java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data --generate-csv --csv-dir csv -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf -i ../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-3142e50-m [2018-09-10 10:09:11,953 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-10 10:09:11,955 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-10 10:09:11,970 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-10 10:09:11,971 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-10 10:09:11,973 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-10 10:09:11,974 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-10 10:09:11,977 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-10 10:09:11,981 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-10 10:09:11,984 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-10 10:09:11,985 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-10 10:09:11,985 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-10 10:09:11,987 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-10 10:09:11,989 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-10 10:09:11,996 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-10 10:09:11,997 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-10 10:09:12,001 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-10 10:09:12,006 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-10 10:09:12,008 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-10 10:09:12,012 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-10 10:09:12,014 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-10 10:09:12,017 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-10 10:09:12,021 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-10 10:09:12,022 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-10 10:09:12,022 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-10 10:09:12,023 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-10 10:09:12,024 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-10 10:09:12,026 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-10 10:09:12,027 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-10 10:09:12,031 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-10 10:09:12,031 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-10 10:09:12,032 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-10 10:09:12,032 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-10 10:09:12,034 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-10 10:09:12,035 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-10 10:09:12,036 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-10 10:09:12,037 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/ai/taipanbench/svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf [2018-09-10 10:09:12,067 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-10 10:09:12,067 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-10 10:09:12,068 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-10 10:09:12,068 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-10 10:09:12,069 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-10 10:09:12,069 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-10 10:09:12,069 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-10 10:09:12,069 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-10 10:09:12,070 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-10 10:09:12,070 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-10 10:09:12,070 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-10 10:09:12,071 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-10 10:09:12,071 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-10 10:09:12,071 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-10 10:09:12,072 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-10 10:09:12,073 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-10 10:09:12,073 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-10 10:09:12,073 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-10 10:09:12,073 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-10 10:09:12,075 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-10 10:09:12,075 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-10 10:09:12,075 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-10 10:09:12,075 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-10 10:09:12,075 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-10 10:09:12,076 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-10 10:09:12,076 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-10 10:09:12,076 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-10 10:09:12,076 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-10 10:09:12,076 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-10 10:09:12,077 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-10 10:09:12,077 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-10 10:09:12,077 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-10 10:09:12,077 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-10 10:09:12,146 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-10 10:09:12,160 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-10 10:09:12,166 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-10 10:09:12,168 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-10 10:09:12,169 INFO L276 PluginConnector]: CDTParser initialized [2018-09-10 10:09:12,170 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-09-10 10:09:12,527 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46f9dc3db/2defe4fda5384dd6b51d6cf4bf522ff7/FLAG2044f5285 [2018-09-10 10:09:12,663 INFO L276 CDTParser]: Found 1 translation units. [2018-09-10 10:09:12,664 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/diamond_true-unreach-call1_true-termination.i [2018-09-10 10:09:12,670 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46f9dc3db/2defe4fda5384dd6b51d6cf4bf522ff7/FLAG2044f5285 [2018-09-10 10:09:12,687 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/46f9dc3db/2defe4fda5384dd6b51d6cf4bf522ff7 [2018-09-10 10:09:12,700 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-10 10:09:12,703 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-10 10:09:12,704 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-10 10:09:12,705 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-10 10:09:12,711 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-10 10:09:12,713 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:12,716 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@621ab4fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12, skipping insertion in model container [2018-09-10 10:09:12,716 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:12,897 INFO L180 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-09-10 10:09:12,941 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:09:12,962 INFO L431 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-10 10:09:12,968 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:09:12,986 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12 WrapperNode [2018-09-10 10:09:12,986 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-10 10:09:12,987 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-10 10:09:12,987 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-10 10:09:12,987 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-10 10:09:12,997 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,004 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,012 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-10 10:09:13,013 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-10 10:09:13,013 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-10 10:09:13,013 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-10 10:09:13,024 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,024 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,025 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,026 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,032 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,040 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,047 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... [2018-09-10 10:09:13,049 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-10 10:09:13,051 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-10 10:09:13,052 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-10 10:09:13,052 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-10 10:09:13,053 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (1/1) ... No working directory specified, using /storage/repos/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 [2018-09-10 10:09:13,128 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-10 10:09:13,128 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-10 10:09:13,128 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assert [2018-09-10 10:09:13,129 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assert [2018-09-10 10:09:13,129 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-10 10:09:13,129 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-10 10:09:13,129 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-10 10:09:13,129 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-10 10:09:13,510 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-10 10:09:13,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:09:13 BoogieIcfgContainer [2018-09-10 10:09:13,511 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-10 10:09:13,512 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-10 10:09:13,512 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-10 10:09:13,516 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-10 10:09:13,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 10:09:12" (1/3) ... [2018-09-10 10:09:13,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@166e91e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:09:13, skipping insertion in model container [2018-09-10 10:09:13,517 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:09:12" (2/3) ... [2018-09-10 10:09:13,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@166e91e0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:09:13, skipping insertion in model container [2018-09-10 10:09:13,518 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:09:13" (3/3) ... [2018-09-10 10:09:13,519 INFO L112 eAbstractionObserver]: Analyzing ICFG diamond_true-unreach-call1_true-termination.i [2018-09-10 10:09:13,530 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-10 10:09:13,538 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-10 10:09:13,589 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-10 10:09:13,590 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-10 10:09:13,591 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-10 10:09:13,591 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-10 10:09:13,591 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-10 10:09:13,591 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-10 10:09:13,591 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-10 10:09:13,591 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-10 10:09:13,592 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-10 10:09:13,613 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-09-10 10:09:13,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-10 10:09:13,619 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:13,620 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:13,621 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:13,627 INFO L82 PathProgramCache]: Analyzing trace with hash 2038308009, now seen corresponding path program 1 times [2018-09-10 10:09:13,630 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:13,684 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:13,684 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:13,685 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:13,685 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:13,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:13,747 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:13,749 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:09:13,750 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-10 10:09:13,750 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:09:13,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-10 10:09:13,766 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-10 10:09:13,767 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-10 10:09:13,769 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-09-10 10:09:13,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:13,793 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-09-10 10:09:13,793 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-10 10:09:13,795 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-10 10:09:13,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:13,804 INFO L225 Difference]: With dead ends: 30 [2018-09-10 10:09:13,804 INFO L226 Difference]: Without dead ends: 13 [2018-09-10 10:09:13,808 