java -Xss4m -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/gr2006_true-unreach-call_true-termination.c.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-71425fa [2018-07-20 21:57:47,723 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-07-20 21:57:47,725 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-07-20 21:57:47,738 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-07-20 21:57:47,739 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-07-20 21:57:47,740 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-07-20 21:57:47,741 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-07-20 21:57:47,745 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-07-20 21:57:47,746 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-07-20 21:57:47,748 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-07-20 21:57:47,749 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-07-20 21:57:47,749 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-07-20 21:57:47,750 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-07-20 21:57:47,751 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-07-20 21:57:47,755 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-07-20 21:57:47,756 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-07-20 21:57:47,757 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-07-20 21:57:47,771 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-07-20 21:57:47,773 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-07-20 21:57:47,774 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-07-20 21:57:47,775 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-07-20 21:57:47,776 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-07-20 21:57:47,778 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2018-07-20 21:57:47,795 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-07-20 21:57:47,824 INFO L110 SettingsManager]: Loading preferences was successful [2018-07-20 21:57:47,825 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-07-20 21:57:47,825 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-07-20 21:57:47,826 INFO L133 SettingsManager]: * User list type=DISABLED [2018-07-20 21:57:47,826 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-07-20 21:57:47,826 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-07-20 21:57:47,826 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-07-20 21:57:47,826 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-07-20 21:57:47,827 INFO L133 SettingsManager]: * Log string format=TERM [2018-07-20 21:57:47,827 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-07-20 21:57:47,827 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-07-20 21:57:47,827 INFO L133 SettingsManager]: * Interval Domain=false [2018-07-20 21:57:47,829 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-07-20 21:57:47,829 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-07-20 21:57:47,829 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-07-20 21:57:47,829 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-07-20 21:57:47,829 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-07-20 21:57:47,830 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-07-20 21:57:47,830 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-07-20 21:57:47,830 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-07-20 21:57:47,830 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-07-20 21:57:47,830 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-07-20 21:57:47,830 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-07-20 21:57:47,831 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-07-20 21:57:47,831 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-20 21:57:47,831 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-07-20 21:57:47,831 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-07-20 21:57:47,831 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-07-20 21:57:47,832 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-07-20 21:57:47,834 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-07-20 21:57:47,834 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-07-20 21:57:47,834 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-07-20 21:57:47,835 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-07-20 21:57:47,835 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-07-20 21:57:47,835 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-07-20 21:57:47,882 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-07-20 21:57:47,897 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-07-20 21:57:47,901 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-07-20 21:57:47,904 INFO L271 PluginConnector]: Initializing CDTParser... [2018-07-20 21:57:47,905 INFO L276 PluginConnector]: CDTParser initialized [2018-07-20 21:57:47,906 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-07-20 21:57:48,251 INFO L220 CDTParser]: Created temporary CDT project at /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/5f5651050/e400c23925654f81b764af69e0c2e1c2/FLAG1e50785b2 [2018-07-20 21:57:48,377 INFO L276 CDTParser]: Found 1 translation units. [2018-07-20 21:57:48,378 INFO L158 CDTParser]: Scanning /storage/ultimate/trunk/examples/svcomp/loop-lit/gr2006_true-unreach-call_true-termination.c.i [2018-07-20 21:57:48,389 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/5f5651050/e400c23925654f81b764af69e0c2e1c2/FLAG1e50785b2 [2018-07-20 21:57:48,412 INFO L332 CDTParser]: Successfully deleted /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/5f5651050/e400c23925654f81b764af69e0c2e1c2 [2018-07-20 21:57:48,422 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-07-20 21:57:48,428 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-07-20 21:57:48,430 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-07-20 21:57:48,430 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-07-20 21:57:48,437 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-07-20 21:57:48,438 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,441 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@285117ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48, skipping insertion in model container [2018-07-20 21:57:48,441 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,622 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-07-20 21:57:48,661 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-20 21:57:48,681 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-07-20 21:57:48,686 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-20 21:57:48,702 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48 WrapperNode [2018-07-20 21:57:48,703 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-07-20 21:57:48,704 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-07-20 21:57:48,704 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-07-20 21:57:48,704 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-07-20 21:57:48,715 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,722 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,728 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-07-20 21:57:48,729 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-07-20 21:57:48,729 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-07-20 21:57:48,729 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-07-20 21:57:48,739 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,740 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,740 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,741 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,743 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,750 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (1/1) ... [2018-07-20 21:57:48,758 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-07-20 21:57:48,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-07-20 21:57:48,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-07-20 21:57:48,759 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-07-20 21:57:48,760 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (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 [2018-07-20 21:57:48,831 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-07-20 21:57:48,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-07-20 21:57:48,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-07-20 21:57:48,832 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-07-20 21:57:48,832 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-07-20 21:57:48,832 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-07-20 21:57:48,833 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assert [2018-07-20 21:57:48,833 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assert [2018-07-20 21:57:49,198 INFO L261 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-07-20 21:57:49,206 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:57:49 BoogieIcfgContainer [2018-07-20 21:57:49,206 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-07-20 21:57:49,207 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-07-20 21:57:49,207 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-07-20 21:57:49,215 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-07-20 21:57:49,215 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:57:48" (1/3) ... [2018-07-20 21:57:49,216 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e69d67d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:57:49, skipping insertion in model container [2018-07-20 21:57:49,216 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:57:48" (2/3) ... [2018-07-20 21:57:49,217 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6e69d67d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:57:49, skipping insertion in model container [2018-07-20 21:57:49,217 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:57:49" (3/3) ... [2018-07-20 21:57:49,219 INFO L112 eAbstractionObserver]: Analyzing ICFG gr2006_true-unreach-call_true-termination.c.i [2018-07-20 21:57:49,240 INFO L132 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-07-20 21:57:49,257 INFO L144 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-07-20 21:57:49,332 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2018-07-20 21:57:49,333 INFO L373 AbstractCegarLoop]: Interprodecural is true [2018-07-20 21:57:49,334 INFO L374 AbstractCegarLoop]: Hoare is true [2018-07-20 21:57:49,334 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-07-20 21:57:49,334 INFO L376 AbstractCegarLoop]: Backedges is TWOTRACK [2018-07-20 21:57:49,334 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-07-20 21:57:49,334 INFO L378 AbstractCegarLoop]: Difference is false [2018-07-20 21:57:49,334 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-07-20 21:57:49,334 INFO L384 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-07-20 21:57:49,352 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-07-20 21:57:49,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-07-20 21:57:49,357 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:49,358 INFO L358 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:49,358 INFO L414 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:49,363 INFO L82 PathProgramCache]: Analyzing trace with hash -859010367, now seen corresponding path program 1 times [2018-07-20 21:57:49,366 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:49,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,415 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:49,415 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,416 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:49,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:49,484 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:57:49,487 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 21:57:49,487 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-07-20 21:57:49,487 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 21:57:49,490 INFO L450 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-07-20 21:57:49,502 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-07-20 21:57:49,503 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-07-20 21:57:49,506 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-07-20 21:57:49,535 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:49,536 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2018-07-20 21:57:49,536 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-07-20 21:57:49,539 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-07-20 21:57:49,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:49,557 INFO L225 Difference]: With dead ends: 33 [2018-07-20 21:57:49,557 INFO L226 Difference]: Without dead ends: 14 [2018-07-20 21:57:49,561 INFO L578 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 [2018-07-20 21:57:49,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-07-20 21:57:49,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-07-20 21:57:49,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-07-20 21:57:49,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-07-20 21:57:49,597 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-07-20 21:57:49,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:49,597 INFO L471 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-07-20 21:57:49,598 INFO L472 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-07-20 21:57:49,598 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-07-20 21:57:49,598 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-07-20 21:57:49,598 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:49,599 INFO L358 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:49,599 INFO L414 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:49,599 INFO L82 PathProgramCache]: Analyzing trace with hash 220608140, now seen corresponding path program 1 times [2018-07-20 21:57:49,599 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:49,600 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,601 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:49,601 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,601 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:49,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:49,687 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:57:49,687 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 21:57:49,687 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2018-07-20 21:57:49,687 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 21:57:49,689 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-20 21:57:49,689 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-20 21:57:49,689 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-20 21:57:49,690 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 4 states. [2018-07-20 21:57:49,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:49,742 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-07-20 21:57:49,742 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-20 21:57:49,743 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-07-20 21:57:49,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:49,743 INFO L225 Difference]: With dead ends: 24 [2018-07-20 21:57:49,743 INFO L226 Difference]: Without dead ends: 19 [2018-07-20 21:57:49,744 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2018-07-20 21:57:49,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-07-20 21:57:49,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-07-20 21:57:49,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-07-20 21:57:49,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2018-07-20 21:57:49,749 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 13 [2018-07-20 21:57:49,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:49,750 INFO L471 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2018-07-20 21:57:49,750 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-20 21:57:49,750 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2018-07-20 21:57:49,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-07-20 21:57:49,751 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:49,751 INFO L358 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:49,751 INFO L414 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:49,752 INFO L82 PathProgramCache]: Analyzing trace with hash 277866442, now seen corresponding path program 1 times [2018-07-20 21:57:49,752 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:49,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,753 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:49,753 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,753 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:49,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:49,804 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:57:49,804 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 21:57:49,805 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-07-20 21:57:49,805 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 21:57:49,805 INFO L450 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-07-20 21:57:49,805 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-07-20 21:57:49,806 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-07-20 21:57:49,806 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 3 states. [2018-07-20 21:57:49,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:49,843 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2018-07-20 21:57:49,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-07-20 21:57:49,843 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2018-07-20 21:57:49,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:49,844 INFO L225 Difference]: With dead ends: 37 [2018-07-20 21:57:49,844 INFO L226 Difference]: Without dead ends: 23 [2018-07-20 21:57:49,845 INFO L578 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 [2018-07-20 21:57:49,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2018-07-20 21:57:49,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2018-07-20 21:57:49,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-07-20 21:57:49,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2018-07-20 21:57:49,850 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 13 [2018-07-20 21:57:49,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:49,850 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2018-07-20 21:57:49,850 INFO L472 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-07-20 21:57:49,850 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2018-07-20 21:57:49,851 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-07-20 21:57:49,851 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:49,851 INFO L358 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:49,851 INFO L414 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:49,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1383636324, now seen corresponding path program 1 times [2018-07-20 21:57:49,852 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:49,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,853 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:49,853 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:49,853 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:49,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:49,926 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:49,927 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:49,927 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:49,928 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 22 with the following transitions: [2018-07-20 21:57:49,934 INFO L201 CegarAbsIntRunner]: [0], [4], [8], [14], [17], [19], [23], [25], [32], [35], [37], [43], [44], [45], [47] [2018-07-20 21:57:49,986 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-07-20 21:57:49,986 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-07-20 21:57:50,317 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-07-20 21:57:50,318 INFO L272 AbstractInterpreter]: Visited 15 different actions 79 times. Merged at 6 different actions 40 times. Widened at 1 different actions 5 times. Found 5 fixpoints after 2 different actions. Largest state had 5 variables. [2018-07-20 21:57:50,336 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-07-20 21:57:50,336 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:50,337 INFO L189 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 [2018-07-20 21:57:50,344 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:50,345 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:57:50,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:50,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:50,390 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:50,456 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,493 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:50,493 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --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 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:50,518 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:50,519 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:57:50,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:50,542 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:50,548 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,548 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:50,584 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 8 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,590 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:50,591 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-07-20 21:57:50,591 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:50,591 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-20 21:57:50,592 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-20 21:57:50,592 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-07-20 21:57:50,592 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 4 states. [2018-07-20 21:57:50,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:50,679 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2018-07-20 21:57:50,679 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-20 21:57:50,680 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 21 [2018-07-20 21:57:50,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:50,680 INFO L225 Difference]: With dead ends: 41 [2018-07-20 21:57:50,681 INFO L226 Difference]: Without dead ends: 27 [2018-07-20 21:57:50,681 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2018-07-20 21:57:50,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-07-20 21:57:50,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-07-20 21:57:50,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-07-20 21:57:50,686 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-07-20 21:57:50,687 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 21 [2018-07-20 21:57:50,687 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:50,687 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-07-20 21:57:50,687 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-20 21:57:50,687 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-07-20 21:57:50,688 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-07-20 21:57:50,688 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:50,688 INFO L358 BasicCegarLoop]: trace histogram [4, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:50,689 INFO L414 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:50,689 INFO L82 PathProgramCache]: Analyzing trace with hash -1112171374, now seen corresponding path program 2 times [2018-07-20 21:57:50,689 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:50,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:50,690 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:50,690 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:50,691 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:50,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:50,881 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,882 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:50,882 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:50,882 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:50,882 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:50,882 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:50,883 INFO L189 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 [2018-07-20 21:57:50,899 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:57:50,899 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:50,931 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:57:50,931 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:50,933 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:50,940 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:50,940 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:51,058 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,084 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,084 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:51,100 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:57:51,100 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:51,134 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:57:51,134 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:51,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:51,149 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,149 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:51,196 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 13 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,198 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:51,198 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-07-20 21:57:51,198 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:51,199 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-20 21:57:51,199 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-20 21:57:51,199 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-07-20 21:57:51,200 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-07-20 21:57:51,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:51,243 INFO L93 Difference]: Finished difference Result 45 states and 50 transitions. [2018-07-20 21:57:51,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-07-20 21:57:51,244 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 25 [2018-07-20 21:57:51,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:51,245 INFO L225 Difference]: With dead ends: 45 [2018-07-20 21:57:51,245 INFO L226 Difference]: Without dead ends: 31 [2018-07-20 21:57:51,245 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2018-07-20 21:57:51,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-07-20 21:57:51,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-07-20 21:57:51,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-07-20 21:57:51,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-07-20 21:57:51,251 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 25 [2018-07-20 21:57:51,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:51,251 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-07-20 21:57:51,251 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-20 21:57:51,251 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-07-20 21:57:51,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-07-20 21:57:51,252 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:51,252 INFO L358 BasicCegarLoop]: trace histogram [5, 5, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:51,252 INFO L414 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:51,253 INFO L82 PathProgramCache]: Analyzing trace with hash 920868032, now seen corresponding path program 3 times [2018-07-20 21:57:51,253 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:51,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:51,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:51,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:51,255 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:51,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:51,354 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,354 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,354 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:51,355 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:51,355 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:51,355 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,355 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:51,365 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:57:51,365 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:57:51,393 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-07-20 21:57:51,393 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:51,395 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:51,402 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,402 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:51,565 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,598 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,598 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:51,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:57:51,615 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:57:51,646 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-07-20 21:57:51,646 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:51,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:51,658 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,658 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:51,699 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 18 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,700 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:51,701 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-07-20 21:57:51,701 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:51,701 INFO L450 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-07-20 21:57:51,701 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-07-20 21:57:51,702 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-07-20 21:57:51,702 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 6 states. [2018-07-20 21:57:51,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:51,723 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-07-20 21:57:51,724 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-07-20 21:57:51,724 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 29 [2018-07-20 21:57:51,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:51,725 INFO L225 Difference]: With dead ends: 49 [2018-07-20 21:57:51,725 INFO L226 Difference]: Without dead ends: 35 [2018-07-20 21:57:51,726 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 120 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=45, Invalid=45, Unknown=0, NotChecked=0, Total=90 [2018-07-20 21:57:51,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2018-07-20 21:57:51,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2018-07-20 21:57:51,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-07-20 21:57:51,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2018-07-20 21:57:51,732 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2018-07-20 21:57:51,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:51,733 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2018-07-20 21:57:51,733 INFO L472 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-07-20 21:57:51,733 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2018-07-20 21:57:51,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-07-20 21:57:51,734 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:51,734 INFO L358 BasicCegarLoop]: trace histogram [6, 6, 5, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:51,734 INFO L414 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:51,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1962755566, now seen corresponding path program 4 times [2018-07-20 21:57:51,734 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:51,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:51,735 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:51,735 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:51,736 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:51,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:51,881 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,882 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,882 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:51,882 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:51,882 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:51,882 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:51,882 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:51,888 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:57:51,888 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:57:51,933 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:57:51,933 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:51,935 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:51,947 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:51,947 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:52,387 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,407 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:52,407 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:52,421 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:57:52,422 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:57:52,443 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:57:52,443 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:52,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:52,454 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,454 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:52,472 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 23 proven. 