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/simple_true-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-3142e50-m [2018-09-10 10:13:10,402 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-09-10 10:13:10,404 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-09-10 10:13:10,416 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-09-10 10:13:10,416 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-09-10 10:13:10,417 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-09-10 10:13:10,418 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-09-10 10:13:10,420 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-09-10 10:13:10,421 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-09-10 10:13:10,422 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-09-10 10:13:10,423 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-09-10 10:13:10,423 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-09-10 10:13:10,424 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-09-10 10:13:10,425 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-09-10 10:13:10,426 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-09-10 10:13:10,427 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-09-10 10:13:10,428 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-09-10 10:13:10,430 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-09-10 10:13:10,435 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-09-10 10:13:10,437 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-09-10 10:13:10,440 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-09-10 10:13:10,441 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-09-10 10:13:10,447 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-09-10 10:13:10,447 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-09-10 10:13:10,447 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-09-10 10:13:10,450 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-09-10 10:13:10,451 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-09-10 10:13:10,454 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-09-10 10:13:10,455 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-09-10 10:13:10,456 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-09-10 10:13:10,456 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-09-10 10:13:10,460 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-09-10 10:13:10,460 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-09-10 10:13:10,460 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-09-10 10:13:10,461 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-09-10 10:13:10,462 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-09-10 10:13:10,462 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 10:13:10,489 INFO L110 SettingsManager]: Loading preferences was successful [2018-09-10 10:13:10,489 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-09-10 10:13:10,490 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-09-10 10:13:10,490 INFO L133 SettingsManager]: * User list type=DISABLED [2018-09-10 10:13:10,490 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-09-10 10:13:10,491 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-09-10 10:13:10,491 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-09-10 10:13:10,491 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-09-10 10:13:10,491 INFO L133 SettingsManager]: * Log string format=TERM [2018-09-10 10:13:10,491 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-09-10 10:13:10,492 INFO L133 SettingsManager]: * Interval Domain=false [2018-09-10 10:13:10,492 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-09-10 10:13:10,493 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-09-10 10:13:10,493 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-09-10 10:13:10,493 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-09-10 10:13:10,494 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-09-10 10:13:10,494 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-09-10 10:13:10,494 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-09-10 10:13:10,494 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-09-10 10:13:10,494 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-09-10 10:13:10,495 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-09-10 10:13:10,495 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-09-10 10:13:10,495 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-09-10 10:13:10,495 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-09-10 10:13:10,495 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-09-10 10:13:10,496 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-09-10 10:13:10,497 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-09-10 10:13:10,497 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-09-10 10:13:10,497 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-09-10 10:13:10,497 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-09-10 10:13:10,497 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-09-10 10:13:10,498 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-09-10 10:13:10,498 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-09-10 10:13:10,558 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-09-10 10:13:10,573 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-09-10 10:13:10,578 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-09-10 10:13:10,580 INFO L271 PluginConnector]: Initializing CDTParser... [2018-09-10 10:13:10,581 INFO L276 PluginConnector]: CDTParser initialized [2018-09-10 10:13:10,582 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-09-10 10:13:10,934 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a83e383eb/1f2633865e614d1fa996e52e99a41569/FLAG1f4c8a809 [2018-09-10 10:13:11,082 INFO L276 CDTParser]: Found 1 translation units. [2018-09-10 10:13:11,082 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-09-10 10:13:11,089 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a83e383eb/1f2633865e614d1fa996e52e99a41569/FLAG1f4c8a809 [2018-09-10 10:13:11,105 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a83e383eb/1f2633865e614d1fa996e52e99a41569 [2018-09-10 10:13:11,116 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-09-10 10:13:11,119 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-09-10 10:13:11,120 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-09-10 10:13:11,120 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-09-10 10:13:11,126 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-09-10 10:13:11,127 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,130 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49fc871f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11, skipping insertion in model container [2018-09-10 10:13:11,130 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,294 INFO L180 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-09-10 10:13:11,329 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:13:11,347 INFO L431 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-09-10 10:13:11,350 INFO L175 PostProcessor]: Settings: Checked method=main [2018-09-10 10:13:11,363 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11 WrapperNode [2018-09-10 10:13:11,363 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-09-10 10:13:11,364 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-09-10 10:13:11,364 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-09-10 10:13:11,365 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-09-10 10:13:11,374 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,380 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,385 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-09-10 10:13:11,386 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-09-10 10:13:11,386 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-09-10 10:13:11,386 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-09-10 10:13:11,395 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,396 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,396 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,397 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,399 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,405 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,406 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (1/1) ... [2018-09-10 10:13:11,413 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-09-10 10:13:11,413 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-09-10 10:13:11,413 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-09-10 10:13:11,414 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-09-10 10:13:11,416 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (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 10:13:11,482 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-09-10 10:13:11,482 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-09-10 10:13:11,482 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assert [2018-09-10 10:13:11,482 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assert [2018-09-10 10:13:11,483 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-09-10 10:13:11,483 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-09-10 10:13:11,483 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-09-10 10:13:11,483 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-09-10 10:13:11,713 INFO L353 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-09-10 10:13:11,713 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:13:11 BoogieIcfgContainer [2018-09-10 10:13:11,714 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-09-10 10:13:11,714 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-09-10 10:13:11,715 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-09-10 10:13:11,718 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-09-10 10:13:11,718 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 10.09 