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_preciseopt.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 08:43:21,072 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 08:43:21,074 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 08:43:21,088 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 08:43:21,088 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 08:43:21,089 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 08:43:21,090 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 08:43:21,092 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 08:43:21,094 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 08:43:21,094 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 08:43:21,095 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 08:43:21,095 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 08:43:21,095 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 08:43:21,096 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 08:43:21,097 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 08:43:21,099 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 08:43:21,102 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 08:43:21,103 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 08:43:21,105 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 08:43:21,106 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 08:43:21,108 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-01-21 08:43:21,113 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 08:43:21,114 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 08:43:21,114 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_preciseopt.epf [2018-01-21 08:43:21,124 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 08:43:21,124 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 08:43:21,125 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 08:43:21,125 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 08:43:21,125 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 08:43:21,125 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 08:43:21,126 INFO L133 SettingsManager]: * Flatten before fatten=true [2018-01-21 08:43:21,126 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 08:43:21,126 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 08:43:21,127 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 08:43:21,127 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 08:43:21,127 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 08:43:21,127 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 08:43:21,128 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 08:43:21,129 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 08:43:21,129 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 08:43:21,129 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 08:43:21,129 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 08:43:21,129 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 08:43:21,130 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 08:43:21,130 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 08:43:21,130 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 08:43:21,130 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 08:43:21,130 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 08:43:21,131 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 08:43:21,132 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 08:43:21,132 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 08:43:21,132 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 08:43:21,133 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 08:43:21,133 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 08:43:21,168 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 08:43:21,181 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 08:43:21,185 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 08:43:21,186 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 08:43:21,187 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 08:43:21,188 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 08:43:21,312 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 08:43:21,317 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 08:43:21,318 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 08:43:21,319 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 08:43:21,326 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 08:43:21,328 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,331 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1285ed85 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21, skipping insertion in model container [2018-01-21 08:43:21,331 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,352 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:43:21,371 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 08:43:21,483 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:43:21,499 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 08:43:21,504 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21 WrapperNode [2018-01-21 08:43:21,504 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 08:43:21,504 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 08:43:21,505 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 08:43:21,505 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 08:43:21,515 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,523 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,523 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,526 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,528 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,529 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (1/1) ... [2018-01-21 08:43:21,531 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 08:43:21,531 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 08:43:21,531 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 08:43:21,531 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 08:43:21,532 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (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 08:43:21,577 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 08:43:21,577 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 08:43:21,577 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 08:43:21,577 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 08:43:21,577 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 08:43:21,577 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 08:43:21,577 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 08:43:21,577 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 08:43:21,577 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 08:43:21,578 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 08:43:21,578 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 08:43:21,578 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 08:43:21,578 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 08:43:21,739 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 08:43:21,740 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:43:21 BoogieIcfgContainer [2018-01-21 08:43:21,740 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 08:43:21,740 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 08:43:21,740 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 08:43:21,742 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 08:43:21,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 08:43:21" (1/3) ... [2018-01-21 08:43:21,743 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18292428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:43:21, skipping insertion in model container [2018-01-21 08:43:21,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 08:43:21" (2/3) ... [2018-01-21 08:43:21,743 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18292428 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 08:43:21, skipping insertion in model container [2018-01-21 08:43:21,744 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 08:43:21" (3/3) ... [2018-01-21 08:43:21,745 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysWithLenghtAtDeclaration_false-valid-deref-write.c [2018-01-21 08:43:21,751 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 08:43:21,756 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 08:43:21,795 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:43:21,795 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:43:21,795 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:43:21,795 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:43:21,796 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:43:21,796 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:43:21,796 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:43:21,796 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 08:43:21,796 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:43:21,814 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:43:21,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 08:43:21,821 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:21,822 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 08:43:21,822 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 08:43:21,827 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 08:43:21,830 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:21,876 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:21,877 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:21,877 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:21,877 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:21,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:43:21,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 08:43:21,932 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 08:43:21,938 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 08:43:21,943 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:43:21,943 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:43:21,943 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:43:21,943 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:43:21,943 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:43:21,943 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:43:21,943 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:43:21,944 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 08:43:21,944 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:43:21,945 