java -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data ./data --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf -i ../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-2f49842 [2018-01-21 06:05:40,032 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-01-21 06:05:40,033 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-01-21 06:05:40,048 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-01-21 06:05:40,048 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-01-21 06:05:40,049 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-01-21 06:05:40,051 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-01-21 06:05:40,052 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-01-21 06:05:40,054 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-01-21 06:05:40,055 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-01-21 06:05:40,056 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-01-21 06:05:40,056 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-01-21 06:05:40,057 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-01-21 06:05:40,058 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-01-21 06:05:40,059 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-01-21 06:05:40,062 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-01-21 06:05:40,064 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-01-21 06:05:40,066 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-01-21 06:05:40,067 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-01-21 06:05:40,068 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-01-21 06:05:40,071 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-01-21 06:05:40,071 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-01-21 06:05:40,071 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-01-21 06:05:40,072 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-01-21 06:05:40,073 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-01-21 06:05:40,075 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-01-21 06:05:40,075 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-01-21 06:05:40,075 INFO L177 SettingsManager]: PEA to Boogie provides no preferences, ignoring... [2018-01-21 06:05:40,076 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-01-21 06:05:40,076 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-01-21 06:05:40,076 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-01-21 06:05:40,077 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/eq-bench/mempurity-32bit-Automizer_Taipan+AI_EQ_precise.epf [2018-01-21 06:05:40,085 INFO L110 SettingsManager]: Loading preferences was successful [2018-01-21 06:05:40,086 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-01-21 06:05:40,086 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-01-21 06:05:40,087 INFO L133 SettingsManager]: * to procedures, called more than once=true [2018-01-21 06:05:40,087 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-01-21 06:05:40,087 INFO L133 SettingsManager]: * Weq Fattening=true [2018-01-21 06:05:40,087 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=VPDomain [2018-01-21 06:05:40,087 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-01-21 06:05:40,087 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * sizeof long=4 [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * Check allocation purity=true [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * sizeof POINTER=4 [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-01-21 06:05:40,088 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * sizeof long double=12 [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-01-21 06:05:40,089 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-01-21 06:05:40,089 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-01-21 06:05:40,090 INFO L133 SettingsManager]: * Add additional assume for each assert=false [2018-01-21 06:05:40,090 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-01-21 06:05:40,090 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:05:40,090 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-01-21 06:05:40,090 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-01-21 06:05:40,090 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Stop after first violation was found=false [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-01-21 06:05:40,091 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-01-21 06:05:40,092 INFO L131 SettingsManager]: Preferences of IcfgTransformer differ from their defaults: [2018-01-21 06:05:40,092 INFO L133 SettingsManager]: * TransformationType=HEAP_SEPARATOR [2018-01-21 06:05:40,126 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-01-21 06:05:40,137 INFO L266 ainManager$Toolchain]: [Toolchain 1]: Parser(s) successfully initialized [2018-01-21 06:05:40,140 INFO L222 ainManager$Toolchain]: [Toolchain 1]: Toolchain data selected. [2018-01-21 06:05:40,141 INFO L271 PluginConnector]: Initializing CDTParser... [2018-01-21 06:05:40,142 INFO L276 PluginConnector]: CDTParser initialized [2018-01-21 06:05:40,142 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/ldv-memsafety/ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 06:05:40,265 INFO L304 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-01-21 06:05:40,270 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2018-01-21 06:05:40,271 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-01-21 06:05:40,271 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-01-21 06:05:40,276 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-01-21 06:05:40,277 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,280 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6abfc9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40, skipping insertion in model container [2018-01-21 06:05:40,280 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,294 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:05:40,308 INFO L153 Dispatcher]: Using SV-COMP mode [2018-01-21 06:05:40,417 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:05:40,432 INFO L450 PostProcessor]: Settings: Checked method=main [2018-01-21 06:05:40,439 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40 WrapperNode [2018-01-21 06:05:40,439 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-01-21 06:05:40,439 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-01-21 06:05:40,439 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-01-21 06:05:40,440 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-01-21 06:05:40,450 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,450 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,458 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,458 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,462 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,465 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,466 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... [2018-01-21 06:05:40,467 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-01-21 06:05:40,468 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-01-21 06:05:40,468 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-01-21 06:05:40,468 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-01-21 06:05:40,469 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-01-21 06:05:40,520 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-01-21 06:05:40,520 INFO L136 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-01-21 06:05:40,520 INFO L136 BoogieDeclarations]: Found implementation of procedure foo [2018-01-21 06:05:40,520 INFO L136 BoogieDeclarations]: Found implementation of procedure main [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure write~int [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure read~int [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.free [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure #Ultimate.alloc [2018-01-21 06:05:40,521 INFO L128 BoogieDeclarations]: Found specification of procedure foo [2018-01-21 06:05:40,522 INFO L128 BoogieDeclarations]: Found specification of procedure main [2018-01-21 06:05:40,522 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-01-21 06:05:40,522 INFO L128 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-01-21 06:05:40,675 INFO L257 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-01-21 06:05:40,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:05:40 BoogieIcfgContainer [2018-01-21 06:05:40,676 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-01-21 06:05:40,677 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-01-21 06:05:40,677 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-01-21 06:05:40,679 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-01-21 06:05:40,679 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.01 06:05:40" (1/3) ... [2018-01-21 06:05:40,680 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43b1d0a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:05:40, skipping insertion in model container [2018-01-21 06:05:40,680 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.01 06:05:40" (2/3) ... [2018-01-21 06:05:40,680 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43b1d0a5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.01 06:05:40, skipping insertion in model container [2018-01-21 06:05:40,681 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.01 06:05:40" (3/3) ... [2018-01-21 06:05:40,682 INFO L105 eAbstractionObserver]: Analyzing ICFG ArraysOfVariableLength5_true-valid-memsafety.c [2018-01-21 06:05:40,688 INFO L130 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-01-21 06:05:40,694 INFO L142 ceAbstractionStarter]: Appying trace abstraction to program that has 4 error locations. [2018-01-21 06:05:40,741 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:40,741 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:40,742 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:40,742 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:40,742 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:40,742 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:40,742 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:40,742 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.initErr0EnsuresViolation======== [2018-01-21 06:05:40,743 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:40,763 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:40,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2018-01-21 06:05:40,769 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:40,770 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1] [2018-01-21 06:05:40,770 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.initErr0EnsuresViolation]=== [2018-01-21 06:05:40,775 INFO L82 PathProgramCache]: Analyzing trace with hash 100907, now seen corresponding path program 1 times [2018-01-21 06:05:40,778 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:40,826 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:40,826 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:40,826 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:40,826 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:40,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:05:40,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2018-01-21 06:05:40,881 INFO L381 