10:13:11" (1/3) ... [2018-09-10 10:13:11,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34f6c75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:13:11, skipping insertion in model container [2018-09-10 10:13:11,719 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 10.09 10:13:11" (2/3) ... [2018-09-10 10:13:11,719 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@34f6c75 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 10.09 10:13:11, skipping insertion in model container [2018-09-10 10:13:11,720 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 10.09 10:13:11" (3/3) ... [2018-09-10 10:13:11,721 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_true-unreach-call1.i [2018-09-10 10:13:11,732 INFO L137 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-09-10 10:13:11,741 INFO L149 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-09-10 10:13:11,784 INFO L130 ementStrategyFactory]: Using default assertion order modulation [2018-09-10 10:13:11,785 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-09-10 10:13:11,785 INFO L382 AbstractCegarLoop]: Hoare is true [2018-09-10 10:13:11,785 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-09-10 10:13:11,785 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-09-10 10:13:11,785 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-09-10 10:13:11,785 INFO L386 AbstractCegarLoop]: Difference is false [2018-09-10 10:13:11,785 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-09-10 10:13:11,785 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-09-10 10:13:11,801 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-09-10 10:13:11,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-09-10 10:13:11,806 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:11,807 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:11,808 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:11,813 INFO L82 PathProgramCache]: Analyzing trace with hash 314686959, now seen corresponding path program 1 times [2018-09-10 10:13:11,816 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:11,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:11,865 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:11,865 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:11,866 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:11,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:11,922 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 10:13:11,924 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:13:11,924 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-09-10 10:13:11,924 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:13:11,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-09-10 10:13:11,939 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-09-10 10:13:11,940 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-09-10 10:13:11,942 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-09-10 10:13:11,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:11,964 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-09-10 10:13:11,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-09-10 10:13:11,965 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-09-10 10:13:11,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:11,974 INFO L225 Difference]: With dead ends: 29 [2018-09-10 10:13:11,974 INFO L226 Difference]: Without dead ends: 12 [2018-09-10 10:13:11,977 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 10:13:11,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-09-10 10:13:12,011 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-09-10 10:13:12,012 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-09-10 10:13:12,013 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-09-10 10:13:12,015 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-09-10 10:13:12,015 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:12,015 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-09-10 10:13:12,015 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-09-10 10:13:12,015 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-09-10 10:13:12,016 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-09-10 10:13:12,016 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:12,016 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:12,017 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:12,017 INFO L82 PathProgramCache]: Analyzing trace with hash 926255632, now seen corresponding path program 1 times [2018-09-10 10:13:12,017 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:12,018 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,019 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:12,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,019 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:12,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:12,150 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 10:13:12,151 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-09-10 10:13:12,151 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-09-10 10:13:12,151 INFO L265 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-09-10 10:13:12,153 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-09-10 10:13:12,154 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-09-10 10:13:12,154 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:13:12,155 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-09-10 10:13:12,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:12,203 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-09-10 10:13:12,204 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-09-10 10:13:12,204 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-09-10 10:13:12,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:12,205 INFO L225 Difference]: With dead ends: 19 [2018-09-10 10:13:12,205 INFO L226 Difference]: Without dead ends: 14 [2018-09-10 10:13:12,206 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-09-10 10:13:12,206 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-09-10 10:13:12,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-09-10 10:13:12,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-09-10 10:13:12,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-09-10 10:13:12,214 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-09-10 10:13:12,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:12,215 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-09-10 10:13:12,215 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-09-10 10:13:12,215 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-09-10 10:13:12,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-09-10 10:13:12,216 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:12,216 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:12,218 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:12,219 INFO L82 PathProgramCache]: Analyzing trace with hash -1883357962, now seen corresponding path program 1 times [2018-09-10 10:13:12,219 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:12,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,220 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:12,220 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,220 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:12,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:12,366 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 10:13:12,367 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:12,367 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 10:13:12,383 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:12,383 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:13:12,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:12,424 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:12,471 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 10:13:12,472 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:12,565 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 10:13:12,589 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:12,589 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 10:13:12,605 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:12,605 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:13:12,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:12,623 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:12,664 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 10:13:12,664 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:12,679 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 10:13:12,688 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:12,688 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-09-10 10:13:12,688 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:12,689 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-09-10 10:13:12,689 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-09-10 10:13:12,689 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-09-10 10:13:12,690 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-09-10 10:13:12,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:12,750 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-09-10 10:13:12,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-09-10 10:13:12,754 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-09-10 10:13:12,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:12,755 INFO L225 Difference]: With dead ends: 21 [2018-09-10 10:13:12,755 INFO L226 Difference]: Without dead ends: 16 [2018-09-10 10:13:12,756 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 48 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 10:13:12,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-09-10 10:13:12,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-09-10 10:13:12,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-09-10 10:13:12,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-09-10 10:13:12,763 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-09-10 