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:43:21,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 08:43:21,946 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:21,946 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:21,946 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 08:43:21,946 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 08:43:21,947 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:21,947 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:21,948 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:21,948 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:21,948 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:21,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:21,972 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:22,002 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 08:43:22,003 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:43:22,004 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:43:22,004 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:43:22,005 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:43:22,015 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:43:22,016 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:43:22,019 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:43:22,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:22,048 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:43:22,048 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:43:22,049 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 08:43:22,050 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:22,057 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:43:22,057 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 08:43:22,061 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:43:22,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 08:43:22,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 08:43:22,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 08:43:22,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 08:43:22,149 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 08:43:22,149 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:22,149 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 08:43:22,149 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:43:22,150 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 08:43:22,150 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 08:43:22,153 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 08:43:22,153 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 08:43:22,153 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 08:43:22,153 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 08:43:22,153 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 08:43:22,153 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 08:43:22,154 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 08:43:22,154 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 08:43:22,154 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 08:43:22,155 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 08:43:22,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 08:43:22,156 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:22,156 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:22,156 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:22,156 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 08:43:22,157 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:22,157 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,157 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:22,158 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,158 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:22,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:22,165 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:22,174 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 08:43:22,174 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:43:22,174 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 08:43:22,174 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:43:22,175 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 08:43:22,175 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 08:43:22,175 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:43:22,175 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 08:43:22,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:22,179 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 08:43:22,179 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 08:43:22,180 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 08:43:22,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:22,181 INFO L225 Difference]: With dead ends: 72 [2018-01-21 08:43:22,181 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 08:43:22,182 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 08:43:22,182 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 08:43:22,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 08:43:22,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 08:43:22,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 08:43:22,191 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 08:43:22,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:22,191 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 08:43:22,191 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 08:43:22,192 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 08:43:22,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 08:43:22,192 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:22,192 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 08:43:22,192 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:22,193 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 08:43:22,193 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:22,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,194 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:22,194 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,194 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:22,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:22,203 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:22,237 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 08:43:22,238 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 08:43:22,238 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 08:43:22,238 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:43:22,240 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 08:43:22,240 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 08:43:22,240 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:43:22,241 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 08:43:22,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:22,303 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 08:43:22,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 08:43:22,303 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 08:43:22,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:22,306 INFO L225 Difference]: With dead ends: 66 [2018-01-21 08:43:22,306 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 08:43:22,307 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 08:43:22,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 08:43:22,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 08:43:22,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 08:43:22,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 08:43:22,320 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 08:43:22,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:22,320 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 08:43:22,320 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 08:43:22,321 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 08:43:22,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 08:43:22,322 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:22,322 INFO L322 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:22,322 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:22,322 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 08:43:22,322 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:22,323 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,323 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:22,323 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:22,324 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:22,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:22,344 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:22,393 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:43:22,393 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:22,394 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:22,394 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 08:43:22,396 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:43:22,440 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:43:22,440 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:43:25,384 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:43:25,385 INFO L268 AbstractInterpreter]: Visited 30 different actions 92 times. Merged at 14 different actions 41 times. Never widened. Found 4 fixpoints after 2 different actions. Largest state had 17 variables. [2018-01-21 08:43:25,396 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:43:25,397 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:25,397 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 08:43:25,412 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:25,413 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:25,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:25,449 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:25,564 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:43:25,564 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:25,712 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:43:25,747 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 08:43:25,747 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [4] total 9 [2018-01-21 08:43:25,747 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 08:43:25,748 INFO L409 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-01-21 08:43:25,748 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-01-21 08:43:25,748 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2018-01-21 08:43:25,749 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 5 states. [2018-01-21 