BasicCegarLoop]: Counterexample might be feasible [2018-01-21 06:05:40,887 WARN L343 cessorBacktranslator]: Generated EnsuresSpecification ensures #valid == old(#valid); is not ensure(true) [2018-01-21 06:05:40,893 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:40,894 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:40,894 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:40,894 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:40,894 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:40,894 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:40,894 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:40,895 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == fooErr0EnsuresViolation======== [2018-01-21 06:05:40,895 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:40,897 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:40,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-01-21 06:05:40,898 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:40,899 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:40,899 INFO L371 AbstractCegarLoop]: === Iteration 1 === [fooErr0EnsuresViolation]=== [2018-01-21 06:05:40,899 INFO L82 PathProgramCache]: Analyzing trace with hash 352444009, now seen corresponding path program 1 times [2018-01-21 06:05:40,899 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:40,901 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:40,901 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:40,901 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:40,901 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:40,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:40,927 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:40,961 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:40,963 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:40,963 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:05:40,964 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:40,966 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:05:40,980 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:05:40,981 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:40,983 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:05:41,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:41,005 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:05:41,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:05:41,006 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 15 [2018-01-21 06:05:41,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:41,012 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:05:41,013 INFO L226 Difference]: Without dead ends: 0 [2018-01-21 06:05:41,016 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:41,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-01-21 06:05:41,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-01-21 06:05:41,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-01-21 06:05:41,102 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-01-21 06:05:41,103 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 15 [2018-01-21 06:05:41,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:41,103 INFO L432 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-01-21 06:05:41,103 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:05:41,103 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-01-21 06:05:41,103 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-01-21 06:05:41,105 INFO L322 AbstractCegarLoop]: Interprodecural is true [2018-01-21 06:05:41,105 INFO L323 AbstractCegarLoop]: Hoare is true [2018-01-21 06:05:41,106 INFO L324 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-01-21 06:05:41,106 INFO L325 AbstractCegarLoop]: Backedges is TWOTRACK [2018-01-21 06:05:41,106 INFO L326 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-01-21 06:05:41,106 INFO L327 AbstractCegarLoop]: Difference is false [2018-01-21 06:05:41,106 INFO L328 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-01-21 06:05:41,106 INFO L333 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == ULTIMATE.startErr0EnsuresViolation======== [2018-01-21 06:05:41,106 INFO L87 2NestedWordAutomaton]: Mode: main mode - execution starts in main procedure [2018-01-21 06:05:41,107 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2018-01-21 06:05:41,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-01-21 06:05:41,108 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:41,108 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:41,109 INFO L371 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:41,109 INFO L82 PathProgramCache]: Analyzing trace with hash -1481761889, now seen corresponding path program 1 times [2018-01-21 06:05:41,109 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:41,110 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,110 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:41,110 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,110 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:41,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:41,118 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:41,129 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:41,130 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:41,130 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-01-21 06:05:41,130 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:41,130 INFO L409 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-01-21 06:05:41,130 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-01-21 06:05:41,130 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:41,130 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 2 states. [2018-01-21 06:05:41,135 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:41,135 INFO L93 Difference]: Finished difference Result 72 states and 86 transitions. [2018-01-21 06:05:41,135 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-01-21 06:05:41,135 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 17 [2018-01-21 06:05:41,135 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:41,137 INFO L225 Difference]: With dead ends: 72 [2018-01-21 06:05:41,137 INFO L226 Difference]: Without dead ends: 37 [2018-01-21 06:05:41,137 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-01-21 06:05:41,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-01-21 06:05:41,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2018-01-21 06:05:41,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-01-21 06:05:41,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-01-21 06:05:41,147 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 17 [2018-01-21 06:05:41,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:41,147 INFO L432 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-01-21 06:05:41,147 INFO L433 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-01-21 06:05:41,147 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-01-21 06:05:41,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-01-21 06:05:41,148 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:41,148 INFO L322 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:41,148 INFO L371 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:41,148 INFO L82 PathProgramCache]: Analyzing trace with hash 499012364, now seen corresponding path program 1 times [2018-01-21 06:05:41,148 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:41,149 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,149 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:41,149 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,150 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:41,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:41,161 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:41,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:41,198 INFO L320 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-01-21 06:05:41,198 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-01-21 06:05:41,199 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:41,200 INFO L409 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-01-21 06:05:41,201 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-01-21 06:05:41,201 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:05:41,201 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 3 states. [2018-01-21 06:05:41,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:41,262 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2018-01-21 06:05:41,262 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-01-21 06:05:41,262 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 19 [2018-01-21 06:05:41,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:41,265 INFO L225 Difference]: With dead ends: 66 [2018-01-21 06:05:41,265 INFO L226 Difference]: Without dead ends: 51 [2018-01-21 06:05:41,266 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-01-21 06:05:41,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-01-21 06:05:41,277 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 41. [2018-01-21 06:05:41,277 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2018-01-21 06:05:41,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 44 transitions. [2018-01-21 06:05:41,279 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 44 transitions. Word has length 19 [2018-01-21 06:05:41,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:41,279 INFO L432 AbstractCegarLoop]: Abstraction has 41 states and 44 transitions. [2018-01-21 06:05:41,279 INFO L433 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-01-21 06:05:41,279 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 44 transitions. [2018-01-21 06:05:41,280 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-01-21 06:05:41,280 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:41,281 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 06:05:41,281 INFO L371 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:41,281 INFO L82 PathProgramCache]: Analyzing trace with hash 1504830404, now seen corresponding path program 1 times [2018-01-21 06:05:41,281 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:41,282 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,282 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:41,282 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:41,282 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:41,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:41,302 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:41,487 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:41,487 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:41,487 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:41,488 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 32 with the following transitions: [2018-01-21 06:05:41,489 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 06:05:41,534 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:05:41,534 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:05:45,206 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:05:45,208 INFO L268 AbstractInterpreter]: Visited 30 different actions 82 times. Merged at 14 different actions 31 times. Never widened. Found 4 fixpoints after 3 different actions. Largest state had 18 variables. [2018-01-21 06:05:45,216 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:05:45,217 