10:13:12,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:12,764 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-09-10 10:13:12,764 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-09-10 10:13:12,764 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-09-10 10:13:12,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-09-10 10:13:12,767 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:12,768 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:12,768 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:12,768 INFO L82 PathProgramCache]: Analyzing trace with hash -387592612, now seen corresponding path program 2 times [2018-09-10 10:13:12,768 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:12,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,770 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:12,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:12,770 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:12,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:13,015 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,015 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:13,015 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 10:13:13,031 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:13:13,031 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:13,045 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:13:13,046 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:13,049 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:13,106 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:13,330 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,350 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:13,351 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 10:13:13,366 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:13:13,366 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:13,386 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:13:13,386 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:13,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:13,406 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,407 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:13,424 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,428 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:13,429 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-09-10 10:13:13,429 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:13,429 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-09-10 10:13:13,430 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-09-10 10:13:13,430 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:13:13,430 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-09-10 10:13:13,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:13,468 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-09-10 10:13:13,468 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-09-10 10:13:13,468 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-09-10 10:13:13,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:13,469 INFO L225 Difference]: With dead ends: 23 [2018-09-10 10:13:13,469 INFO L226 Difference]: Without dead ends: 18 [2018-09-10 10:13:13,470 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-09-10 10:13:13,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-09-10 10:13:13,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-09-10 10:13:13,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-09-10 10:13:13,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-09-10 10:13:13,474 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-09-10 10:13:13,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:13,475 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-09-10 10:13:13,475 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-09-10 10:13:13,475 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-09-10 10:13:13,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-09-10 10:13:13,476 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:13,476 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:13,476 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:13,476 INFO L82 PathProgramCache]: Analyzing trace with hash -1771135422, now seen corresponding path program 3 times [2018-09-10 10:13:13,477 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:13,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:13,478 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:13,478 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:13,478 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:13,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:13,600 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,600 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:13,600 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 10:13:13,615 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:13:13,615 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:13:13,679 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-10 10:13:13,680 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:13,683 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:13,756 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,756 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:13,853 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,875 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:13,875 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 10:13:13,892 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:13:13,893 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:13:13,930 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-09-10 10:13:13,930 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:13,934 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:13,944 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:13,953 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:13,955 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:13,955 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-09-10 10:13:13,955 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:13,956 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-09-10 10:13:13,956 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-09-10 10:13:13,957 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-10 10:13:13,957 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-09-10 10:13:14,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:14,014 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-09-10 10:13:14,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-09-10 10:13:14,015 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-09-10 10:13:14,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:14,015 INFO L225 Difference]: With dead ends: 25 [2018-09-10 10:13:14,015 INFO L226 Difference]: Without dead ends: 20 [2018-09-10 10:13:14,016 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-09-10 10:13:14,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-09-10 10:13:14,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-09-10 10:13:14,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-09-10 10:13:14,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-09-10 10:13:14,021 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-09-10 10:13:14,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:14,021 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-09-10 10:13:14,021 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-09-10 10:13:14,021 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-09-10 10:13:14,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-09-10 10:13:14,022 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:14,022 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:14,023 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:14,023 INFO L82 PathProgramCache]: Analyzing trace with hash 84085928, now seen corresponding path program 4 times [2018-09-10 10:13:14,023 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:14,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:14,024 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:14,024 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:14,024 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:14,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:14,258 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:14,258 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:14,259 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 10:13:14,273 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:13:14,273 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:13:14,307 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:13:14,308 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:14,310 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:14,376 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:14,376 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:14,662 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:14,682 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:14,682 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 10:13:14,698 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:13:14,698 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:13:14,718 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:13:14,718 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:14,722 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:14,746 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:14,747 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:14,756 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:14,758 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:14,758 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-09-10 10:13:14,758 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:14,759 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-09-10 10:13:14,760 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-09-10 10:13:14,760 