08:43:25,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:25,872 INFO L93 Difference]: Finished difference Result 80 states and 87 transitions. [2018-01-21 08:43:25,872 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 08:43:25,872 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2018-01-21 08:43:25,873 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:25,873 INFO L225 Difference]: With dead ends: 80 [2018-01-21 08:43:25,874 INFO L226 Difference]: Without dead ends: 46 [2018-01-21 08:43:25,874 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 56 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2018-01-21 08:43:25,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-01-21 08:43:25,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 43. [2018-01-21 08:43:25,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2018-01-21 08:43:25,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2018-01-21 08:43:25,880 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 31 [2018-01-21 08:43:25,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:25,881 INFO L432 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2018-01-21 08:43:25,881 INFO L433 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-01-21 08:43:25,881 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2018-01-21 08:43:25,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2018-01-21 08:43:25,883 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:25,883 INFO L322 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:25,883 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:25,883 INFO L82 PathProgramCache]: Analyzing trace with hash -151955344, now seen corresponding path program 1 times [2018-01-21 08:43:25,883 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:25,885 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:25,885 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:25,885 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:25,885 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:25,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:25,899 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:25,937 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:43:25,937 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:25,937 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:25,937 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 37 with the following transitions: [2018-01-21 08:43:25,938 INFO L201 CegarAbsIntRunner]: [0], [1], [3], [7], [10], [12], [13], [14], [16], [20], [21], [26], [27], [28], [29], [33], [36], [38], [40], [42], [46], [50], [55], [58], [60], [61], [62], [72], [74], [75], [76], [77], [78], [79] [2018-01-21 08:43:25,939 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 08:43:25,939 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 08:43:27,137 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 08:43:27,137 INFO L268 AbstractInterpreter]: Visited 34 different actions 115 times. Merged at 22 different actions 56 times. Never widened. Found 9 fixpoints after 4 different actions. Largest state had 21 variables. [2018-01-21 08:43:27,140 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 08:43:27,140 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:27,140 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:27,150 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:27,150 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:27,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:27,176 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:27,237 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:43:27,237 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:27,407 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 08:43:27,442 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:27,442 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:27,454 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:27,454 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:27,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:27,489 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:27,521 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:43:27,521 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:27,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-01-21 08:43:27,589 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:27,589 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6, 4, 4] total 13 [2018-01-21 08:43:27,589 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:27,589 INFO L409 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-01-21 08:43:27,590 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-01-21 08:43:27,590 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2018-01-21 08:43:27,590 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 8 states. [2018-01-21 08:43:27,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:27,780 INFO L93 Difference]: Finished difference Result 111 states and 126 transitions. [2018-01-21 08:43:27,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-01-21 08:43:27,780 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 36 [2018-01-21 08:43:27,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:27,781 INFO L225 Difference]: With dead ends: 111 [2018-01-21 08:43:27,782 INFO L226 Difference]: Without dead ends: 75 [2018-01-21 08:43:27,782 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2018-01-21 08:43:27,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-01-21 08:43:27,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 57. [2018-01-21 08:43:27,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-01-21 08:43:27,789 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 62 transitions. [2018-01-21 08:43:27,789 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 62 transitions. Word has length 36 [2018-01-21 08:43:27,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:27,789 INFO L432 AbstractCegarLoop]: Abstraction has 57 states and 62 transitions. [2018-01-21 08:43:27,789 INFO L433 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-01-21 08:43:27,789 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 62 transitions. [2018-01-21 08:43:27,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-01-21 08:43:27,791 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:27,791 INFO L322 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:27,791 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:27,791 INFO L82 PathProgramCache]: Analyzing trace with hash 936865683, now seen corresponding path program 2 times [2018-01-21 08:43:27,792 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:27,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:27,792 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:27,792 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:27,792 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:27,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:27,817 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:27,873 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:27,874 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:27,874 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:27,874 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:27,874 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:27,874 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:27,874 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:27,880 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:27,881 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:27,892 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:27,908 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:27,909 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:27,913 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:27,987 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:43:27,987 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:28,131 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 42 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 08:43:28,151 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:28,152 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:28,158 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:28,159 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:28,171 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:28,186 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:28,197 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:28,201 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:28,214 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:28,214 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:28,255 INFO L134 CoverageAnalysis]: Checked inductivity of 61 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2018-01-21 08:43:28,256 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:28,256 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 8, 8, 5, 5] total 18 [2018-01-21 08:43:28,256 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:28,257 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 08:43:28,257 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 08:43:28,257 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=235, Unknown=0, NotChecked=0, Total=306 [2018-01-21 08:43:28,257 INFO L87 Difference]: Start difference. First operand 57 states and 62 transitions. Second operand 11 states. [2018-01-21 08:43:28,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:28,476 INFO L93 Difference]: Finished difference Result 163 states and 183 transitions. [2018-01-21 08:43:28,477 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-01-21 08:43:28,477 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 62 [2018-01-21 08:43:28,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:28,478 INFO L225 Difference]: With dead ends: 163 [2018-01-21 08:43:28,479 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 08:43:28,479 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 231 SyntacticMatches, 4 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 116 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2018-01-21 08:43:28,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 08:43:28,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 87. [2018-01-21 08:43:28,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2018-01-21 08:43:28,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 95 transitions. [2018-01-21 08:43:28,487 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 95 