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:45,217 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:45,225 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:45,226 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:45,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:45,256 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:45,308 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,309 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:45,373 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,399 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:45,399 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:45,409 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:45,409 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:45,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:45,444 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:45,450 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,450 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:45,482 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-01-21 06:05:45,483 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:45,483 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 4, 4, 4, 4] total 12 [2018-01-21 06:05:45,484 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:45,484 INFO L409 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-01-21 06:05:45,485 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-01-21 06:05:45,485 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=96, Unknown=0, NotChecked=0, Total=132 [2018-01-21 06:05:45,485 INFO L87 Difference]: Start difference. First operand 41 states and 44 transitions. Second operand 10 states. [2018-01-21 06:05:45,837 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:45,838 INFO L93 Difference]: Finished difference Result 96 states and 112 transitions. [2018-01-21 06:05:45,838 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:05:45,838 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2018-01-21 06:05:45,838 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:45,840 INFO L225 Difference]: With dead ends: 96 [2018-01-21 06:05:45,840 INFO L226 Difference]: Without dead ends: 79 [2018-01-21 06:05:45,841 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:05:45,842 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2018-01-21 06:05:45,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 50. [2018-01-21 06:05:45,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-01-21 06:05:45,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 55 transitions. [2018-01-21 06:05:45,850 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 55 transitions. Word has length 31 [2018-01-21 06:05:45,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:45,851 INFO L432 AbstractCegarLoop]: Abstraction has 50 states and 55 transitions. [2018-01-21 06:05:45,851 INFO L433 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-01-21 06:05:45,851 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 55 transitions. [2018-01-21 06:05:45,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2018-01-21 06:05:45,854 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:45,854 INFO L322 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:45,854 INFO L371 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:45,854 INFO L82 PathProgramCache]: Analyzing trace with hash 1947199059, now seen corresponding path program 2 times [2018-01-21 06:05:45,854 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:45,855 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,856 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:45,856 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:45,856 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:45,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:45,875 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:45,921 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2018-01-21 06:05:45,921 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:45,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:45,922 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:45,922 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:45,922 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:45,922 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:45,937 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:45,937 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:45,951 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:45,958 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:45,959 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:45,962 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:46,004 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 06:05:46,004 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:46,158 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-01-21 06:05:46,192 INFO L320 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-01-21 06:05:46,192 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5] total 10 [2018-01-21 06:05:46,230 INFO L252 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-01-21 06:05:46,231 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:05:46,231 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:05:46,231 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=66, Unknown=0, NotChecked=0, Total=90 [2018-01-21 06:05:46,232 INFO L87 Difference]: Start difference. First operand 50 states and 55 transitions. Second operand 6 states. [2018-01-21 06:05:46,338 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:46,338 INFO L93 Difference]: Finished difference Result 98 states and 109 transitions. [2018-01-21 06:05:46,338 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-01-21 06:05:46,339 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 42 [2018-01-21 06:05:46,339 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:46,340 INFO L225 Difference]: With dead ends: 98 [2018-01-21 06:05:46,340 INFO L226 Difference]: Without dead ends: 63 [2018-01-21 06:05:46,340 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 76 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2018-01-21 06:05:46,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2018-01-21 06:05:46,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 55. [2018-01-21 06:05:46,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2018-01-21 06:05:46,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 61 transitions. [2018-01-21 06:05:46,346 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 61 transitions. Word has length 42 [2018-01-21 06:05:46,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:46,346 INFO L432 AbstractCegarLoop]: Abstraction has 55 states and 61 transitions. [2018-01-21 06:05:46,346 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:05:46,346 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 61 transitions. [2018-01-21 06:05:46,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-01-21 06:05:46,348 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:46,348 INFO L322 BasicCegarLoop]: trace histogram [3, 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, 1, 1, 1, 1] [2018-01-21 06:05:46,348 INFO L371 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:46,348 INFO L82 PathProgramCache]: Analyzing trace with hash 84514625, now seen corresponding path program 1 times [2018-01-21 06:05:46,348 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:46,349 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:46,349 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:46,349 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:46,350 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:46,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:46,367 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:46,427 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:05:46,427 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:46,427 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:46,428 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 48 with the following transitions: [2018-01-21 06:05:46,428 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 06:05:46,429 INFO L147 AbstractInterpreter]: Using domain VPDomain [2018-01-21 06:05:46,429 INFO L101 FixpointEngine]: Starting fixpoint engine with domain VPDomain (maxUnwinding=3, maxParallelStates=2) [2018-01-21 06:05:47,835 INFO L259 AbstractInterpreter]: Some error location(s) were reachable [2018-01-21 06:05:47,835 INFO L268 AbstractInterpreter]: Visited 34 different actions 110 times. Merged at 22 different actions 51 times. Never widened. Found 9 fixpoints after 5 different actions. Largest state had 21 variables. [2018-01-21 06:05:47,844 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-01-21 06:05:47,844 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:47,844 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:47,859 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:47,859 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:47,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:47,892 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:47,944 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:05:47,944 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:48,045 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:05:48,080 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:48,080 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:48,089 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:48,089 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:48,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:48,135 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:05:48,143 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:48,187 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-01-21 06:05:48,190 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:48,190 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 9 [2018-01-21 06:05:48,190 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:48,191 INFO L409 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-01-21 06:05:48,191 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-01-21 06:05:48,191 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:05:48,191 INFO L87 Difference]: Start difference. First operand 55 states and 61 transitions. Second operand 6 states. [2018-01-21 06:05:48,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:48,284 INFO L93 Difference]: Finished difference Result 105 states and 119 transitions. [2018-01-21 06:05:48,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-01-21 06:05:48,284 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 47 [2018-01-21 06:05:48,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:48,286 INFO L225 Difference]: With dead ends: 105 [2018-01-21 06:05:48,286 INFO L226 Difference]: Without dead ends: 84 [2018-01-21 06:05:48,287 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2018-01-21 06:05:48,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-01-21 06:05:48,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 64. [2018-01-21 06:05:48,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2018-01-21 06:05:48,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 72 transitions. [2018-01-21 06:05:48,297 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 