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-10 10:13:14,761 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-09-10 10:13:14,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:14,841 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-09-10 10:13:14,842 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-09-10 10:13:14,842 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-09-10 10:13:14,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:14,843 INFO L225 Difference]: With dead ends: 27 [2018-09-10 10:13:14,843 INFO L226 Difference]: Without dead ends: 22 [2018-09-10 10:13:14,844 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-09-10 10:13:14,844 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-09-10 10:13:14,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-09-10 10:13:14,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-09-10 10:13:14,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-09-10 10:13:14,849 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-09-10 10:13:14,849 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:14,849 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-09-10 10:13:14,850 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-09-10 10:13:14,850 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-09-10 10:13:14,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-09-10 10:13:14,850 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:14,850 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:14,851 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:14,851 INFO L82 PathProgramCache]: Analyzing trace with hash 540375438, now seen corresponding path program 5 times [2018-09-10 10:13:14,851 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:14,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:14,852 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:14,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:14,853 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:14,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:15,192 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:15,192 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:15,193 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 10:13:15,200 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:13:15,200 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:15,237 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-10 10:13:15,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:15,240 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:15,270 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:15,271 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:15,470 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:15,490 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:15,490 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 10:13:15,506 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:13:15,506 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:15,544 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-09-10 10:13:15,544 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:15,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:15,561 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:15,561 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:15,617 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:15,622 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:15,622 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-09-10 10:13:15,622 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:15,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-09-10 10:13:15,623 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-09-10 10:13:15,624 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-10 10:13:15,625 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-09-10 10:13:15,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:15,771 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-09-10 10:13:15,773 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-09-10 10:13:15,774 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-09-10 10:13:15,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:15,774 INFO L225 Difference]: With dead ends: 29 [2018-09-10 10:13:15,774 INFO L226 Difference]: Without dead ends: 24 [2018-09-10 10:13:15,775 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-09-10 10:13:15,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-09-10 10:13:15,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-09-10 10:13:15,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-09-10 10:13:15,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-09-10 10:13:15,780 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-09-10 10:13:15,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:15,780 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-09-10 10:13:15,780 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-09-10 10:13:15,780 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-09-10 10:13:15,781 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-09-10 10:13:15,781 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:15,781 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:15,782 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:15,782 INFO L82 PathProgramCache]: Analyzing trace with hash 947930356, now seen corresponding path program 6 times [2018-09-10 10:13:15,782 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:15,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:15,783 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:15,783 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:15,784 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:15,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:16,045 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,045 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:16,046 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 10:13:16,056 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:13:16,058 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:13:16,078 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:13:16,078 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:16,079 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:16,094 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:16,264 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,285 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:16,285 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 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:16,301 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:13:16,301 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:13:16,371 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-09-10 10:13:16,371 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:16,375 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:16,394 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,394 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:16,409 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,410 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:16,410 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-09-10 10:13:16,411 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:16,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-09-10 10:13:16,412 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-09-10 10:13:16,412 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-10 10:13:16,413 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-09-10 10:13:16,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:16,486 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-09-10 10:13:16,488 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-09-10 10:13:16,488 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-09-10 10:13:16,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:16,490 INFO L225 Difference]: With dead ends: 31 [2018-09-10 10:13:16,491 INFO L226 Difference]: Without dead ends: 26 [2018-09-10 10:13:16,491 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-09-10 10:13:16,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-09-10 10:13:16,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-09-10 10:13:16,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-09-10 10:13:16,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-09-10 10:13:16,496 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-09-10 10:13:16,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:16,496 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-09-10 10:13:16,496 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-09-10 10:13:16,497 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-09-10 10:13:16,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-09-10 10:13:16,497 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:16,497 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:16,498 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:16,498 INFO L82 PathProgramCache]: Analyzing trace with hash 1766182618, now seen corresponding path program 7 times [2018-09-10 10:13:16,498 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:16,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:16,499 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:16,499 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:16,499 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:16,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:16,667 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,667 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:16,667 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 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:16,676 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:16,676 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:13:16,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:16,687 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:16,701 