transitions. Word has length 62 [2018-01-21 08:43:28,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:28,487 INFO L432 AbstractCegarLoop]: Abstraction has 87 states and 95 transitions. [2018-01-21 08:43:28,487 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 08:43:28,487 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 95 transitions. [2018-01-21 08:43:28,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-01-21 08:43:28,489 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:28,489 INFO L322 BasicCegarLoop]: trace histogram [11, 8, 8, 8, 8, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:28,490 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:28,490 INFO L82 PathProgramCache]: Analyzing trace with hash -780821890, now seen corresponding path program 3 times [2018-01-21 08:43:28,490 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:28,490 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:28,491 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:28,491 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:28,491 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:28,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:28,518 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:28,597 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 08:43:28,597 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:28,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:28,598 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:28,598 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:28,598 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:28,598 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:28,607 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:28,607 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:28,622 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,627 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,633 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,641 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,643 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:28,648 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:28,679 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 08:43:28,679 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:28,771 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 08:43:28,795 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:28,804 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:28,808 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:28,808 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:28,824 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,832 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,847 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,868 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:28,879 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:28,884 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:28,896 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 08:43:28,897 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:28,951 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 206 trivial. 0 not checked. [2018-01-21 08:43:28,952 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:28,953 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 11 [2018-01-21 08:43:28,953 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:28,953 INFO L409 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-01-21 08:43:28,953 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-01-21 08:43:28,953 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:43:28,954 INFO L87 Difference]: Start difference. First operand 87 states and 95 transitions. Second operand 7 states. [2018-01-21 08:43:29,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:29,002 INFO L93 Difference]: Finished difference Result 146 states and 163 transitions. [2018-01-21 08:43:29,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 08:43:29,002 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 93 [2018-01-21 08:43:29,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:29,004 INFO L225 Difference]: With dead ends: 146 [2018-01-21 08:43:29,004 INFO L226 Difference]: Without dead ends: 121 [2018-01-21 08:43:29,005 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 376 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=55, Invalid=55, Unknown=0, NotChecked=0, Total=110 [2018-01-21 08:43:29,005 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-01-21 08:43:29,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 96. [2018-01-21 08:43:29,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 96 states. [2018-01-21 08:43:29,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 106 transitions. [2018-01-21 08:43:29,017 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 106 transitions. Word has length 93 [2018-01-21 08:43:29,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:29,017 INFO L432 AbstractCegarLoop]: Abstraction has 96 states and 106 transitions. [2018-01-21 08:43:29,017 INFO L433 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-01-21 08:43:29,018 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 106 transitions. [2018-01-21 08:43:29,020 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-01-21 08:43:29,020 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:29,020 INFO L322 BasicCegarLoop]: trace histogram [15, 11, 11, 11, 11, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:29,020 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:29,020 INFO L82 PathProgramCache]: Analyzing trace with hash -389182277, now seen corresponding path program 4 times [2018-01-21 08:43:29,020 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:29,021 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:29,021 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:29,022 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:29,022 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:29,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:29,049 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:29,127 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 399 trivial. 0 not checked. [2018-01-21 08:43:29,128 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:29,128 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:29,128 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:29,128 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:29,128 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:29,128 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:29,136 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:29,136 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:29,164 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:29,167 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:29,232 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 08:43:29,232 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:29,409 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 08:43:29,431 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:29,431 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:29,437 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:29,437 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:29,486 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:29,492 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:29,518 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 313 proven. 21 refuted. 0 times theorem prover too weak. 103 trivial. 0 not checked. [2018-01-21 08:43:29,518 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:29,767 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 141 proven. 83 refuted. 0 times theorem prover too weak. 213 trivial. 0 not checked. [2018-01-21 08:43:29,769 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:29,769 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 10, 10, 10, 10] total 19 [2018-01-21 08:43:29,769 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:29,770 INFO L409 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-01-21 08:43:29,770 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-01-21 08:43:29,770 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=267, Unknown=0, NotChecked=0, Total=342 [2018-01-21 08:43:29,771 INFO L87 Difference]: Start difference. First operand 96 states and 106 transitions. Second operand 15 states. [2018-01-21 08:43:30,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:30,233 INFO L93 Difference]: Finished difference Result 256 states and 287 transitions. [2018-01-21 08:43:30,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-01-21 08:43:30,233 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 119 [2018-01-21 08:43:30,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:30,235 INFO L225 Difference]: With dead ends: 256 [2018-01-21 08:43:30,235 INFO L226 Difference]: Without dead ends: 194 [2018-01-21 08:43:30,237 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 489 GetRequests, 454 SyntacticMatches, 10 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=151, Invalid=551, Unknown=0, NotChecked=0, Total=702 [2018-01-21 08:43:30,237 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2018-01-21 08:43:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 131. [2018-01-21 08:43:30,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2018-01-21 08:43:30,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 145 transitions. [2018-01-21 08:43:30,250 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 145 transitions. Word has length 119 [2018-01-21 08:43:30,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:30,250 INFO L432 AbstractCegarLoop]: Abstraction has 131 states and 145 transitions. [2018-01-21 08:43:30,250 INFO L433 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-01-21 08:43:30,250 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 145 transitions. [2018-01-21 08:43:30,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2018-01-21 08:43:30,252 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:30,252 INFO L322 BasicCegarLoop]: trace histogram [22, 17, 17, 17, 17, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:30,252 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:30,253 INFO L82 PathProgramCache]: Analyzing trace with hash 349526166, now seen corresponding path program 5 times [2018-01-21 08:43:30,253 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:30,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:30,254 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:30,254 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:30,254 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:30,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:30,287 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:30,414 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 910 trivial. 