72 transitions. Word has length 47 [2018-01-21 06:05:48,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:48,297 INFO L432 AbstractCegarLoop]: Abstraction has 64 states and 72 transitions. [2018-01-21 06:05:48,297 INFO L433 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-01-21 06:05:48,297 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 72 transitions. [2018-01-21 06:05:48,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-01-21 06:05:48,299 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:48,300 INFO L322 BasicCegarLoop]: trace histogram [5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:05:48,300 INFO L371 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:48,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1267511486, now seen corresponding path program 2 times [2018-01-21 06:05:48,300 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:48,301 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:48,301 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:48,301 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:48,302 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:48,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:48,324 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:48,420 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:05:48,420 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:48,421 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:48,421 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:48,421 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:48,421 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:48,421 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:48,434 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:48,434 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:48,445 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:48,471 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:48,486 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:48,489 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:48,666 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 06:05:48,666 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:48,863 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 42 proven. 2 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2018-01-21 06:05:48,884 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:48,884 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:48,888 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:48,888 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:48,901 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:48,922 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:48,943 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:48,950 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:48,972 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:05:48,972 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:49,057 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 35 trivial. 0 not checked. [2018-01-21 06:05:49,059 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:49,059 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8, 6, 6] total 19 [2018-01-21 06:05:49,059 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:49,060 INFO L409 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-01-21 06:05:49,060 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-01-21 06:05:49,060 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=260, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:05:49,061 INFO L87 Difference]: Start difference. First operand 64 states and 72 transitions. Second operand 12 states. [2018-01-21 06:05:49,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:49,357 INFO L93 Difference]: Finished difference Result 172 states and 198 transitions. [2018-01-21 06:05:49,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-01-21 06:05:49,358 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 63 [2018-01-21 06:05:49,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:49,359 INFO L225 Difference]: With dead ends: 172 [2018-01-21 06:05:49,360 INFO L226 Difference]: Without dead ends: 128 [2018-01-21 06:05:49,360 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 234 SyntacticMatches, 5 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 131 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=129, Invalid=423, Unknown=0, NotChecked=0, Total=552 [2018-01-21 06:05:49,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2018-01-21 06:05:49,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 89. [2018-01-21 06:05:49,372 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-01-21 06:05:49,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 101 transitions. [2018-01-21 06:05:49,374 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 101 transitions. Word has length 63 [2018-01-21 06:05:49,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:49,374 INFO L432 AbstractCegarLoop]: Abstraction has 89 states and 101 transitions. [2018-01-21 06:05:49,374 INFO L433 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-01-21 06:05:49,375 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 101 transitions. [2018-01-21 06:05:49,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-01-21 06:05:49,377 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:49,377 INFO L322 BasicCegarLoop]: trace histogram [9, 5, 5, 5, 5, 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 06:05:49,377 INFO L371 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:49,377 INFO L82 PathProgramCache]: Analyzing trace with hash 86499937, now seen corresponding path program 3 times [2018-01-21 06:05:49,378 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:49,378 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:49,379 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:49,379 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:49,379 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:49,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:49,405 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:49,486 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 38 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2018-01-21 06:05:49,486 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:49,486 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:49,486 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:49,486 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:49,487 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:49,487 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:49,492 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:49,492 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:49,501 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,505 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,508 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,513 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,514 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:49,517 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:49,553 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 06:05:49,553 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:49,687 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 06:05:49,708 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:49,708 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:49,711 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:49,711 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:49,725 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,735 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,755 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,785 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:49,799 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:49,805 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:49,818 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 06:05:49,818 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:49,908 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 77 proven. 9 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2018-01-21 06:05:49,909 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:49,910 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8, 8, 8] total 17 [2018-01-21 06:05:49,910 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:49,910 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 06:05:49,910 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 06:05:49,910 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2018-01-21 06:05:49,911 INFO L87 Difference]: Start difference. First operand 89 states and 101 transitions. Second operand 11 states. [2018-01-21 06:05:50,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:50,076 INFO L93 Difference]: Finished difference Result 215 states and 249 transitions. [2018-01-21 06:05:50,077 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-01-21 06:05:50,077 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 89 [2018-01-21 06:05:50,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:50,079 INFO L225 Difference]: With dead ends: 215 [2018-01-21 06:05:50,079 INFO L226 Difference]: Without dead ends: 186 [2018-01-21 06:05:50,079 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 364 GetRequests, 344 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2018-01-21 06:05:50,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2018-01-21 06:05:50,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 127. [2018-01-21 06:05:50,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2018-01-21 06:05:50,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 147 transitions. [2018-01-21 06:05:50,094 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 147 transitions. Word has length 89 [2018-01-21 06:05:50,094 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:50,094 INFO L432 AbstractCegarLoop]: Abstraction has 127 states and 147 transitions. [2018-01-21 06:05:50,094 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 06:05:50,094 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 147 transitions. [2018-01-21 06:05:50,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2018-01-21 06:05:50,097 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:50,097 INFO L322 BasicCegarLoop]: trace histogram [14, 9, 9, 9, 9, 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 06:05:50,097 INFO L371 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:50,097 INFO L82 PathProgramCache]: Analyzing trace with hash 1835683312, now seen corresponding path program 4 times [2018-01-21 06:05:50,098 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:50,098 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:50,099 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:50,099 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:50,099 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:50,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:50,127 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:50,255 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2018-01-21 06:05:50,255 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,255 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:50,256 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:50,256 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:50,256 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,256 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:50,264 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:50,264 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:50,301 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:50,305 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:50,516 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:05:50,516 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:50,734 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:05:50,754 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:50,754 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:50,757 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:05:50,757 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:05:50,802 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:50,807 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:50,823 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:05:50,823 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:50,937 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 206 proven. 