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:16,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:17,114 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:17,134 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:17,135 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 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:17,150 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:17,150 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:13:17,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:17,171 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:17,195 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:17,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:17,207 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:17,209 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:17,209 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-09-10 10:13:17,209 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:17,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-09-10 10:13:17,210 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-09-10 10:13:17,210 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-10 10:13:17,210 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-09-10 10:13:17,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:17,306 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-09-10 10:13:17,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-09-10 10:13:17,315 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-09-10 10:13:17,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:17,315 INFO L225 Difference]: With dead ends: 33 [2018-09-10 10:13:17,316 INFO L226 Difference]: Without dead ends: 28 [2018-09-10 10:13:17,316 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-09-10 10:13:17,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-09-10 10:13:17,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-09-10 10:13:17,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-09-10 10:13:17,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-09-10 10:13:17,321 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-09-10 10:13:17,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:17,321 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-09-10 10:13:17,322 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-09-10 10:13:17,322 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-09-10 10:13:17,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-09-10 10:13:17,322 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:17,323 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:17,323 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:17,323 INFO L82 PathProgramCache]: Analyzing trace with hash 2127591232, now seen corresponding path program 8 times [2018-09-10 10:13:17,323 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:17,324 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:17,325 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:13:17,325 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:17,325 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:17,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:17,629 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:17,630 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:17,630 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 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:17,639 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:13:17,640 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:17,648 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:13:17,649 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:17,651 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:17,676 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:17,676 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:18,041 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,062 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:18,062 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 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:18,079 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:13:18,079 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:13:18,104 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:13:18,104 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:18,108 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:18,144 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,144 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:18,195 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [MP cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (17)] Exception during sending of exit command (exit): Broken pipe [2018-09-10 10:13:18,199 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:18,199 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-09-10 10:13:18,199 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:18,200 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-09-10 10:13:18,200 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-09-10 10:13:18,201 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-10 10:13:18,201 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-09-10 10:13:18,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:18,552 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-09-10 10:13:18,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-09-10 10:13:18,553 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-09-10 10:13:18,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:18,554 INFO L225 Difference]: With dead ends: 35 [2018-09-10 10:13:18,554 INFO L226 Difference]: Without dead ends: 30 [2018-09-10 10:13:18,555 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-09-10 10:13:18,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-09-10 10:13:18,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-09-10 10:13:18,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-09-10 10:13:18,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-09-10 10:13:18,560 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-09-10 10:13:18,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:18,560 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-09-10 10:13:18,560 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-09-10 10:13:18,561 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-09-10 10:13:18,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-09-10 10:13:18,561 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:18,562 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:18,562 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:18,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1548918310, now seen corresponding path program 9 times [2018-09-10 10:13:18,562 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:18,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:18,563 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:18,563 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:18,563 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:18,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:18,818 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,819 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:18,819 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:18,828 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:13:18,828 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:13:18,926 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-10 10:13:18,927 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:18,929 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:18,968 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:18,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:19,395 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:19,415 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:19,415 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 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:19,431 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:13:19,431 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:13:19,533 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-09-10 10:13:19,533 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:19,536 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:19,552 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:19,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:19,569 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:19,572 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:19,573 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-09-10 10:13:19,573 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:19,573 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-09-10 10:13:19,573 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-09-10 10:13:19,574 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-10 10:13:19,574 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-09-10 10:13:19,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:19,753 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-09-10 10:13:19,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-09-10 10:13:19,754 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-09-10 10:13:19,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:19,755 INFO L225 Difference]: With dead ends: 37 [2018-09-10 10:13:19,755 INFO L226 Difference]: Without dead ends: 32 [2018-09-10 10:13:19,756 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-09-10 10:13:19,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-09-10 10:13:19,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-09-10 10:13:19,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-09-10 10:13:19,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-09-10 10:13:19,761 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-09-10 10:13:19,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:19,761 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-09-10 10:13:19,762 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-09-10 