0 not checked. [2018-01-21 08:43:30,415 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:30,415 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:30,415 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:30,415 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:30,415 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:30,415 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:30,429 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:30,429 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:30,447 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,449 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,450 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,453 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,456 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,462 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,467 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,473 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:30,474 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:30,479 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:30,690 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 580 proven. 204 refuted. 0 times theorem prover too weak. 186 trivial. 0 not checked. [2018-01-21 08:43:30,690 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:31,061 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 245 proven. 355 refuted. 0 times theorem prover too weak. 370 trivial. 0 not checked. [2018-01-21 08:43:31,082 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:31,082 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:31,085 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:31,085 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:31,100 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,105 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,112 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,122 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,137 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,162 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,193 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,227 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:31,244 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:31,250 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:31,308 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 607 proven. 208 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2018-01-21 08:43:31,308 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:31,556 INFO L134 CoverageAnalysis]: Checked inductivity of 970 backedges. 277 proven. 376 refuted. 0 times theorem prover too weak. 317 trivial. 0 not checked. [2018-01-21 08:43:31,557 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:31,558 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 15, 15, 15, 15] total 33 [2018-01-21 08:43:31,558 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:31,558 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:43:31,558 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:43:31,559 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=902, Unknown=0, NotChecked=0, Total=1056 [2018-01-21 08:43:31,559 INFO L87 Difference]: Start difference. First operand 131 states and 145 transitions. Second operand 21 states. [2018-01-21 08:43:32,026 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:32,027 INFO L93 Difference]: Finished difference Result 307 states and 344 transitions. [2018-01-21 08:43:32,027 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-01-21 08:43:32,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 160 [2018-01-21 08:43:32,027 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:32,029 INFO L225 Difference]: With dead ends: 307 [2018-01-21 08:43:32,029 INFO L226 Difference]: Without dead ends: 233 [2018-01-21 08:43:32,030 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 668 GetRequests, 605 SyntacticMatches, 15 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 733 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=416, Invalid=2034, Unknown=0, NotChecked=0, Total=2450 [2018-01-21 08:43:32,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 233 states. [2018-01-21 08:43:32,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 233 to 171. [2018-01-21 08:43:32,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2018-01-21 08:43:32,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 190 transitions. [2018-01-21 08:43:32,044 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 190 transitions. Word has length 160 [2018-01-21 08:43:32,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:32,045 INFO L432 AbstractCegarLoop]: Abstraction has 171 states and 190 transitions. [2018-01-21 08:43:32,045 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:43:32,045 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 190 transitions. [2018-01-21 08:43:32,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 207 [2018-01-21 08:43:32,048 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:32,048 INFO L322 BasicCegarLoop]: trace histogram [30, 24, 24, 24, 24, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:32,048 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:32,049 INFO L82 PathProgramCache]: Analyzing trace with hash 896426349, now seen corresponding path program 6 times [2018-01-21 08:43:32,049 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:32,050 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:32,050 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:32,050 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:32,050 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:32,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:32,084 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:32,244 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 08:43:32,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:32,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:32,245 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:32,245 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:32,245 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:32,245 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:32,250 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:32,250 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:32,264 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,267 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,270 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,271 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,274 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,276 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,279 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,282 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,286 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,289 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,293 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,299 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,300 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:32,303 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:32,327 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 08:43:32,328 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:32,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 08:43:32,450 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:32,450 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:32,455 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:32,456 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:32,477 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,485 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,496 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,508 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,523 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,543 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,568 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,606 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,657 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,785 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:32,953 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:33,183 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:33,207 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:33,214 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:33,234 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 08:43:33,234 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:33,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1845 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 1758 trivial. 