21 refuted. 0 times theorem prover too weak. 163 trivial. 0 not checked. [2018-01-21 06:05:50,939 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:50,939 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 12, 12, 12, 12] total 22 [2018-01-21 06:05:50,939 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:50,940 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:05:50,940 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:05:50,940 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:05:50,940 INFO L87 Difference]: Start difference. First operand 127 states and 147 transitions. Second operand 18 states. [2018-01-21 06:05:51,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:51,340 INFO L93 Difference]: Finished difference Result 335 states and 391 transitions. [2018-01-21 06:05:51,340 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-01-21 06:05:51,340 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 120 [2018-01-21 06:05:51,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:51,342 INFO L225 Difference]: With dead ends: 335 [2018-01-21 06:05:51,343 INFO L226 Difference]: Without dead ends: 258 [2018-01-21 06:05:51,343 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 452 SyntacticMatches, 14 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 310 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=182, Invalid=748, Unknown=0, NotChecked=0, Total=930 [2018-01-21 06:05:51,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2018-01-21 06:05:51,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 162. [2018-01-21 06:05:51,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-01-21 06:05:51,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2018-01-21 06:05:51,361 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 120 [2018-01-21 06:05:51,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:51,362 INFO L432 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2018-01-21 06:05:51,362 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:05:51,362 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2018-01-21 06:05:51,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 152 [2018-01-21 06:05:51,365 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:51,365 INFO L322 BasicCegarLoop]: trace histogram [19, 13, 13, 13, 13, 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 06:05:51,365 INFO L371 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:51,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1639693249, now seen corresponding path program 5 times [2018-01-21 06:05:51,366 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:51,367 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:51,367 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:51,367 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:51,367 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:51,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:51,401 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:51,546 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 0 proven. 87 refuted. 0 times theorem prover too weak. 636 trivial. 0 not checked. [2018-01-21 06:05:51,547 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,547 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:51,547 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:51,547 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:51,547 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:51,547 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:51,557 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:51,557 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:51,573 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,577 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,582 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,590 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,597 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,604 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:51,606 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:51,611 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:51,739 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 06:05:51,739 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:52,025 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 06:05:52,045 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,045 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:52,048 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:05:52,048 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:52,060 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,065 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,075 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,088 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,109 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,136 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:52,151 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:52,156 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:52,179 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 452 proven. 53 refuted. 0 times theorem prover too weak. 218 trivial. 0 not checked. [2018-01-21 06:05:52,179 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:52,343 INFO L134 CoverageAnalysis]: Checked inductivity of 723 backedges. 122 proven. 235 refuted. 0 times theorem prover too weak. 366 trivial. 0 not checked. [2018-01-21 06:05:52,345 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:52,345 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 11, 11, 11] total 22 [2018-01-21 06:05:52,345 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:52,346 INFO L409 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-01-21 06:05:52,346 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-01-21 06:05:52,346 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2018-01-21 06:05:52,346 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand 18 states. [2018-01-21 06:05:52,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:52,715 INFO L93 Difference]: Finished difference Result 376 states and 433 transitions. [2018-01-21 06:05:52,715 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-01-21 06:05:52,715 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 151 [2018-01-21 06:05:52,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:52,717 INFO L225 Difference]: With dead ends: 376 [2018-01-21 06:05:52,717 INFO L226 Difference]: Without dead ends: 225 [2018-01-21 06:05:52,718 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 583 SyntacticMatches, 14 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 330 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=242, Invalid=1090, Unknown=0, NotChecked=0, Total=1332 [2018-01-21 06:05:52,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2018-01-21 06:05:52,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 166. [2018-01-21 06:05:52,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-01-21 06:05:52,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 187 transitions. [2018-01-21 06:05:52,730 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 187 transitions. Word has length 151 [2018-01-21 06:05:52,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:52,730 INFO L432 AbstractCegarLoop]: Abstraction has 166 states and 187 transitions. [2018-01-21 06:05:52,730 INFO L433 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-01-21 06:05:52,730 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 187 transitions. [2018-01-21 06:05:52,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 188 [2018-01-21 06:05:52,733 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:52,733 INFO L322 BasicCegarLoop]: trace histogram [25, 18, 18, 18, 18, 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 06:05:52,734 INFO L371 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:52,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1261295644, now seen corresponding path program 6 times [2018-01-21 06:05:52,734 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:52,735 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:52,735 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:52,735 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:52,735 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:52,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:52,768 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:52,899 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:05:52,899 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,899 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:52,899 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:52,900 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:52,900 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:52,900 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:52,905 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:05:52,905 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:05:52,919 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,921 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,924 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,929 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,933 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,938 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,944 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,949 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,955 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:52,957 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:52,960 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:53,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:05:53,000 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:53,102 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:05:53,122 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:53,122 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:53,125 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:05:53,125 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:05:53,143 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,151 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,167 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,192 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,226 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,275 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,345 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,480 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,652 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:05:53,690 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:53,698 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:53,721 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:05:53,721 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:53,817 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 1143 trivial. 