10:13:19,762 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-09-10 10:13:19,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-09-10 10:13:19,763 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:19,763 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:19,763 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:19,763 INFO L82 PathProgramCache]: Analyzing trace with hash -504978548, now seen corresponding path program 10 times [2018-09-10 10:13:19,763 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:19,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:19,764 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:19,764 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:19,764 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:19,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:19,973 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:19,973 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:19,973 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:19,984 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:13:19,984 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:13:19,995 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:13:19,996 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:19,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:20,023 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:20,023 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:20,554 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:20,575 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:20,576 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 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:13:20,591 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:13:20,591 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:13:20,616 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:13:20,616 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:13:20,619 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:13:20,628 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:20,628 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:13:20,682 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:20,684 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:13:20,684 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-09-10 10:13:20,684 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:13:20,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-09-10 10:13:20,685 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-09-10 10:13:20,686 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-10 10:13:20,686 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-09-10 10:13:20,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:13:20,850 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-09-10 10:13:20,850 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-09-10 10:13:20,850 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-09-10 10:13:20,851 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:13:20,851 INFO L225 Difference]: With dead ends: 39 [2018-09-10 10:13:20,852 INFO L226 Difference]: Without dead ends: 34 [2018-09-10 10:13:20,853 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-09-10 10:13:20,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-09-10 10:13:20,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-09-10 10:13:20,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-09-10 10:13:20,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-09-10 10:13:20,858 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-09-10 10:13:20,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:13:20,858 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-09-10 10:13:20,858 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-09-10 10:13:20,859 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-09-10 10:13:20,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-09-10 10:13:20,859 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:13:20,860 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:13:20,860 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:13:20,860 INFO L82 PathProgramCache]: Analyzing trace with hash 1385097074, now seen corresponding path program 11 times [2018-09-10 10:13:20,860 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:13:20,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:20,861 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:13:20,861 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:13:20,861 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:13:20,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:13:21,133 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:13:21,134 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:13:21,134 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 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:13:21,142 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:13:21,142 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:44,052 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-10 10:14:44,053 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:45,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:45,148 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:45,148 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:45,727 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:45,731 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:45,731 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 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:14:45,747 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-09-10 10:14:45,747 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:14:45,893 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-09-10 10:14:45,893 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:14:45,898 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:14:45,968 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:45,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:14:46,027 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:46,030 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:14:46,031 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-09-10 10:14:46,031 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:14:46,031 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-09-10 10:14:46,032 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-09-10 10:14:46,032 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-10 10:14:46,032 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-09-10 10:14:46,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:14:46,249 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-09-10 10:14:46,251 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-09-10 10:14:46,251 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-09-10 10:14:46,251 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:14:46,252 INFO L225 Difference]: With dead ends: 41 [2018-09-10 10:14:46,252 INFO L226 Difference]: Without dead ends: 36 [2018-09-10 10:14:46,253 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-09-10 10:14:46,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-09-10 10:14:46,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-09-10 10:14:46,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-09-10 10:14:46,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-09-10 10:14:46,257 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-09-10 10:14:46,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:14:46,258 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-09-10 10:14:46,258 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-09-10 10:14:46,258 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-09-10 10:14:46,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-09-10 10:14:46,259 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:14:46,259 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:14:46,259 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:14:46,260 INFO L82 PathProgramCache]: Analyzing trace with hash 976603608, now seen corresponding path program 12 times [2018-09-10 10:14:46,260 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:14:46,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:46,261 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:14:46,261 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:14:46,261 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:14:46,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:14:46,646 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:14:46,646 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:14:46,646 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 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:14:46,653 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:14:46,654 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:16:27,863 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-10 10:16:27,864 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:28,505 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:28,538 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:28,539 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:29,055 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:29,076 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:29,077 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 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:29,092 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-09-10 10:16:29,092 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-09-10 10:16:29,278 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-09-10 10:16:29,278 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:29,281 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:29,310 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:29,310 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:29,358 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:29,360 