0 not checked. [2018-01-21 08:43:33,321 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:33,321 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 17 [2018-01-21 08:43:33,321 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:33,321 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 08:43:33,322 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 08:43:33,322 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:43:33,322 INFO L87 Difference]: Start difference. First operand 171 states and 190 transitions. Second operand 10 states. [2018-01-21 08:43:33,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:33,398 INFO L93 Difference]: Finished difference Result 257 states and 288 transitions. [2018-01-21 08:43:33,398 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-01-21 08:43:33,398 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 206 [2018-01-21 08:43:33,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:33,399 INFO L225 Difference]: With dead ends: 257 [2018-01-21 08:43:33,400 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 08:43:33,400 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 816 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=136, Invalid=136, Unknown=0, NotChecked=0, Total=272 [2018-01-21 08:43:33,400 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 08:43:33,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 180. [2018-01-21 08:43:33,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 180 states. [2018-01-21 08:43:33,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 180 states to 180 states and 201 transitions. [2018-01-21 08:43:33,414 INFO L78 Accepts]: Start accepts. Automaton has 180 states and 201 transitions. Word has length 206 [2018-01-21 08:43:33,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:33,415 INFO L432 AbstractCegarLoop]: Abstraction has 180 states and 201 transitions. [2018-01-21 08:43:33,415 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 08:43:33,415 INFO L276 IsEmpty]: Start isEmpty. Operand 180 states and 201 transitions. [2018-01-21 08:43:33,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2018-01-21 08:43:33,418 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:33,419 INFO L322 BasicCegarLoop]: trace histogram [36, 29, 29, 29, 29, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:33,419 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:33,419 INFO L82 PathProgramCache]: Analyzing trace with hash 927615722, now seen corresponding path program 7 times [2018-01-21 08:43:33,419 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:33,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:33,420 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:33,420 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:33,420 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:33,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:33,456 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:33,652 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 2562 trivial. 0 not checked. [2018-01-21 08:43:33,652 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:33,652 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:33,652 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:33,653 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:33,653 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:33,653 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:33,658 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:33,658 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:33,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:33,708 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:33,843 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 08:43:33,843 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:34,127 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 08:43:34,147 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:34,147 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:34,150 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:34,150 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 08:43:34,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:34,247 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:34,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 1730 proven. 60 refuted. 0 times theorem prover too weak. 891 trivial. 0 not checked. [2018-01-21 08:43:34,290 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:34,508 INFO L134 CoverageAnalysis]: Checked inductivity of 2681 backedges. 544 proven. 360 refuted. 0 times theorem prover too weak. 1777 trivial. 0 not checked. [2018-01-21 08:43:34,510 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:34,510 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 14, 14, 14, 14] total 28 [2018-01-21 08:43:34,510 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:34,511 INFO L409 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-01-21 08:43:34,511 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-01-21 08:43:34,511 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2018-01-21 08:43:34,511 INFO L87 Difference]: Start difference. First operand 180 states and 201 transitions. Second operand 22 states. [2018-01-21 08:43:34,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:34,928 INFO L93 Difference]: Finished difference Result 460 states and 516 transitions. [2018-01-21 08:43:34,928 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-01-21 08:43:34,928 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 242 [2018-01-21 08:43:34,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:34,930 INFO L225 Difference]: With dead ends: 460 [2018-01-21 08:43:34,930 INFO L226 Difference]: Without dead ends: 365 [2018-01-21 08:43:34,931 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 989 GetRequests, 936 SyntacticMatches, 14 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 506 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=316, Invalid=1324, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 08:43:34,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 365 states. [2018-01-21 08:43:34,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 365 to 225. [2018-01-21 08:43:34,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-01-21 08:43:34,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 252 transitions. [2018-01-21 08:43:34,947 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 252 transitions. Word has length 242 [2018-01-21 08:43:34,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:34,948 INFO L432 AbstractCegarLoop]: Abstraction has 225 states and 252 transitions. [2018-01-21 08:43:34,948 INFO L433 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-01-21 08:43:34,948 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 252 transitions. [2018-01-21 08:43:34,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 299 [2018-01-21 08:43:34,952 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:34,953 INFO L322 BasicCegarLoop]: trace histogram [46, 38, 38, 38, 38, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:34,953 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:34,953 INFO L82 PathProgramCache]: Analyzing trace with hash -965692109, now seen corresponding path program 8 times [2018-01-21 08:43:34,953 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:34,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:34,954 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 08:43:34,954 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:34,954 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:34,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:34,993 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:35,226 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 4291 trivial. 0 not checked. [2018-01-21 08:43:35,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:35,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:35,227 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:35,227 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:35,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:35,227 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:35,234 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:35,234 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:35,256 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:35,285 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:35,290 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:35,295 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:35,494 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 08:43:35,494 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:35,850 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 08:43:35,871 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:35,871 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:35,885 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 08:43:35,885 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:35,914 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:35,977 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:36,030 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:36,042 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:36,101 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 2748 proven. 87 refuted. 0 times theorem prover too weak. 1612 trivial. 0 not checked. [2018-01-21 08:43:36,102 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:36,305 INFO L134 CoverageAnalysis]: Checked inductivity of 4447 backedges. 868 proven. 505 refuted. 0 times theorem prover too weak. 3074 trivial. 0 not checked. [2018-01-21 08:43:36,306 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:36,306 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 16, 16, 16, 16] total 32 [2018-01-21 08:43:36,307 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:36,307 INFO L409 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-01-21 08:43:36,314 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-01-21 08:43:36,314 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=802, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:43:36,314 INFO L87 Difference]: Start difference. First operand 225 states and 252 transitions. Second operand 25 states. [2018-01-21 08:43:36,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:36,787 INFO L93 Difference]: Finished difference Result 570 states and 639 transitions. [2018-01-21 08:43:36,788 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-01-21 08:43:36,788 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 298 [2018-01-21 08:43:36,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:36,790 INFO L225 Difference]: With dead ends: 570 [2018-01-21 08:43:36,790 INFO L226 Difference]: Without dead ends: 463 [2018-01-21 08:43:36,791 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1216 GetRequests, 1155 SyntacticMatches, 16 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=405, Invalid=1757, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 08:43:36,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 463 states. [2018-01-21 08:43:36,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 463 to 275. [2018-01-21 08:43:36,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2018-01-21 08:43:36,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 309 transitions. [2018-01-21 08:43:36,807 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 309 transitions. Word has length 298 [2018-01-21 08:43:36,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:36,807 INFO L432 AbstractCegarLoop]: Abstraction has 275 states and 309 transitions. [2018-01-21 08:43:36,807 INFO L433 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-01-21 08:43:36,807 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 309 transitions. [2018-01-21 08:43:36,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 360 [2018-01-21 08:43:36,809 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:36,809 INFO L322 BasicCegarLoop]: trace histogram [57, 48, 48, 48, 48, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:36,809 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:36,809 INFO L82 PathProgramCache]: Analyzing trace with hash -1850454344, now seen corresponding path program 9 times [2018-01-21 08:43:36,810 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:36,810 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:36,810 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:36,811 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:36,811 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:36,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:36,838 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 6720 trivial. 