0 not checked. [2018-01-21 06:05:53,820 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:53,820 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 19 [2018-01-21 06:05:53,820 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:53,821 INFO L409 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-01-21 06:05:53,821 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-01-21 06:05:53,821 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:05:53,821 INFO L87 Difference]: Start difference. First operand 166 states and 187 transitions. Second operand 11 states. [2018-01-21 06:05:53,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:53,949 INFO L93 Difference]: Finished difference Result 261 states and 295 transitions. [2018-01-21 06:05:53,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-01-21 06:05:53,949 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 187 [2018-01-21 06:05:53,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:53,951 INFO L225 Difference]: With dead ends: 261 [2018-01-21 06:05:53,952 INFO L226 Difference]: Without dead ends: 220 [2018-01-21 06:05:53,952 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 739 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=171, Invalid=171, Unknown=0, NotChecked=0, Total=342 [2018-01-21 06:05:53,953 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2018-01-21 06:05:53,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 175. [2018-01-21 06:05:53,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 175 states. [2018-01-21 06:05:53,967 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 175 states to 175 states and 198 transitions. [2018-01-21 06:05:53,967 INFO L78 Accepts]: Start accepts. Automaton has 175 states and 198 transitions. Word has length 187 [2018-01-21 06:05:53,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:53,968 INFO L432 AbstractCegarLoop]: Abstraction has 175 states and 198 transitions. [2018-01-21 06:05:53,968 INFO L433 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-01-21 06:05:53,968 INFO L276 IsEmpty]: Start isEmpty. Operand 175 states and 198 transitions. [2018-01-21 06:05:53,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 219 [2018-01-21 06:05:53,971 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:53,971 INFO L322 BasicCegarLoop]: trace histogram [30, 22, 22, 22, 22, 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 06:05:53,972 INFO L371 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:53,972 INFO L82 PathProgramCache]: Analyzing trace with hash 2078734259, now seen corresponding path program 7 times [2018-01-21 06:05:53,972 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:53,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,973 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:53,973 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:53,973 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:54,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:54,005 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:54,186 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 1675 trivial. 0 not checked. [2018-01-21 06:05:54,186 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,186 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:54,186 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:54,186 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:54,187 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,187 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:54,194 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:54,194 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:54,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:54,245 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:54,472 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 06:05:54,472 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:54,719 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 06:05:54,740 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:54,740 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:54,743 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:54,743 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-01-21 06:05:54,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:54,851 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:54,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 1212 proven. 38 refuted. 0 times theorem prover too weak. 581 trivial. 0 not checked. [2018-01-21 06:05:54,880 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:55,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1831 backedges. 428 proven. 240 refuted. 0 times theorem prover too weak. 1163 trivial. 0 not checked. [2018-01-21 06:05:55,055 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:55,055 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14, 14, 14, 14] total 28 [2018-01-21 06:05:55,055 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:55,056 INFO L409 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-01-21 06:05:55,056 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-01-21 06:05:55,056 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=145, Invalid=611, Unknown=0, NotChecked=0, Total=756 [2018-01-21 06:05:55,056 INFO L87 Difference]: Start difference. First operand 175 states and 198 transitions. Second operand 23 states. [2018-01-21 06:05:55,427 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:55,428 INFO L93 Difference]: Finished difference Result 454 states and 513 transitions. [2018-01-21 06:05:55,428 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-01-21 06:05:55,428 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 218 [2018-01-21 06:05:55,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:55,430 INFO L225 Difference]: With dead ends: 454 [2018-01-21 06:05:55,430 INFO L226 Difference]: Without dead ends: 360 [2018-01-21 06:05:55,431 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 894 GetRequests, 839 SyntacticMatches, 16 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 547 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=306, Invalid=1334, Unknown=0, NotChecked=0, Total=1640 [2018-01-21 06:05:55,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 360 states. [2018-01-21 06:05:55,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 360 to 215. [2018-01-21 06:05:55,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2018-01-21 06:05:55,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 244 transitions. [2018-01-21 06:05:55,446 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 244 transitions. Word has length 218 [2018-01-21 06:05:55,446 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:55,446 INFO L432 AbstractCegarLoop]: Abstraction has 215 states and 244 transitions. [2018-01-21 06:05:55,446 INFO L433 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-01-21 06:05:55,446 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 244 transitions. [2018-01-21 06:05:55,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 270 [2018-01-21 06:05:55,448 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:55,448 INFO L322 BasicCegarLoop]: trace histogram [39, 30, 30, 30, 30, 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 06:05:55,449 INFO L371 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:55,449 INFO L82 PathProgramCache]: Analyzing trace with hash -1659522376, now seen corresponding path program 8 times [2018-01-21 06:05:55,449 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:55,450 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:55,450 INFO L101 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-01-21 06:05:55,450 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:55,450 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:55,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:55,480 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 0 proven. 198 refuted. 0 times theorem prover too weak. 2931 trivial. 0 not checked. [2018-01-21 06:05:55,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:55,727 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:55,727 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:55,727 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:55,727 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:55,727 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:55,732 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:55,732 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:55,750 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,780 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:55,786 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:55,790 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:55,958 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 06:05:55,958 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:56,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 06:05:56,240 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:56,253 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:56,256 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-01-21 06:05:56,256 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:05:56,277 INFO L201 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:56,333 INFO L214 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:05:56,378 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:56,388 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:56,441 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 1984 proven. 60 refuted. 0 times theorem prover too weak. 1085 trivial. 0 not checked. [2018-01-21 06:05:56,441 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:56,760 INFO L134 CoverageAnalysis]: Checked inductivity of 3129 backedges. 680 proven. 360 refuted. 0 times theorem prover too weak. 2089 trivial. 