36 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,474 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:52,474 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-07-20 21:57:52,474 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:52,475 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-20 21:57:52,475 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-20 21:57:52,475 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-07-20 21:57:52,475 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 7 states. [2018-07-20 21:57:52,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:52,504 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2018-07-20 21:57:52,518 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-07-20 21:57:52,518 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 33 [2018-07-20 21:57:52,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:52,519 INFO L225 Difference]: With dead ends: 53 [2018-07-20 21:57:52,519 INFO L226 Difference]: Without dead ends: 39 [2018-07-20 21:57:52,519 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=66, Invalid=66, Unknown=0, NotChecked=0, Total=132 [2018-07-20 21:57:52,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2018-07-20 21:57:52,523 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 38. [2018-07-20 21:57:52,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-07-20 21:57:52,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2018-07-20 21:57:52,525 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 33 [2018-07-20 21:57:52,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:52,525 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2018-07-20 21:57:52,525 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-20 21:57:52,525 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2018-07-20 21:57:52,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-07-20 21:57:52,526 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:52,526 INFO L358 BasicCegarLoop]: trace histogram [7, 7, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:52,527 INFO L414 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:52,527 INFO L82 PathProgramCache]: Analyzing trace with hash 1161752604, now seen corresponding path program 5 times [2018-07-20 21:57:52,527 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:52,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:52,528 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:52,528 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:52,528 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:52,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:52,595 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,596 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:52,596 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:52,596 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:52,596 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:52,596 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:52,596 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:52,603 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:57:52,604 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:52,647 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-07-20 21:57:52,647 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:52,649 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:52,662 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,662 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:52,766 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,785 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:52,786 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:52,801 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:57:52,802 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:52,840 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2018-07-20 21:57:52,840 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:52,844 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:52,854 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,854 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:52,873 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 28 proven. 55 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:52,874 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:52,874 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-07-20 21:57:52,875 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:52,875 INFO L450 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-07-20 21:57:52,875 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-07-20 21:57:52,875 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-07-20 21:57:52,876 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 8 states. [2018-07-20 21:57:52,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:52,958 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2018-07-20 21:57:52,959 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-07-20 21:57:52,959 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 37 [2018-07-20 21:57:52,959 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:52,960 INFO L225 Difference]: With dead ends: 57 [2018-07-20 21:57:52,960 INFO L226 Difference]: Without dead ends: 43 [2018-07-20 21:57:52,961 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=91, Invalid=91, Unknown=0, NotChecked=0, Total=182 [2018-07-20 21:57:52,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-07-20 21:57:52,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-07-20 21:57:52,965 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-07-20 21:57:52,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2018-07-20 21:57:52,966 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 37 [2018-07-20 21:57:52,967 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:52,967 INFO L471 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2018-07-20 21:57:52,967 INFO L472 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-07-20 21:57:52,967 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2018-07-20 21:57:52,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-07-20 21:57:52,968 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:52,968 INFO L358 BasicCegarLoop]: trace histogram [8, 8, 7, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:52,968 INFO L414 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:52,968 INFO L82 PathProgramCache]: Analyzing trace with hash 1797509962, now seen corresponding path program 6 times [2018-07-20 21:57:52,968 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:52,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:52,969 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:52,969 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:52,969 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:52,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:53,043 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:53,043 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:53,043 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:53,044 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:53,044 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:53,044 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:53,044 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:53,050 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:57:53,051 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:57:53,069 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-07-20 21:57:53,069 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:53,072 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:53,220 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 100 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-20 21:57:53,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:53,470 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 100 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2018-07-20 21:57:53,490 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:53,491 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:53,505 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:57:53,506 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:57:53,552 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 8 check-sat command(s) [2018-07-20 21:57:53,553 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:53,557 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:53,564 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:53,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:53,700 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 33 proven. 78 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2018-07-20 21:57:53,703 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:53,703 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 27 [2018-07-20 21:57:53,703 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:53,704 INFO L450 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-07-20 21:57:53,704 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-07-20 21:57:53,704 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=505, Unknown=0, NotChecked=0, Total=702 [2018-07-20 21:57:53,705 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2018-07-20 21:57:54,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:54,068 INFO L93 Difference]: Finished difference Result 106 states and 126 transitions. [2018-07-20 21:57:54,068 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-07-20 21:57:54,068 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2018-07-20 21:57:54,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:54,070 INFO L225 Difference]: With dead ends: 106 [2018-07-20 21:57:54,070 INFO L226 Difference]: Without dead ends: 92 [2018-07-20 21:57:54,071 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 142 SyntacticMatches, 4 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 325 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=488, Invalid=1072, Unknown=0, NotChecked=0, Total=1560 [2018-07-20 21:57:54,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2018-07-20 21:57:54,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 66. [2018-07-20 21:57:54,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-07-20 21:57:54,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 73 transitions. [2018-07-20 21:57:54,080 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 73 transitions. Word has length 41 [2018-07-20 21:57:54,080 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:54,080 INFO L471 AbstractCegarLoop]: Abstraction has 66 states and 73 transitions. [2018-07-20 21:57:54,080 INFO L472 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-07-20 21:57:54,080 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 73 transitions. [2018-07-20 21:57:54,081 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-07-20 21:57:54,081 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:54,082 INFO L358 BasicCegarLoop]: trace histogram [14, 14, 13, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:54,082 INFO L414 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:54,082 INFO L82 PathProgramCache]: Analyzing trace with hash 710909332, now seen corresponding path program 7 times [2018-07-20 21:57:54,082 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:54,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:54,083 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:54,083 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:54,083 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:54,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:54,196 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,196 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:54,196 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:54,197 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:54,197 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:54,197 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:54,197 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:54,205 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:54,205 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:57:54,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:54,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:54,233 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,234 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:54,332 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,352 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:54,352 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:54,368 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:54,369 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:57:54,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:54,412 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:54,422 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,423 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:54,486 INFO L134 CoverageAnalysis]: Checked inductivity of 364 backedges. 193 proven. 105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,488 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:54,488 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-07-20 21:57:54,488 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:54,488 INFO L450 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-07-20 21:57:54,489 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-07-20 21:57:54,489 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-07-20 21:57:54,489 INFO L87 Difference]: Start difference. First operand 66 states and 73 transitions. Second operand 10 states. [2018-07-20 21:57:54,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:54,622 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-07-20 21:57:54,622 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-07-20 21:57:54,622 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 65 [2018-07-20 21:57:54,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:54,623 INFO L225 Difference]: With dead ends: 105 [2018-07-20 21:57:54,623 INFO L226 Difference]: Without dead ends: 71 [2018-07-20 21:57:54,624 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 252 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=153, Invalid=153, Unknown=0, NotChecked=0, Total=306 [2018-07-20 21:57:54,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2018-07-20 21:57:54,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 70. [2018-07-20 21:57:54,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2018-07-20 21:57:54,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 77 transitions. [2018-07-20 21:57:54,632 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 77 transitions. Word has length 65 [2018-07-20 21:57:54,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:54,632 INFO L471 AbstractCegarLoop]: Abstraction has 70 states and 77 transitions. [2018-07-20 21:57:54,633 INFO L472 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-07-20 21:57:54,633 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 77 transitions. [2018-07-20 21:57:54,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2018-07-20 21:57:54,634 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:54,634 INFO L358 BasicCegarLoop]: trace histogram [15, 15, 14, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:54,634 INFO L414 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:54,634 INFO L82 PathProgramCache]: Analyzing trace with hash -1774383166, now seen corresponding path program 8 times [2018-07-20 21:57:54,635 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:54,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:54,636 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:57:54,636 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:54,636 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:54,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:54,771 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,771 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:54,771 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:54,771 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:54,771 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:54,771 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:54,771 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:54,777 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:57:54,777 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:54,795 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:57:54,795 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:54,797 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:54,811 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:54,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:55,453 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:55,484 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:55,485 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:55,513 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:57:55,513 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:55,558 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:57:55,558 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:55,563 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:55,579 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:55,579 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:55,655 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 218 proven. 136 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:55,657 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:55,657 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-07-20 21:57:55,658 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:55,658 INFO L450 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-07-20 21:57:55,658 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-07-20 21:57:55,658 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-07-20 21:57:55,659 INFO L87 Difference]: Start difference. First operand 70 states and 77 transitions. Second operand 11 states. [2018-07-20 21:57:55,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:55,997 INFO L93 Difference]: Finished difference Result 109 states and 124 transitions. [2018-07-20 21:57:55,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-07-20 21:57:55,997 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 69 [2018-07-20 21:57:55,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:55,998 INFO L225 Difference]: With dead ends: 109 [2018-07-20 21:57:55,998 INFO L226 Difference]: Without dead ends: 75 [2018-07-20 21:57:55,999 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 267 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=190, Invalid=190, Unknown=0, NotChecked=0, Total=380 [2018-07-20 21:57:55,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2018-07-20 21:57:56,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 74. [2018-07-20 21:57:56,011 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2018-07-20 21:57:56,012 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 81 transitions. [2018-07-20 21:57:56,013 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 81 transitions. Word has length 69 [2018-07-20 21:57:56,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:56,013 INFO L471 AbstractCegarLoop]: Abstraction has 74 states and 81 transitions. [2018-07-20 21:57:56,013 INFO L472 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-07-20 21:57:56,013 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 81 transitions. [2018-07-20 21:57:56,014 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2018-07-20 21:57:56,014 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:56,015 INFO L358 BasicCegarLoop]: trace histogram [16, 16, 15, 9, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:56,015 INFO L414 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:56,015 INFO L82 PathProgramCache]: Analyzing trace with hash 345619184, now seen corresponding path program 9 times [2018-07-20 21:57:56,015 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:56,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:56,016 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:56,016 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:56,016 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:56,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:56,197 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:56,197 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:56,197 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:56,197 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:56,197 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:56,197 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:56,197 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:56,204 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:57:56,204 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:57:56,251 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-07-20 21:57:56,251 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:56,253 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:56,556 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 298 proven. 157 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2018-07-20 21:57:56,556 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:57,180 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 298 proven. 157 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2018-07-20 21:57:57,212 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:57,213 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:57,237 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:57:57,237 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:57:57,384 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-07-20 21:57:57,384 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:57,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:57,396 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:57,397 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:57,599 INFO L134 CoverageAnalysis]: Checked inductivity of 480 backedges. 243 proven. 171 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2018-07-20 21:57:57,600 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:57,601 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 34 [2018-07-20 21:57:57,601 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:57,601 INFO L450 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-07-20 21:57:57,601 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-07-20 21:57:57,602 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-07-20 21:57:57,602 INFO L87 Difference]: Start difference. First operand 74 states and 81 transitions. Second operand 22 states. [2018-07-20 21:57:57,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:57,841 INFO L93 Difference]: Finished difference Result 200 states and 239 transitions. [2018-07-20 21:57:57,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-07-20 21:57:57,842 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 73 [2018-07-20 21:57:57,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:57,844 INFO L225 Difference]: With dead ends: 200 [2018-07-20 21:57:57,844 INFO L226 Difference]: Without dead ends: 166 [2018-07-20 21:57:57,845 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 321 GetRequests, 256 SyntacticMatches, 14 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 683 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=823, Invalid=1933, Unknown=0, NotChecked=0, Total=2756 [2018-07-20 21:57:57,845 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2018-07-20 21:57:57,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 90. [2018-07-20 21:57:57,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-07-20 21:57:57,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2018-07-20 21:57:57,857 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 73 [2018-07-20 21:57:57,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:57,858 INFO L471 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2018-07-20 21:57:57,858 INFO L472 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-07-20 21:57:57,858 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2018-07-20 21:57:57,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-07-20 21:57:57,859 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:57,859 INFO L358 BasicCegarLoop]: trace histogram [20, 20, 19, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:57,860 INFO L414 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:57,860 INFO L82 PathProgramCache]: Analyzing trace with hash -350630558, now seen corresponding path program 10 times [2018-07-20 21:57:57,860 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:57,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:57,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:57,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:57,861 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:57,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:57,990 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:57,990 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:57,991 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:57,991 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:57,991 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:57,991 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:57,991 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:57,997 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:57:57,997 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:57:58,037 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:57:58,037 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:58,040 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:58,054 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:58,316 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,341 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:58,341 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:58,357 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:57:58,358 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:57:58,418 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:57:58,418 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:58,423 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:58,445 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,446 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:58,491 INFO L134 CoverageAnalysis]: Checked inductivity of 760 backedges. 397 proven. 210 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,493 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:58,493 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-07-20 21:57:58,493 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:58,493 INFO L450 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-07-20 21:57:58,494 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-07-20 21:57:58,494 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-07-20 21:57:58,494 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand 13 states. [2018-07-20 21:57:58,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:58,547 INFO L93 Difference]: Finished difference Result 141 states and 162 transitions. [2018-07-20 21:57:58,547 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-07-20 21:57:58,547 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 89 [2018-07-20 21:57:58,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:58,548 INFO L225 Difference]: With dead ends: 141 [2018-07-20 21:57:58,548 INFO L226 Difference]: Without dead ends: 95 [2018-07-20 21:57:58,549 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 367 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=276, Invalid=276, Unknown=0, NotChecked=0, Total=552 [2018-07-20 21:57:58,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2018-07-20 21:57:58,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2018-07-20 21:57:58,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2018-07-20 21:57:58,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 104 transitions. [2018-07-20 21:57:58,560 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 104 transitions. Word has length 89 [2018-07-20 21:57:58,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:58,560 INFO L471 AbstractCegarLoop]: Abstraction has 94 states and 104 transitions. [2018-07-20 21:57:58,560 INFO L472 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-07-20 21:57:58,560 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 104 transitions. [2018-07-20 21:57:58,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2018-07-20 21:57:58,562 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:58,562 INFO L358 BasicCegarLoop]: trace histogram [21, 21, 20, 11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:58,562 INFO L414 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:58,562 INFO L82 PathProgramCache]: Analyzing trace with hash 317658512, now seen corresponding path program 11 times [2018-07-20 21:57:58,563 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:58,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:58,563 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:58,564 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:58,564 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:58,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:58,740 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,740 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:58,740 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:58,740 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:58,740 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:58,740 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:58,740 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:58,746 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:57:58,746 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:58,774 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-07-20 21:57:58,774 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:58,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:58,791 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:58,791 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:58,983 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,003 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:59,003 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:59,017 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:57:59,017 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:57:59,167 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 21 check-sat command(s) [2018-07-20 21:57:59,167 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:59,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:59,185 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,185 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:59,225 INFO L134 CoverageAnalysis]: Checked inductivity of 840 backedges. 434 proven. 253 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,227 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:59,227 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-07-20 21:57:59,227 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:59,227 INFO L450 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-07-20 21:57:59,227 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-07-20 21:57:59,228 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-07-20 21:57:59,228 INFO L87 Difference]: Start difference. First operand 94 states and 104 transitions. Second operand 14 states. [2018-07-20 21:57:59,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:59,260 INFO L93 Difference]: Finished difference Result 145 states and 166 transitions. [2018-07-20 21:57:59,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-07-20 21:57:59,261 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 93 [2018-07-20 21:57:59,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:59,262 INFO L225 Difference]: With dead ends: 145 [2018-07-20 21:57:59,262 INFO L226 Difference]: Without dead ends: 99 [2018-07-20 21:57:59,262 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 360 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=325, Invalid=325, Unknown=0, NotChecked=0, Total=650 [2018-07-20 21:57:59,262 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-07-20 21:57:59,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 98. [2018-07-20 21:57:59,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 98 states. [2018-07-20 21:57:59,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2018-07-20 21:57:59,272 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 93 [2018-07-20 21:57:59,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:59,273 INFO L471 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2018-07-20 21:57:59,273 INFO L472 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-07-20 21:57:59,273 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2018-07-20 21:57:59,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2018-07-20 21:57:59,275 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:59,275 INFO L358 BasicCegarLoop]: trace histogram [22, 22, 21, 12, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:59,275 INFO L414 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:59,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1097373374, now seen corresponding path program 12 times [2018-07-20 21:57:59,276 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:59,276 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:59,276 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:59,277 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:59,277 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:57:59,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:57:59,437 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,437 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:59,437 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:57:59,438 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:57:59,438 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:57:59,438 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:59,438 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:57:59,444 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:57:59,444 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:57:59,470 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-07-20 21:57:59,470 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:59,472 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:59,484 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,484 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:59,693 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,712 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:57:59,712 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:57:59,726 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:57:59,726 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:57:59,883 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 20 check-sat command(s) [2018-07-20 21:57:59,883 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:57:59,887 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:57:59,900 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,900 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:57:59,928 INFO L134 CoverageAnalysis]: Checked inductivity of 924 backedges. 471 proven. 300 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:57:59,930 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:57:59,930 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-07-20 21:57:59,930 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:57:59,930 INFO L450 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-07-20 21:57:59,931 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-07-20 21:57:59,931 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-07-20 21:57:59,931 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand 15 states. [2018-07-20 21:57:59,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:57:59,974 INFO L93 Difference]: Finished difference Result 149 states and 170 transitions. [2018-07-20 21:57:59,974 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-07-20 21:57:59,974 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 97 [2018-07-20 21:57:59,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:57:59,975 INFO L225 Difference]: With dead ends: 149 [2018-07-20 21:57:59,975 INFO L226 Difference]: Without dead ends: 103 [2018-07-20 21:57:59,975 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 375 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=378, Invalid=378, Unknown=0, NotChecked=0, Total=756 [2018-07-20 21:57:59,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2018-07-20 21:57:59,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2018-07-20 21:57:59,983 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2018-07-20 21:57:59,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 112 transitions. [2018-07-20 21:57:59,985 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 112 transitions. Word has length 97 [2018-07-20 21:57:59,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:57:59,985 INFO L471 AbstractCegarLoop]: Abstraction has 102 states and 112 transitions. [2018-07-20 21:57:59,985 INFO L472 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-07-20 21:57:59,986 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 112 transitions. [2018-07-20 21:57:59,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2018-07-20 21:57:59,987 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:57:59,987 INFO L358 BasicCegarLoop]: trace histogram [23, 23, 22, 13, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:57:59,988 INFO L414 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:57:59,988 INFO L82 PathProgramCache]: Analyzing trace with hash -1480470292, now seen corresponding path program 13 times [2018-07-20 21:57:59,988 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:57:59,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:59,989 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:57:59,989 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:57:59,989 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:00,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:00,293 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:00,294 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:00,294 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:00,294 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:00,294 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:00,294 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:00,294 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:00,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:00,301 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:00,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:00,324 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:00,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:00,354 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:00,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:00,702 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:00,702 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:00,719 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:00,719 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:00,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:00,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:00,774 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:00,774 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:00,820 INFO L134 CoverageAnalysis]: Checked inductivity of 1012 backedges. 