0 not checked. [2018-01-21 08:43:37,171 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:37,171 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:37,171 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:37,171 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:37,171 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:37,171 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:37,177 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:37,177 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:37,207 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,211 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,216 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,222 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,230 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,237 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,245 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,253 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,261 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,262 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:37,269 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:37,513 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 08:43:37,514 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:37,895 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 08:43:37,927 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:37,927 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:37,934 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 08:43:37,935 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 08:43:37,979 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:37,991 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,012 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,047 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,105 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,251 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,420 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:38,660 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:39,038 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 08:43:39,073 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:39,080 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:39,146 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 08:43:39,146 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:39,359 INFO L134 CoverageAnalysis]: Checked inductivity of 6918 backedges. 1703 proven. 119 refuted. 0 times theorem prover too weak. 5096 trivial. 0 not checked. [2018-01-21 08:43:39,362 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:39,362 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13, 13, 13] total 32 [2018-01-21 08:43:39,362 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:39,362 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 08:43:39,363 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 08:43:39,363 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=728, Unknown=0, NotChecked=0, Total=992 [2018-01-21 08:43:39,363 INFO L87 Difference]: Start difference. First operand 275 states and 309 transitions. Second operand 21 states. [2018-01-21 08:43:39,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:39,750 INFO L93 Difference]: Finished difference Result 650 states and 740 transitions. [2018-01-21 08:43:39,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-01-21 08:43:39,751 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 359 [2018-01-21 08:43:39,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:39,755 INFO L225 Difference]: With dead ends: 650 [2018-01-21 08:43:39,755 INFO L226 Difference]: Without dead ends: 601 [2018-01-21 08:43:39,757 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1454 GetRequests, 1414 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 253 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=424, Invalid=1136, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:43:39,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2018-01-21 08:43:39,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 338. [2018-01-21 08:43:39,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 338 states. [2018-01-21 08:43:39,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 338 states to 338 states and 385 transitions. [2018-01-21 08:43:39,783 INFO L78 Accepts]: Start accepts. Automaton has 338 states and 385 transitions. Word has length 359 [2018-01-21 08:43:39,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:39,784 INFO L432 AbstractCegarLoop]: Abstraction has 338 states and 385 transitions. [2018-01-21 08:43:39,784 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 08:43:39,784 INFO L276 IsEmpty]: Start isEmpty. Operand 338 states and 385 transitions. [2018-01-21 08:43:39,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 426 [2018-01-21 08:43:39,786 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:39,786 INFO L322 BasicCegarLoop]: trace histogram [69, 59, 59, 59, 59, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:39,786 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:39,786 INFO L82 PathProgramCache]: Analyzing trace with hash -1164518591, now seen corresponding path program 10 times [2018-01-21 08:43:39,786 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:39,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:39,787 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:39,787 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:39,787 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:39,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:39,833 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:40,216 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 10005 trivial. 0 not checked. [2018-01-21 08:43:40,216 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:40,216 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:40,216 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:40,217 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:40,217 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:40,217 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:40,224 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:40,224 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:40,311 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:40,318 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:40,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 08:43:40,577 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:41,025 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 08:43:41,045 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:41,045 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:41,048 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 08:43:41,048 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 08:43:41,194 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:41,204 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:41,278 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 5813 proven. 156 refuted. 0 times theorem prover too weak. 4281 trivial. 0 not checked. [2018-01-21 08:43:41,279 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:41,545 INFO L134 CoverageAnalysis]: Checked inductivity of 10250 backedges. 1849 proven. 870 refuted. 0 times theorem prover too weak. 7531 trivial. 0 not checked. [2018-01-21 08:43:41,547 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:41,547 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 20, 20, 20, 20] total 40 [2018-01-21 08:43:41,547 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:41,548 INFO L409 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-01-21 08:43:41,548 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-01-21 08:43:41,549 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=287, Invalid=1273, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 08:43:41,549 INFO L87 Difference]: Start difference. First operand 338 states and 385 transitions. Second operand 31 states. [2018-01-21 08:43:42,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:42,604 INFO L93 Difference]: Finished difference Result 858 states and 980 transitions. [2018-01-21 08:43:42,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-01-21 08:43:42,605 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 425 [2018-01-21 08:43:42,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:42,608 INFO L225 Difference]: With dead ends: 858 [2018-01-21 08:43:42,608 INFO L226 Difference]: Without dead ends: 717 [2018-01-21 08:43:42,610 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1730 GetRequests, 1653 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1127 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=616, Invalid=2806, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 08:43:42,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 717 states. [2018-01-21 08:43:42,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 717 to 398. [2018-01-21 08:43:42,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 398 states. [2018-01-21 08:43:42,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 398 states to 398 states and 451 transitions. [2018-01-21 08:43:42,631 INFO L78 Accepts]: Start accepts. Automaton has 398 states and 451 transitions. Word has length 425 [2018-01-21 08:43:42,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:42,631 INFO L432 AbstractCegarLoop]: Abstraction has 398 states and 451 transitions. [2018-01-21 08:43:42,631 INFO L433 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-01-21 08:43:42,632 INFO L276 IsEmpty]: Start isEmpty. Operand 398 states and 451 transitions. [2018-01-21 08:43:42,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 492 [2018-01-21 08:43:42,634 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:42,634 INFO L322 BasicCegarLoop]: trace histogram [81, 70, 70, 70, 70, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:42,634 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:42,634 INFO L82 PathProgramCache]: Analyzing trace with hash -153318926, now seen corresponding path program 11 times [2018-01-21 08:43:42,634 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:42,635 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:42,635 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:42,635 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:42,635 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:42,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:42,670 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:43,101 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 13945 trivial. 