0 not checked. [2018-01-21 06:05:56,762 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:05:56,762 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 16, 16, 16, 16] total 32 [2018-01-21 06:05:56,763 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:05:56,766 INFO L409 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-01-21 06:05:56,766 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-01-21 06:05:56,766 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=807, Unknown=0, NotChecked=0, Total=992 [2018-01-21 06:05:56,767 INFO L87 Difference]: Start difference. First operand 215 states and 244 transitions. Second operand 26 states. [2018-01-21 06:05:57,614 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:05:57,614 INFO L93 Difference]: Finished difference Result 559 states and 631 transitions. [2018-01-21 06:05:57,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-01-21 06:05:57,615 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 269 [2018-01-21 06:05:57,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:05:57,617 INFO L225 Difference]: With dead ends: 559 [2018-01-21 06:05:57,617 INFO L226 Difference]: Without dead ends: 453 [2018-01-21 06:05:57,618 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1101 GetRequests, 1038 SyntacticMatches, 18 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 734 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=392, Invalid=1770, Unknown=0, NotChecked=0, Total=2162 [2018-01-21 06:05:57,618 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 453 states. [2018-01-21 06:05:57,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 453 to 260. [2018-01-21 06:05:57,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 260 states. [2018-01-21 06:05:57,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 260 states to 260 states and 296 transitions. [2018-01-21 06:05:57,634 INFO L78 Accepts]: Start accepts. Automaton has 260 states and 296 transitions. Word has length 269 [2018-01-21 06:05:57,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:05:57,634 INFO L432 AbstractCegarLoop]: Abstraction has 260 states and 296 transitions. [2018-01-21 06:05:57,634 INFO L433 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-01-21 06:05:57,634 INFO L276 IsEmpty]: Start isEmpty. Operand 260 states and 296 transitions. [2018-01-21 06:05:57,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-01-21 06:05:57,636 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:05:57,636 INFO L322 BasicCegarLoop]: trace histogram [49, 39, 39, 39, 39, 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 06:05:57,636 INFO L371 AbstractCegarLoop]: === Iteration 13 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:05:57,636 INFO L82 PathProgramCache]: Analyzing trace with hash 469392129, now seen corresponding path program 9 times [2018-01-21 06:05:57,636 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:05:57,637 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:57,637 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:05:57,637 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:05:57,638 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:05:57,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:05:57,665 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:05:58,020 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 0 proven. 245 refuted. 0 times theorem prover too weak. 4755 trivial. 0 not checked. [2018-01-21 06:05:58,020 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:58,020 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:05:58,020 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:05:58,020 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:05:58,021 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:58,021 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:05:58,027 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:58,027 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:58,057 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,062 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,067 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,074 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,082 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,089 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,098 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,109 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,112 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:58,119 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:58,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 06:05:58,287 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:05:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 06:05:58,635 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:05:58,635 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:05:58,638 INFO L101 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-01-21 06:05:58,638 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-01-21 06:05:58,661 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,670 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,687 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,718 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,783 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:58,959 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:59,289 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:59,878 INFO L254 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued a check-sat command [2018-01-21 06:05:59,918 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:05:59,927 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:05:59,975 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 06:05:59,976 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:00,158 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 1247 proven. 87 refuted. 0 times theorem prover too weak. 3666 trivial. 0 not checked. [2018-01-21 06:06:00,160 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:00,160 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12, 12, 12] total 31 [2018-01-21 06:06:00,160 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:00,161 INFO L409 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-01-21 06:06:00,161 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-01-21 06:06:00,162 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=243, Invalid=687, Unknown=0, NotChecked=0, Total=930 [2018-01-21 06:06:00,162 INFO L87 Difference]: Start difference. First operand 260 states and 296 transitions. Second operand 21 states. [2018-01-21 06:06:00,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:00,807 INFO L93 Difference]: Finished difference Result 639 states and 732 transitions. [2018-01-21 06:06:00,808 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-01-21 06:06:00,808 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 325 [2018-01-21 06:06:00,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:00,812 INFO L225 Difference]: With dead ends: 639 [2018-01-21 06:06:00,813 INFO L226 Difference]: Without dead ends: 586 [2018-01-21 06:06:00,814 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1318 GetRequests, 1280 SyntacticMatches, 2 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=369, Invalid=1037, Unknown=0, NotChecked=0, Total=1406 [2018-01-21 06:06:00,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 586 states. [2018-01-21 06:06:00,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 586 to 318. [2018-01-21 06:06:00,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-01-21 06:06:00,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 367 transitions. [2018-01-21 06:06:00,834 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 367 transitions. Word has length 325 [2018-01-21 06:06:00,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:00,834 INFO L432 AbstractCegarLoop]: Abstraction has 318 states and 367 transitions. [2018-01-21 06:06:00,834 INFO L433 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-01-21 06:06:00,834 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 367 transitions. [2018-01-21 06:06:00,836 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2018-01-21 06:06:00,836 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:00,837 INFO L322 BasicCegarLoop]: trace histogram [60, 49, 49, 49, 49, 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 06:06:00,837 INFO L371 AbstractCegarLoop]: === Iteration 14 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:00,837 INFO L82 PathProgramCache]: Analyzing trace with hash -1594188886, now seen corresponding path program 10 times [2018-01-21 06:06:00,837 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:00,838 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:00,838 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:00,838 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:00,838 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:00,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:00,872 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:01,154 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 0 proven. 297 refuted. 0 times theorem prover too weak. 7288 trivial. 0 not checked. [2018-01-21 06:06:01,154 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:01,154 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:01,155 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:01,155 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:01,155 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:01,155 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:01,160 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:01,160 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:01,231 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:01,271 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:01,511 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 06:06:01,511 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:01,884 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 06:06:01,903 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:01,904 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:01,906 INFO L101 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-01-21 06:06:01,906 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-01-21 06:06:02,036 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:02,051 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:02,139 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 4422 proven. 119 refuted. 0 times theorem prover too weak. 3044 trivial. 0 not checked. [2018-01-21 06:06:02,139 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:02,576 INFO L134 CoverageAnalysis]: Checked inductivity of 7585 backedges. 1472 proven. 675 refuted. 0 times theorem prover too weak. 5438 trivial. 