508 proven. 351 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:00,821 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:00,821 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-07-20 21:58:00,821 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:00,822 INFO L450 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-07-20 21:58:00,822 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-07-20 21:58:00,822 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-07-20 21:58:00,822 INFO L87 Difference]: Start difference. First operand 102 states and 112 transitions. Second operand 16 states. [2018-07-20 21:58:00,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:00,953 INFO L93 Difference]: Finished difference Result 153 states and 174 transitions. [2018-07-20 21:58:00,953 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-07-20 21:58:00,953 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 101 [2018-07-20 21:58:00,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:00,954 INFO L225 Difference]: With dead ends: 153 [2018-07-20 21:58:00,954 INFO L226 Difference]: Without dead ends: 107 [2018-07-20 21:58:00,955 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 418 GetRequests, 390 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=435, Invalid=435, Unknown=0, NotChecked=0, Total=870 [2018-07-20 21:58:00,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2018-07-20 21:58:00,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 106. [2018-07-20 21:58:00,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2018-07-20 21:58:00,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 116 transitions. [2018-07-20 21:58:00,965 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 116 transitions. Word has length 101 [2018-07-20 21:58:00,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:00,965 INFO L471 AbstractCegarLoop]: Abstraction has 106 states and 116 transitions. [2018-07-20 21:58:00,965 INFO L472 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-07-20 21:58:00,965 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 116 transitions. [2018-07-20 21:58:00,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2018-07-20 21:58:00,966 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:00,966 INFO L358 BasicCegarLoop]: trace histogram [24, 24, 23, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:00,966 INFO L414 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:00,966 INFO L82 PathProgramCache]: Analyzing trace with hash 1836467226, now seen corresponding path program 14 times [2018-07-20 21:58:00,966 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:00,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:00,967 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:00,967 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:00,968 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:00,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:01,145 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:01,145 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:01,145 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:01,145 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:01,145 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:01,145 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:01,145 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:01,152 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:01,153 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:01,177 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:01,177 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:01,179 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:01,194 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:01,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:01,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:01,521 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:01,521 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:01,535 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:01,536 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:01,583 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:01,584 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:01,588 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:01,598 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:01,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:01,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1104 backedges. 545 proven. 406 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:01,657 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:01,658 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-07-20 21:58:01,658 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:01,658 INFO L450 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-07-20 21:58:01,659 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-07-20 21:58:01,659 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-07-20 21:58:01,659 INFO L87 Difference]: Start difference. First operand 106 states and 116 transitions. Second operand 17 states. [2018-07-20 21:58:01,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:01,791 INFO L93 Difference]: Finished difference Result 157 states and 178 transitions. [2018-07-20 21:58:01,791 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-07-20 21:58:01,791 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 105 [2018-07-20 21:58:01,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:01,792 INFO L225 Difference]: With dead ends: 157 [2018-07-20 21:58:01,792 INFO L226 Difference]: Without dead ends: 111 [2018-07-20 21:58:01,793 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 405 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=496, Invalid=496, Unknown=0, NotChecked=0, Total=992 [2018-07-20 21:58:01,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-07-20 21:58:01,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 110. [2018-07-20 21:58:01,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 110 states. [2018-07-20 21:58:01,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 120 transitions. [2018-07-20 21:58:01,800 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 120 transitions. Word has length 105 [2018-07-20 21:58:01,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:01,800 INFO L471 AbstractCegarLoop]: Abstraction has 110 states and 120 transitions. [2018-07-20 21:58:01,800 INFO L472 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-07-20 21:58:01,800 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 120 transitions. [2018-07-20 21:58:01,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2018-07-20 21:58:01,801 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:01,802 INFO L358 BasicCegarLoop]: trace histogram [25, 25, 24, 15, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:01,802 INFO L414 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:01,802 INFO L82 PathProgramCache]: Analyzing trace with hash -1874759608, now seen corresponding path program 15 times [2018-07-20 21:58:01,802 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:01,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:01,803 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:01,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:01,803 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:01,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:02,535 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:02,535 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:02,535 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:02,536 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:02,536 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:02,536 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:02,536 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:02,542 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:02,542 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:02,575 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-07-20 21:58:02,575 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:02,577 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:02,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:02,594 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:03,454 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:03,473 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:03,473 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:03,487 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:03,487 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:03,731 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2018-07-20 21:58:03,731 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:03,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:03,746 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:03,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:03,812 INFO L134 CoverageAnalysis]: Checked inductivity of 1200 backedges. 582 proven. 465 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:03,814 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:03,814 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-07-20 21:58:03,814 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:03,814 INFO L450 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-07-20 21:58:03,814 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-07-20 21:58:03,815 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-07-20 21:58:03,815 INFO L87 Difference]: Start difference. First operand 110 states and 120 transitions. Second operand 18 states. [2018-07-20 21:58:03,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:03,892 INFO L93 Difference]: Finished difference Result 161 states and 182 transitions. [2018-07-20 21:58:03,893 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-07-20 21:58:03,893 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 109 [2018-07-20 21:58:03,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:03,894 INFO L225 Difference]: With dead ends: 161 [2018-07-20 21:58:03,894 INFO L226 Difference]: Without dead ends: 115 [2018-07-20 21:58:03,895 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 452 GetRequests, 420 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=561, Invalid=561, Unknown=0, NotChecked=0, Total=1122 [2018-07-20 21:58:03,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 115 states. [2018-07-20 21:58:03,902 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 115 to 114. [2018-07-20 21:58:03,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 114 states. [2018-07-20 21:58:03,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 114 states to 114 states and 124 transitions. [2018-07-20 21:58:03,903 INFO L78 Accepts]: Start accepts. Automaton has 114 states and 124 transitions. Word has length 109 [2018-07-20 21:58:03,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:03,904 INFO L471 AbstractCegarLoop]: Abstraction has 114 states and 124 transitions. [2018-07-20 21:58:03,904 INFO L472 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-07-20 21:58:03,904 INFO L276 IsEmpty]: Start isEmpty. Operand 114 states and 124 transitions. [2018-07-20 21:58:03,905 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2018-07-20 21:58:03,905 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:03,905 INFO L358 BasicCegarLoop]: trace histogram [26, 26, 25, 16, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:03,905 INFO L414 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:03,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1004612234, now seen corresponding path program 16 times [2018-07-20 21:58:03,905 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:03,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:03,908 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:03,908 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:03,908 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:04,846 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:04,846 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:04,846 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:04,846 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:04,847 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:04,847 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:04,847 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:04,854 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:04,854 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:04,878 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:04,879 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:04,881 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:04,892 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:04,893 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:05,710 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:05,710 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:05,738 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:05,738 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:05,788 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:05,788 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:05,792 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:05,810 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:05,810 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:05,858 INFO L134 CoverageAnalysis]: Checked inductivity of 1300 backedges. 619 proven. 528 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:05,860 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:05,860 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-07-20 21:58:05,860 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:05,860 INFO L450 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-07-20 21:58:05,861 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-07-20 21:58:05,861 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-07-20 21:58:05,861 INFO L87 Difference]: Start difference. First operand 114 states and 124 transitions. Second operand 19 states. [2018-07-20 21:58:05,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:05,919 INFO L93 Difference]: Finished difference Result 165 states and 186 transitions. [2018-07-20 21:58:05,919 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-07-20 21:58:05,919 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 113 [2018-07-20 21:58:05,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:05,920 INFO L225 Difference]: With dead ends: 165 [2018-07-20 21:58:05,920 INFO L226 Difference]: Without dead ends: 119 [2018-07-20 21:58:05,921 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 469 GetRequests, 435 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=630, Invalid=630, Unknown=0, NotChecked=0, Total=1260 [2018-07-20 21:58:05,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2018-07-20 21:58:05,928 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 118. [2018-07-20 21:58:05,928 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2018-07-20 21:58:05,928 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2018-07-20 21:58:05,928 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 113 [2018-07-20 21:58:05,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:05,929 INFO L471 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2018-07-20 21:58:05,929 INFO L472 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-07-20 21:58:05,929 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2018-07-20 21:58:05,929 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2018-07-20 21:58:05,929 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:05,929 INFO L358 BasicCegarLoop]: trace histogram [27, 27, 26, 17, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:05,930 INFO L414 AbstractCegarLoop]: === Iteration 20 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:05,930 INFO L82 PathProgramCache]: Analyzing trace with hash 1397355428, now seen corresponding path program 17 times [2018-07-20 21:58:05,930 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:05,930 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:05,931 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:05,931 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:05,931 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:05,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:06,162 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:06,162 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:06,162 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:06,162 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:06,162 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:06,163 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:06,163 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:06,168 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:06,168 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:06,206 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2018-07-20 21:58:06,206 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:06,208 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:06,220 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:06,220 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:07,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:07,243 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:07,243 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:07,266 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:07,266 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:07,477 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 27 check-sat command(s) [2018-07-20 21:58:07,477 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:07,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:07,499 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:07,500 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:07,537 INFO L134 CoverageAnalysis]: Checked inductivity of 1404 backedges. 656 proven. 595 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:07,538 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:07,539 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-07-20 21:58:07,539 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:07,539 INFO L450 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-07-20 21:58:07,539 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-07-20 21:58:07,539 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-07-20 21:58:07,540 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand 20 states. [2018-07-20 21:58:07,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:07,592 INFO L93 Difference]: Finished difference Result 169 states and 190 transitions. [2018-07-20 21:58:07,593 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-07-20 21:58:07,593 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 117 [2018-07-20 21:58:07,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:07,594 INFO L225 Difference]: With dead ends: 169 [2018-07-20 21:58:07,594 INFO L226 Difference]: Without dead ends: 123 [2018-07-20 21:58:07,595 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 486 GetRequests, 450 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=703, Invalid=703, Unknown=0, NotChecked=0, Total=1406 [2018-07-20 21:58:07,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2018-07-20 21:58:07,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 122. [2018-07-20 21:58:07,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 122 states. [2018-07-20 21:58:07,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 132 transitions. [2018-07-20 21:58:07,604 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 132 transitions. Word has length 117 [2018-07-20 21:58:07,604 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:07,604 INFO L471 AbstractCegarLoop]: Abstraction has 122 states and 132 transitions. [2018-07-20 21:58:07,604 INFO L472 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-07-20 21:58:07,605 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 132 transitions. [2018-07-20 21:58:07,605 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2018-07-20 21:58:07,605 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:07,605 INFO L358 BasicCegarLoop]: trace histogram [28, 28, 27, 18, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:07,606 INFO L414 AbstractCegarLoop]: === Iteration 21 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:07,606 INFO L82 PathProgramCache]: Analyzing trace with hash -29472046, now seen corresponding path program 18 times [2018-07-20 21:58:07,606 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:07,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:07,607 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:07,607 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:07,607 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:07,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:07,952 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:07,952 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:07,953 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:07,953 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:07,953 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:07,953 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:07,953 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:07,959 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:07,960 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:07,999 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-07-20 21:58:07,999 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:08,002 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:08,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1132 proven. 343 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2018-07-20 21:58:08,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:08,698 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 1132 proven. 343 refuted. 0 times theorem prover too weak. 37 trivial. 0 not checked. [2018-07-20 21:58:08,718 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:08,718 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:08,735 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:08,735 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:08,996 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 28 check-sat command(s) [2018-07-20 21:58:08,996 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:09,003 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:09,023 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:09,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:09,930 INFO L134 CoverageAnalysis]: Checked inductivity of 1512 backedges. 693 proven. 666 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2018-07-20 21:58:09,931 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:09,931 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 67 [2018-07-20 21:58:09,931 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:09,932 INFO L450 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-07-20 21:58:09,932 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-07-20 21:58:09,933 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=3237, Unknown=0, NotChecked=0, Total=4422 [2018-07-20 21:58:09,933 INFO L87 Difference]: Start difference. First operand 122 states and 132 transitions. Second operand 40 states. [2018-07-20 21:58:10,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:10,511 INFO L93 Difference]: Finished difference Result 542 states and 662 transitions. [2018-07-20 21:58:10,514 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2018-07-20 21:58:10,514 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 121 [2018-07-20 21:58:10,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:10,517 INFO L225 Difference]: With dead ends: 542 [2018-07-20 21:58:10,517 INFO L226 Difference]: Without dead ends: 496 [2018-07-20 21:58:10,520 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 540 GetRequests, 418 SyntacticMatches, 20 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2825 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3052, Invalid=7660, Unknown=0, NotChecked=0, Total=10712 [2018-07-20 21:58:10,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 496 states. [2018-07-20 21:58:10,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 496 to 162. [2018-07-20 21:58:10,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2018-07-20 21:58:10,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 181 transitions. [2018-07-20 21:58:10,541 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 181 transitions. Word has length 121 [2018-07-20 21:58:10,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:10,542 INFO L471 AbstractCegarLoop]: Abstraction has 162 states and 181 transitions. [2018-07-20 21:58:10,542 INFO L472 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-07-20 21:58:10,542 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 181 transitions. [2018-07-20 21:58:10,543 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2018-07-20 21:58:10,543 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:10,543 INFO L358 BasicCegarLoop]: trace histogram [38, 38, 37, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:10,543 INFO L414 AbstractCegarLoop]: === Iteration 22 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:10,544 INFO L82 PathProgramCache]: Analyzing trace with hash -1933849908, now seen corresponding path program 19 times [2018-07-20 21:58:10,544 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:10,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:10,545 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:10,545 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:10,545 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:10,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:10,949 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:10,949 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:10,950 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:10,950 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:10,950 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:10,950 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:10,950 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:10,957 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:10,957 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:10,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:10,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:11,016 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:11,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:12,114 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:12,145 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:12,145 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:12,172 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:12,172 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:12,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:12,264 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:12,289 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:12,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:12,347 INFO L134 CoverageAnalysis]: Checked inductivity of 2812 backedges. 1441 proven. 741 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:12,348 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:12,348 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-07-20 21:58:12,349 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:12,349 INFO L450 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-07-20 21:58:12,349 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-07-20 21:58:12,350 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-07-20 21:58:12,350 INFO L87 Difference]: Start difference. First operand 162 states and 181 transitions. Second operand 22 states. [2018-07-20 21:58:12,401 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:12,401 INFO L93 Difference]: Finished difference Result 249 states and 288 transitions. [2018-07-20 21:58:12,402 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-07-20 21:58:12,402 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 161 [2018-07-20 21:58:12,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:12,403 INFO L225 Difference]: With dead ends: 249 [2018-07-20 21:58:12,403 INFO L226 Difference]: Without dead ends: 167 [2018-07-20 21:58:12,404 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 664 GetRequests, 624 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=861, Invalid=861, Unknown=0, NotChecked=0, Total=1722 [2018-07-20 21:58:12,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2018-07-20 21:58:12,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 166. [2018-07-20 21:58:12,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2018-07-20 21:58:12,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 185 transitions. [2018-07-20 21:58:12,422 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 185 transitions. Word has length 161 [2018-07-20 21:58:12,422 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:12,422 INFO L471 AbstractCegarLoop]: Abstraction has 166 states and 185 transitions. [2018-07-20 21:58:12,422 INFO L472 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-07-20 21:58:12,422 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 185 transitions. [2018-07-20 21:58:12,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2018-07-20 21:58:12,423 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:12,424 INFO L358 BasicCegarLoop]: trace histogram [39, 39, 38, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:12,424 INFO L414 AbstractCegarLoop]: === Iteration 23 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:12,424 INFO L82 PathProgramCache]: Analyzing trace with hash 78419194, now seen corresponding path program 20 times [2018-07-20 21:58:12,424 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:12,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:12,425 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:12,425 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:12,425 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:12,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:12,713 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:12,713 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:12,713 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:12,714 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:12,714 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:12,714 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:12,714 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:12,720 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:12,720 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:12,753 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:12,753 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:12,757 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:12,784 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:12,784 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:13,335 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:13,356 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:13,356 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:13,371 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:13,371 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:13,451 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:13,451 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:13,457 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:13,484 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:13,485 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:13,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2964 backedges. 1514 proven. 820 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:13,587 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:13,588 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-07-20 21:58:13,588 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:13,588 INFO L450 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-07-20 21:58:13,589 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-07-20 21:58:13,589 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-07-20 21:58:13,590 INFO L87 Difference]: Start difference. First operand 166 states and 185 transitions. Second operand 23 states. [2018-07-20 21:58:14,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:14,264 INFO L93 Difference]: Finished difference Result 253 states and 292 transitions. [2018-07-20 21:58:14,264 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-07-20 21:58:14,264 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 165 [2018-07-20 21:58:14,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:14,266 INFO L225 Difference]: With dead ends: 253 [2018-07-20 21:58:14,266 INFO L226 Difference]: Without dead ends: 171 [2018-07-20 21:58:14,267 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 681 GetRequests, 639 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=946, Invalid=946, Unknown=0, NotChecked=0, Total=1892 [2018-07-20 21:58:14,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 171 states. [2018-07-20 21:58:14,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 171 to 170. [2018-07-20 21:58:14,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2018-07-20 21:58:14,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 189 transitions. [2018-07-20 21:58:14,285 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 189 transitions. Word has length 165 [2018-07-20 21:58:14,286 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:14,286 INFO L471 AbstractCegarLoop]: Abstraction has 170 states and 189 transitions. [2018-07-20 21:58:14,286 INFO L472 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-07-20 21:58:14,286 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 189 transitions. [2018-07-20 21:58:14,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 170 [2018-07-20 21:58:14,287 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:14,287 INFO L358 BasicCegarLoop]: trace histogram [40, 40, 39, 21, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:14,287 INFO L414 AbstractCegarLoop]: === Iteration 24 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:14,287 INFO L82 PathProgramCache]: Analyzing trace with hash 632330280, now seen corresponding path program 21 times [2018-07-20 21:58:14,287 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:14,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:14,289 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:14,289 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:14,289 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:14,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:14,952 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:14,953 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:14,953 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:14,953 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:14,953 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:14,953 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:14,953 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:14,959 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:14,959 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:15,018 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-07-20 21:58:15,018 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:15,021 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:15,388 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1714 proven. 1333 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2018-07-20 21:58:15,388 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:16,136 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1714 proven. 1333 refuted. 0 times theorem prover too weak. 73 trivial. 0 not checked. [2018-07-20 21:58:16,156 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:16,157 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:16,171 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:16,171 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:16,635 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 40 check-sat command(s) [2018-07-20 21:58:16,635 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:16,640 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:16,664 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:16,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:17,435 INFO L134 CoverageAnalysis]: Checked inductivity of 3120 backedges. 1587 proven. 903 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2018-07-20 21:58:17,436 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:17,437 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 70 [2018-07-20 21:58:17,437 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:17,437 INFO L450 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-07-20 21:58:17,437 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-07-20 21:58:17,438 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=3471, Unknown=0, NotChecked=0, Total=4830 [2018-07-20 21:58:17,438 INFO L87 Difference]: Start difference. First operand 170 states and 189 transitions. Second operand 46 states. [2018-07-20 21:58:18,178 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:18,178 INFO L93 Difference]: Finished difference Result 488 states and 587 transitions. [2018-07-20 21:58:18,180 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 67 states. [2018-07-20 21:58:18,180 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 169 [2018-07-20 21:58:18,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:18,182 INFO L225 Difference]: With dead ends: 488 [2018-07-20 21:58:18,182 INFO L226 Difference]: Without dead ends: 406 [2018-07-20 21:58:18,186 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 741 GetRequests, 592 SyntacticMatches, 38 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3611 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3529, Invalid=9127, Unknown=0, NotChecked=0, Total=12656 [2018-07-20 21:58:18,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2018-07-20 21:58:18,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 186. [2018-07-20 21:58:18,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 186 states. [2018-07-20 21:58:18,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 186 states to 186 states and 208 transitions. [2018-07-20 21:58:18,223 INFO L78 Accepts]: Start accepts. Automaton has 186 states and 208 transitions. Word has length 169 [2018-07-20 21:58:18,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:18,223 INFO L471 AbstractCegarLoop]: Abstraction has 186 states and 208 transitions. [2018-07-20 21:58:18,223 INFO L472 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-07-20 21:58:18,223 INFO L276 IsEmpty]: Start isEmpty. Operand 186 states and 208 transitions. [2018-07-20 21:58:18,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 186 [2018-07-20 21:58:18,224 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:18,224 INFO L358 BasicCegarLoop]: trace histogram [44, 44, 43, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:18,225 INFO L414 AbstractCegarLoop]: === Iteration 25 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:18,225 INFO L82 PathProgramCache]: Analyzing trace with hash 762179226, now seen corresponding path program 22 times [2018-07-20 21:58:18,225 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:18,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:18,226 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:18,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:18,226 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:18,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:19,335 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:19,335 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:19,335 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:19,335 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:19,335 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:19,335 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:19,335 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:19,341 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:19,342 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:19,410 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:19,410 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:19,413 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:19,444 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:19,445 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:20,107 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:20,126 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:20,126 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:20,140 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:20,140 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:20,226 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:20,227 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:20,232 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:20,251 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:20,251 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:20,273 INFO L134 CoverageAnalysis]: Checked inductivity of 3784 backedges. 1933 proven. 990 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:20,274 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:20,275 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-07-20 21:58:20,275 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:20,275 INFO L450 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-07-20 21:58:20,275 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-07-20 21:58:20,275 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-07-20 21:58:20,276 INFO L87 Difference]: Start difference. First operand 186 states and 208 transitions. Second operand 25 states. [2018-07-20 21:58:20,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:20,357 INFO L93 Difference]: Finished difference Result 285 states and 330 transitions. [2018-07-20 21:58:20,357 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-07-20 21:58:20,357 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 185 [2018-07-20 21:58:20,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:20,359 INFO L225 Difference]: With dead ends: 285 [2018-07-20 21:58:20,359 INFO L226 Difference]: Without dead ends: 191 [2018-07-20 21:58:20,359 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 763 GetRequests, 717 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1128, Invalid=1128, Unknown=0, NotChecked=0, Total=2256 [2018-07-20 21:58:20,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2018-07-20 21:58:20,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 190. [2018-07-20 21:58:20,383 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2018-07-20 21:58:20,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 212 transitions. [2018-07-20 21:58:20,383 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 212 transitions. Word has length 185 [2018-07-20 21:58:20,384 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:20,384 INFO L471 AbstractCegarLoop]: Abstraction has 190 states and 212 transitions. [2018-07-20 21:58:20,384 INFO L472 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-07-20 21:58:20,384 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 212 transitions. [2018-07-20 21:58:20,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2018-07-20 21:58:20,384 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:20,385 INFO L358 BasicCegarLoop]: trace histogram [45, 45, 44, 23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:20,385 INFO L414 AbstractCegarLoop]: === Iteration 26 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:20,385 INFO L82 PathProgramCache]: Analyzing trace with hash -1295085880, now seen corresponding path program 23 times [2018-07-20 21:58:20,385 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:20,385 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:20,386 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:20,386 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:20,386 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:20,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:20,713 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:20,713 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:20,713 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:20,714 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:20,714 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:20,714 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:20,714 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:20,719 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:20,719 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:20,783 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 45 check-sat command(s) [2018-07-20 21:58:20,783 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:20,787 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:20,820 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:20,820 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:21,568 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:21,588 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:21,588 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:21,603 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:21,603 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:22,115 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 45 check-sat command(s) [2018-07-20 21:58:22,115 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:22,121 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:22,151 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:22,152 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:22,173 INFO L134 CoverageAnalysis]: Checked inductivity of 3960 backedges. 2018 proven. 1081 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:22,175 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:22,175 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26, 26, 26] total 50 [2018-07-20 21:58:22,175 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:22,176 INFO L450 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-07-20 21:58:22,176 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-07-20 21:58:22,176 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-07-20 21:58:22,177 INFO L87 Difference]: Start difference. First operand 190 states and 212 transitions. Second operand 26 states. [2018-07-20 21:58:22,250 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:22,250 INFO L93 Difference]: Finished difference Result 289 states and 334 transitions. [2018-07-20 21:58:22,250 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-07-20 21:58:22,250 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 189 [2018-07-20 21:58:22,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:22,252 INFO L225 Difference]: With dead ends: 289 [2018-07-20 21:58:22,252 INFO L226 Difference]: Without dead ends: 195 [2018-07-20 21:58:22,252 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 780 GetRequests, 732 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1225, Invalid=1225, Unknown=0, NotChecked=0, Total=2450 [2018-07-20 21:58:22,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2018-07-20 21:58:22,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 194. [2018-07-20 21:58:22,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 194 states. [2018-07-20 21:58:22,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 194 states to 194 states and 216 transitions. [2018-07-20 21:58:22,283 INFO L78 Accepts]: Start accepts. Automaton has 194 states and 216 transitions. Word has length 189 [2018-07-20 21:58:22,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:22,284 INFO L471 AbstractCegarLoop]: Abstraction has 194 states and 216 transitions. [2018-07-20 21:58:22,284 INFO L472 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-07-20 21:58:22,285 INFO L276 IsEmpty]: Start isEmpty. Operand 194 states and 216 transitions. [2018-07-20 21:58:22,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 194 [2018-07-20 21:58:22,286 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:22,286 INFO L358 BasicCegarLoop]: trace histogram [46, 46, 45, 24, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:22,286 INFO L414 AbstractCegarLoop]: === Iteration 27 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:22,286 INFO L82 PathProgramCache]: Analyzing trace with hash 1499949046, now seen corresponding path program 24 times [2018-07-20 21:58:22,286 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:22,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:22,287 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:22,287 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:22,288 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:22,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:22,712 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:22,712 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:22,712 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:22,713 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:22,713 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:22,713 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:22,713 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:22,718 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:22,718 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:22,789 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 44 check-sat command(s) [2018-07-20 21:58:22,789 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:22,791 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:22,811 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:22,812 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:23,624 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:23,644 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:23,644 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:23,658 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:23,658 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:24,238 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 44 check-sat command(s) [2018-07-20 21:58:24,238 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:24,244 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:24,288 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:24,289 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:24,360 INFO L134 CoverageAnalysis]: Checked inductivity of 4140 backedges. 2103 proven. 1176 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:24,362 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:24,362 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27, 27, 27] total 52 [2018-07-20 21:58:24,362 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:24,362 INFO L450 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-07-20 21:58:24,363 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-07-20 21:58:24,363 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:24,363 INFO L87 Difference]: Start difference. First operand 194 states and 216 transitions. Second operand 27 states. [2018-07-20 21:58:24,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:24,471 INFO L93 Difference]: Finished difference Result 293 states and 338 transitions. [2018-07-20 21:58:24,472 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2018-07-20 21:58:24,472 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 193 [2018-07-20 21:58:24,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:24,473 INFO L225 Difference]: With dead ends: 293 [2018-07-20 21:58:24,474 INFO L226 Difference]: Without dead ends: 199 [2018-07-20 21:58:24,474 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 797 GetRequests, 747 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:24,475 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 199 states. [2018-07-20 21:58:24,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 199 to 198. [2018-07-20 21:58:24,504 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 198 states. [2018-07-20 21:58:24,505 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 198 states to 198 states and 220 transitions. [2018-07-20 21:58:24,505 INFO L78 Accepts]: Start accepts. Automaton has 198 states and 220 transitions. Word has length 193 [2018-07-20 21:58:24,505 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:24,505 INFO L471 AbstractCegarLoop]: Abstraction has 198 states and 220 transitions. [2018-07-20 21:58:24,506 INFO L472 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-07-20 21:58:24,506 INFO L276 IsEmpty]: Start isEmpty. Operand 198 states and 220 transitions. [2018-07-20 21:58:24,507 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2018-07-20 21:58:24,507 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:24,507 INFO L358 BasicCegarLoop]: trace histogram [47, 47, 46, 25, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:24,507 INFO L414 AbstractCegarLoop]: === Iteration 28 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:24,507 INFO L82 PathProgramCache]: Analyzing trace with hash -395052508, now seen corresponding path program 25 times [2018-07-20 21:58:24,508 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:24,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:24,509 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:24,509 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:24,509 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:24,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:24,835 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:24,835 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:24,835 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:24,835 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:24,835 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:24,836 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:24,836 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:24,841 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:24,841 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:24,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:24,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:24,915 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:24,915 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:26,141 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:26,173 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:26,174 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:26,203 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:26,203 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:26,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:26,312 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:26,344 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:26,344 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:26,454 INFO L134 CoverageAnalysis]: Checked inductivity of 4324 backedges. 2188 proven. 1275 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:26,455 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:26,455 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28, 28, 28] total 52 [2018-07-20 21:58:26,455 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:26,456 INFO L450 AbstractCegarLoop]: Interpolant automaton has 28 states [2018-07-20 21:58:26,456 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2018-07-20 21:58:26,456 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:26,457 INFO L87 Difference]: Start difference. First operand 198 states and 220 transitions. Second operand 28 states. [2018-07-20 21:58:26,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:26,556 INFO L93 Difference]: Finished difference Result 297 states and 342 transitions. [2018-07-20 21:58:26,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-07-20 21:58:26,556 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 197 [2018-07-20 21:58:26,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:26,557 INFO L225 Difference]: With dead ends: 297 [2018-07-20 21:58:26,557 INFO L226 Difference]: Without dead ends: 203 [2018-07-20 21:58:26,558 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 814 GetRequests, 760 SyntacticMatches, 4 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:26,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-07-20 21:58:26,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 202. [2018-07-20 21:58:26,589 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 202 states. [2018-07-20 21:58:26,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 202 states to 202 states and 224 transitions. [2018-07-20 21:58:26,590 INFO L78 Accepts]: Start accepts. Automaton has 202 states and 224 transitions. Word has length 197 [2018-07-20 21:58:26,591 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:26,591 INFO L471 AbstractCegarLoop]: Abstraction has 202 states and 224 transitions. [2018-07-20 21:58:26,591 INFO L472 AbstractCegarLoop]: Interpolant automaton has 28 states. [2018-07-20 21:58:26,591 INFO L276 IsEmpty]: Start isEmpty. Operand 202 states and 224 transitions. [2018-07-20 21:58:26,592 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2018-07-20 21:58:26,592 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:26,592 INFO L358 BasicCegarLoop]: trace histogram [48, 48, 47, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:26,592 INFO L414 AbstractCegarLoop]: === Iteration 29 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:26,593 INFO L82 PathProgramCache]: Analyzing trace with hash 493864274, now seen corresponding path program 26 times [2018-07-20 21:58:26,593 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:26,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:26,594 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:26,594 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:26,594 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:26,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:27,721 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:27,722 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:27,722 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:27,723 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:27,723 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:27,723 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:27,723 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:27,730 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:27,730 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:27,772 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:27,772 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:27,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:27,804 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:27,805 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:28,535 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:28,555 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:28,555 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:28,568 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:28,569 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:28,658 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:28,658 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:28,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:28,693 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:28,693 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:28,801 INFO L134 CoverageAnalysis]: Checked inductivity of 4512 backedges. 2273 proven. 1378 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:28,803 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:28,803 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29, 29, 29] total 52 [2018-07-20 21:58:28,803 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:28,803 INFO L450 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-07-20 21:58:28,804 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-07-20 21:58:28,804 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:28,804 INFO L87 Difference]: Start difference. First operand 202 states and 224 transitions. Second operand 29 states. [2018-07-20 21:58:29,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:29,051 INFO L93 Difference]: Finished difference Result 301 states and 346 transitions. [2018-07-20 21:58:29,051 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-07-20 21:58:29,051 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 201 [2018-07-20 21:58:29,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:29,053 INFO L225 Difference]: With dead ends: 301 [2018-07-20 21:58:29,053 INFO L226 Difference]: Without dead ends: 207 [2018-07-20 21:58:29,054 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 773 SyntacticMatches, 8 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 196 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:29,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2018-07-20 21:58:29,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 206. [2018-07-20 21:58:29,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2018-07-20 21:58:29,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 228 transitions. [2018-07-20 21:58:29,088 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 228 transitions. Word has length 201 [2018-07-20 21:58:29,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:29,089 INFO L471 AbstractCegarLoop]: Abstraction has 206 states and 228 transitions. [2018-07-20 21:58:29,089 INFO L472 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-07-20 21:58:29,089 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 228 transitions. [2018-07-20 21:58:29,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 206 [2018-07-20 21:58:29,091 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:29,092 INFO L358 BasicCegarLoop]: trace histogram [49, 49, 48, 27, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:29,092 INFO L414 AbstractCegarLoop]: === Iteration 30 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:29,092 INFO L82 PathProgramCache]: Analyzing trace with hash -1944696448, now seen corresponding path program 27 times [2018-07-20 21:58:29,092 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:29,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:29,093 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:29,093 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:29,093 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:29,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:30,027 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:30,027 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:30,027 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:30,027 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:30,027 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:30,027 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:30,027 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:30,033 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:30,033 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:30,254 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-07-20 21:58:30,254 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:30,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:30,294 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:30,294 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:31,170 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:31,189 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:31,189 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:31,203 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:31,203 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:31,840 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 49 check-sat command(s) [2018-07-20 21:58:31,840 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:31,846 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:31,868 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:31,868 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:31,992 INFO L134 CoverageAnalysis]: Checked inductivity of 4704 backedges. 2358 proven. 1485 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:31,993 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:31,993 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30, 30, 30] total 52 [2018-07-20 21:58:31,993 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:31,994 INFO L450 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-07-20 21:58:31,994 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-07-20 21:58:31,994 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:31,995 INFO L87 Difference]: Start difference. First operand 206 states and 228 transitions. Second operand 30 states. [2018-07-20 21:58:32,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:32,078 INFO L93 Difference]: Finished difference Result 305 states and 350 transitions. [2018-07-20 21:58:32,081 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2018-07-20 21:58:32,081 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 205 [2018-07-20 21:58:32,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:32,082 INFO L225 Difference]: With dead ends: 305 [2018-07-20 21:58:32,083 INFO L226 Difference]: Without dead ends: 211 [2018-07-20 21:58:32,083 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 786 SyntacticMatches, 12 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 294 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:32,084 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2018-07-20 21:58:32,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 210. [2018-07-20 21:58:32,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 210 states. [2018-07-20 21:58:32,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 210 states to 210 states and 232 transitions. [2018-07-20 21:58:32,116 INFO L78 Accepts]: Start accepts. Automaton has 210 states and 232 transitions. Word has length 205 [2018-07-20 21:58:32,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:32,116 INFO L471 AbstractCegarLoop]: Abstraction has 210 states and 232 transitions. [2018-07-20 21:58:32,116 INFO L472 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-07-20 21:58:32,116 INFO L276 IsEmpty]: Start isEmpty. Operand 210 states and 232 transitions. [2018-07-20 21:58:32,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 210 [2018-07-20 21:58:32,118 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:32,118 INFO L358 BasicCegarLoop]: trace histogram [50, 50, 49, 28, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:32,118 INFO L414 AbstractCegarLoop]: === Iteration 31 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:32,118 INFO L82 PathProgramCache]: Analyzing trace with hash 2120418990, now seen corresponding path program 28 times [2018-07-20 21:58:32,118 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:32,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:32,119 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:32,119 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:32,119 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:32,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:33,098 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:33,098 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:33,099 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:33,099 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:33,099 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:33,099 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:33,099 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:33,104 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:33,104 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:33,174 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:33,174 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:33,178 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:33,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:33,217 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:34,377 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:34,396 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:34,396 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:34,410 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:34,410 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:34,496 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:34,497 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:34,502 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:34,527 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:34,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:34,683 INFO L134 CoverageAnalysis]: Checked inductivity of 4900 backedges. 2443 proven. 1596 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:34,684 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:34,684 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31, 31, 31] total 52 [2018-07-20 21:58:34,685 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:34,685 INFO L450 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-07-20 21:58:34,685 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-07-20 21:58:34,685 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:34,685 INFO L87 Difference]: Start difference. First operand 210 states and 232 transitions. Second operand 31 states. [2018-07-20 21:58:34,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:34,760 INFO L93 Difference]: Finished difference Result 309 states and 354 transitions. [2018-07-20 21:58:34,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2018-07-20 21:58:34,767 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 209 [2018-07-20 21:58:34,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:34,769 INFO L225 Difference]: With dead ends: 309 [2018-07-20 21:58:34,769 INFO L226 Difference]: Without dead ends: 215 [2018-07-20 21:58:34,770 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 799 SyntacticMatches, 16 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 392 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:34,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 215 states. [2018-07-20 21:58:34,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 215 to 214. [2018-07-20 21:58:34,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2018-07-20 21:58:34,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 236 transitions. [2018-07-20 21:58:34,800 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 236 transitions. Word has length 209 [2018-07-20 21:58:34,800 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:34,800 INFO L471 AbstractCegarLoop]: Abstraction has 214 states and 236 transitions. [2018-07-20 21:58:34,801 INFO L472 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-07-20 21:58:34,801 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 236 transitions. [2018-07-20 21:58:34,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 214 [2018-07-20 21:58:34,802 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:34,802 INFO L358 BasicCegarLoop]: trace histogram [51, 51, 50, 29, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:34,802 INFO L414 AbstractCegarLoop]: === Iteration 32 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:34,802 INFO L82 PathProgramCache]: Analyzing trace with hash -728662820, now seen corresponding path program 29 times [2018-07-20 21:58:34,803 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:34,803 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:34,803 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:34,804 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:34,804 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:34,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:35,381 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:35,381 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:35,381 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:35,381 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:35,381 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:35,381 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:35,382 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 58 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:35,388 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:35,388 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:35,497 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2018-07-20 21:58:35,497 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:35,499 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:35,540 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:35,540 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:36,362 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:36,382 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:36,382 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 59 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:36,396 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:36,396 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:37,019 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 51 check-sat command(s) [2018-07-20 21:58:37,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:37,026 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:37,075 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:37,076 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:37,727 INFO L134 CoverageAnalysis]: Checked inductivity of 5100 backedges. 2528 proven. 1711 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:37,729 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:37,729 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32, 32, 32] total 52 [2018-07-20 21:58:37,729 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:37,729 INFO L450 AbstractCegarLoop]: Interpolant automaton has 32 states [2018-07-20 21:58:37,730 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2018-07-20 21:58:37,730 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:37,730 INFO L87 Difference]: Start difference. First operand 214 states and 236 transitions. Second operand 32 states. [2018-07-20 21:58:37,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:37,822 INFO L93 Difference]: Finished difference Result 313 states and 358 transitions. [2018-07-20 21:58:37,822 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2018-07-20 21:58:37,822 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 213 [2018-07-20 21:58:37,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:37,823 INFO L225 Difference]: With dead ends: 313 [2018-07-20 21:58:37,823 INFO L226 Difference]: Without dead ends: 219 [2018-07-20 21:58:37,824 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 812 SyntacticMatches, 20 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 490 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:37,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2018-07-20 21:58:37,853 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 218. [2018-07-20 21:58:37,853 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 218 states. [2018-07-20 21:58:37,855 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 218 states to 218 states and 240 transitions. [2018-07-20 21:58:37,855 INFO L78 Accepts]: Start accepts. Automaton has 218 states and 240 transitions. Word has length 213 [2018-07-20 21:58:37,856 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:37,856 INFO L471 AbstractCegarLoop]: Abstraction has 218 states and 240 transitions. [2018-07-20 21:58:37,856 INFO L472 AbstractCegarLoop]: Interpolant automaton has 32 states. [2018-07-20 21:58:37,856 INFO L276 IsEmpty]: Start isEmpty. Operand 218 states and 240 transitions. [2018-07-20 21:58:37,857 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 218 [2018-07-20 21:58:37,857 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:37,858 INFO L358 BasicCegarLoop]: trace histogram [52, 52, 51, 30, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:37,858 INFO L414 AbstractCegarLoop]: === Iteration 33 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:37,858 INFO L82 PathProgramCache]: Analyzing trace with hash -451073014, now seen corresponding path program 30 times [2018-07-20 21:58:37,858 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:37,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:37,859 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:37,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:37,859 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:37,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:38,527 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:38,528 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:38,528 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:38,528 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:38,528 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:38,528 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:38,528 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 60 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:38,534 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:38,534 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:38,603 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-07-20 21:58:38,603 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:38,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:38,631 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:38,631 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:39,332 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:39,352 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:39,352 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 61 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:39,366 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:58:39,366 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:58:39,994 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 49 check-sat command(s) [2018-07-20 21:58:39,994 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:40,000 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:40,025 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:40,026 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:40,241 INFO L134 CoverageAnalysis]: Checked inductivity of 5304 backedges. 2613 proven. 1830 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:40,242 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:40,242 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 33, 33, 33, 33] total 52 [2018-07-20 21:58:40,242 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:40,242 INFO L450 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-07-20 21:58:40,243 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-07-20 21:58:40,243 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:40,243 INFO L87 Difference]: Start difference. First operand 218 states and 240 transitions. Second operand 33 states. [2018-07-20 21:58:40,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:40,332 INFO L93 Difference]: Finished difference Result 317 states and 362 transitions. [2018-07-20 21:58:40,332 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-07-20 21:58:40,332 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 217 [2018-07-20 21:58:40,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:40,334 INFO L225 Difference]: With dead ends: 317 [2018-07-20 21:58:40,334 INFO L226 Difference]: Without dead ends: 223 [2018-07-20 21:58:40,335 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 899 GetRequests, 825 SyntacticMatches, 24 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 588 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:40,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2018-07-20 21:58:40,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 222. [2018-07-20 21:58:40,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2018-07-20 21:58:40,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 244 transitions. [2018-07-20 21:58:40,367 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 244 transitions. Word has length 217 [2018-07-20 21:58:40,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:40,368 INFO L471 AbstractCegarLoop]: Abstraction has 222 states and 244 transitions. [2018-07-20 21:58:40,368 INFO L472 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-07-20 21:58:40,368 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 244 transitions. [2018-07-20 21:58:40,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 222 [2018-07-20 21:58:40,369 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:40,369 INFO L358 BasicCegarLoop]: trace histogram [53, 53, 52, 31, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:40,369 INFO L414 AbstractCegarLoop]: === Iteration 34 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:40,370 INFO L82 PathProgramCache]: Analyzing trace with hash 1556190264, now seen corresponding path program 31 times [2018-07-20 21:58:40,370 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:40,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:40,370 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:40,370 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:40,371 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:40,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:42,432 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:42,433 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:42,433 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:42,433 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:42,433 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:42,433 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:42,433 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 62 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:42,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:42,439 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:42,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:42,482 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:42,508 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:42,508 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:43,228 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:43,248 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:43,248 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 63 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:43,264 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:43,264 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:58:43,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:43,347 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:43,374 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:43,374 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:43,642 INFO L134 CoverageAnalysis]: Checked inductivity of 5512 backedges. 2698 proven. 1953 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:43,644 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:43,644 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34, 34, 34] total 52 [2018-07-20 21:58:43,644 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:43,645 INFO L450 AbstractCegarLoop]: Interpolant automaton has 34 states [2018-07-20 21:58:43,645 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2018-07-20 21:58:43,645 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:43,645 INFO L87 Difference]: Start difference. First operand 222 states and 244 transitions. Second operand 34 states. [2018-07-20 21:58:43,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:43,780 INFO L93 Difference]: Finished difference Result 321 states and 366 transitions. [2018-07-20 21:58:43,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2018-07-20 21:58:43,780 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 221 [2018-07-20 21:58:43,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:43,781 INFO L225 Difference]: With dead ends: 321 [2018-07-20 21:58:43,781 INFO L226 Difference]: Without dead ends: 227 [2018-07-20 21:58:43,782 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 916 GetRequests, 838 SyntacticMatches, 28 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 686 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:43,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2018-07-20 21:58:43,811 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 226. [2018-07-20 21:58:43,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2018-07-20 21:58:43,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 248 transitions. [2018-07-20 21:58:43,812 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 248 transitions. Word has length 221 [2018-07-20 21:58:43,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:43,813 INFO L471 AbstractCegarLoop]: Abstraction has 226 states and 248 transitions. [2018-07-20 21:58:43,813 INFO L472 AbstractCegarLoop]: Interpolant automaton has 34 states. [2018-07-20 21:58:43,813 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 248 transitions. [2018-07-20 21:58:43,814 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 226 [2018-07-20 21:58:43,814 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:43,814 INFO L358 BasicCegarLoop]: trace histogram [54, 54, 53, 32, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:43,814 INFO L414 AbstractCegarLoop]: === Iteration 35 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:43,815 INFO L82 PathProgramCache]: Analyzing trace with hash 511325542, now seen corresponding path program 32 times [2018-07-20 21:58:43,815 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:43,815 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:43,816 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:58:43,816 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:43,816 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:43,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:44,765 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:44,766 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:44,766 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:44,766 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:44,766 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:44,766 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:44,766 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 64 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:44,774 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:44,774 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:44,816 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:44,816 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:44,818 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:44,845 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:44,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:45,570 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:45,590 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:45,590 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 65 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:45,609 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:58:45,609 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:45,696 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:58:45,696 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:45,702 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:45,739 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:45,739 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:46,312 INFO L134 CoverageAnalysis]: Checked inductivity of 5724 backedges. 2783 proven. 2080 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:46,313 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:46,313 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35, 35, 35] total 52 [2018-07-20 21:58:46,313 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:46,314 INFO L450 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-07-20 21:58:46,314 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-07-20 21:58:46,314 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:46,314 INFO L87 Difference]: Start difference. First operand 226 states and 248 transitions. Second operand 35 states. [2018-07-20 21:58:46,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:46,399 INFO L93 Difference]: Finished difference Result 325 states and 370 transitions. [2018-07-20 21:58:46,399 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-07-20 21:58:46,400 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 225 [2018-07-20 21:58:46,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:46,401 INFO L225 Difference]: With dead ends: 325 [2018-07-20 21:58:46,401 INFO L226 Difference]: Without dead ends: 231 [2018-07-20 21:58:46,401 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 933 GetRequests, 851 SyntacticMatches, 32 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 784 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:46,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2018-07-20 21:58:46,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 230. [2018-07-20 21:58:46,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 230 states. [2018-07-20 21:58:46,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 252 transitions. [2018-07-20 21:58:46,432 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 252 transitions. Word has length 225 [2018-07-20 21:58:46,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:46,432 INFO L471 AbstractCegarLoop]: Abstraction has 230 states and 252 transitions. [2018-07-20 21:58:46,432 INFO L472 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-07-20 21:58:46,432 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 252 transitions. [2018-07-20 21:58:46,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2018-07-20 21:58:46,434 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:46,434 INFO L358 BasicCegarLoop]: trace histogram [55, 55, 54, 33, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:46,434 INFO L414 AbstractCegarLoop]: === Iteration 36 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:46,434 INFO L82 PathProgramCache]: Analyzing trace with hash 595758996, now seen corresponding path program 33 times [2018-07-20 21:58:46,434 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:46,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:46,435 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:46,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:46,435 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:46,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:47,621 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:47,622 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:47,622 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:47,622 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:47,622 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:47,622 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:47,622 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 66 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:47,627 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:47,627 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:47,708 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-07-20 21:58:47,708 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:47,711 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:48,510 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 4048 proven. 1807 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-07-20 21:58:48,510 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:49,565 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 4048 proven. 1807 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2018-07-20 21:58:49,585 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:49,585 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 67 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:49,598 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:58:49,598 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:58:50,364 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 55 check-sat command(s) [2018-07-20 21:58:50,364 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:50,370 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:50,397 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:50,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:51,412 INFO L134 CoverageAnalysis]: Checked inductivity of 5940 backedges. 2868 proven. 2211 refuted. 0 times theorem prover too weak. 861 trivial. 0 not checked. [2018-07-20 21:58:51,413 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:51,413 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36, 36, 36] total 97 [2018-07-20 21:58:51,413 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:51,414 INFO L450 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-07-20 21:58:51,414 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-07-20 21:58:51,414 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=2406, Invalid=6906, Unknown=0, NotChecked=0, Total=9312 [2018-07-20 21:58:51,414 INFO L87 Difference]: Start difference. First operand 230 states and 252 transitions. Second operand 70 states. [2018-07-20 21:58:52,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:52,785 INFO L93 Difference]: Finished difference Result 1397 states and 1718 transitions. [2018-07-20 21:58:52,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2018-07-20 21:58:52,785 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 229 [2018-07-20 21:58:52,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:52,789 INFO L225 Difference]: With dead ends: 1397 [2018-07-20 21:58:52,789 INFO L226 Difference]: Without dead ends: 1303 [2018-07-20 21:58:52,790 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1017 GetRequests, 793 SyntacticMatches, 62 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8978 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=6793, Invalid=19939, Unknown=0, NotChecked=0, Total=26732 [2018-07-20 21:58:52,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1303 states. [2018-07-20 21:58:52,886 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1303 to 282. [2018-07-20 21:58:52,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 282 states. [2018-07-20 21:58:52,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 316 transitions. [2018-07-20 21:58:52,888 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 316 transitions. Word has length 229 [2018-07-20 21:58:52,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:52,888 INFO L471 AbstractCegarLoop]: Abstraction has 282 states and 316 transitions. [2018-07-20 21:58:52,888 INFO L472 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-07-20 21:58:52,888 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 316 transitions. [2018-07-20 21:58:52,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 282 [2018-07-20 21:58:52,890 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:52,890 INFO L358 BasicCegarLoop]: trace histogram [68, 68, 67, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:52,890 INFO L414 AbstractCegarLoop]: === Iteration 37 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:52,890 INFO L82 PathProgramCache]: Analyzing trace with hash -760881198, now seen corresponding path program 34 times [2018-07-20 21:58:52,890 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:52,891 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:52,891 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:52,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:52,892 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:52,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:54,546 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:54,546 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:54,546 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:54,546 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:54,547 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:54,547 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:54,547 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 68 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:54,552 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:54,553 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:54,610 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:54,610 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:54,613 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:54,667 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:54,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:55,413 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:55,432 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:55,433 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 69 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:55,446 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:58:55,446 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:58:55,562 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:58:55,563 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:55,569 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:55,619 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:55,619 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:55,996 INFO L134 CoverageAnalysis]: Checked inductivity of 9112 backedges. 4621 proven. 2346 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:55,997 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:58:55,997 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 37, 37, 37, 37] total 52 [2018-07-20 21:58:55,998 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:58:55,998 INFO L450 AbstractCegarLoop]: Interpolant automaton has 37 states [2018-07-20 21:58:55,998 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2018-07-20 21:58:55,998 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:55,998 INFO L87 Difference]: Start difference. First operand 282 states and 316 transitions. Second operand 37 states. [2018-07-20 21:58:56,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:58:56,113 INFO L93 Difference]: Finished difference Result 429 states and 498 transitions. [2018-07-20 21:58:56,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2018-07-20 21:58:56,113 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 281 [2018-07-20 21:58:56,114 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:58:56,115 INFO L225 Difference]: With dead ends: 429 [2018-07-20 21:58:56,115 INFO L226 Difference]: Without dead ends: 287 [2018-07-20 21:58:56,116 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1159 GetRequests, 1069 SyntacticMatches, 40 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 980 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:58:56,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 287 states. [2018-07-20 21:58:56,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 287 to 286. [2018-07-20 21:58:56,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2018-07-20 21:58:56,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 320 transitions. [2018-07-20 21:58:56,187 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 320 transitions. Word has length 281 [2018-07-20 21:58:56,187 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:58:56,187 INFO L471 AbstractCegarLoop]: Abstraction has 286 states and 320 transitions. [2018-07-20 21:58:56,187 INFO L472 AbstractCegarLoop]: Interpolant automaton has 37 states. [2018-07-20 21:58:56,187 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 320 transitions. [2018-07-20 21:58:56,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 286 [2018-07-20 21:58:56,189 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:58:56,189 INFO L358 BasicCegarLoop]: trace histogram [69, 69, 68, 35, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:58:56,189 INFO L414 AbstractCegarLoop]: === Iteration 38 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:58:56,189 INFO L82 PathProgramCache]: Analyzing trace with hash -344860672, now seen corresponding path program 35 times [2018-07-20 21:58:56,190 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:58:56,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:56,190 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:58:56,190 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:58:56,191 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:58:56,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:58:57,633 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:57,634 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:57,634 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:58:57,634 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:58:57,634 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:58:57,634 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:57,634 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 70 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:58:57,640 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:57,640 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:57,758 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-07-20 21:58:57,758 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:57,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:57,798 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:57,799 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:58:58,565 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:58,584 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:58:58,584 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 71 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:58:58,598 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:58:58,598 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:58:59,665 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 69 check-sat command(s) [2018-07-20 21:58:59,665 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:58:59,671 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:58:59,718 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:58:59,718 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:00,104 INFO L134 CoverageAnalysis]: Checked inductivity of 9384 backedges. 4754 proven. 2485 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:00,105 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:00,106 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38, 38, 38] total 52 [2018-07-20 21:59:00,106 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:00,106 INFO L450 AbstractCegarLoop]: Interpolant automaton has 38 states [2018-07-20 21:59:00,106 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2018-07-20 21:59:00,106 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:00,107 INFO L87 Difference]: Start difference. First operand 286 states and 320 transitions. Second operand 38 states. [2018-07-20 21:59:00,215 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:00,215 INFO L93 Difference]: Finished difference Result 433 states and 502 transitions. [2018-07-20 21:59:00,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-07-20 21:59:00,216 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 285 [2018-07-20 21:59:00,216 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:00,217 INFO L225 Difference]: With dead ends: 433 [2018-07-20 21:59:00,217 INFO L226 Difference]: Without dead ends: 291 [2018-07-20 21:59:00,218 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1176 GetRequests, 1082 SyntacticMatches, 44 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1078 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:00,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 291 states. [2018-07-20 21:59:00,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 291 to 290. [2018-07-20 21:59:00,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 290 states. [2018-07-20 21:59:00,277 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 290 states to 290 states and 324 transitions. [2018-07-20 21:59:00,277 INFO L78 Accepts]: Start accepts. Automaton has 290 states and 324 transitions. Word has length 285 [2018-07-20 21:59:00,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:00,277 INFO L471 AbstractCegarLoop]: Abstraction has 290 states and 324 transitions. [2018-07-20 21:59:00,277 INFO L472 AbstractCegarLoop]: Interpolant automaton has 38 states. [2018-07-20 21:59:00,278 INFO L276 IsEmpty]: Start isEmpty. Operand 290 states and 324 transitions. [2018-07-20 21:59:00,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 290 [2018-07-20 21:59:00,279 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:00,280 INFO L358 BasicCegarLoop]: trace histogram [70, 70, 69, 36, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:00,280 INFO L414 AbstractCegarLoop]: === Iteration 39 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:00,280 INFO L82 PathProgramCache]: Analyzing trace with hash 1342834990, now seen corresponding path program 36 times [2018-07-20 21:59:00,280 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:00,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:00,281 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:00,281 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:00,281 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:00,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:00,914 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:00,914 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:00,914 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:00,914 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:00,914 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:00,914 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:00,914 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 72 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:00,920 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:00,921 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:01,028 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-07-20 21:59:01,028 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:01,031 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:01,085 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:01,085 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:01,859 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:01,878 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:01,878 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 73 with cvc4nyu --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 73 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:01,892 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:01,892 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:03,013 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 68 check-sat command(s) [2018-07-20 21:59:03,013 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:03,020 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:03,059 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:03,059 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:03,476 INFO L134 CoverageAnalysis]: Checked inductivity of 9660 backedges. 4887 proven. 2628 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:03,477 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:03,477 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 39, 39, 39, 39] total 52 [2018-07-20 21:59:03,477 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:03,478 INFO L450 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-07-20 21:59:03,478 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-07-20 21:59:03,478 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:03,478 INFO L87 Difference]: Start difference. First operand 290 states and 324 transitions. Second operand 39 states. [2018-07-20 21:59:03,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:03,595 INFO L93 Difference]: Finished difference Result 437 states and 506 transitions. [2018-07-20 21:59:03,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-07-20 21:59:03,595 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 289 [2018-07-20 21:59:03,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:03,596 INFO L225 Difference]: With dead ends: 437 [2018-07-20 21:59:03,596 INFO L226 Difference]: Without dead ends: 295 [2018-07-20 21:59:03,597 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1193 GetRequests, 1095 SyntacticMatches, 48 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1176 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:03,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 295 states. [2018-07-20 21:59:03,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 295 to 294. [2018-07-20 21:59:03,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 294 states. [2018-07-20 21:59:03,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 294 states to 294 states and 328 transitions. [2018-07-20 21:59:03,662 INFO L78 Accepts]: Start accepts. Automaton has 294 states and 328 transitions. Word has length 289 [2018-07-20 21:59:03,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:03,662 INFO L471 AbstractCegarLoop]: Abstraction has 294 states and 328 transitions. [2018-07-20 21:59:03,663 INFO L472 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-07-20 21:59:03,663 INFO L276 IsEmpty]: Start isEmpty. Operand 294 states and 328 transitions. [2018-07-20 21:59:03,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 294 [2018-07-20 21:59:03,664 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:03,665 INFO L358 BasicCegarLoop]: trace histogram [71, 71, 70, 37, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:03,665 INFO L414 AbstractCegarLoop]: === Iteration 40 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:03,665 INFO L82 PathProgramCache]: Analyzing trace with hash 1571418972, now seen corresponding path program 37 times [2018-07-20 21:59:03,665 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:03,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:03,666 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:03,666 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:03,666 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:03,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:04,433 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:04,434 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:04,434 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:04,434 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:04,434 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:04,434 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:04,434 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 74 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:04,441 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:04,441 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:04,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:04,496 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:04,535 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:04,536 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:05,321 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:05,340 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:05,340 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 75 with cvc4nyu --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 75 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:05,354 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:05,354 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:05,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:05,464 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:05,503 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:05,504 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:05,955 INFO L134 CoverageAnalysis]: Checked inductivity of 9940 backedges. 5020 proven. 2775 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:05,956 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:05,957 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40, 40, 40] total 52 [2018-07-20 21:59:05,957 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:05,957 INFO L450 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-07-20 21:59:05,957 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-07-20 21:59:05,957 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:05,958 INFO L87 Difference]: Start difference. First operand 294 states and 328 transitions. Second operand 40 states. [2018-07-20 21:59:06,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:06,079 INFO L93 Difference]: Finished difference Result 441 states and 510 transitions. [2018-07-20 21:59:06,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2018-07-20 21:59:06,080 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 293 [2018-07-20 21:59:06,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:06,081 INFO L225 Difference]: With dead ends: 441 [2018-07-20 21:59:06,081 INFO L226 Difference]: Without dead ends: 299 [2018-07-20 21:59:06,081 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1210 GetRequests, 1108 SyntacticMatches, 52 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1274 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:06,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2018-07-20 21:59:06,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 298. [2018-07-20 21:59:06,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 298 states. [2018-07-20 21:59:06,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 332 transitions. [2018-07-20 21:59:06,170 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 332 transitions. Word has length 293 [2018-07-20 21:59:06,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:06,170 INFO L471 AbstractCegarLoop]: Abstraction has 298 states and 332 transitions. [2018-07-20 21:59:06,170 INFO L472 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-07-20 21:59:06,170 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 332 transitions. [2018-07-20 21:59:06,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 298 [2018-07-20 21:59:06,172 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:06,172 INFO L358 BasicCegarLoop]: trace histogram [72, 72, 71, 38, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:06,172 INFO L414 AbstractCegarLoop]: === Iteration 41 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:06,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1741493898, now seen corresponding path program 38 times [2018-07-20 21:59:06,173 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:06,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:06,173 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:06,173 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:06,174 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:06,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:06,860 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:06,860 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:06,860 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:06,861 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:06,861 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:06,861 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:06,861 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 76 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:06,867 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:59:06,867 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:06,921 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:59:06,922 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:06,925 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:06,966 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:06,966 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:07,776 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:07,795 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:07,796 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 77 with cvc4nyu --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 77 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:07,809 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:59:07,809 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:07,922 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:59:07,922 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:07,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:07,969 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:07,970 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:08,480 INFO L134 CoverageAnalysis]: Checked inductivity of 10224 backedges. 5153 proven. 2926 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:08,481 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:08,482 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 41, 41, 41, 41] total 52 [2018-07-20 21:59:08,482 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:08,482 INFO L450 AbstractCegarLoop]: Interpolant automaton has 41 states [2018-07-20 21:59:08,482 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2018-07-20 21:59:08,482 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:08,482 INFO L87 Difference]: Start difference. First operand 298 states and 332 transitions. Second operand 41 states. [2018-07-20 21:59:08,595 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:08,595 INFO L93 Difference]: Finished difference Result 445 states and 514 transitions. [2018-07-20 21:59:08,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-07-20 21:59:08,595 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 297 [2018-07-20 21:59:08,596 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:08,596 INFO L225 Difference]: With dead ends: 445 [2018-07-20 21:59:08,596 INFO L226 Difference]: Without dead ends: 303 [2018-07-20 21:59:08,597 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1227 GetRequests, 1121 SyntacticMatches, 56 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1372 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:08,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 303 states. [2018-07-20 21:59:08,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 303 to 302. [2018-07-20 21:59:08,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 302 states. [2018-07-20 21:59:08,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 302 states to 302 states and 336 transitions. [2018-07-20 21:59:08,645 INFO L78 Accepts]: Start accepts. Automaton has 302 states and 336 transitions. Word has length 297 [2018-07-20 21:59:08,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:08,646 INFO L471 AbstractCegarLoop]: Abstraction has 302 states and 336 transitions. [2018-07-20 21:59:08,646 INFO L472 AbstractCegarLoop]: Interpolant automaton has 41 states. [2018-07-20 21:59:08,646 INFO L276 IsEmpty]: Start isEmpty. Operand 302 states and 336 transitions. [2018-07-20 21:59:08,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 302 [2018-07-20 21:59:08,647 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:08,648 INFO L358 BasicCegarLoop]: trace histogram [73, 73, 72, 39, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:08,648 INFO L414 AbstractCegarLoop]: === Iteration 42 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:08,648 INFO L82 PathProgramCache]: Analyzing trace with hash -1741753672, now seen corresponding path program 39 times [2018-07-20 21:59:08,648 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:08,648 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:08,648 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:08,649 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:08,649 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:08,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:09,304 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:09,304 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:09,304 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:09,304 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:09,305 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:09,305 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:09,305 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 78 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:09,311 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:59:09,311 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:59:09,429 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2018-07-20 21:59:09,429 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:09,433 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:09,486 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:09,486 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:10,314 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:10,333 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:10,334 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 79 with cvc4nyu --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 79 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:10,347 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:59:10,347 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:59:11,639 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 73 check-sat command(s) [2018-07-20 21:59:11,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:11,646 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:11,716 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:11,716 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:12,308 INFO L134 CoverageAnalysis]: Checked inductivity of 10512 backedges. 5286 proven. 3081 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:12,309 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:12,310 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42, 42, 42] total 52 [2018-07-20 21:59:12,310 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:12,310 INFO L450 AbstractCegarLoop]: Interpolant automaton has 42 states [2018-07-20 21:59:12,310 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2018-07-20 21:59:12,310 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:12,311 INFO L87 Difference]: Start difference. First operand 302 states and 336 transitions. Second operand 42 states. [2018-07-20 21:59:12,435 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:12,435 INFO L93 Difference]: Finished difference Result 449 states and 518 transitions. [2018-07-20 21:59:12,436 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-07-20 21:59:12,436 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 301 [2018-07-20 21:59:12,436 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:12,437 INFO L225 Difference]: With dead ends: 449 [2018-07-20 21:59:12,437 INFO L226 Difference]: Without dead ends: 307 [2018-07-20 21:59:12,437 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1244 GetRequests, 1134 SyntacticMatches, 60 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1470 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:12,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 307 states. [2018-07-20 21:59:12,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 307 to 306. [2018-07-20 21:59:12,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 306 states. [2018-07-20 21:59:12,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 306 states to 306 states and 340 transitions. [2018-07-20 21:59:12,486 INFO L78 Accepts]: Start accepts. Automaton has 306 states and 340 transitions. Word has length 301 [2018-07-20 21:59:12,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:12,486 INFO L471 AbstractCegarLoop]: Abstraction has 306 states and 340 transitions. [2018-07-20 21:59:12,486 INFO L472 AbstractCegarLoop]: Interpolant automaton has 42 states. [2018-07-20 21:59:12,486 INFO L276 IsEmpty]: Start isEmpty. Operand 306 states and 340 transitions. [2018-07-20 21:59:12,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 306 [2018-07-20 21:59:12,487 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:12,487 INFO L358 BasicCegarLoop]: trace histogram [74, 74, 73, 40, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:12,487 INFO L414 AbstractCegarLoop]: === Iteration 43 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:12,488 INFO L82 PathProgramCache]: Analyzing trace with hash -825554970, now seen corresponding path program 40 times [2018-07-20 21:59:12,488 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:12,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:12,488 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:12,488 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:12,489 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:12,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:13,414 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:13,414 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:13,414 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:13,414 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:13,414 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:13,414 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:13,414 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 80 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:13,419 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:59:13,420 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:59:13,488 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:59:13,488 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:13,491 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:13,535 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:13,535 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:14,332 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:14,351 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:14,352 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 81 with cvc4nyu --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 81 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:14,365 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:59:14,365 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:59:14,490 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:59:14,490 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:14,518 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:14,573 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:14,573 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:15,128 INFO L134 CoverageAnalysis]: Checked inductivity of 10804 backedges. 5419 proven. 3240 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:15,130 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:15,130 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 43, 43, 43, 43] total 52 [2018-07-20 21:59:15,130 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:15,130 INFO L450 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-07-20 21:59:15,131 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-07-20 21:59:15,131 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:15,131 INFO L87 Difference]: Start difference. First operand 306 states and 340 transitions. Second operand 43 states. [2018-07-20 21:59:15,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:15,332 INFO L93 Difference]: Finished difference Result 453 states and 522 transitions. [2018-07-20 21:59:15,334 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-07-20 21:59:15,334 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 305 [2018-07-20 21:59:15,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:15,336 INFO L225 Difference]: With dead ends: 453 [2018-07-20 21:59:15,336 INFO L226 Difference]: Without dead ends: 311 [2018-07-20 21:59:15,337 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1261 GetRequests, 1147 SyntacticMatches, 64 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1568 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:15,337 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 311 states. [2018-07-20 21:59:15,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 311 to 310. [2018-07-20 21:59:15,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 310 states. [2018-07-20 21:59:15,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 310 states to 310 states and 344 transitions. [2018-07-20 21:59:15,423 INFO L78 Accepts]: Start accepts. Automaton has 310 states and 344 transitions. Word has length 305 [2018-07-20 21:59:15,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:15,423 INFO L471 AbstractCegarLoop]: Abstraction has 310 states and 344 transitions. [2018-07-20 21:59:15,423 INFO L472 AbstractCegarLoop]: Interpolant automaton has 43 states. [2018-07-20 21:59:15,423 INFO L276 IsEmpty]: Start isEmpty. Operand 310 states and 344 transitions. [2018-07-20 21:59:15,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 310 [2018-07-20 21:59:15,425 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:15,425 INFO L358 BasicCegarLoop]: trace histogram [75, 75, 74, 41, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:15,426 INFO L414 AbstractCegarLoop]: === Iteration 44 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:15,426 INFO L82 PathProgramCache]: Analyzing trace with hash -2116233708, now seen corresponding path program 41 times [2018-07-20 21:59:15,426 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:15,426 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:15,427 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:15,427 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:15,427 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:15,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:17,972 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:17,973 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:17,973 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:17,973 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:17,973 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:17,973 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:17,973 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 82 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:17,980 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:59:17,980 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:18,102 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 75 check-sat command(s) [2018-07-20 21:59:18,102 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:18,105 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:18,150 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:18,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:18,957 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:18,977 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:18,977 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 83 with cvc4nyu --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 83 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:18,991 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:59:18,991 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:20,262 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 75 check-sat command(s) [2018-07-20 21:59:20,263 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:20,270 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:20,315 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:20,315 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:20,895 INFO L134 CoverageAnalysis]: Checked inductivity of 11100 backedges. 5552 proven. 3403 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:20,896 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:20,897 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44, 44, 44] total 52 [2018-07-20 21:59:20,897 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:20,897 INFO L450 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-07-20 21:59:20,897 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-07-20 21:59:20,897 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:20,898 INFO L87 Difference]: Start difference. First operand 310 states and 344 transitions. Second operand 44 states. [2018-07-20 21:59:21,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:21,017 INFO L93 Difference]: Finished difference Result 457 states and 526 transitions. [2018-07-20 21:59:21,017 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-07-20 21:59:21,017 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 309 [2018-07-20 21:59:21,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:21,018 INFO L225 Difference]: With dead ends: 457 [2018-07-20 21:59:21,019 INFO L226 Difference]: Without dead ends: 315 [2018-07-20 21:59:21,019 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1278 GetRequests, 1160 SyntacticMatches, 68 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1666 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:21,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2018-07-20 21:59:21,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 314. [2018-07-20 21:59:21,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 314 states. [2018-07-20 21:59:21,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 314 states to 314 states and 348 transitions. [2018-07-20 21:59:21,068 INFO L78 Accepts]: Start accepts. Automaton has 314 states and 348 transitions. Word has length 309 [2018-07-20 21:59:21,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:21,068 INFO L471 AbstractCegarLoop]: Abstraction has 314 states and 348 transitions. [2018-07-20 21:59:21,069 INFO L472 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-07-20 21:59:21,069 INFO L276 IsEmpty]: Start isEmpty. Operand 314 states and 348 transitions. [2018-07-20 21:59:21,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 314 [2018-07-20 21:59:21,070 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:21,071 INFO L358 BasicCegarLoop]: trace histogram [76, 76, 75, 42, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:21,071 INFO L414 AbstractCegarLoop]: === Iteration 45 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:21,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1646273214, now seen corresponding path program 42 times [2018-07-20 21:59:21,071 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:21,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:21,072 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:21,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:21,072 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:21,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:22,125 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:22,126 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:22,126 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:22,126 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:22,126 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:22,126 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:22,126 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 84 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:22,133 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:22,133 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:22,249 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2018-07-20 21:59:22,249 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:22,252 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:22,298 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:22,299 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:23,159 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:23,179 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:23,179 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 85 with cvc4nyu --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 85 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:23,192 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:23,192 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:24,473 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 73 check-sat command(s) [2018-07-20 21:59:24,473 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:24,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:24,527 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:24,527 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:25,181 INFO L134 CoverageAnalysis]: Checked inductivity of 11400 backedges. 5685 proven. 3570 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:25,183 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:25,183 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 45, 45, 45, 45] total 52 [2018-07-20 21:59:25,183 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:25,184 INFO L450 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-07-20 21:59:25,184 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-07-20 21:59:25,184 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:25,184 INFO L87 Difference]: Start difference. First operand 314 states and 348 transitions. Second operand 45 states. [2018-07-20 21:59:25,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:25,304 INFO L93 Difference]: Finished difference Result 461 states and 530 transitions. [2018-07-20 21:59:25,304 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2018-07-20 21:59:25,304 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 313 [2018-07-20 21:59:25,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:25,305 INFO L225 Difference]: With dead ends: 461 [2018-07-20 21:59:25,305 INFO L226 Difference]: Without dead ends: 319 [2018-07-20 21:59:25,306 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1295 GetRequests, 1173 SyntacticMatches, 72 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1764 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:25,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 319 states. [2018-07-20 21:59:25,367 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 319 to 318. [2018-07-20 21:59:25,367 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2018-07-20 21:59:25,368 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 352 transitions. [2018-07-20 21:59:25,368 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 352 transitions. Word has length 313 [2018-07-20 21:59:25,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:25,368 INFO L471 AbstractCegarLoop]: Abstraction has 318 states and 352 transitions. [2018-07-20 21:59:25,369 INFO L472 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-07-20 21:59:25,369 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 352 transitions. [2018-07-20 21:59:25,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 318 [2018-07-20 21:59:25,370 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:25,370 INFO L358 BasicCegarLoop]: trace histogram [77, 77, 76, 43, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:25,370 INFO L414 AbstractCegarLoop]: === Iteration 46 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:25,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1703910768, now seen corresponding path program 43 times [2018-07-20 21:59:25,371 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:25,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:25,371 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:25,371 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:25,371 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:26,655 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:26,655 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:26,656 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:26,656 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:26,656 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:26,656 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:26,656 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 86 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:26,662 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:26,662 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:26,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:26,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:26,768 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:26,768 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:27,593 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:27,612 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:27,612 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 87 with cvc4nyu --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 87 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:27,628 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:27,628 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:27,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:27,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:27,795 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:27,795 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:28,471 INFO L134 CoverageAnalysis]: Checked inductivity of 11704 backedges. 5818 proven. 3741 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:28,473 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:28,473 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 46, 46, 46, 46] total 52 [2018-07-20 21:59:28,473 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:28,473 INFO L450 AbstractCegarLoop]: Interpolant automaton has 46 states [2018-07-20 21:59:28,474 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2018-07-20 21:59:28,474 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:28,474 INFO L87 Difference]: Start difference. First operand 318 states and 352 transitions. Second operand 46 states. [2018-07-20 21:59:28,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:28,610 INFO L93 Difference]: Finished difference Result 465 states and 534 transitions. [2018-07-20 21:59:28,610 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2018-07-20 21:59:28,610 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 317 [2018-07-20 21:59:28,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:28,611 INFO L225 Difference]: With dead ends: 465 [2018-07-20 21:59:28,611 INFO L226 Difference]: Without dead ends: 323 [2018-07-20 21:59:28,612 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1312 GetRequests, 1186 SyntacticMatches, 76 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1862 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:28,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2018-07-20 21:59:28,665 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 322. [2018-07-20 21:59:28,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 322 states. [2018-07-20 21:59:28,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 322 states to 322 states and 356 transitions. [2018-07-20 21:59:28,667 INFO L78 Accepts]: Start accepts. Automaton has 322 states and 356 transitions. Word has length 317 [2018-07-20 21:59:28,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:28,667 INFO L471 AbstractCegarLoop]: Abstraction has 322 states and 356 transitions. [2018-07-20 21:59:28,667 INFO L472 AbstractCegarLoop]: Interpolant automaton has 46 states. [2018-07-20 21:59:28,667 INFO L276 IsEmpty]: Start isEmpty. Operand 322 states and 356 transitions. [2018-07-20 21:59:28,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 322 [2018-07-20 21:59:28,669 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:28,669 INFO L358 BasicCegarLoop]: trace histogram [78, 78, 77, 44, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:28,669 INFO L414 AbstractCegarLoop]: === Iteration 47 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:28,670 INFO L82 PathProgramCache]: Analyzing trace with hash 1374131870, now seen corresponding path program 44 times [2018-07-20 21:59:28,670 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:28,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:28,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:28,671 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:28,671 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:28,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:29,563 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:29,563 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:29,583 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:29,584 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:29,584 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:29,584 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:29,584 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 88 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:29,590 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:59:29,590 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:29,648 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:59:29,648 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:29,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:29,699 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:29,700 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:30,536 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:30,555 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:30,556 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 89 with cvc4nyu --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 89 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:30,569 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:59:30,569 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:30,689 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:59:30,689 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:30,697 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:30,746 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:30,746 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:31,476 INFO L134 CoverageAnalysis]: Checked inductivity of 12012 backedges. 5951 proven. 3916 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:31,478 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:31,478 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47, 47, 47] total 52 [2018-07-20 21:59:31,478 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:31,479 INFO L450 AbstractCegarLoop]: Interpolant automaton has 47 states [2018-07-20 21:59:31,479 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2018-07-20 21:59:31,479 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:31,479 INFO L87 Difference]: Start difference. First operand 322 states and 356 transitions. Second operand 47 states. [2018-07-20 21:59:31,615 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:31,615 INFO L93 Difference]: Finished difference Result 469 states and 538 transitions. [2018-07-20 21:59:31,615 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2018-07-20 21:59:31,615 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 321 [2018-07-20 21:59:31,615 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:31,616 INFO L225 Difference]: With dead ends: 469 [2018-07-20 21:59:31,616 INFO L226 Difference]: Without dead ends: 327 [2018-07-20 21:59:31,617 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1329 GetRequests, 1199 SyntacticMatches, 80 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1960 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:31,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2018-07-20 21:59:31,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 326. [2018-07-20 21:59:31,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 326 states. [2018-07-20 21:59:31,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 326 states to 326 states and 360 transitions. [2018-07-20 21:59:31,673 INFO L78 Accepts]: Start accepts. Automaton has 326 states and 360 transitions. Word has length 321 [2018-07-20 21:59:31,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:31,673 INFO L471 AbstractCegarLoop]: Abstraction has 326 states and 360 transitions. [2018-07-20 21:59:31,673 INFO L472 AbstractCegarLoop]: Interpolant automaton has 47 states. [2018-07-20 21:59:31,673 INFO L276 IsEmpty]: Start isEmpty. Operand 326 states and 360 transitions. [2018-07-20 21:59:31,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 326 [2018-07-20 21:59:31,675 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:31,675 INFO L358 BasicCegarLoop]: trace histogram [79, 79, 78, 45, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:31,675 INFO L414 AbstractCegarLoop]: === Iteration 48 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:31,675 INFO L82 PathProgramCache]: Analyzing trace with hash -232568628, now seen corresponding path program 45 times [2018-07-20 21:59:31,675 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:31,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:31,676 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:31,676 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:31,676 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:31,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:32,613 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:32,614 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:32,614 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:32,614 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:32,614 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:32,614 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:32,614 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-07-20 21:59:32,622 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:59:32,622 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) Waiting until toolchain timeout for monitored process 90 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:32,757 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 79 check-sat command(s) [2018-07-20 21:59:32,757 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:32,761 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:34,218 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 7768 proven. 4423 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2018-07-20 21:59:34,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:36,307 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 7768 proven. 4423 refuted. 0 times theorem prover too weak. 133 trivial. 0 not checked. [2018-07-20 21:59:36,327 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:36,327 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 91 with cvc4nyu --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 91 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:36,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:59:36,341 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:59:37,824 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 79 check-sat command(s) [2018-07-20 21:59:37,824 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:37,832 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:37,896 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:37,896 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:38,825 INFO L134 CoverageAnalysis]: Checked inductivity of 12324 backedges. 6084 proven. 4095 refuted. 0 times theorem prover too weak. 2145 trivial. 0 not checked. [2018-07-20 21:59:38,827 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:38,827 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48, 48, 48] total 109 [2018-07-20 21:59:38,827 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:38,828 INFO L450 AbstractCegarLoop]: Interpolant automaton has 94 states [2018-07-20 21:59:38,828 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 94 interpolants. [2018-07-20 21:59:38,828 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3036, Invalid=8736, Unknown=0, NotChecked=0, Total=11772 [2018-07-20 21:59:38,828 INFO L87 Difference]: Start difference. First operand 326 states and 360 transitions. Second operand 94 states. [2018-07-20 21:59:41,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:41,007 INFO L93 Difference]: Finished difference Result 2117 states and 2606 transitions. [2018-07-20 21:59:41,007 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2018-07-20 21:59:41,007 INFO L78 Accepts]: Start accepts. Automaton has 94 states. Word has length 325 [2018-07-20 21:59:41,008 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:41,012 INFO L225 Difference]: With dead ends: 2117 [2018-07-20 21:59:41,012 INFO L226 Difference]: Without dead ends: 1975 [2018-07-20 21:59:41,014 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1437 GetRequests, 1129 SyntacticMatches, 110 SemanticMatches, 198 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15758 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8995, Invalid=30805, Unknown=0, NotChecked=0, Total=39800 [2018-07-20 21:59:41,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1975 states. [2018-07-20 21:59:41,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1975 to 378. [2018-07-20 21:59:41,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 378 states. [2018-07-20 21:59:41,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 378 states to 378 states and 424 transitions. [2018-07-20 21:59:41,164 INFO L78 Accepts]: Start accepts. Automaton has 378 states and 424 transitions. Word has length 325 [2018-07-20 21:59:41,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:41,164 INFO L471 AbstractCegarLoop]: Abstraction has 378 states and 424 transitions. [2018-07-20 21:59:41,164 INFO L472 AbstractCegarLoop]: Interpolant automaton has 94 states. [2018-07-20 21:59:41,164 INFO L276 IsEmpty]: Start isEmpty. Operand 378 states and 424 transitions. [2018-07-20 21:59:41,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 378 [2018-07-20 21:59:41,165 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:41,166 INFO L358 BasicCegarLoop]: trace histogram [92, 92, 91, 46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:41,166 INFO L414 AbstractCegarLoop]: === Iteration 49 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:41,166 INFO L82 PathProgramCache]: Analyzing trace with hash -597581558, now seen corresponding path program 46 times [2018-07-20 21:59:41,166 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:41,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:41,167 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:41,167 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:41,167 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:41,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:42,121 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:42,121 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:42,121 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:42,121 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:42,121 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:42,121 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:42,122 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 92 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:42,127 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:59:42,127 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:59:42,196 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:59:42,196 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:42,200 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:42,262 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:42,262 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:43,118 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:43,137 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:43,137 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 93 with cvc4nyu --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 93 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:43,151 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:59:43,151 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:59:43,354 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:59:43,354 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:43,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:43,424 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:43,424 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:44,180 INFO L134 CoverageAnalysis]: Checked inductivity of 16744 backedges. 8461 proven. 4278 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:44,181 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:44,182 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49, 49, 49] total 52 [2018-07-20 21:59:44,182 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:44,182 INFO L450 AbstractCegarLoop]: Interpolant automaton has 49 states [2018-07-20 21:59:44,182 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2018-07-20 21:59:44,182 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:44,182 INFO L87 Difference]: Start difference. First operand 378 states and 424 transitions. Second operand 49 states. [2018-07-20 21:59:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:44,391 INFO L93 Difference]: Finished difference Result 573 states and 666 transitions. [2018-07-20 21:59:44,392 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2018-07-20 21:59:44,392 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 377 [2018-07-20 21:59:44,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:44,393 INFO L225 Difference]: With dead ends: 573 [2018-07-20 21:59:44,393 INFO L226 Difference]: Without dead ends: 383 [2018-07-20 21:59:44,394 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1555 GetRequests, 1417 SyntacticMatches, 88 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:44,394 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2018-07-20 21:59:44,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 382. [2018-07-20 21:59:44,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 382 states. [2018-07-20 21:59:44,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 382 states to 382 states and 428 transitions. [2018-07-20 21:59:44,520 INFO L78 Accepts]: Start accepts. Automaton has 382 states and 428 transitions. Word has length 377 [2018-07-20 21:59:44,521 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:44,521 INFO L471 AbstractCegarLoop]: Abstraction has 382 states and 428 transitions. [2018-07-20 21:59:44,521 INFO L472 AbstractCegarLoop]: Interpolant automaton has 49 states. [2018-07-20 21:59:44,521 INFO L276 IsEmpty]: Start isEmpty. Operand 382 states and 428 transitions. [2018-07-20 21:59:44,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 382 [2018-07-20 21:59:44,522 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:44,523 INFO L358 BasicCegarLoop]: trace histogram [93, 93, 92, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:44,523 INFO L414 AbstractCegarLoop]: === Iteration 50 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:44,523 INFO L82 PathProgramCache]: Analyzing trace with hash 1048113464, now seen corresponding path program 47 times [2018-07-20 21:59:44,523 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:44,524 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:44,524 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:44,524 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:44,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:45,562 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:45,562 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:45,562 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:45,562 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:45,563 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:45,563 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:45,563 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 94 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:45,569 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:59:45,569 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:45,739 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 93 check-sat command(s) [2018-07-20 21:59:45,739 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:45,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:45,807 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:45,808 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:46,699 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:46,718 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:46,719 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 95 with cvc4nyu --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 95 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:46,732 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:59:46,732 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:59:48,638 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 93 check-sat command(s) [2018-07-20 21:59:48,639 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:48,648 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:48,710 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:48,710 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:49,561 INFO L134 CoverageAnalysis]: Checked inductivity of 17112 backedges. 8642 proven. 4465 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:49,562 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:49,563 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50, 50, 50] total 52 [2018-07-20 21:59:49,563 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:49,563 INFO L450 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-07-20 21:59:49,563 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-07-20 21:59:49,564 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:49,564 INFO L87 Difference]: Start difference. First operand 382 states and 428 transitions. Second operand 50 states. [2018-07-20 21:59:49,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:49,767 INFO L93 Difference]: Finished difference Result 577 states and 670 transitions. [2018-07-20 21:59:49,780 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-07-20 21:59:49,780 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 381 [2018-07-20 21:59:49,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:49,782 INFO L225 Difference]: With dead ends: 577 [2018-07-20 21:59:49,782 INFO L226 Difference]: Without dead ends: 387 [2018-07-20 21:59:49,783 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1572 GetRequests, 1430 SyntacticMatches, 92 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2254 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:49,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2018-07-20 21:59:49,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 386. [2018-07-20 21:59:49,901 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 386 states. [2018-07-20 21:59:49,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 386 states to 386 states and 432 transitions. [2018-07-20 21:59:49,902 INFO L78 Accepts]: Start accepts. Automaton has 386 states and 432 transitions. Word has length 381 [2018-07-20 21:59:49,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:49,902 INFO L471 AbstractCegarLoop]: Abstraction has 386 states and 432 transitions. [2018-07-20 21:59:49,902 INFO L472 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-07-20 21:59:49,902 INFO L276 IsEmpty]: Start isEmpty. Operand 386 states and 432 transitions. [2018-07-20 21:59:49,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2018-07-20 21:59:49,904 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:49,904 INFO L358 BasicCegarLoop]: trace histogram [94, 94, 93, 48, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:49,904 INFO L414 AbstractCegarLoop]: === Iteration 51 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:49,904 INFO L82 PathProgramCache]: Analyzing trace with hash 653294182, now seen corresponding path program 48 times [2018-07-20 21:59:49,904 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:49,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:49,905 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:49,905 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:49,905 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:49,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:50,868 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:50,869 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:50,869 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:50,869 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:50,869 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:50,869 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:50,869 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 96 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:50,877 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:50,877 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:51,188 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 92 check-sat command(s) [2018-07-20 21:59:51,188 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:51,192 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:51,256 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:51,257 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:52,144 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:52,164 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:52,179 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 97 with cvc4nyu --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 97 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:52,206 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:59:52,206 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:59:54,174 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 92 check-sat command(s) [2018-07-20 21:59:54,174 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:59:54,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:54,248 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:54,248 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:55,068 INFO L134 CoverageAnalysis]: Checked inductivity of 17484 backedges. 8823 proven. 4656 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:55,069 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:55,070 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51, 51, 51] total 52 [2018-07-20 21:59:55,070 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:55,070 INFO L450 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-07-20 21:59:55,071 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-07-20 21:59:55,071 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:55,071 INFO L87 Difference]: Start difference. First operand 386 states and 432 transitions. Second operand 51 states. [2018-07-20 21:59:55,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:55,284 INFO L93 Difference]: Finished difference Result 581 states and 674 transitions. [2018-07-20 21:59:55,284 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-07-20 21:59:55,284 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 385 [2018-07-20 21:59:55,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:55,286 INFO L225 Difference]: With dead ends: 581 [2018-07-20 21:59:55,286 INFO L226 Difference]: Without dead ends: 391 [2018-07-20 21:59:55,286 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1589 GetRequests, 1443 SyntacticMatches, 96 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2352 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:55,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2018-07-20 21:59:55,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 390. [2018-07-20 21:59:55,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 390 states. [2018-07-20 21:59:55,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 390 states to 390 states and 436 transitions. [2018-07-20 21:59:55,404 INFO L78 Accepts]: Start accepts. Automaton has 390 states and 436 transitions. Word has length 385 [2018-07-20 21:59:55,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:55,405 INFO L471 AbstractCegarLoop]: Abstraction has 390 states and 436 transitions. [2018-07-20 21:59:55,405 INFO L472 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-07-20 21:59:55,405 INFO L276 IsEmpty]: Start isEmpty. Operand 390 states and 436 transitions. [2018-07-20 21:59:55,407 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 390 [2018-07-20 21:59:55,407 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:55,407 INFO L358 BasicCegarLoop]: trace histogram [95, 95, 94, 49, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:55,407 INFO L414 AbstractCegarLoop]: === Iteration 52 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:55,407 INFO L82 PathProgramCache]: Analyzing trace with hash -1996243820, now seen corresponding path program 49 times [2018-07-20 21:59:55,407 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:55,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:55,408 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:59:55,408 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:55,408 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:55,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:56,437 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:56,438 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:56,438 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:59:56,438 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:59:56,438 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:59:56,438 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:56,438 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 98 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:59:56,444 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:56,444 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:56,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:56,517 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:56,583 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:57,462 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:57,482 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:59:57,496 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 99 with cvc4nyu --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 99 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:59:57,509 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:57,510 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:59:57,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:59:57,657 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:59:57,724 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:57,724 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:59:58,641 INFO L134 CoverageAnalysis]: Checked inductivity of 17860 backedges. 9004 proven. 4851 refuted. 0 times theorem prover too weak. 4005 trivial. 0 not checked. [2018-07-20 21:59:58,643 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:59:58,643 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52, 52, 52] total 52 [2018-07-20 21:59:58,643 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:59:58,644 INFO L450 AbstractCegarLoop]: Interpolant automaton has 52 states [2018-07-20 21:59:58,644 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2018-07-20 21:59:58,644 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:58,644 INFO L87 Difference]: Start difference. First operand 390 states and 436 transitions. Second operand 52 states. [2018-07-20 21:59:58,940 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:59:58,941 INFO L93 Difference]: Finished difference Result 628 states and 721 transitions. [2018-07-20 21:59:58,943 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-07-20 21:59:58,943 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 389 [2018-07-20 21:59:58,943 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:59:58,945 INFO L225 Difference]: With dead ends: 628 [2018-07-20 21:59:58,945 INFO L226 Difference]: Without dead ends: 438 [2018-07-20 21:59:58,946 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1606 GetRequests, 1456 SyntacticMatches, 100 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2450 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1326, Invalid=1326, Unknown=0, NotChecked=0, Total=2652 [2018-07-20 21:59:58,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 438 states. [2018-07-20 21:59:59,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 438 to 394. [2018-07-20 21:59:59,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 394 states. [2018-07-20 21:59:59,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 394 states to 394 states and 440 transitions. [2018-07-20 21:59:59,068 INFO L78 Accepts]: Start accepts. Automaton has 394 states and 440 transitions. Word has length 389 [2018-07-20 21:59:59,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:59:59,068 INFO L471 AbstractCegarLoop]: Abstraction has 394 states and 440 transitions. [2018-07-20 21:59:59,068 INFO L472 AbstractCegarLoop]: Interpolant automaton has 52 states. [2018-07-20 21:59:59,068 INFO L276 IsEmpty]: Start isEmpty. Operand 394 states and 440 transitions. [2018-07-20 21:59:59,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 394 [2018-07-20 21:59:59,069 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:59:59,070 INFO L358 BasicCegarLoop]: trace histogram [96, 96, 95, 50, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:59:59,070 INFO L414 AbstractCegarLoop]: === Iteration 53 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:59:59,070 INFO L82 PathProgramCache]: Analyzing trace with hash 1311651778, now seen corresponding path program 50 times [2018-07-20 21:59:59,070 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:59:59,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:59,071 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:59:59,071 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:59:59,071 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:59:59,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 22:00:00,686 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-07-20 22:00:00,687 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:00,687 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 22:00:00,687 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 22:00:00,687 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 22:00:00,687 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:00,687 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-07-20 22:00:00,702 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 22:00:00,702 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) Waiting until toolchain timeout for monitored process 100 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 22:00:00,797 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 22:00:00,797 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:00,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:00,909 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-07-20 22:00:00,909 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:02,651 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-07-20 22:00:02,671 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:02,671 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 101 with cvc4nyu --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 101 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 22:00:02,685 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 22:00:02,686 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 22:00:02,836 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 22:00:02,836 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:02,849 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:02,997 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9583 proven. 8476 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-07-20 22:00:02,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:04,548 INFO L134 CoverageAnalysis]: Checked inductivity of 18240 backedges. 9868 proven. 8191 refuted. 0 times theorem prover too weak. 181 trivial. 0 not checked. [2018-07-20 22:00:04,549 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 22:00:04,550 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53, 53, 52] total 58 [2018-07-20 22:00:04,550 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 22:00:04,550 INFO L450 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-07-20 22:00:04,550 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-07-20 22:00:04,551 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1603, Invalid=1703, Unknown=0, NotChecked=0, Total=3306 [2018-07-20 22:00:04,551 INFO L87 Difference]: Start difference. First operand 394 states and 440 transitions. Second operand 53 states. [2018-07-20 22:00:05,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 22:00:05,434 INFO L93 Difference]: Finished difference Result 1324 states and 1604 transitions. [2018-07-20 22:00:05,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-07-20 22:00:05,434 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 393 [2018-07-20 22:00:05,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 22:00:05,442 INFO L225 Difference]: With dead ends: 1324 [2018-07-20 22:00:05,442 INFO L226 Difference]: Without dead ends: 1319 [2018-07-20 22:00:05,442 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1669 GetRequests, 1427 SyntacticMatches, 186 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6215 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=1603, Invalid=1703, Unknown=0, NotChecked=0, Total=3306 [2018-07-20 22:00:05,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1319 states. [2018-07-20 22:00:05,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1319 to 414. [2018-07-20 22:00:05,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 414 states. [2018-07-20 22:00:05,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 414 states to 414 states and 465 transitions. [2018-07-20 22:00:05,638 INFO L78 Accepts]: Start accepts. Automaton has 414 states and 465 transitions. Word has length 393 [2018-07-20 22:00:05,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 22:00:05,639 INFO L471 AbstractCegarLoop]: Abstraction has 414 states and 465 transitions. [2018-07-20 22:00:05,639 INFO L472 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-07-20 22:00:05,639 INFO L276 IsEmpty]: Start isEmpty. Operand 414 states and 465 transitions. [2018-07-20 22:00:05,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 414 [2018-07-20 22:00:05,641 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 22:00:05,641 INFO L358 BasicCegarLoop]: trace histogram [101, 101, 100, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 22:00:05,642 INFO L414 AbstractCegarLoop]: === Iteration 54 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 22:00:05,642 INFO L82 PathProgramCache]: Analyzing trace with hash 2099862750, now seen corresponding path program 51 times [2018-07-20 22:00:05,642 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 22:00:05,642 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:05,643 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 22:00:05,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:05,643 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 22:00:05,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 22:00:07,256 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-07-20 22:00:07,256 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:07,256 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 22:00:07,256 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 22:00:07,256 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 22:00:07,256 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:07,256 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 102 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 22:00:07,262 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 22:00:07,263 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 22:00:07,381 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-07-20 22:00:07,381 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:07,386 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:07,577 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-07-20 22:00:07,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:08,081 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-07-20 22:00:08,100 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:08,100 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 103 with cvc4nyu --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 103 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 22:00:08,128 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 22:00:08,128 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 22:00:09,318 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 69 check-sat command(s) [2018-07-20 22:00:09,318 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:09,335 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:09,537 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-07-20 22:00:09,538 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:09,776 INFO L134 CoverageAnalysis]: Checked inductivity of 20200 backedges. 10198 proven. 5151 refuted. 0 times theorem prover too weak. 4851 trivial. 0 not checked. [2018-07-20 22:00:09,778 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 22:00:09,778 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 57, 57, 57, 57] total 59 [2018-07-20 22:00:09,778 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 22:00:09,779 INFO L450 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-07-20 22:00:09,779 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-07-20 22:00:09,779 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=3303, Unknown=0, NotChecked=0, Total=3422 [2018-07-20 22:00:09,779 INFO L87 Difference]: Start difference. First operand 414 states and 465 transitions. Second operand 57 states. [2018-07-20 22:00:17,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 22:00:17,033 INFO L93 Difference]: Finished difference Result 5825 states and 7252 transitions. [2018-07-20 22:00:17,036 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-07-20 22:00:17,036 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 413 [2018-07-20 22:00:17,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 22:00:17,058 INFO L225 Difference]: With dead ends: 5825 [2018-07-20 22:00:17,059 INFO L226 Difference]: Without dead ends: 5612 [2018-07-20 22:00:17,061 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1708 GetRequests, 1640 SyntacticMatches, 10 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=125, Invalid=3415, Unknown=0, NotChecked=0, Total=3540 [2018-07-20 22:00:17,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5612 states. [2018-07-20 22:00:21,626 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5612 to 5563. [2018-07-20 22:00:21,626 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5563 states. [2018-07-20 22:00:21,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5563 states to 5563 states and 5663 transitions. [2018-07-20 22:00:21,633 INFO L78 Accepts]: Start accepts. Automaton has 5563 states and 5663 transitions. Word has length 413 [2018-07-20 22:00:21,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 22:00:21,634 INFO L471 AbstractCegarLoop]: Abstraction has 5563 states and 5663 transitions. [2018-07-20 22:00:21,634 INFO L472 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-07-20 22:00:21,634 INFO L276 IsEmpty]: Start isEmpty. Operand 5563 states and 5663 transitions. [2018-07-20 22:00:21,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 418 [2018-07-20 22:00:21,636 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 22:00:21,636 INFO L358 BasicCegarLoop]: trace histogram [102, 102, 101, 52, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 22:00:21,636 INFO L414 AbstractCegarLoop]: === Iteration 55 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 22:00:21,637 INFO L82 PathProgramCache]: Analyzing trace with hash 1583456842, now seen corresponding path program 52 times [2018-07-20 22:00:21,637 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 22:00:21,637 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:21,637 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 22:00:21,638 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:21,638 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 22:00:21,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 22:00:23,306 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-07-20 22:00:23,306 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:23,335 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 22:00:23,335 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 22:00:23,335 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 22:00:23,336 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:23,336 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 104 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 22:00:23,343 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 22:00:23,343 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 22:00:23,422 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 22:00:23,422 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:23,428 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:23,572 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-07-20 22:00:23,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:25,519 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-07-20 22:00:25,539 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 22:00:25,539 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 105 with cvc4nyu --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 105 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 22:00:25,552 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 22:00:25,553 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 22:00:25,725 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 22:00:25,725 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 22:00:25,735 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 22:00:25,837 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-07-20 22:00:25,837 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 22:00:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 20604 backedges. 10504 proven. 9901 refuted. 0 times theorem prover too weak. 199 trivial. 0 not checked. [2018-07-20 22:00:27,609 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 22:00:27,609 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 54, 54, 54, 54] total 54 [2018-07-20 22:00:27,609 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 22:00:27,609 INFO L450 AbstractCegarLoop]: Interpolant automaton has 54 states [2018-07-20 22:00:27,610 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2018-07-20 22:00:27,610 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-07-20 22:00:27,610 INFO L87 Difference]: Start difference. First operand 5563 states and 5663 transitions. Second operand 54 states. [2018-07-20 22:00:33,804 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 22:00:33,804 INFO L93 Difference]: Finished difference Result 11127 states and 11328 transitions. [2018-07-20 22:00:33,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2018-07-20 22:00:33,836 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 417 [2018-07-20 22:00:33,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 22:00:33,851 INFO L225 Difference]: With dead ends: 11127 [2018-07-20 22:00:33,851 INFO L226 Difference]: Without dead ends: 5567 [2018-07-20 22:00:33,861 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 1770 GetRequests, 1514 SyntacticMatches, 204 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5800 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=1431, Invalid=1431, Unknown=0, NotChecked=0, Total=2862 [2018-07-20 22:00:33,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5567 states. [2018-07-20 22:00:38,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5567 to 5567. [2018-07-20 22:00:38,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 5567 states. [2018-07-20 22:00:38,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5567 states to 5567 states and 5667 transitions. [2018-07-20 22:00:38,541 INFO L78 Accepts]: Start accepts. Automaton has 5567 states and 5667 transitions. Word has length 417 [2018-07-20 22:00:38,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 22:00:38,541 INFO L471 AbstractCegarLoop]: Abstraction has 5567 states and 5667 transitions. [2018-07-20 22:00:38,541 INFO L472 AbstractCegarLoop]: Interpolant automaton has 54 states. [2018-07-20 22:00:38,541 INFO L276 IsEmpty]: Start isEmpty. Operand 5567 states and 5667 transitions. [2018-07-20 22:00:38,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 422 [2018-07-20 22:00:38,542 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 22:00:38,543 INFO L358 BasicCegarLoop]: trace histogram [103, 103, 102, 52, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 22:00:38,543 INFO L414 AbstractCegarLoop]: === Iteration 56 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 22:00:38,543 INFO L82 PathProgramCache]: Analyzing trace with hash -273634184, now seen corresponding path program 53 times [2018-07-20 22:00:38,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 22:00:38,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:38,544 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 22:00:38,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 22:00:38,544 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 22:00:38,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 22:00:39,665 INFO L134 CoverageAnalysis]: Checked inductivity of 21012 backedges. 15656 proven. 0 refuted. 0 times theorem prover too weak. 5356 trivial. 0 not checked. [2018-07-20 22:00:39,665 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 22:00:39,665 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [53] imperfect sequences [] total 53 [2018-07-20 22:00:39,666 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 22:00:39,666 INFO L450 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-07-20 22:00:39,666 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-07-20 22:00:39,666 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-07-20 22:00:39,666 INFO L87 Difference]: Start difference. First operand 5567 states and 5667 transitions. Second operand 53 states. [2018-07-20 22:00:39,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 22:00:39,858 INFO L93 Difference]: Finished difference Result 5567 states and 5667 transitions. [2018-07-20 22:00:39,858 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2018-07-20 22:00:39,858 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 421 [2018-07-20 22:00:39,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 22:00:39,859 INFO L225 Difference]: With dead ends: 5567 [2018-07-20 22:00:39,859 INFO L226 Difference]: Without dead ends: 0 [2018-07-20 22:00:39,867 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1378, Invalid=1378, Unknown=0, NotChecked=0, Total=2756 [2018-07-20 22:00:39,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2018-07-20 22:00:39,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2018-07-20 22:00:39,868 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2018-07-20 22:00:39,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2018-07-20 22:00:39,868 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 421 [2018-07-20 22:00:39,869 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 22:00:39,869 INFO L471 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2018-07-20 22:00:39,869 INFO L472 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-07-20 22:00:39,869 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2018-07-20 22:00:39,869 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2018-07-20 22:00:39,873 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2018-07-20 22:00:48,944 WARN L169 SmtUtils]: Spent 9.03 s on a formula simplification. DAG size of input: 1852 DAG size of output: 1441 [2018-07-20 22:01:06,626 WARN L169 SmtUtils]: Spent 17.60 s on a formula simplification. DAG size of input: 1420 DAG size of output: 509 [2018-07-20 22:01:06,632 INFO L421 ceAbstractionStarter]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2018-07-20 22:01:06,632 INFO L424 ceAbstractionStarter]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2018-07-20 22:01:06,632 INFO L424 ceAbstractionStarter]: At program point L-1(line -1) the Hoare annotation is: true [2018-07-20 22:01:06,632 INFO L424 ceAbstractionStarter]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2018-07-20 22:01:06,632 INFO L421 ceAbstractionStarter]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2018-07-20 22:01:06,632 INFO L421 ceAbstractionStarter]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2018-07-20 22:01:06,632 INFO L417 ceAbstractionStarter]: At program point L14'''(lines 14 22) the Hoare annotation is: (and (<= main_~x~0 100) (<= 100 main_~x~0)) [2018-07-20 22:01:06,635 INFO L417 ceAbstractionStarter]: At program point L14''(lines 14 22) the Hoare annotation is: (let ((.cse25 (<= main_~y~0 14)) (.cse24 (<= 14 main_~y~0)) (.cse3 (<= main_~y~0 7)) (.cse2 (<= 7 main_~y~0)) (.cse58 (<= 8 main_~y~0)) (.cse59 (<= main_~y~0 8)) (.cse43 (<= 39 main_~y~0)) (.cse42 (<= main_~y~0 39)) (.cse30 (<= main_~y~0 24)) (.cse31 (<= 24 main_~y~0)) (.cse53 (<= 47 main_~y~0)) (.cse52 (<= main_~y~0 47)) (.cse33 (<= main_~y~0 38)) (.cse32 (<= 38 main_~y~0)) (.cse55 (<= main_~y~0 23)) (.cse54 (<= 23 main_~y~0)) (.cse26 (<= main_~y~0 4)) (.cse27 (<= 4 main_~y~0)) (.cse62 (<= 0 main_~y~0)) (.cse63 (<= main_~y~0 0)) (.cse20 (<= 49 main_~y~0)) (.cse21 (<= main_~y~0 49)) (.cse44 (<= main_~y~0 13)) (.cse45 (<= 13 main_~y~0)) (.cse76 (<= main_~y~0 6)) (.cse77 (<= 6 main_~y~0)) (.cse14 (<= main_~y~0 45)) (.cse15 (<= 45 main_~y~0)) (.cse72 (<= main_~y~0 35)) (.cse73 (<= 35 main_~y~0)) (.cse70 (<= 22 main_~y~0)) (.cse71 (<= main_~y~0 22)) (.cse61 (<= main_~y~0 36)) (.cse60 (<= 36 main_~y~0)) (.cse6 (<= 48 main_~y~0)) (.cse7 (<= main_~y~0 48)) (.cse38 (<= main_~y~0 21)) (.cse39 (<= 21 main_~y~0)) (.cse49 (<= main_~y~0 9)) (.cse48 (<= 9 main_~y~0)) (.cse40 (<= 20 main_~y~0)) (.cse41 (<= main_~y~0 20)) (.cse57 (<= 5 main_~y~0)) (.cse56 (<= main_~y~0 5)) (.cse10 (<= main_~y~0 17)) (.cse11 (<= 17 main_~y~0)) (.cse87 (<= main_~y~0 26)) (.cse86 (<= 26 main_~y~0)) (.cse29 (<= 40 main_~y~0)) (.cse28 (<= main_~y~0 40)) (.cse18 (<= main_~y~0 10)) (.cse19 (<= 10 main_~y~0)) (.cse17 (<= main_~y~0 12)) (.cse16 (<= 12 main_~y~0)) (.cse88 (<= main_~y~0 29)) (.cse89 (<= 29 main_~y~0)) (.cse9 (<= main_~y~0 30)) (.cse8 (<= 30 main_~y~0)) (.cse90 (<= main_~y~0 2)) (.cse91 (<= 2 main_~y~0)) (.cse0 (<= 37 main_~y~0)) (.cse1 (<= main_~y~0 37)) (.cse80 (<= 31 main_~y~0)) (.cse81 (<= main_~y~0 31)) (.cse93 (<= 34 main_~y~0)) (.cse92 (<= main_~y~0 34)) (.cse94 (<= 19 main_~y~0)) (.cse95 (<= main_~y~0 19)) (.cse4 (<= 1 main_~y~0)) (.cse5 (<= main_~y~0 1)) (.cse96 (<= 32 main_~y~0)) (.cse97 (<= main_~y~0 32)) (.cse68 (<= 46 main_~y~0)) (.cse69 (<= main_~y~0 46)) (.cse84 (<= 18 main_~y~0)) (.cse85 (<= main_~y~0 18)) (.cse36 (<= main_~y~0 16)) (.cse37 (<= 16 main_~y~0)) (.cse23 (<= main_~y~0 3)) (.cse22 (<= 3 main_~y~0)) (.cse78 (<= 27 main_~y~0)) (.cse79 (<= main_~y~0 27)) (.cse34 (<= 44 main_~y~0)) (.cse35 (<= main_~y~0 44)) (.cse50 (<= 43 main_~y~0)) (.cse51 (<= main_~y~0 43)) (.cse99 (<= 25 main_~y~0)) (.cse98 (<= main_~y~0 25)) (.cse75 (<= main_~y~0 11)) (.cse74 (<= 11 main_~y~0)) (.cse64 (<= main_~y~0 42)) (.cse65 (<= 42 main_~y~0)) (.cse67 (<= main_~y~0 41)) (.cse66 (<= 41 main_~y~0)) (.cse13 (<= main_~y~0 33)) (.cse12 (<= 33 main_~y~0)) (.cse82 (<= main_~y~0 28)) (.cse83 (<= 28 main_~y~0)) (.cse46 (<= 15 main_~y~0)) (.cse47 (<= main_~y~0 15))) (or (and .cse0 (<= main_~x~0 37) (<= 37 main_~x~0) .cse1) (and .cse2 (<= 93 main_~x~0) .cse3 (<= main_~x~0 93)) (and (<= main_~y~0 50) (<= 50 main_~x~0) (<= main_~x~0 50) (<= 50 main_~y~0)) (and (<= main_~x~0 99) .cse4 .cse5 (<= 99 main_~x~0)) (and .cse6 .cse7 (<= main_~x~0 52) (<= 52 main_~x~0)) (and .cse8 (<= main_~x~0 70) .cse9 (<= 70 main_~x~0)) (and .cse10 (<= 83 main_~x~0) (<= main_~x~0 83) .cse11) (and .cse12 .cse13 (<= 67 main_~x~0) (<= main_~x~0 67)) (and (<= 45 main_~x~0) .cse14 .cse15 (<= main_~x~0 45)) (and (<= main_~x~0 88) (<= 88 main_~x~0) .cse16 .cse17) (and .cse18 .cse19 (<= main_~x~0 10) (<= 10 main_~x~0)) (and .cse20 (<= 49 main_~x~0) (<= main_~x~0 49) .cse21) (and .cse22 (<= 97 main_~x~0) .cse23 (<= main_~x~0 97)) (and .cse24 (<= main_~x~0 86) .cse25 (<= 86 main_~x~0)) (and .cse26 .cse27 (<= 4 main_~x~0) (<= main_~x~0 4)) (and (<= main_~x~0 40) .cse28 .cse29 (<= 40 main_~x~0)) (and .cse30 .cse31 (<= 76 main_~x~0) (<= main_~x~0 76)) (and .cse32 (<= main_~x~0 38) .cse33 (<= 38 main_~x~0)) (and (<= 44 main_~x~0) (<= main_~x~0 44) .cse34 .cse35) (and (<= main_~x~0 14) .cse25 (<= 14 main_~x~0) .cse24) (and .cse36 (<= 84 main_~x~0) .cse37 (<= main_~x~0 84)) (and .cse38 .cse39 (<= 21 main_~x~0) (<= main_~x~0 21)) (and .cse3 (<= main_~x~0 7) .cse2 (<= 7 main_~x~0)) (and (<= 20 main_~x~0) .cse40 .cse41 (<= main_~x~0 20)) (and (<= main_~x~0 39) (<= 39 main_~x~0) .cse42 .cse43) (and .cse44 (<= main_~x~0 87) (<= 87 main_~x~0) .cse45) (and (<= 15 main_~x~0) .cse46 .cse47 (<= main_~x~0 15)) (and (<= main_~x~0 91) (<= 91 main_~x~0) .cse48 .cse49) (and (<= 57 main_~x~0) .cse50 (<= main_~x~0 57) .cse51) (and .cse52 (<= 53 main_~x~0) .cse53 (<= main_~x~0 53)) (and .cse54 (<= main_~x~0 23) .cse55 (<= 23 main_~x~0)) (and (<= main_~x~0 95) .cse56 .cse57 (<= 95 main_~x~0)) (and (<= 8 main_~x~0) (<= main_~x~0 8) .cse58 .cse59) (and .cse60 .cse61 (<= main_~x~0 36) (<= 36 main_~x~0)) (and (<= main_~x~0 92) .cse58 .cse59 (<= 92 main_~x~0)) (and (<= main_~x~0 100) .cse62 (<= 100 main_~x~0) .cse63) (and .cse43 (<= 61 main_~x~0) .cse42 (<= main_~x~0 61)) (and (<= main_~x~0 24) .cse30 .cse31 (<= 24 main_~x~0)) (and (<= 58 main_~x~0) .cse64 (<= main_~x~0 58) .cse65) (and .cse53 .cse52 (<= main_~x~0 47) (<= 47 main_~x~0)) (and (<= 62 main_~x~0) (<= main_~x~0 62) .cse33 .cse32) (and .cse66 .cse67 (<= 59 main_~x~0) (<= main_~x~0 59)) (and .cse55 (<= 77 main_~x~0) (<= main_~x~0 77) .cse54) (and .cse26 (<= main_~x~0 96) .cse27 (<= 96 main_~x~0)) (and .cse68 (<= main_~x~0 46) (<= 46 main_~x~0) .cse69) (and (<= main_~x~0 78) .cse70 .cse71 (<= 78 main_~x~0)) (and (<= 35 main_~x~0) .cse72 .cse73 (<= main_~x~0 35)) (and .cse62 (<= main_~x~0 0) (<= 0 main_~x~0) .cse63) (and .cse74 .cse75 (<= 11 main_~x~0) (<= main_~x~0 11)) (and (<= main_~x~0 51) (<= 51 main_~x~0) .cse20 .cse21) (and .cse76 (<= main_~x~0 6) .cse77 (<= 6 main_~x~0)) (and (<= main_~x~0 73) (<= 73 main_~x~0) .cse78 .cse79) (and .cse44 (<= main_~x~0 13) (<= 13 main_~x~0) .cse45) (and .cse80 (<= main_~x~0 69) (<= 69 main_~x~0) .cse81) (and (<= 94 main_~x~0) .cse76 .cse77 (<= main_~x~0 94)) (and .cse14 .cse15 (<= main_~x~0 55) (<= 55 main_~x~0)) (and .cse72 (<= 65 main_~x~0) .cse73 (<= main_~x~0 65)) (and .cse70 (<= main_~x~0 22) .cse71 (<= 22 main_~x~0)) (and (<= main_~x~0 64) .cse61 (<= 64 main_~x~0) .cse60) (and .cse6 (<= 48 main_~x~0) (<= main_~x~0 48) .cse7) (and .cse38 .cse39 (<= main_~x~0 79) (<= 79 main_~x~0)) (and .cse82 (<= main_~x~0 28) (<= 28 main_~x~0) .cse83) (and (<= 9 main_~x~0) (<= main_~x~0 9) .cse49 .cse48) (and .cse84 .cse85 (<= 82 main_~x~0) (<= main_~x~0 82)) (and .cse40 (<= 80 main_~x~0) (<= main_~x~0 80) .cse41) (and .cse57 (<= 5 main_~x~0) .cse56 (<= main_~x~0 5)) (and (<= main_~x~0 26) .cse86 .cse87 (<= 26 main_~x~0)) (and (<= main_~x~0 17) .cse10 .cse11 (<= 17 main_~x~0)) (and (<= 74 main_~x~0) (<= main_~x~0 74) .cse87 .cse86) (and .cse29 .cse28 (<= main_~x~0 60) (<= 60 main_~x~0)) (and .cse18 .cse19 (<= 90 main_~x~0) (<= main_~x~0 90)) (and (<= main_~x~0 12) (<= 12 main_~x~0) .cse17 .cse16) (and .cse88 (<= 71 main_~x~0) .cse89 (<= main_~x~0 71)) (and (<= 2 main_~x~0) .cse90 (<= main_~x~0 2) .cse91) (and .cse88 (<= main_~x~0 29) (<= 29 main_~x~0) .cse89) (and (<= 30 main_~x~0) (<= main_~x~0 30) .cse9 .cse8) (and .cse90 (<= main_~x~0 98) .cse91 (<= 98 main_~x~0)) (and .cse92 (<= 66 main_~x~0) (<= main_~x~0 66) .cse93) (and .cse94 .cse95 (<= main_~x~0 19) (<= 19 main_~x~0)) (and (<= 63 main_~x~0) (<= main_~x~0 63) .cse0 .cse1) (and .cse80 (<= 31 main_~x~0) (<= main_~x~0 31) .cse81) (and .cse96 (<= main_~x~0 32) (<= 32 main_~x~0) .cse97) (and (<= 34 main_~x~0) (<= main_~x~0 34) .cse93 .cse92) (and (<= main_~x~0 75) (<= 75 main_~x~0) .cse98 .cse99) (and (<= main_~x~0 81) (<= 81 main_~x~0) .cse94 .cse95) (and .cse4 (<= main_~x~0 1) (<= 1 main_~x~0) .cse5) (and (<= 68 main_~x~0) .cse96 (<= main_~x~0 68) .cse97) (and (<= 54 main_~x~0) .cse68 (<= main_~x~0 54) .cse69) (and .cse84 (<= main_~x~0 18) .cse85 (<= 18 main_~x~0)) (and (<= main_~x~0 16) (<= 16 main_~x~0) .cse36 .cse37) (and (<= main_~x~0 3) .cse23 (<= 3 main_~x~0) .cse22) (and (<= main_~x~0 27) .cse78 .cse79 (<= 27 main_~x~0)) (and .cse34 (<= main_~x~0 56) .cse35 (<= 56 main_~x~0)) (and (<= 43 main_~x~0) .cse50 .cse51 (<= main_~x~0 43)) (and .cse99 (<= 25 main_~x~0) .cse98 (<= main_~x~0 25)) (and .cse75 .cse74 (<= 89 main_~x~0) (<= main_~x~0 89)) (and (<= main_~x~0 42) .cse64 .cse65 (<= 42 main_~x~0)) (and .cse67 .cse66 (<= 41 main_~x~0) (<= main_~x~0 41)) (and (<= main_~x~0 33) .cse13 .cse12 (<= 33 main_~x~0)) (and .cse82 (<= 72 main_~x~0) .cse83 (<= main_~x~0 72)) (and .cse46 .cse47 (<= main_~x~0 85) (<= 85 main_~x~0)))) [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point L23(line 23) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point L15''(lines 14 22) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point mainFINAL(lines 10 25) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point L14(lines 14 22) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point mainEXIT(lines 10 25) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L424 ceAbstractionStarter]: At program point mainENTRY(lines 10 25) the Hoare annotation is: true [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point L15(lines 15 19) no Hoare annotation was computed. [2018-07-20 22:01:06,635 INFO L424 ceAbstractionStarter]: At program point __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertENTRY(lines 3 8) the Hoare annotation is: true [2018-07-20 22:01:06,635 INFO L421 ceAbstractionStarter]: For program point L4(lines 4 6) no Hoare annotation was computed. [2018-07-20 22:01:06,636 INFO L421 ceAbstractionStarter]: For program point L5(line 5) no Hoare annotation was computed. [2018-07-20 22:01:06,636 INFO L421 ceAbstractionStarter]: For program point L4''(lines 3 8) no Hoare annotation was computed. [2018-07-20 22:01:06,636 INFO L421 ceAbstractionStarter]: For program point __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION(line 5) no Hoare annotation was computed. [2018-07-20 22:01:06,636 INFO L421 ceAbstractionStarter]: For program point __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_lit_gr_____true_unreach_call_true_termination_c_i____VERIFIER_assertEXIT(lines 3 8) no Hoare annotation was computed. [2018-07-20 22:01:06,673 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.07 10:01:06 BoogieIcfgContainer [2018-07-20 22:01:06,673 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-07-20 22:01:06,679 INFO L168 Benchmark]: Toolchain (without parser) took 198256.35 ms. Allocated memory was 309.3 MB in the beginning and 1.8 GB in the end (delta: 1.5 GB). Free memory was 255.8 MB in the beginning and 1.3 GB in the end (delta: -1.0 GB). Peak memory consumption was 1.4 GB. Max. memory is 5.3 GB. [2018-07-20 22:01:06,680 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 309.3 MB. Free memory is still 273.8 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-07-20 22:01:06,680 INFO L168 Benchmark]: CACSL2BoogieTranslator took 273.52 ms. Allocated memory is still 309.3 MB. Free memory was 253.8 MB in the beginning and 245.8 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. [2018-07-20 22:01:06,681 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.19 ms. Allocated memory is still 309.3 MB. Free memory was 245.8 MB in the beginning and 243.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. [2018-07-20 22:01:06,681 INFO L168 Benchmark]: Boogie Preprocessor took 28.98 ms. Allocated memory is still 309.3 MB. Free memory is still 243.8 MB. There was no memory consumed. Max. memory is 5.3 GB. [2018-07-20 22:01:06,681 INFO L168 Benchmark]: RCFGBuilder took 447.73 ms. Allocated memory was 309.3 MB in the beginning and 475.0 MB in the end (delta: 165.7 MB). Free memory was 243.8 MB in the beginning and 444.6 MB in the end (delta: -200.8 MB). Peak memory consumption was 24.6 MB. Max. memory is 5.3 GB. [2018-07-20 22:01:06,682 INFO L168 Benchmark]: TraceAbstraction took 197466.29 ms. Allocated memory was 475.0 MB in the beginning and 1.8 GB in the end (delta: 1.3 GB). Free memory was 444.6 MB in the beginning and 1.3 GB in the end (delta: -845.4 MB). Peak memory consumption was 1.4 GB. Max. memory is 5.3 GB. [2018-07-20 22:01:06,684 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 309.3 MB. Free memory is still 273.8 MB. There was no memory consumed. Max. memory is 5.3 GB. * CACSL2BoogieTranslator took 273.52 ms. Allocated memory is still 309.3 MB. Free memory was 253.8 MB in the beginning and 245.8 MB in the end (delta: 8.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 5.3 GB. * Boogie Procedure Inliner took 25.19 ms. Allocated memory is still 309.3 MB. Free memory was 245.8 MB in the beginning and 243.8 MB in the end (delta: 2.0 MB). Peak memory consumption was 2.0 MB. Max. memory is 5.3 GB. * Boogie Preprocessor took 28.98 ms. Allocated memory is still 309.3 MB. Free memory is still 243.8 MB. There was no memory consumed. Max. memory is 5.3 GB. * RCFGBuilder took 447.73 ms. Allocated memory was 309.3 MB in the beginning and 475.0 MB in the end (delta: 165.7 MB). Free memory was 243.8 MB in the beginning and 444.6 MB in the end (delta: -200.8 MB). Peak memory consumption was 24.6 MB. Max. memory is 5.3 GB. * TraceAbstraction took 197466.29 ms. Allocated memory was 475.0 MB in the beginning and 1.8 GB in the end (delta: 1.3 GB). Free memory was 444.6 MB in the beginning and 1.3 GB in the end (delta: -845.4 MB). Peak memory consumption was 1.4 GB. Max. memory is 5.3 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 5]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 14]: Loop Invariant Derived loop invariant: ((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((((37 <= y && x <= 37) && 37 <= x) && y <= 37) || (((7 <= y && 93 <= x) && y <= 7) && x <= 93)) || (((y <= 50 && 50 <= x) && x <= 50) && 50 <= y)) || (((x <= 99 && 1 <= y) && y <= 1) && 99 <= x)) || (((48 <= y && y <= 48) && x <= 52) && 52 <= x)) || (((30 <= y && x <= 70) && y <= 30) && 70 <= x)) || (((y <= 17 && 83 <= x) && x <= 83) && 17 <= y)) || (((33 <= y && y <= 33) && 67 <= x) && x <= 67)) || (((45 <= x && y <= 45) && 45 <= y) && x <= 45)) || (((x <= 88 && 88 <= x) && 12 <= y) && y <= 12)) || (((y <= 10 && 10 <= y) && x <= 10) && 10 <= x)) || (((49 <= y && 49 <= x) && x <= 49) && y <= 49)) || (((3 <= y && 97 <= x) && y <= 3) && x <= 97)) || (((14 <= y && x <= 86) && y <= 14) && 86 <= x)) || (((y <= 4 && 4 <= y) && 4 <= x) && x <= 4)) || (((x <= 40 && y <= 40) && 40 <= y) && 40 <= x)) || (((y <= 24 && 24 <= y) && 76 <= x) && x <= 76)) || (((38 <= y && x <= 38) && y <= 38) && 38 <= x)) || (((44 <= x && x <= 44) && 44 <= y) && y <= 44)) || (((x <= 14 && y <= 14) && 14 <= x) && 14 <= y)) || (((y <= 16 && 84 <= x) && 16 <= y) && x <= 84)) || (((y <= 21 && 21 <= y) && 21 <= x) && x <= 21)) || (((y <= 7 && x <= 7) && 7 <= y) && 7 <= x)) || (((20 <= x && 20 <= y) && y <= 20) && x <= 20)) || (((x <= 39 && 39 <= x) && y <= 39) && 39 <= y)) || (((y <= 13 && x <= 87) && 87 <= x) && 13 <= y)) || (((15 <= x && 15 <= y) && y <= 15) && x <= 15)) || (((x <= 91 && 91 <= x) && 9 <= y) && y <= 9)) || (((57 <= x && 43 <= y) && x <= 57) && y <= 43)) || (((y <= 47 && 53 <= x) && 47 <= y) && x <= 53)) || (((23 <= y && x <= 23) && y <= 23) && 23 <= x)) || (((x <= 95 && y <= 5) && 5 <= y) && 95 <= x)) || (((8 <= x && x <= 8) && 8 <= y) && y <= 8)) || (((36 <= y && y <= 36) && x <= 36) && 36 <= x)) || (((x <= 92 && 8 <= y) && y <= 8) && 92 <= x)) || (((x <= 100 && 0 <= y) && 100 <= x) && y <= 0)) || (((39 <= y && 61 <= x) && y <= 39) && x <= 61)) || (((x <= 24 && y <= 24) && 24 <= y) && 24 <= x)) || (((58 <= x && y <= 42) && x <= 58) && 42 <= y)) || (((47 <= y && y <= 47) && x <= 47) && 47 <= x)) || (((62 <= x && x <= 62) && y <= 38) && 38 <= y)) || (((41 <= y && y <= 41) && 59 <= x) && x <= 59)) || (((y <= 23 && 77 <= x) && x <= 77) && 23 <= y)) || (((y <= 4 && x <= 96) && 4 <= y) && 96 <= x)) || (((46 <= y && x <= 46) && 46 <= x) && y <= 46)) || (((x <= 78 && 22 <= y) && y <= 22) && 78 <= x)) || (((35 <= x && y <= 35) && 35 <= y) && x <= 35)) || (((0 <= y && x <= 0) && 0 <= x) && y <= 0)) || (((11 <= y && y <= 11) && 11 <= x) && x <= 11)) || (((x <= 51 && 51 <= x) && 49 <= y) && y <= 49)) || (((y <= 6 && x <= 6) && 6 <= y) && 6 <= x)) || (((x <= 73 && 73 <= x) && 27 <= y) && y <= 27)) || (((y <= 13 && x <= 13) && 13 <= x) && 13 <= y)) || (((31 <= y && x <= 69) && 69 <= x) && y <= 31)) || (((94 <= x && y <= 6) && 6 <= y) && x <= 94)) || (((y <= 45 && 45 <= y) && x <= 55) && 55 <= x)) || (((y <= 35 && 65 <= x) && 35 <= y) && x <= 65)) || (((22 <= y && x <= 22) && y <= 22) && 22 <= x)) || (((x <= 64 && y <= 36) && 64 <= x) && 36 <= y)) || (((48 <= y && 48 <= x) && x <= 48) && y <= 48)) || (((y <= 21 && 21 <= y) && x <= 79) && 79 <= x)) || (((y <= 28 && x <= 28) && 28 <= x) && 28 <= y)) || (((9 <= x && x <= 9) && y <= 9) && 9 <= y)) || (((18 <= y && y <= 18) && 82 <= x) && x <= 82)) || (((20 <= y && 80 <= x) && x <= 80) && y <= 20)) || (((5 <= y && 5 <= x) && y <= 5) && x <= 5)) || (((x <= 26 && 26 <= y) && y <= 26) && 26 <= x)) || (((x <= 17 && y <= 17) && 17 <= y) && 17 <= x)) || (((74 <= x && x <= 74) && y <= 26) && 26 <= y)) || (((40 <= y && y <= 40) && x <= 60) && 60 <= x)) || (((y <= 10 && 10 <= y) && 90 <= x) && x <= 90)) || (((x <= 12 && 12 <= x) && y <= 12) && 12 <= y)) || (((y <= 29 && 71 <= x) && 29 <= y) && x <= 71)) || (((2 <= x && y <= 2) && x <= 2) && 2 <= y)) || (((y <= 29 && x <= 29) && 29 <= x) && 29 <= y)) || (((30 <= x && x <= 30) && y <= 30) && 30 <= y)) || (((y <= 2 && x <= 98) && 2 <= y) && 98 <= x)) || (((y <= 34 && 66 <= x) && x <= 66) && 34 <= y)) || (((19 <= y && y <= 19) && x <= 19) && 19 <= x)) || (((63 <= x && x <= 63) && 37 <= y) && y <= 37)) || (((31 <= y && 31 <= x) && x <= 31) && y <= 31)) || (((32 <= y && x <= 32) && 32 <= x) && y <= 32)) || (((34 <= x && x <= 34) && 34 <= y) && y <= 34)) || (((x <= 75 && 75 <= x) && y <= 25) && 25 <= y)) || (((x <= 81 && 81 <= x) && 19 <= y) && y <= 19)) || (((1 <= y && x <= 1) && 1 <= x) && y <= 1)) || (((68 <= x && 32 <= y) && x <= 68) && y <= 32)) || (((54 <= x && 46 <= y) && x <= 54) && y <= 46)) || (((18 <= y && x <= 18) && y <= 18) && 18 <= x)) || (((x <= 16 && 16 <= x) && y <= 16) && 16 <= y)) || (((x <= 3 && y <= 3) && 3 <= x) && 3 <= y)) || (((x <= 27 && 27 <= y) && y <= 27) && 27 <= x)) || (((44 <= y && x <= 56) && y <= 44) && 56 <= x)) || (((43 <= x && 43 <= y) && y <= 43) && x <= 43)) || (((25 <= y && 25 <= x) && y <= 25) && x <= 25)) || (((y <= 11 && 11 <= y) && 89 <= x) && x <= 89)) || (((x <= 42 && y <= 42) && 42 <= y) && 42 <= x)) || (((y <= 41 && 41 <= y) && 41 <= x) && x <= 41)) || (((x <= 33 && y <= 33) && 33 <= y) && 33 <= x)) || (((y <= 28 && 72 <= x) && 28 <= y) && x <= 72)) || (((15 <= y && y <= 15) && x <= 85) && 85 <= x) - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. SAFE Result, 197.3s OverallTime, 56 OverallIterations, 103 TraceHistogramMax, 25.9s AutomataDifference, 0.0s DeadEndRemovalTime, 26.7s HoareAnnotationTime, HoareTripleCheckerStatistics: 1384 SDtfs, 1336 SDslu, 23499 SDs, 0 SdLazy, 13885 SolverSat, 1211 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 9.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 44693 GetRequests, 40301 SyntacticMatches, 1828 SemanticMatches, 2564 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73231 ImplicationChecksByTransitivity, 94.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=5567occurred in iteration=55, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 1 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 11.4s AutomataMinimizationTime, 56 MinimizatonAttempts, 4315 StatesRemovedByMinimization, 52 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 63 PreInvPairs, 165 NumberOfFragments, 1326 HoareAnnotationTreeSize, 63 FomulaSimplifications, 13241479 FormulaSimplificationTreeSizeReduction, 9.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 6324089 FormulaSimplificationTreeSizeReductionInter, 17.6s HoareSimplificationTimeInter, RefinementEngineStatistics: TraceCheckStatistics: 1.2s SsaConstructionTime, 23.7s SatisfiabilityAnalysisTime, 103.3s InterpolantComputationTime, 32581 NumberOfCodeBlocks, 32213 NumberOfCodeBlocksAsserted, 2508 NumberOfCheckSat, 53733 ConstructedInterpolants, 0 QuantifiedInterpolants, 33596809 SizeOfPredicates, 108 NumberOfNonLiveVariables, 42408 ConjunctsInSsa, 3362 ConjunctsInUnsatCore, 264 InterpolantComputations, 4 PerfectInterpolantSequences, 1168605/1695372 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/gr2006_true-unreach-call_true-termination.c.i_svcomp-Reach-64bit-Taipan_Default.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-07-20_22-01-06-697.csv Written .csv to /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../releaseScripts/default/UAutomizer-linux/csv/gr2006_true-unreach-call_true-termination.c.i_svcomp-Reach-64bit-Taipan_Default.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-07-20_22-01-06-697.csv Received shutdown request...