0 not checked. [2018-01-21 08:43:43,101 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:43,101 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:43,102 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:43,102 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:43,102 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:43,102 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:43,108 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:43,108 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:43,135 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,140 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,145 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,152 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,160 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,170 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,179 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,189 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,199 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:43,201 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:43,207 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:43,556 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 08:43:43,556 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:44,365 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 08:43:44,385 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:44,394 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:44,397 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 08:43:44,397 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 08:43:44,434 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,446 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,466 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,498 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,559 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,696 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,813 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:44,960 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:45,122 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 08:43:45,154 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:45,168 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:45,309 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 8349 proven. 679 refuted. 0 times theorem prover too weak. 5214 trivial. 0 not checked. [2018-01-21 08:43:45,309 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:45,763 INFO L134 CoverageAnalysis]: Checked inductivity of 14242 backedges. 1297 proven. 2731 refuted. 0 times theorem prover too weak. 10214 trivial. 0 not checked. [2018-01-21 08:43:45,765 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 08:43:45,766 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21, 21, 21, 21] total 44 [2018-01-21 08:43:45,766 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 08:43:45,767 INFO L409 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-01-21 08:43:45,767 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-01-21 08:43:45,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1611, Unknown=0, NotChecked=0, Total=1892 [2018-01-21 08:43:45,768 INFO L87 Difference]: Start difference. First operand 398 states and 451 transitions. Second operand 33 states. [2018-01-21 08:43:47,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 08:43:47,384 INFO L93 Difference]: Finished difference Result 969 states and 1094 transitions. [2018-01-21 08:43:47,384 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-01-21 08:43:47,384 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 491 [2018-01-21 08:43:47,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 08:43:47,388 INFO L225 Difference]: With dead ends: 969 [2018-01-21 08:43:47,388 INFO L226 Difference]: Without dead ends: 555 [2018-01-21 08:43:47,391 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2019 GetRequests, 1925 SyntacticMatches, 20 SemanticMatches, 74 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1648 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=919, Invalid=4781, Unknown=0, NotChecked=0, Total=5700 [2018-01-21 08:43:47,392 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 555 states. [2018-01-21 08:43:47,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 555 to 399. [2018-01-21 08:43:47,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 399 states. [2018-01-21 08:43:47,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 444 transitions. [2018-01-21 08:43:47,422 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 444 transitions. Word has length 491 [2018-01-21 08:43:47,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 08:43:47,423 INFO L432 AbstractCegarLoop]: Abstraction has 399 states and 444 transitions. [2018-01-21 08:43:47,423 INFO L433 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-01-21 08:43:47,423 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 444 transitions. [2018-01-21 08:43:47,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 553 [2018-01-21 08:43:47,428 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 08:43:47,428 INFO L322 BasicCegarLoop]: trace histogram [92, 80, 80, 80, 80, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 08:43:47,428 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 08:43:47,428 INFO L82 PathProgramCache]: Analyzing trace with hash 1811475687, now seen corresponding path program 12 times [2018-01-21 08:43:47,429 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 08:43:47,429 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:47,429 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 08:43:47,430 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 08:43:47,430 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 08:43:47,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 08:43:47,483 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 08:43:48,025 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 18116 trivial. 0 not checked. [2018-01-21 08:43:48,025 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:48,025 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 08:43:48,025 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 08:43:48,025 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 08:43:48,026 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:48,026 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 08:43:48,031 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:48,031 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:48,062 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,067 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,071 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,076 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,081 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,086 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,092 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,102 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,111 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,121 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,129 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,138 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,150 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,163 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,176 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,186 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,197 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,211 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,228 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,241 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,255 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:48,257 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 08:43:48,266 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 08:43:48,522 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 08:43:48,522 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 08:43:48,754 WARN L143 SmtUtils]: Spent 111ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 08:43:48,895 WARN L143 SmtUtils]: Spent 140ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 08:43:49,033 WARN L143 SmtUtils]: Spent 137ms on a formula simplification that was a NOOP. DAG size: 40 [2018-01-21 08:43:49,153 WARN L143 SmtUtils]: Spent 120ms on a formula simplification that was a NOOP. DAG size: 40 [2018-01-21 08:43:49,569 WARN L143 SmtUtils]: Spent 125ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 08:43:49,693 WARN L143 SmtUtils]: Spent 123ms on a formula simplification that was a NOOP. DAG size: 37 [2018-01-21 08:43:50,207 INFO L134 CoverageAnalysis]: Checked inductivity of 18470 backedges. 3636 proven. 198 refuted. 0 times theorem prover too weak. 14636 trivial. 0 not checked. [2018-01-21 08:43:50,227 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 08:43:50,228 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 08:43:50,230 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 08:43:50,231 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 08:43:50,267 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:50,277 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:50,302 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:50,333 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:50,393 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:50,495 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:43:51,171 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 08:44:01,987 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown