2018-01-21 03:19:03,181 INFO L433 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-01-21 03:19:03,181 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2018-01-21 03:19:03,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2018-01-21 03:19:03,181 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 03:19:03,182 INFO L322 BasicCegarLoop]: trace histogram [36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 03:19:03,182 INFO L371 AbstractCegarLoop]: === Iteration 37 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 03:19:03,182 INFO L82 PathProgramCache]: Analyzing trace with hash 115035920, now seen corresponding path program 36 times [2018-01-21 03:19:03,182 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 03:19:03,182 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:19:03,183 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 03:19:03,183 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 03:19:03,183 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 03:19:03,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 03:19:03,192 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 03:19:03,703 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:03,704 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:19:03,704 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 03:19:03,704 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 03:19:03,704 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 03:19:03,704 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 03:19:03,704 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 03:19:03,709 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 03:19:03,709 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 03:19:03,716 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,718 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,720 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,721 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,722 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,723 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,724 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,725 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,727 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,728 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,729 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,730 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,732 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,733 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,734 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,736 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,737 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,738 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,739 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 03:19:03,740 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 03:19:03,742 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 03:19:03,752 INFO L134 CoverageAnalysis]: Checked inductivity of 666 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 03:19:03,752 INFO L314 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-01-21 03:19:04,291 INFO L175 TraceCheckSpWp]: Timeout while computing interpolants [2018-01-21 03:19:04,291 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 03:19:04,293 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 03:19:04,293 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 03:19:04,293 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 03:19:04,293 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 03:19:04,293 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 03:19:04,294 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 03:19:04,294 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 03:19:04,294 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == mainErr0EnsuresViolation======== [2018-01-21 03:19:04,294 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 03:19:04,294 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2018-01-21 03:19:04,294 WARN L491 AbstractCegarLoop]: Verification canceled [2018-01-21 03:19:04,295 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 21.01 03:19:04 BoogieIcfgContainer [2018-01-21 03:19:04,295 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-01-21 03:19:04,296 INFO L168 Benchmark]: Toolchain (without parser) took 56984.62 ms. Allocated memory was 307.2 MB in the beginning and 814.2 MB in the end (delta: 507.0 MB). Free memory was 266.5 MB in the beginning and 450.5 MB in the end (delta: -184.0 MB). Peak memory consumption was 323.0 MB. Max. memory is 5.3 GB. [2018-01-21 03:19:04,297 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 307.2 MB. Free memory is still 271.5 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-01-21 03:19:04,297 INFO L168 Benchmark]: CACSL2BoogieTranslator took 210.98 ms. Allocated memory is still 307.2 MB. Free memory was 265.6 MB in the beginning and 258.5 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. [2018-01-21 03:19:04,297 INFO L168 Benchmark]: Boogie Preprocessor took 29.26 ms. Allocated memory is still 307.2 MB. Free memory was 258.5 MB in the beginning and 256.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-01-21 03:19:04,297 INFO L168 Benchmark]: RCFGBuilder took 216.55 ms. Allocated memory is still 307.2 MB. Free memory was 256.5 MB in the beginning and 244.8 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. [2018-01-21 03:19:04,297 INFO L168 Benchmark]: TraceAbstraction took 56517.24 ms. Allocated memory was 307.2 MB in the beginning and 814.2 MB in the end (delta: 507.0 MB). Free memory was 243.8 MB in the beginning and 450.5 MB in the end (delta: -206.7 MB). Peak memory consumption was 300.3 MB. Max. memory is 5.3 GB. [2018-01-21 03:19:04,299 INFO L344 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 307.2 MB. Free memory is still 271.5 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 210.98 ms. Allocated memory is still 307.2 MB. Free memory was 265.6 MB in the beginning and 258.5 MB in the end (delta: 7.1 MB). Peak memory consumption was 7.1 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 29.26 ms. Allocated memory is still 307.2 MB. Free memory was 258.5 MB in the beginning and 256.5 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * RCFGBuilder took 216.55 ms. Allocated memory is still 307.2 MB. Free memory was 256.5 MB in the beginning and 244.8 MB in the end (delta: 11.6 MB). Peak memory consumption was 11.