0 not checked. [2018-01-21 06:06:02,578 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:02,578 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 20, 20, 20, 20] total 40 [2018-01-21 06:06:02,579 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:02,579 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:06:02,580 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:06:02,580 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=280, Invalid=1280, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:06:02,580 INFO L87 Difference]: Start difference. First operand 318 states and 367 transitions. Second operand 32 states. [2018-01-21 06:06:03,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:03,771 INFO L93 Difference]: Finished difference Result 837 states and 962 transitions. [2018-01-21 06:06:03,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-01-21 06:06:03,772 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 386 [2018-01-21 06:06:03,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:03,775 INFO L225 Difference]: With dead ends: 837 [2018-01-21 06:06:03,775 INFO L226 Difference]: Without dead ends: 697 [2018-01-21 06:06:03,777 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1575 GetRequests, 1496 SyntacticMatches, 22 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1189 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=597, Invalid=2825, Unknown=0, NotChecked=0, Total=3422 [2018-01-21 06:06:03,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 697 states. [2018-01-21 06:06:03,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 697 to 373. [2018-01-21 06:06:03,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 373 states. [2018-01-21 06:06:03,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 373 states to 373 states and 428 transitions. [2018-01-21 06:06:03,798 INFO L78 Accepts]: Start accepts. Automaton has 373 states and 428 transitions. Word has length 386 [2018-01-21 06:06:03,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:03,798 INFO L432 AbstractCegarLoop]: Abstraction has 373 states and 428 transitions. [2018-01-21 06:06:03,799 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:06:03,799 INFO L276 IsEmpty]: Start isEmpty. Operand 373 states and 428 transitions. [2018-01-21 06:06:03,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 448 [2018-01-21 06:06:03,802 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:03,802 INFO L322 BasicCegarLoop]: trace histogram [71, 59, 59, 59, 59, 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 06:06:03,802 INFO L371 AbstractCegarLoop]: === Iteration 15 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:03,802 INFO L82 PathProgramCache]: Analyzing trace with hash -655925471, now seen corresponding path program 11 times [2018-01-21 06:06:03,802 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:03,803 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:03,803 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:03,803 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:03,803 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:03,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:03,836 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:04,366 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 0 proven. 354 refuted. 0 times theorem prover too weak. 10367 trivial. 0 not checked. [2018-01-21 06:06:04,366 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:04,367 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:04,367 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:04,367 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:04,367 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:04,367 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:04,374 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:04,375 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:04,411 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,420 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,430 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,441 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,453 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,467 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,483 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,497 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:04,499 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:04,507 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:04,959 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 06:06:04,959 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:05,528 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 06:06:05,550 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:05,550 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:05,553 INFO L101 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-01-21 06:06:05,554 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-01-21 06:06:05,590 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:05,606 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:05,639 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:05,689 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:05,782 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:05,958 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:06,188 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:06,512 INFO L278 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued a check-sat command [2018-01-21 06:06:06,572 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:06,586 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:06,671 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 6294 proven. 313 refuted. 0 times theorem prover too weak. 4114 trivial. 0 not checked. [2018-01-21 06:06:06,671 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:07,047 INFO L134 CoverageAnalysis]: Checked inductivity of 10721 backedges. 1056 proven. 1655 refuted. 0 times theorem prover too weak. 8010 trivial. 0 not checked. [2018-01-21 06:06:07,050 INFO L320 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-01-21 06:06:07,050 INFO L335 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 19, 19, 19, 19] total 40 [2018-01-21 06:06:07,050 INFO L247 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-01-21 06:06:07,051 INFO L409 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-01-21 06:06:07,051 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-01-21 06:06:07,052 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=1305, Unknown=0, NotChecked=0, Total=1560 [2018-01-21 06:06:07,052 INFO L87 Difference]: Start difference. First operand 373 states and 428 transitions. Second operand 32 states. [2018-01-21 06:06:08,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-01-21 06:06:08,334 INFO L93 Difference]: Finished difference Result 727 states and 820 transitions. [2018-01-21 06:06:08,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-01-21 06:06:08,334 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 447 [2018-01-21 06:06:08,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-01-21 06:06:08,338 INFO L225 Difference]: With dead ends: 727 [2018-01-21 06:06:08,338 INFO L226 Difference]: Without dead ends: 575 [2018-01-21 06:06:08,341 INFO L525 BasicCegarLoop]: 0 DeclaredPredicates, 1842 GetRequests, 1753 SyntacticMatches, 22 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1373 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=773, Invalid=3919, Unknown=0, NotChecked=0, Total=4692 [2018-01-21 06:06:08,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2018-01-21 06:06:08,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 374. [2018-01-21 06:06:08,369 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 374 states. [2018-01-21 06:06:08,370 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 374 states to 374 states and 429 transitions. [2018-01-21 06:06:08,371 INFO L78 Accepts]: Start accepts. Automaton has 374 states and 429 transitions. Word has length 447 [2018-01-21 06:06:08,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-01-21 06:06:08,371 INFO L432 AbstractCegarLoop]: Abstraction has 374 states and 429 transitions. [2018-01-21 06:06:08,371 INFO L433 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-01-21 06:06:08,372 INFO L276 IsEmpty]: Start isEmpty. Operand 374 states and 429 transitions. [2018-01-21 06:06:08,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 504 [2018-01-21 06:06:08,375 INFO L314 BasicCegarLoop]: Found error trace [2018-01-21 06:06:08,376 INFO L322 BasicCegarLoop]: trace histogram [81, 68, 68, 68, 68, 14, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-01-21 06:06:08,376 INFO L371 AbstractCegarLoop]: === Iteration 16 === [ULTIMATE.startErr0EnsuresViolation]=== [2018-01-21 06:06:08,376 INFO L82 PathProgramCache]: Analyzing trace with hash 832198916, now seen corresponding path program 12 times [2018-01-21 06:06:08,376 INFO L67 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-01-21 06:06:08,377 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:08,377 INFO L99 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-01-21 06:06:08,377 INFO L117 rtionOrderModulation]: Craig nested/tree interpolation forces the following order [2018-01-21 06:06:08,377 INFO L280 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-01-21 06:06:08,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-01-21 06:06:08,431 WARN L137 erpolLogProxyWrapper]: Using partial proofs (cut at CNF-level). Set option :produce-proofs to true to get complete proofs. [2018-01-21 06:06:08,976 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 0 proven. 416 refuted. 0 times theorem prover too weak. 13626 trivial. 0 not checked. [2018-01-21 06:06:08,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:08,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-01-21 06:06:08,976 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-01-21 06:06:08,976 INFO L434 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-01-21 06:06:08,976 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:08,976 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-01-21 06:06:08,982 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:08,982 INFO L280 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:09,015 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,022 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,027 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,038 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,044 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,052 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,059 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,069 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,079 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,089 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,099 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,109 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,123 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,136 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,150 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,168 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:09,171 INFO L239 tOrderPrioritization]: Conjunction of SSA is unsat [2018-01-21 06:06:09,179 INFO L270 TraceCheckSpWp]: Computing forward predicates... [2018-01-21 06:06:09,432 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 06:06:09,432 INFO L314 TraceCheckSpWp]: Computing backward predicates... [2018-01-21 06:06:10,310 INFO L134 CoverageAnalysis]: Checked inductivity of 14042 backedges. 2206 proven. 883 refuted. 0 times theorem prover too weak. 10953 trivial. 0 not checked. [2018-01-21 06:06:10,345 INFO L308 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-01-21 06:06:10,345 INFO L187 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4 Starting monitored process 28 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 28 with cvc4 --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-01-21 06:06:10,351 INFO L101 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-01-21 06:06:10,351 INFO L280 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-01-21 06:06:10,402 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:10,422 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:10,482 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:10,569 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:10,803 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:11,217 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:14,434 INFO L310 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued a check-sat command [2018-01-21 06:06:17,677 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