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:29,361 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-09-10 10:16:29,361 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:29,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-09-10 10:16:29,362 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-09-10 10:16:29,362 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:16:29,362 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-09-10 10:16:29,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:29,521 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-09-10 10:16:29,523 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-09-10 10:16:29,524 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-09-10 10:16:29,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:29,524 INFO L225 Difference]: With dead ends: 43 [2018-09-10 10:16:29,524 INFO L226 Difference]: Without dead ends: 38 [2018-09-10 10:16:29,525 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-09-10 10:16:29,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-09-10 10:16:29,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-09-10 10:16:29,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-09-10 10:16:29,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-09-10 10:16:29,530 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-09-10 10:16:29,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:29,530 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-09-10 10:16:29,530 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-09-10 10:16:29,530 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-09-10 10:16:29,531 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-09-10 10:16:29,531 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:29,532 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:29,532 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:29,532 INFO L82 PathProgramCache]: Analyzing trace with hash -743593282, now seen corresponding path program 13 times [2018-09-10 10:16:29,532 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:29,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:29,533 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:16:29,533 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:29,533 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:29,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:29,933 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:29,934 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:29,934 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 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:29,942 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:29,942 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:16:29,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:29,953 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:29,968 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:29,968 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:30,548 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:30,568 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:30,568 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 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:30,585 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:30,585 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-09-10 10:16:30,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:30,614 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:30,624 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:30,625 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:30,681 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:30,684 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:30,684 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-09-10 10:16:30,684 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:30,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-09-10 10:16:30,685 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-09-10 10:16:30,686 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-10 10:16:30,686 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-09-10 10:16:31,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:31,009 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-09-10 10:16:31,009 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-09-10 10:16:31,010 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-09-10 10:16:31,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:31,011 INFO L225 Difference]: With dead ends: 45 [2018-09-10 10:16:31,011 INFO L226 Difference]: Without dead ends: 40 [2018-09-10 10:16:31,012 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-09-10 10:16:31,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-09-10 10:16:31,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-09-10 10:16:31,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-09-10 10:16:31,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-09-10 10:16:31,017 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-09-10 10:16:31,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:31,017 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-09-10 10:16:31,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-09-10 10:16:31,017 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-09-10 10:16:31,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-09-10 10:16:31,018 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:31,018 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:31,018 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:31,018 INFO L82 PathProgramCache]: Analyzing trace with hash -290395612, now seen corresponding path program 14 times [2018-09-10 10:16:31,019 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:31,019 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:31,019 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-09-10 10:16:31,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:31,020 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:31,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:31,985 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:31,985 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:31,986 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 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:31,994 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:16:31,995 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:16:32,007 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:16:32,007 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:32,008 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:32,020 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:32,020 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:32,931 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:32,953 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:32,953 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 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:16:32,970 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-09-10 10:16:32,970 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-09-10 10:16:33,003 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-09-10 10:16:33,003 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:16:33,007 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:16:33,028 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:33,029 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:16:33,043 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:33,045 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:16:33,045 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-09-10 10:16:33,045 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:16:33,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-09-10 10:16:33,046 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-09-10 10:16:33,047 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-10 10:16:33,047 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-09-10 10:16:33,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:16:33,231 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-09-10 10:16:33,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-09-10 10:16:33,231 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-09-10 10:16:33,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:16:33,232 INFO L225 Difference]: With dead ends: 47 [2018-09-10 10:16:33,232 INFO L226 Difference]: Without dead ends: 42 [2018-09-10 10:16:33,233 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-09-10 10:16:33,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-09-10 10:16:33,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-09-10 10:16:33,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-09-10 10:16:33,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-09-10 10:16:33,239 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-09-10 10:16:33,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:16:33,239 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-09-10 10:16:33,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-09-10 10:16:33,239 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-09-10 10:16:33,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-09-10 10:16:33,240 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:16:33,240 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:16:33,240 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:16:33,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1440868362, now seen corresponding path program 15 times [2018-09-10 10:16:33,241 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:16:33,241 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:33,241 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:16:33,242 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:16:33,242 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:16:33,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:16:33,570 