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 56517.24 ms. Allocated memory was 307.2 MB in the beginning and 814.2 MB in the end (delta: 507.0 MB). Free memory was 243.8 MB in the beginning and 450.5 MB in the end (delta: -206.7 MB). Peak memory consumption was 300.3 MB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.analysis.abstractinterpretationv2: - StatisticsResult: ArrayEqualityDomainStatistics #Locations : 18 LocStat_MAX_WEQGRAPH_SIZE : 2 LocStat_MAX_SIZEOF_WEQEDGELABEL : 1 LocStat_NO_SUPPORTING_EQUALITIES : 126 LocStat_NO_SUPPORTING_DISEQUALITIES : 29 LocStat_NO_DISJUNCTIONS : -36 LocStat_MAX_NO_DISJUNCTIONS : -1 #Transitions : 25 TransStat_MAX_WEQGRAPH_SIZE : 2 TransStat_MAX_SIZEOF_WEQEDGELABEL : 1 TransStat_NO_SUPPORTING_EQUALITIES : 35 TransStat_NO_SUPPORTING_DISEQUALITIES : 5 TransStat_NO_DISJUNCTIONS : 25 TransStat_MAX_NO_DISJUNCTIONS : 1 - StatisticsResult: EqConstraintFactoryStatistics CONJOIN_DISJUNCTIVE(MILLISECONDS) : 0.218416 RENAME_VARIABLES(MILLISECONDS) : 0.074007 UNFREEZE(MILLISECONDS) : 0.000000 CONJOIN(MILLISECONDS) : 0.169063 PROJECTAWAY(MILLISECONDS) : 0.064804 ADD_WEAK_EQUALITY(MILLISECONDS) : 0.137446 DISJOIN(MILLISECONDS) : 0.000000 RENAME_VARIABLES_DISJUNCTIVE(MILLISECONDS) : 0.110296 ADD_EQUALITY(MILLISECONDS) : 0.038688 DISJOIN_DISJUNCTIVE(MILLISECONDS) : 0.000000 ADD_DISEQUALITY(MILLISECONDS) : 0.013744 #CONJOIN_DISJUNCTIVE : 34 #RENAME_VARIABLES : 64 #UNFREEZE : 0 #CONJOIN : 64 #PROJECTAWAY : 66 #ADD_WEAK_EQUALITY : 4 #DISJOIN : 0 #RENAME_VARIABLES_DISJUNCTIVE : 64 #ADD_EQUALITY : 35 #DISJOIN_DISJUNCTIVE : 0 #ADD_DISEQUALITY : 2 * Results from de.uni_freiburg.informatik.ultimate.boogie.preprocessor: - GenericResult: Unfinished Backtranslation Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 1]: not all allocated memory was freed not all allocated memory was freed We found a FailurePath: - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.initErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. UNSAFE Result, 0.2s OverallTime, 1 OverallIterations, 1 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.0s InterpolantComputationTime, 3 NumberOfCodeBlocks, 3 NumberOfCodeBlocksAsserted, 1 NumberOfCheckSat, 0 ConstructedInterpolants, 0 QuantifiedInterpolants, 0 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 0 InterpolantComputations, 0 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 1]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 1). Cancelled while BasicCegarLoop was analyzing trace of length 55 with TraceHistMax 36, while TraceCheckSpWp was constructing backward predicates, while PredicateComparison was comparing new predicate (quantifier-free) to 48 known predicates. - StatisticsResult: Ultimate Automizer benchmark data for error location: ULTIMATE.startErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 56.2s OverallTime, 37 OverallIterations, 36 TraceHistogramMax, 2.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 615 SDtfs, 72 SDslu, 8455 SDs, 0 SdLazy, 1356 SolverSat, 50 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5780 GetRequests, 4237 SyntacticMatches, 70 SemanticMatches, 1473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3884 ImplicationChecksByTransitivity, 29.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=55occurred in iteration=36, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 1.1s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 36 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 3.5s SatisfiabilityAnalysisTime, 46.2s InterpolantComputationTime, 3798 NumberOfCodeBlocks, 3798 NumberOfCodeBlocksAsserted, 460 NumberOfCheckSat, 6142 ConstructedInterpolants, 0 QuantifiedInterpolants, 842806 SizeOfPredicates, 70 NumberOfNonLiveVariables, 8330 ConjunctsInSsa, 1470 ConjunctsInUnsatCore, 176 InterpolantComputations, 1 PerfectInterpolantSequences, 0/38850 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, REUSE_STATISTICS: No data available - TimeoutResultAtElement [Line: 25]: Timeout (TraceAbstraction) Unable to prove that all allocated memory was freed (line 25). Cancelled while IsEmpty was searching accepting run (input had 22 states). - StatisticsResult: Ultimate Automizer benchmark data for error location: mainErr0EnsuresViolation CFG has 4 procedures, 22 locations, 3 error locations. TIMEOUT Result, 0.0s OverallTime, 0 OverallIterations, 0 TraceHistogramMax, 0.0s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: No data available, PredicateUnifierStatistics: No data available, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, AutomataMinimizationStatistics: No data available, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: No data available, REUSE_STATISTICS: No data available RESULT: Ultimate proved your program to be incorrect! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-Benchmark-0-2018-01-21_03-19-04-308.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-VPDomainBenchmark-0-2018-01-21_03-19-04-308.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-BenchmarkWithCounters-0-2018-01-21_03-19-04-308.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-0-2018-01-21_03-19-04-308.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-1-2018-01-21_03-19-04-308.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/memset3_false-valid-deref-write.c_mempurity-32bit-Automizer_Taipan+AI_EQ_mostprecise.epf_AutomizerC.xml/Csv-TraceAbstractionBenchmarks-2-2018-01-21_03-19-04-308.csv Completed graceful shutdown