INFO L604 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 [2018-09-10 10:09:13,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-09-10 10:09:13,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-09-10 10:09:13,850 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-09-10 10:09:13,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-09-10 10:09:13,854 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-09-10 10:09:13,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:13,855 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-09-10 10:09:13,855 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-10 10:09:13,855 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-09-10 10:09:13,856 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-10 10:09:13,856 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:13,857 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:13,857 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:13,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1653203952, now seen corresponding path program 1 times [2018-09-10 10:09:13,858 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:13,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:13,859 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:13,859 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:13,859 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:13,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,089 WARN L175 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 5 [2018-09-10 10:09:14,109 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,109 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:09:14,109 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-10 10:09:14,109 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:09:14,111 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-10 10:09:14,112 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-10 10:09:14,112 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:09:14,112 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-09-10 10:09:14,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:14,165 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2018-09-10 10:09:14,166 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-10 10:09:14,166 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-10 10:09:14,166 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:14,169 INFO L225 Difference]: With dead ends: 21 [2018-09-10 10:09:14,169 INFO L226 Difference]: Without dead ends: 16 [2018-09-10 10:09:14,170 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:09:14,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-10 10:09:14,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2018-09-10 10:09:14,175 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2018-09-10 10:09:14,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2018-09-10 10:09:14,176 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2018-09-10 10:09:14,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:14,177 INFO L480 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2018-09-10 10:09:14,177 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-10 10:09:14,177 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2018-09-10 10:09:14,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-10 10:09:14,178 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:14,178 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:14,178 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:14,179 INFO L82 PathProgramCache]: Analyzing trace with hash 862972002, now seen corresponding path program 1 times [2018-09-10 10:09:14,179 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:14,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:14,180 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:14,180 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:14,180 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:14,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,321 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,321 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:14,322 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:14,333 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:14,334 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:14,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,362 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:14,394 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:14,504 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,525 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:14,526 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:14,543 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:14,543 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:14,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,566 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:14,585 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:14,639 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,643 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:14,643 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-10 10:09:14,644 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:14,644 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-10 10:09:14,645 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-10 10:09:14,645 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:09:14,646 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 4 states. [2018-09-10 10:09:14,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:14,768 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2018-09-10 10:09:14,769 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-10 10:09:14,769 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-09-10 10:09:14,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:14,771 INFO L225 Difference]: With dead ends: 24 [2018-09-10 10:09:14,771 INFO L226 Difference]: Without dead ends: 19 [2018-09-10 10:09:14,772 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:09:14,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-09-10 10:09:14,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2018-09-10 10:09:14,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-10 10:09:14,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-09-10 10:09:14,777 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-09-10 10:09:14,777 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:14,777 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-09-10 10:09:14,777 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-10 10:09:14,777 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-09-10 10:09:14,778 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-09-10 10:09:14,778 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:14,778 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:14,779 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:14,779 INFO L82 PathProgramCache]: Analyzing trace with hash -1656987932, now seen corresponding path program 1 times [2018-09-10 10:09:14,779 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:14,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:14,780 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:14,780 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:14,781 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:14,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,883 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:14,883 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:14,883 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:14,902 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:14,902 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:14,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:14,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:15,009 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,009 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:15,122 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,143 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:15,143 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:15,161 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:15,161 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:15,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:15,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:15,210 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,210 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:15,221 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,223 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:15,224 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-10 10:09:15,224 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:15,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-10 10:09:15,225 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-10 10:09:15,225 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:09:15,226 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2018-09-10 10:09:15,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:15,295 INFO L93 Difference]: Finished difference Result 26 states and 29 transitions. [2018-09-10 10:09:15,295 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-10 10:09:15,295 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-09-10 10:09:15,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:15,296 INFO L225 Difference]: With dead ends: 26 [2018-09-10 10:09:15,296 INFO L226 Difference]: Without dead ends: 21 [2018-09-10 10:09:15,297 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 52 SyntacticMatches, 3 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:09:15,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2018-09-10 10:09:15,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2018-09-10 10:09:15,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-10 10:09:15,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2018-09-10 10:09:15,303 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2018-09-10 10:09:15,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:15,304 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2018-09-10 10:09:15,304 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-10 10:09:15,304 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2018-09-10 10:09:15,305 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-10 10:09:15,305 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:15,305 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:15,305 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:15,306 INFO L82 PathProgramCache]: Analyzing trace with hash 196600528, now seen corresponding path program 2 times [2018-09-10 10:09:15,306 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:15,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:15,307 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:15,307 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:15,307 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:15,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:15,415 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,415 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:15,415 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:15,432 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:09:15,432 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:15,447 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:09:15,447 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:15,449 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:15,471 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:15,689 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,710 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:15,710 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:15,726 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:09:15,726 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:15,752 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:09:15,752 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:15,756 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:15,781 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,781 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:15,826 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:15,831 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:15,831 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-10 10:09:15,832 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:15,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-10 10:09:15,836 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-10 10:09:15,837 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:09:15,837 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2018-09-10 10:09:15,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:15,994 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2018-09-10 10:09:15,995 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-10 10:09:15,995 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-09-10 10:09:15,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:15,996 INFO L225 Difference]: With dead ends: 29 [2018-09-10 10:09:15,996 INFO L226 Difference]: Without dead ends: 24 [2018-09-10 10:09:15,997 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:09:15,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-10 10:09:16,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2018-09-10 10:09:16,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-09-10 10:09:16,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 24 transitions. [2018-09-10 10:09:16,003 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 24 transitions. Word has length 17 [2018-09-10 10:09:16,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:16,003 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 24 transitions. [2018-09-10 10:09:16,004 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-10 10:09:16,004 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 24 transitions. [2018-09-10 10:09:16,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-10 10:09:16,005 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:16,006 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:16,006 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:16,006 INFO L82 PathProgramCache]: Analyzing trace with hash 1971607890, now seen corresponding path program 1 times [2018-09-10 10:09:16,006 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:16,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:16,008 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:16,008 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:16,008 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:16,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:18,111 WARN L175 SmtUtils]: Spent 2.03 s on a formula simplification. DAG size of input: 27 DAG size of output: 12 [2018-09-10 10:09:18,114 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:18,114 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:09:18,114 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-10 10:09:18,115 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:09:18,115 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-10 10:09:18,115 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-10 10:09:18,116 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:09:18,116 INFO L87 Difference]: Start difference. First operand 21 states and 24 transitions. Second operand 3 states. [2018-09-10 10:09:18,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:18,131 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2018-09-10 10:09:18,134 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-10 10:09:18,134 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-09-10 10:09:18,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:18,135 INFO L225 Difference]: With dead ends: 35 [2018-09-10 10:09:18,136 INFO L226 Difference]: Without dead ends: 27 [2018-09-10 10:09:18,136 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:09:18,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-09-10 10:09:18,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2018-09-10 10:09:18,142 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-10 10:09:18,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2018-09-10 10:09:18,143 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2018-09-10 10:09:18,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:18,143 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2018-09-10 10:09:18,144 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-10 10:09:18,144 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2018-09-10 10:09:18,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-10 10:09:18,145 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:18,145 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:18,145 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:18,145 INFO L82 PathProgramCache]: Analyzing trace with hash -196426482, now seen corresponding path program 2 times [2018-09-10 10:09:18,146 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:18,146 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:18,147 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:18,147 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:18,147 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:18,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:20,181 WARN L1010 $PredicateComparison]: unable to prove that (let ((.cse4 (div c_main_~y~0 2))) (let ((.cse1 (* 2 .cse4))) (let ((.cse2 (* (- 2) .cse4)) (.cse0 (= .cse1 c_main_~y~0)) (.cse3 (* 4294967296 (div c_main_~y~0 4294967296)))) (and (or .cse0 (not (= (+ .cse1 (* 4294967296 (div (+ c_main_~y~0 .cse2 (- 2)) 4294967296)) 2) c_main_~y~0)) (<= .cse3 c_main_~y~0)) (or (not (= (+ .cse1 (* 4294967296 (div (+ c_main_~y~0 .cse2) 4294967296))) c_main_~y~0)) (and (not .cse0) (< c_main_~y~0 .cse3))))))) is different from false [2018-09-10 10:09:20,186 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,186 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:09:20,187 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-10 10:09:20,187 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:09:20,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-10 10:09:20,188 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-10 10:09:20,188 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=2, Unknown=1, NotChecked=0, Total=6 [2018-09-10 10:09:20,188 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 3 states. [2018-09-10 10:09:20,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:20,193 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-09-10 10:09:20,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-10 10:09:20,193 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-09-10 10:09:20,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:20,194 INFO L225 Difference]: With dead ends: 34 [2018-09-10 10:09:20,194 INFO L226 Difference]: Without dead ends: 26 [2018-09-10 10:09:20,195 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=3, Invalid=2, Unknown=1, NotChecked=0, Total=6 [2018-09-10 10:09:20,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-10 10:09:20,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-10 10:09:20,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-10 10:09:20,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2018-09-10 10:09:20,201 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 17 [2018-09-10 10:09:20,202 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:20,202 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2018-09-10 10:09:20,202 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-10 10:09:20,202 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2018-09-10 10:09:20,203 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-10 10:09:20,203 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:20,203 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:20,203 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:20,204 INFO L82 PathProgramCache]: Analyzing trace with hash 1578580880, now seen corresponding path program 2 times [2018-09-10 10:09:20,204 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:20,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:20,205 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:20,205 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:20,205 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:20,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:20,374 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,374 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:20,375 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:20,383 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:09:20,384 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:20,400 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:09:20,400 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:20,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:20,451 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,452 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:20,831 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,852 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:20,852 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:20,868 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:09:20,869 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:20,891 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:09:20,892 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:20,895 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:20,912 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,912 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:20,923 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:20,926 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:20,926 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-10 10:09:20,926 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:20,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-10 10:09:20,927 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-10 10:09:20,927 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:09:20,928 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 5 states. [2018-09-10 10:09:21,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:21,003 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2018-09-10 10:09:21,005 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-10 10:09:21,006 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2018-09-10 10:09:21,006 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:21,007 INFO L225 Difference]: With dead ends: 35 [2018-09-10 10:09:21,007 INFO L226 Difference]: Without dead ends: 30 [2018-09-10 10:09:21,007 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 63 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:09:21,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-10 10:09:21,012 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-09-10 10:09:21,013 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-09-10 10:09:21,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-09-10 10:09:21,014 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 17 [2018-09-10 10:09:21,014 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:21,014 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-09-10 10:09:21,014 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-10 10:09:21,015 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-09-10 10:09:21,015 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-10 10:09:21,015 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:21,016 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:21,016 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:21,016 INFO L82 PathProgramCache]: Analyzing trace with hash -337139294, now seen corresponding path program 3 times [2018-09-10 10:09:21,016 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:21,017 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:21,017 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:21,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:21,018 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:21,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:21,225 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:21,225 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:21,225 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:21,236 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:09:21,236 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:09:21,255 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-10 10:09:21,255 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:21,257 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:21,275 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:21,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:21,716 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:21,736 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:21,736 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:21,752 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:09:21,752 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:09:21,805 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-10 10:09:21,805 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:21,809 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:21,822 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:21,823 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:21,834 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:21,836 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:21,836 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-10 10:09:21,836 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:21,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-10 10:09:21,837 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-10 10:09:21,837 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-10 10:09:21,838 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 6 states. [2018-09-10 10:09:21,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:21,923 INFO L93 Difference]: Finished difference Result 38 states and 40 transitions. [2018-09-10 10:09:21,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-10 10:09:21,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-09-10 10:09:21,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:21,926 INFO L225 Difference]: With dead ends: 38 [2018-09-10 10:09:21,926 INFO L226 Difference]: Without dead ends: 33 [2018-09-10 10:09:21,927 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 74 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-10 10:09:21,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-09-10 10:09:21,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2018-09-10 10:09:21,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-10 10:09:21,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2018-09-10 10:09:21,934 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 20 [2018-09-10 10:09:21,934 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:21,934 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2018-09-10 10:09:21,934 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-10 10:09:21,935 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2018-09-10 10:09:21,935 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-09-10 10:09:21,935 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:21,936 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:21,936 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:21,936 INFO L82 PathProgramCache]: Analyzing trace with hash 458035044, now seen corresponding path program 3 times [2018-09-10 10:09:21,936 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:21,937 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:21,937 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:21,938 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:21,938 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:21,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:22,065 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:22,066 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:22,066 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/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 [2018-09-10 10:09:22,074 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:09:22,074 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:09:34,109 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-09-10 10:09:34,110 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:34,112 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:36,519 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-09-10 10:09:36,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:49,076 WARN L175 SmtUtils]: Spent 4.04 s on a formula simplification. DAG size of input: 43 DAG size of output: 19 [2018-09-10 10:09:51,109 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-09-10 10:09:51,129 INFO L313 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-09-10 10:09:51,130 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [7, 7] imperfect sequences [6] total 16 [2018-09-10 10:09:51,130 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:09:51,130 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-10 10:09:51,130 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-10 10:09:51,131 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=188, Unknown=2, NotChecked=0, Total=240 [2018-09-10 10:09:51,131 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 7 states. [2018-09-10 10:09:51,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:51,218 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2018-09-10 10:09:51,219 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-10 10:09:51,219 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 20 [2018-09-10 10:09:51,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:51,220 INFO L225 Difference]: With dead ends: 37 [2018-09-10 10:09:51,220 INFO L226 Difference]: Without dead ends: 24 [2018-09-10 10:09:51,221 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=62, Invalid=242, Unknown=2, NotChecked=0, Total=306 [2018-09-10 10:09:51,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-10 10:09:51,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-10 10:09:51,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-10 10:09:51,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-10 10:09:51,227 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 20 [2018-09-10 10:09:51,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:51,227 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-10 10:09:51,227 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-10 10:09:51,228 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-10 10:09:51,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-10 10:09:51,228 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:51,228 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:51,229 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:51,229 INFO L82 PathProgramCache]: Analyzing trace with hash -1011246704, now seen corresponding path program 4 times [2018-09-10 10:09:51,229 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:51,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:51,230 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:51,230 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:51,231 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:51,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:51,377 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:51,377 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:51,377 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:09:51,388 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:09:51,388 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:09:51,404 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:09:51,404 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:51,406 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:51,424 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:51,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:53,343 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:53,362 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:53,363 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 14 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 14 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:09:53,378 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:09:53,379 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:09:53,400 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:09:53,401 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:53,404 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:53,410 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:53,411 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:53,439 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:53,441 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:53,441 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-10 10:09:53,441 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:53,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-10 10:09:53,442 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-10 10:09:53,442 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-10 10:09:53,442 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 7 states. [2018-09-10 10:09:53,512 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:53,512 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-10 10:09:53,512 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-10 10:09:53,513 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2018-09-10 10:09:53,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:53,514 INFO L225 Difference]: With dead ends: 33 [2018-09-10 10:09:53,514 INFO L226 Difference]: Without dead ends: 28 [2018-09-10 10:09:53,515 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 85 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-10 10:09:53,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-10 10:09:53,520 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2018-09-10 10:09:53,521 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2018-09-10 10:09:53,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2018-09-10 10:09:53,521 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 23 [2018-09-10 10:09:53,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:53,522 INFO L480 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2018-09-10 10:09:53,522 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-10 10:09:53,522 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2018-09-10 10:09:53,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2018-09-10 10:09:53,523 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:53,524 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:53,524 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:53,524 INFO L82 PathProgramCache]: Analyzing trace with hash -78021918, now seen corresponding path program 5 times [2018-09-10 10:09:53,524 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:53,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:53,525 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:53,525 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:53,525 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:53,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:53,696 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:53,697 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:53,697 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:09:53,707 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:09:53,707 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:53,746 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-10 10:09:53,746 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:53,748 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:53,760 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:53,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:54,673 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:54,693 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:54,693 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 16 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 16 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:09:54,709 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:09:54,710 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:54,763 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-10 10:09:54,764 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:54,767 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:54,783 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:54,783 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:54,804 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:54,806 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:54,806 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-10 10:09:54,806 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:54,806 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-10 10:09:54,807 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-10 10:09:54,807 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-10 10:09:54,807 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 8 states. [2018-09-10 10:09:54,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:54,895 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2018-09-10 10:09:54,901 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-10 10:09:54,901 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2018-09-10 10:09:54,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:54,902 INFO L225 Difference]: With dead ends: 36 [2018-09-10 10:09:54,902 INFO L226 Difference]: Without dead ends: 31 [2018-09-10 10:09:54,902 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 96 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-10 10:09:54,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2018-09-10 10:09:54,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2018-09-10 10:09:54,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-10 10:09:54,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-10 10:09:54,909 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 26 [2018-09-10 10:09:54,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:54,910 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-10 10:09:54,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-10 10:09:54,910 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-10 10:09:54,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-10 10:09:54,912 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:54,912 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:54,912 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:54,913 INFO L82 PathProgramCache]: Analyzing trace with hash 298270800, now seen corresponding path program 6 times [2018-09-10 10:09:54,913 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:54,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:54,914 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:54,914 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:54,914 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:54,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:55,107 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:55,108 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:55,108 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:09:55,115 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:09:55,116 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:09:55,136 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:09:55,137 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:55,138 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:55,167 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:55,167 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:55,955 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:55,975 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:55,976 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 18 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 18 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:09:55,990 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:09:55,990 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:09:56,085 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:09:56,085 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:56,088 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:56,114 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:56,115 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:56,169 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:56,173 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:56,173 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-10 10:09:56,173 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:56,174 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-10 10:09:56,174 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-10 10:09:56,174 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-10 10:09:56,175 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 9 states. [2018-09-10 10:09:56,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:56,326 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-10 10:09:56,326 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-10 10:09:56,326 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-09-10 10:09:56,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:56,327 INFO L225 Difference]: With dead ends: 39 [2018-09-10 10:09:56,328 INFO L226 Difference]: Without dead ends: 34 [2018-09-10 10:09:56,329 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-10 10:09:56,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-10 10:09:56,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2018-09-10 10:09:56,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-09-10 10:09:56,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2018-09-10 10:09:56,333 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 29 [2018-09-10 10:09:56,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:56,333 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2018-09-10 10:09:56,333 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-10 10:09:56,333 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2018-09-10 10:09:56,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-09-10 10:09:56,334 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:56,334 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:56,335 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:56,335 INFO L82 PathProgramCache]: Analyzing trace with hash 569990178, now seen corresponding path program 7 times [2018-09-10 10:09:56,335 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:56,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:56,336 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:09:56,336 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:56,336 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:56,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:56,731 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:56,731 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:56,731 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:09:56,745 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:56,745 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:56,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:56,758 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:56,790 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:56,790 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:58,688 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:58,711 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:58,712 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 20 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 20 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:09:58,727 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:58,727 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:09:58,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:58,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:58,772 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:58,773 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:09:58,794 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:58,796 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:09:58,796 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-10 10:09:58,796 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:09:58,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-10 10:09:58,797 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-10 10:09:58,797 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-10 10:09:58,798 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 10 states. [2018-09-10 10:09:59,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:09:59,012 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2018-09-10 10:09:59,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-10 10:09:59,012 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-09-10 10:09:59,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:09:59,013 INFO L225 Difference]: With dead ends: 42 [2018-09-10 10:09:59,014 INFO L226 Difference]: Without dead ends: 37 [2018-09-10 10:09:59,014 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-10 10:09:59,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2018-09-10 10:09:59,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2018-09-10 10:09:59,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-10 10:09:59,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-10 10:09:59,020 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 32 [2018-09-10 10:09:59,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:09:59,020 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-10 10:09:59,020 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-10 10:09:59,020 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-10 10:09:59,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-10 10:09:59,022 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:09:59,022 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:09:59,022 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:09:59,022 INFO L82 PathProgramCache]: Analyzing trace with hash -651372784, now seen corresponding path program 8 times [2018-09-10 10:09:59,022 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:09:59,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:59,023 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:09:59,023 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:09:59,024 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:09:59,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:09:59,247 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:59,248 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:09:59,248 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:09:59,275 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:09:59,276 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:09:59,291 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:09:59,291 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:09:59,292 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:09:59,326 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:09:59,326 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:02,448 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:02,468 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:02,468 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 22 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 22 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:02,483 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:10:02,484 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:10:02,517 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:10:02,518 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:02,521 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:02,533 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:02,533 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:02,544 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:02,545 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:02,546 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-09-10 10:10:02,546 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:02,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-10 10:10:02,546 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-10 10:10:02,547 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-10 10:10:02,547 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 11 states. [2018-09-10 10:10:02,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:02,750 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-10 10:10:02,755 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-10 10:10:02,755 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2018-09-10 10:10:02,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:02,756 INFO L225 Difference]: With dead ends: 45 [2018-09-10 10:10:02,756 INFO L226 Difference]: Without dead ends: 40 [2018-09-10 10:10:02,757 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-10 10:10:02,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-10 10:10:02,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2018-09-10 10:10:02,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2018-09-10 10:10:02,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2018-09-10 10:10:02,761 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 35 [2018-09-10 10:10:02,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:02,762 INFO L480 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2018-09-10 10:10:02,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-10 10:10:02,762 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2018-09-10 10:10:02,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2018-09-10 10:10:02,763 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:02,763 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:02,763 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:02,763 INFO L82 PathProgramCache]: Analyzing trace with hash 687557986, now seen corresponding path program 9 times [2018-09-10 10:10:02,763 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:02,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:02,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:10:02,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:02,765 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:02,775 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:02,987 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:02,987 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:02,987 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:02,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:10:02,995 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:10:03,080 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-10 10:10:03,081 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:03,083 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:03,122 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:03,122 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:06,028 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:06,048 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:06,048 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 24 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 24 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:06,064 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:10:06,064 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:10:06,237 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-10 10:10:06,238 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:06,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:06,263 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:06,263 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:06,301 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:06,302 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:06,303 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-09-10 10:10:06,303 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:06,303 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-10 10:10:06,303 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-10 10:10:06,304 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-10 10:10:06,304 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 12 states. [2018-09-10 10:10:06,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:06,471 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2018-09-10 10:10:06,473 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-10 10:10:06,474 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2018-09-10 10:10:06,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:06,475 INFO L225 Difference]: With dead ends: 48 [2018-09-10 10:10:06,475 INFO L226 Difference]: Without dead ends: 43 [2018-09-10 10:10:06,476 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 140 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-10 10:10:06,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2018-09-10 10:10:06,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 42. [2018-09-10 10:10:06,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-10 10:10:06,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-10 10:10:06,484 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 38 [2018-09-10 10:10:06,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:06,484 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-10 10:10:06,485 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-10 10:10:06,485 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-10 10:10:06,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-10 10:10:06,485 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:06,486 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:06,486 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:06,486 INFO L82 PathProgramCache]: Analyzing trace with hash 1412849104, now seen corresponding path program 10 times [2018-09-10 10:10:06,486 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:06,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:06,487 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:10:06,487 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:06,487 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:06,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:06,779 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:06,780 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:06,780 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:06,787 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:10:06,787 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:10:06,827 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:10:06,828 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:06,829 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:06,898 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:06,898 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:10,456 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:10,476 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:10,476 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 26 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 26 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:10,494 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:10:10,494 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:10:10,530 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:10:10,530 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:10,534 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:10,549 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:10,549 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:10,563 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:10,564 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:10,564 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-09-10 10:10:10,564 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:10,565 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-10 10:10:10,565 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-10 10:10:10,565 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-10 10:10:10,566 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 13 states. [2018-09-10 10:10:10,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:10,782 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-09-10 10:10:10,783 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-10 10:10:10,783 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-09-10 10:10:10,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:10,784 INFO L225 Difference]: With dead ends: 51 [2018-09-10 10:10:10,784 INFO L226 Difference]: Without dead ends: 46 [2018-09-10 10:10:10,785 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 151 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-10 10:10:10,785 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-09-10 10:10:10,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-09-10 10:10:10,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-09-10 10:10:10,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2018-09-10 10:10:10,790 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 41 [2018-09-10 10:10:10,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:10,791 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2018-09-10 10:10:10,792 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-10 10:10:10,792 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2018-09-10 10:10:10,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-09-10 10:10:10,792 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:10,792 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:10,793 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:10,793 INFO L82 PathProgramCache]: Analyzing trace with hash 580079266, now seen corresponding path program 11 times [2018-09-10 10:10:10,793 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:10,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:10,794 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:10:10,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:10,794 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:10,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:10,977 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:10,977 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:10,977 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:10,985 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:10:10,985 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:10:14,111 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-10 10:10:14,111 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:14,147 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:14,202 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:14,202 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:17,776 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:17,795 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:17,796 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 28 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 28 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:17,814 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:10:17,814 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:10:17,990 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-10 10:10:17,990 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:17,994 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:18,020 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:18,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:18,032 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:18,034 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:18,034 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-09-10 10:10:18,034 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:18,034 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-10 10:10:18,034 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-10 10:10:18,035 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-10 10:10:18,035 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 14 states. [2018-09-10 10:10:18,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:18,332 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2018-09-10 10:10:18,333 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-10 10:10:18,333 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-09-10 10:10:18,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:18,334 INFO L225 Difference]: With dead ends: 54 [2018-09-10 10:10:18,334 INFO L226 Difference]: Without dead ends: 49 [2018-09-10 10:10:18,335 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 162 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-10 10:10:18,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2018-09-10 10:10:18,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 48. [2018-09-10 10:10:18,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-09-10 10:10:18,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-09-10 10:10:18,340 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 44 [2018-09-10 10:10:18,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:18,340 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-09-10 10:10:18,340 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-10 10:10:18,340 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-09-10 10:10:18,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-09-10 10:10:18,341 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:18,341 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:18,342 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:18,342 INFO L82 PathProgramCache]: Analyzing trace with hash -735062896, now seen corresponding path program 12 times [2018-09-10 10:10:18,342 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:18,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:18,343 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:10:18,343 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:18,343 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:18,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:18,700 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:18,701 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:18,701 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:18,708 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:10:18,708 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:10:49,820 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-10 10:10:49,820 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:49,983 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:49,997 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:49,997 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:52,440 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:52,462 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:52,462 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 30 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 30 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:52,477 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:10:52,477 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:10:52,739 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-10 10:10:52,740 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:52,745 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:52,766 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:52,766 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:52,774 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:52,775 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:52,776 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-10 10:10:52,776 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:52,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-10 10:10:52,776 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-10 10:10:52,777 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:10:52,777 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 15 states. [2018-09-10 10:10:53,078 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:53,079 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-09-10 10:10:53,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-10 10:10:53,080 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2018-09-10 10:10:53,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:53,081 INFO L225 Difference]: With dead ends: 57 [2018-09-10 10:10:53,082 INFO L226 Difference]: Without dead ends: 52 [2018-09-10 10:10:53,082 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 173 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:10:53,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-09-10 10:10:53,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2018-09-10 10:10:53,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2018-09-10 10:10:53,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2018-09-10 10:10:53,088 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 47 [2018-09-10 10:10:53,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:53,088 INFO L480 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2018-09-10 10:10:53,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-10 10:10:53,088 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2018-09-10 10:10:53,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2018-09-10 10:10:53,089 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:53,089 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:53,089 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:53,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1443536926, now seen corresponding path program 13 times [2018-09-10 10:10:53,090 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:53,090 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:53,090 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:10:53,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:53,091 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:53,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:54,114 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:54,115 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:54,115 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:54,122 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:10:54,122 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:10:54,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:54,139 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:54,170 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:54,171 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:57,817 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:57,838 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:57,838 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 32 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 32 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:10:57,856 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:10:57,856 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:10:57,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:57,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:57,918 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:57,918 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:10:57,935 INFO L134 CoverageAnalysis]: Checked inductivity of 260 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:57,936 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:10:57,936 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-10 10:10:57,937 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:10:57,937 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-10 10:10:57,937 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-10 10:10:57,937 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-10 10:10:57,938 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 16 states. [2018-09-10 10:10:58,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:10:58,296 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2018-09-10 10:10:58,296 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-10 10:10:58,296 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2018-09-10 10:10:58,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:10:58,297 INFO L225 Difference]: With dead ends: 60 [2018-09-10 10:10:58,297 INFO L226 Difference]: Without dead ends: 55 [2018-09-10 10:10:58,298 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 215 GetRequests, 184 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-10 10:10:58,298 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2018-09-10 10:10:58,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 54. [2018-09-10 10:10:58,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-09-10 10:10:58,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-09-10 10:10:58,309 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 50 [2018-09-10 10:10:58,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:10:58,309 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-09-10 10:10:58,309 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-10 10:10:58,309 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-09-10 10:10:58,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-09-10 10:10:58,310 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:10:58,310 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:10:58,310 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:10:58,310 INFO L82 PathProgramCache]: Analyzing trace with hash -2124072112, now seen corresponding path program 14 times [2018-09-10 10:10:58,311 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:10:58,311 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:58,312 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:10:58,312 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:10:58,312 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:10:58,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:10:59,676 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:59,676 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:10:59,676 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:10:59,684 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:10:59,684 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:10:59,702 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:10:59,702 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:10:59,703 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:10:59,714 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:10:59,714 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:05,832 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:05,852 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:05,852 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 34 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 34 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:11:05,867 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:11:05,867 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:11:05,916 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:11:05,916 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:11:05,919 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:11:05,928 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:05,928 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:05,937 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:05,939 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:11:05,939 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-09-10 10:11:05,939 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:11:05,939 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-10 10:11:05,939 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-10 10:11:05,940 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-10 10:11:05,940 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 17 states. [2018-09-10 10:11:06,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:11:06,370 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-09-10 10:11:06,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-10 10:11:06,378 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-09-10 10:11:06,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:11:06,378 INFO L225 Difference]: With dead ends: 63 [2018-09-10 10:11:06,379 INFO L226 Difference]: Without dead ends: 58 [2018-09-10 10:11:06,379 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 228 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-10 10:11:06,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-09-10 10:11:06,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2018-09-10 10:11:06,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-09-10 10:11:06,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2018-09-10 10:11:06,387 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 53 [2018-09-10 10:11:06,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:11:06,391 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2018-09-10 10:11:06,391 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-10 10:11:06,391 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2018-09-10 10:11:06,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-09-10 10:11:06,391 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:11:06,392 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:11:06,392 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:11:06,392 INFO L82 PathProgramCache]: Analyzing trace with hash 592806178, now seen corresponding path program 15 times [2018-09-10 10:11:06,392 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:11:06,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:06,393 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:11:06,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:06,393 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:11:06,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:11:06,645 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:06,645 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:06,646 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:11:06,654 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:11:06,654 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:11:13,704 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-10 10:11:13,704 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:11:13,726 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:11:13,753 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:13,753 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:20,573 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:20,595 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:20,595 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 36 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 36 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:11:20,613 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:11:20,613 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:11:21,020 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-10 10:11:21,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:11:21,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:11:21,039 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:21,040 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:21,055 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:21,058 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:11:21,058 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-09-10 10:11:21,058 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:11:21,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-10 10:11:21,059 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-10 10:11:21,059 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-10 10:11:21,060 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 18 states. [2018-09-10 10:11:21,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:11:21,755 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2018-09-10 10:11:21,756 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-10 10:11:21,756 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-09-10 10:11:21,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:11:21,757 INFO L225 Difference]: With dead ends: 66 [2018-09-10 10:11:21,757 INFO L226 Difference]: Without dead ends: 61 [2018-09-10 10:11:21,758 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 241 GetRequests, 206 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-10 10:11:21,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2018-09-10 10:11:21,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 60. [2018-09-10 10:11:21,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-09-10 10:11:21,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 60 transitions. [2018-09-10 10:11:21,763 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 60 transitions. Word has length 56 [2018-09-10 10:11:21,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:11:21,763 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 60 transitions. [2018-09-10 10:11:21,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-10 10:11:21,763 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 60 transitions. [2018-09-10 10:11:21,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-09-10 10:11:21,764 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:11:21,764 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:11:21,764 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:11:21,764 INFO L82 PathProgramCache]: Analyzing trace with hash 455250448, now seen corresponding path program 16 times [2018-09-10 10:11:21,765 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:11:21,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:21,765 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:11:21,765 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:21,765 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:11:21,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:11:22,715 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:22,716 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:22,716 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:11:22,723 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:11:22,724 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:11:22,742 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:11:22,742 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:11:22,744 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:11:22,755 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:22,755 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:30,157 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:30,180 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:30,180 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 38 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 38 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:11:30,196 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:11:30,196 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:11:30,244 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:11:30,245 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:11:30,248 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:11:30,265 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:30,266 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:11:30,275 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:30,276 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:11:30,277 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-09-10 10:11:30,277 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:11:30,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-10 10:11:30,278 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-10 10:11:30,278 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-10 10:11:30,279 INFO L87 Difference]: Start difference. First operand 60 states and 60 transitions. Second operand 19 states. [2018-09-10 10:11:30,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:11:30,760 INFO L93 Difference]: Finished difference Result 69 states and 69 transitions. [2018-09-10 10:11:30,761 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-10 10:11:30,761 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2018-09-10 10:11:30,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:11:30,762 INFO L225 Difference]: With dead ends: 69 [2018-09-10 10:11:30,762 INFO L226 Difference]: Without dead ends: 64 [2018-09-10 10:11:30,764 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 254 GetRequests, 217 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-10 10:11:30,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2018-09-10 10:11:30,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2018-09-10 10:11:30,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2018-09-10 10:11:30,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2018-09-10 10:11:30,768 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 59 [2018-09-10 10:11:30,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:11:30,768 INFO L480 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2018-09-10 10:11:30,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-09-10 10:11:30,768 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2018-09-10 10:11:30,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2018-09-10 10:11:30,769 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:11:30,769 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:11:30,769 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:11:30,770 INFO L82 PathProgramCache]: Analyzing trace with hash -68701598, now seen corresponding path program 17 times [2018-09-10 10:11:30,770 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:11:30,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:30,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:11:30,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:11:30,771 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:11:30,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:11:32,272 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:11:32,273 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:11:32,273 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:11:32,281 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:11:32,281 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:07,848 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-10 10:13:07,848 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:07,960 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:07,996 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:07,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:18,371 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,377 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:18,377 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 40 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 40 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:18,406 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:13:18,407 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:18,855 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-09-10 10:13:18,855 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:18,860 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:18,879 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,880 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:18,941 INFO L134 CoverageAnalysis]: Checked inductivity of 442 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,944 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:18,944 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-09-10 10:13:18,944 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:18,945 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-09-10 10:13:18,945 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-09-10 10:13:18,946 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-09-10 10:13:18,946 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 20 states. [2018-09-10 10:13:19,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:19,699 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2018-09-10 10:13:19,699 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-09-10 10:13:19,700 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2018-09-10 10:13:19,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:19,701 INFO L225 Difference]: With dead ends: 72 [2018-09-10 10:13:19,701 INFO L226 Difference]: Without dead ends: 67 [2018-09-10 10:13:19,702 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 267 GetRequests, 228 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=397, Invalid=1008, Unknown=1, NotChecked=0, Total=1406 [2018-09-10 10:13:19,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-09-10 10:13:19,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2018-09-10 10:13:19,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-09-10 10:13:19,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 66 transitions. [2018-09-10 10:13:19,706 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 66 transitions. Word has length 62 [2018-09-10 10:13:19,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:19,706 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 66 transitions. [2018-09-10 10:13:19,706 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-09-10 10:13:19,706 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 66 transitions. [2018-09-10 10:13:19,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-09-10 10:13:19,707 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:19,707 INFO L376 BasicCegarLoop]: trace histogram [19, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:19,707 INFO L423 AbstractCegarLoop]: === Iteration 25 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_diamond_true_unreach_call__true_termination_i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:19,707 INFO L82 PathProgramCache]: Analyzing trace with hash -1212950320, now seen corresponding path program 18 times [2018-09-10 10:13:19,708 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:19,708 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:19,708 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:19,709 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:19,709 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:19,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:21,835 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:21,836 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:21,836 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:21,852 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:13:21,852 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:13:23,670 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-10 10:13:23,671 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:23,675 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:23,727 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:23,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:27,925 WARN L175 SmtUtils]: Spent 2.23 s on a formula simplification that was a NOOP. DAG size: 12 [2018-09-10 10:13:28,869 WARN L175 SmtUtils]: Spent 664.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-10 10:13:31,766 WARN L175 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 12 [2018-09-10 10:13:32,235 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:32,256 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:32,256 INFO L197 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 42 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 42 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:32,273 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:13:32,273 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:13:32,904 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-09-10 10:13:32,905 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:32,909 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:32,926 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:32,926 INFO L316 TraceCheckSpWp]: Computing backward predicates... Received shutdown request... [2018-09-10 10:13:50,043 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-09-10 10:13:50,244 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:50,244 WARN L549 AbstractCegarLoop]: Verification canceled [2018-09-10 10:13:50,250 WARN L206 ceAbstractionStarter]: Timeout [2018-09-10 10:13:50,250 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 10:13:50 BoogieIcfgContainer [2018-09-10 10:13:50,250 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-09-10 10:13:50,251 INFO L168 Benchmark]: Toolchain (without parser) took 277550.31 ms. Allocated memory was 1.5 GB in the beginning and 2.6 GB in the end (delta: 1.1 GB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -626.6 MB). Peak memory consumption was 440.3 MB. Max. memory is 7.1 GB. [2018-09-10 10:13:50,252 INFO L168 Benchmark]: CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:13:50,252 INFO L168 Benchmark]: CACSL2BoogieTranslator took 281.98 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-09-10 10:13:50,253 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:13:50,253 INFO L168 Benchmark]: Boogie Preprocessor took 38.00 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-09-10 10:13:50,254 INFO L168 Benchmark]: RCFGBuilder took 460.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-09-10 10:13:50,254 INFO L168 Benchmark]: TraceAbstraction took 276737.95 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 314.0 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 157.8 MB). Peak memory consumption was 471.8 MB. Max. memory is 7.1 GB. [2018-09-10 10:13:50,258 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.25 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 281.98 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 25.90 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 38.00 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 460.01 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 752.9 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 276737.95 ms. Allocated memory was 2.3 GB in the beginning and 2.6 GB in the end (delta: 314.0 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 157.8 MB). Peak memory consumption was 471.8 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 5]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 5). Cancelled while BasicCegarLoop was analyzing trace of length 66 with TraceHistMax 19, while TraceCheckSpWp was constructing backward predicates, while PredicateComparison was comparing new predicate (quantifier-free) to 53 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 276.6s OverallTime, 25 OverallIterations, 19 TraceHistogramMax, 5.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 436 SDtfs, 25 SDslu, 3422 SDs, 0 SdLazy, 4681 SolverSat, 2 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 4.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2962 GetRequests, 2534 SyntacticMatches, 59 SemanticMatches, 369 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 202 ImplicationChecksByTransitivity, 81.1s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=66occurred in iteration=24, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 24 MinimizatonAttempts, 25 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 151.4s SatisfiabilityAnalysisTime, 87.7s InterpolantComputationTime, 2126 NumberOfCodeBlocks, 2123 NumberOfCodeBlocksAsserted, 235 NumberOfCheckSat, 3398 ConstructedInterpolants, 1 QuantifiedInterpolants, 804536 SizeOfPredicates, 42 NumberOfNonLiveVariables, 2851 ConjunctsInSsa, 749 ConjunctsInUnsatCore, 102 InterpolantComputations, 6 PerfectInterpolantSequences, 44/13874 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diamond_true-unreach-call1_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-09-10_10-13-50-282.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/diamond_true-unreach-call1_true-termination.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-09-10_10-13-50-282.csv Completed graceful shutdown