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:16:33,570 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:16:33,570 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 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:16:33,578 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:16:33,578 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:17:53,787 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-10 10:17:53,787 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:53,918 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:53,936 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:53,936 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:54,913 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:54,934 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:54,934 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 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:17:54,956 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-09-10 10:17:54,957 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-09-10 10:17:55,186 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-09-10 10:17:55,186 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:55,189 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:55,212 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:55,213 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:55,219 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:55,220 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:17:55,220 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-09-10 10:17:55,221 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:17:55,221 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-09-10 10:17:55,221 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-09-10 10:17:55,222 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-10 10:17:55,222 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-09-10 10:17:55,458 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-09-10 10:17:55,458 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-09-10 10:17:55,459 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-09-10 10:17:55,459 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-09-10 10:17:55,459 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-09-10 10:17:55,460 INFO L225 Difference]: With dead ends: 49 [2018-09-10 10:17:55,460 INFO L226 Difference]: Without dead ends: 44 [2018-09-10 10:17:55,461 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-09-10 10:17:55,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-09-10 10:17:55,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-09-10 10:17:55,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-09-10 10:17:55,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-09-10 10:17:55,466 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-09-10 10:17:55,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-09-10 10:17:55,466 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-09-10 10:17:55,466 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-09-10 10:17:55,466 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-09-10 10:17:55,470 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-09-10 10:17:55,470 INFO L368 BasicCegarLoop]: Found error trace [2018-09-10 10:17:55,470 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-09-10 10:17:55,470 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-09-10 10:17:55,470 INFO L82 PathProgramCache]: Analyzing trace with hash -1261763472, now seen corresponding path program 16 times [2018-09-10 10:17:55,471 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-09-10 10:17:55,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:55,471 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-09-10 10:17:55,471 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-09-10 10:17:55,472 INFO L295 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-09-10 10:17:55,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-09-10 10:17:55,780 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:55,780 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:55,780 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-09-10 10:17:55,788 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:17:55,788 INFO L295 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:17:55,803 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:17:55,803 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:55,805 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:55,813 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:55,813 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:56,705 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:56,724 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-09-10 10:17:56,725 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 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-09-10 10:17:56,740 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-09-10 10:17:56,740 INFO L295 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-09-10 10:17:56,772 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-09-10 10:17:56,772 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-09-10 10:17:56,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-09-10 10:17:56,797 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:56,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-09-10 10:17:56,843 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-09-10 10:17:56,846 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-09-10 10:17:56,846 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-09-10 10:17:56,846 INFO L258 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-09-10 10:17:56,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-09-10 10:17:56,847 INFO L147 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-09-10 10:17:56,847 INFO L148 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-09-10 10:17:56,848 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. Received shutdown request... [2018-09-10 10:17:57,111 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-09-10 10:17:57,111 WARN L549 AbstractCegarLoop]: Verification canceled [2018-09-10 10:17:57,116 WARN L206 ceAbstractionStarter]: Timeout [2018-09-10 10:17:57,116 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 10.09 10:17:57 BoogieIcfgContainer [2018-09-10 10:17:57,116 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-09-10 10:17:57,117 INFO L168 Benchmark]: Toolchain (without parser) took 286001.16 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 878.2 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -674.3 MB). Peak memory consumption was 203.9 MB. Max. memory is 7.1 GB. [2018-09-10 10:17:57,119 INFO L168 Benchmark]: CDTParser took 0.40 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 10:17:57,120 INFO L168 Benchmark]: CACSL2BoogieTranslator took 244.18 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 10:17:57,120 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.41 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 10:17:57,121 INFO L168 Benchmark]: Boogie Preprocessor took 27.02 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 10:17:57,121 INFO L168 Benchmark]: RCFGBuilder took 300.46 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -800.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. [2018-09-10 10:17:57,122 INFO L168 Benchmark]: TraceAbstraction took 285402.05 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 119.5 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 115.8 MB). Peak memory consumption was 235.4 MB. Max. memory is 7.1 GB. [2018-09-10 10:17:57,126 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.40 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 244.18 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 21.41 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 27.02 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 300.46 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 758.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -800.7 MB). Peak memory consumption was 26.6 MB. Max. memory is 7.1 GB. * TraceAbstraction took 285402.05 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 119.5 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 115.8 MB). Peak memory consumption was 235.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (44states) and FLOYD_HOARE automaton (currently 19 states, 19 states before enhancement), while ReachableStatesComputation was computing reachable states (39 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. TIMEOUT Result, 285.3s OverallTime, 18 OverallIterations, 17 TraceHistogramMax, 2.7s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 336 SDtfs, 0 SDslu, 2789 SDs, 0 SdLazy, 2074 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1966 GetRequests, 1612 SyntacticMatches, 49 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 11.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=44occurred in iteration=17, 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: 0.0s AutomataMinimizationTime, 17 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 265.8s SatisfiabilityAnalysisTime, 15.4s InterpolantComputationTime, 1365 NumberOfCodeBlocks, 1365 NumberOfCodeBlocksAsserted, 184 NumberOfCheckSat, 2179 ConstructedInterpolants, 0 QuantifiedInterpolants, 349005 SizeOfPredicates, 32 NumberOfNonLiveVariables, 1824 ConjunctsInSsa, 640 ConjunctsInUnsatCore, 82 InterpolantComputations, 2 PerfectInterpolantSequences, 0/8160 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/simple_true-unreach-call1.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-Benchmark-0-2018-09-10_10-17-57-139.csv Written .csv to /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/csv/simple_true-unreach-call1.i_svcomp-Reach-64bit-RubberTaipan_Default-OldIcfg.epf_AutomizerCInline.xml/Csv-TraceAbstractionBenchmarks-0-2018-09-10_10-17-57-139.csv Completed graceful shutdown