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-ddc4263 [2018-08-07 10:49:39,338 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-08-07 10:49:39,340 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-08-07 10:49:39,352 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-08-07 10:49:39,353 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-08-07 10:49:39,355 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-08-07 10:49:39,356 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-08-07 10:49:39,358 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-08-07 10:49:39,360 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-08-07 10:49:39,360 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-08-07 10:49:39,361 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-08-07 10:49:39,361 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-08-07 10:49:39,362 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-08-07 10:49:39,363 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-08-07 10:49:39,364 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-08-07 10:49:39,365 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-08-07 10:49:39,366 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-08-07 10:49:39,368 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-08-07 10:49:39,370 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-08-07 10:49:39,371 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-08-07 10:49:39,372 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-08-07 10:49:39,374 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-08-07 10:49:39,376 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-08-07 10:49:39,376 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-08-07 10:49:39,377 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-08-07 10:49:39,377 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-08-07 10:49:39,378 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-08-07 10:49:39,379 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-08-07 10:49:39,380 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-08-07 10:49:39,381 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-08-07 10:49:39,381 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-08-07 10:49:39,382 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-08-07 10:49:39,382 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-08-07 10:49:39,383 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-08-07 10:49:39,384 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-08-07 10:49:39,384 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-08-07 10:49:39,385 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 [2018-08-07 10:49:39,408 INFO L110 SettingsManager]: Loading preferences was successful [2018-08-07 10:49:39,408 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-08-07 10:49:39,410 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-08-07 10:49:39,410 INFO L133 SettingsManager]: * User list type=DISABLED [2018-08-07 10:49:39,411 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-08-07 10:49:39,411 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-08-07 10:49:39,411 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-08-07 10:49:39,411 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-08-07 10:49:39,412 INFO L133 SettingsManager]: * Log string format=TERM [2018-08-07 10:49:39,412 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-08-07 10:49:39,412 INFO L133 SettingsManager]: * Interval Domain=false [2018-08-07 10:49:39,413 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-08-07 10:49:39,413 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-08-07 10:49:39,413 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-08-07 10:49:39,414 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-08-07 10:49:39,414 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-08-07 10:49:39,414 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-08-07 10:49:39,414 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-08-07 10:49:39,414 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-08-07 10:49:39,415 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-08-07 10:49:39,416 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-08-07 10:49:39,416 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-08-07 10:49:39,416 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-08-07 10:49:39,416 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-08-07 10:49:39,416 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-08-07 10:49:39,417 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-08-07 10:49:39,417 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-08-07 10:49:39,417 INFO L133 SettingsManager]: * Trace refinement strategy=RUBBER_TAIPAN [2018-08-07 10:49:39,417 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-08-07 10:49:39,418 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-08-07 10:49:39,418 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-08-07 10:49:39,418 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-08-07 10:49:39,418 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-08-07 10:49:39,477 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-08-07 10:49:39,493 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-08-07 10:49:39,498 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-08-07 10:49:39,500 INFO L271 PluginConnector]: Initializing CDTParser... [2018-08-07 10:49:39,500 INFO L276 PluginConnector]: CDTParser initialized [2018-08-07 10:49:39,501 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-08-07 10:49:39,848 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/495915ad9/f99516f1debd49fbba9ea0b66e16c67b/FLAG02a125b60 [2018-08-07 10:49:39,967 INFO L276 CDTParser]: Found 1 translation units. [2018-08-07 10:49:39,967 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_true-unreach-call1.i [2018-08-07 10:49:39,973 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/495915ad9/f99516f1debd49fbba9ea0b66e16c67b/FLAG02a125b60 [2018-08-07 10:49:39,988 INFO L332 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/495915ad9/f99516f1debd49fbba9ea0b66e16c67b [2018-08-07 10:49:39,998 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-08-07 10:49:40,001 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-08-07 10:49:40,002 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-08-07 10:49:40,002 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-08-07 10:49:40,009 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-08-07 10:49:40,010 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.08 10:49:39" (1/1) ... [2018-08-07 10:49:40,014 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2b01e3ee and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40, skipping insertion in model container [2018-08-07 10:49:40,014 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.08 10:49:39" (1/1) ... [2018-08-07 10:49:40,167 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-08-07 10:49:40,200 INFO L175 PostProcessor]: Settings: Checked method=main [2018-08-07 10:49:40,218 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-08-07 10:49:40,222 INFO L175 PostProcessor]: Settings: Checked method=main [2018-08-07 10:49:40,235 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40 WrapperNode [2018-08-07 10:49:40,235 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-08-07 10:49:40,236 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-08-07 10:49:40,236 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-08-07 10:49:40,236 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-08-07 10:49:40,246 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,252 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,258 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-08-07 10:49:40,259 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-08-07 10:49:40,259 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-08-07 10:49:40,259 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-08-07 10:49:40,269 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,270 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,270 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,271 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,272 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,278 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,279 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (1/1) ... [2018-08-07 10:49:40,280 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-08-07 10:49:40,281 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-08-07 10:49:40,281 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-08-07 10:49:40,281 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-08-07 10:49:40,282 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (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 [2018-08-07 10:49:40,360 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-08-07 10:49:40,360 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-08-07 10:49:40,360 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 [2018-08-07 10:49:40,360 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 [2018-08-07 10:49:40,361 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-08-07 10:49:40,361 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-08-07 10:49:40,361 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-08-07 10:49:40,361 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-08-07 10:49:40,625 INFO L273 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-08-07 10:49:40,625 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.08 10:49:40 BoogieIcfgContainer [2018-08-07 10:49:40,626 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-08-07 10:49:40,626 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-08-07 10:49:40,627 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-08-07 10:49:40,630 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-08-07 10:49:40,630 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.08 10:49:39" (1/3) ... [2018-08-07 10:49:40,631 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c5d1ab0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.08 10:49:40, skipping insertion in model container [2018-08-07 10:49:40,631 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.08 10:49:40" (2/3) ... [2018-08-07 10:49:40,632 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@c5d1ab0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.08 10:49:40, skipping insertion in model container [2018-08-07 10:49:40,632 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.08 10:49:40" (3/3) ... [2018-08-07 10:49:40,634 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_true-unreach-call1.i [2018-08-07 10:49:40,644 INFO L133 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-08-07 10:49:40,652 INFO L145 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-08-07 10:49:40,703 INFO L129 ementStrategyFactory]: Using default assertion order modulation [2018-08-07 10:49:40,704 INFO L381 AbstractCegarLoop]: Interprodecural is true [2018-08-07 10:49:40,704 INFO L382 AbstractCegarLoop]: Hoare is true [2018-08-07 10:49:40,704 INFO L383 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-08-07 10:49:40,704 INFO L384 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-08-07 10:49:40,705 INFO L385 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-08-07 10:49:40,705 INFO L386 AbstractCegarLoop]: Difference is false [2018-08-07 10:49:40,705 INFO L387 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-08-07 10:49:40,705 INFO L392 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-08-07 10:49:40,724 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-08-07 10:49:40,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-08-07 10:49:40,730 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:40,731 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:40,732 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]=== [2018-08-07 10:49:40,737 INFO L82 PathProgramCache]: Analyzing trace with hash 314686959, now seen corresponding path program 1 times [2018-08-07 10:49:40,740 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:40,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:40,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:40,788 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:40,788 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:40,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:40,839 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:40,841 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-08-07 10:49:40,841 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-08-07 10:49:40,841 INFO L262 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-08-07 10:49:40,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-08-07 10:49:40,858 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-08-07 10:49:40,859 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-08-07 10:49:40,861 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-08-07 10:49:40,885 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:40,885 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-08-07 10:49:40,885 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-08-07 10:49:40,887 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-08-07 10:49:40,887 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:40,895 INFO L225 Difference]: With dead ends: 29 [2018-08-07 10:49:40,896 INFO L226 Difference]: Without dead ends: 12 [2018-08-07 10:49:40,899 INFO L603 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 [2018-08-07 10:49:40,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-08-07 10:49:40,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-08-07 10:49:40,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-08-07 10:49:40,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-08-07 10:49:40,939 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-08-07 10:49:40,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:40,940 INFO L480 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-08-07 10:49:40,940 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-08-07 10:49:40,940 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-08-07 10:49:40,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-08-07 10:49:40,941 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:40,941 INFO L376 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:40,942 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]=== [2018-08-07 10:49:40,942 INFO L82 PathProgramCache]: Analyzing trace with hash 926255632, now seen corresponding path program 1 times [2018-08-07 10:49:40,942 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:40,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:40,943 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:40,943 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:40,944 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:40,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:41,086 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,086 INFO L313 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-08-07 10:49:41,087 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-08-07 10:49:41,087 INFO L262 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-08-07 10:49:41,089 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-08-07 10:49:41,089 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-08-07 10:49:41,090 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-08-07 10:49:41,090 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-08-07 10:49:41,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:41,139 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-08-07 10:49:41,140 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-08-07 10:49:41,140 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-08-07 10:49:41,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:41,141 INFO L225 Difference]: With dead ends: 19 [2018-08-07 10:49:41,141 INFO L226 Difference]: Without dead ends: 14 [2018-08-07 10:49:41,142 INFO L603 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 [2018-08-07 10:49:41,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-08-07 10:49:41,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-08-07 10:49:41,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-08-07 10:49:41,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-08-07 10:49:41,148 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-08-07 10:49:41,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:41,148 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-08-07 10:49:41,148 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-08-07 10:49:41,148 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-08-07 10:49:41,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-08-07 10:49:41,149 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:41,152 INFO L376 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:41,153 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]=== [2018-08-07 10:49:41,153 INFO L82 PathProgramCache]: Analyzing trace with hash -1883357962, now seen corresponding path program 1 times [2018-08-07 10:49:41,153 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:41,154 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:41,155 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:41,155 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:41,155 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:41,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:41,303 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,304 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:41,304 INFO L194 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 [2018-08-07 10:49:41,332 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:41,332 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:49:41,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:41,363 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:41,419 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,419 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:41,529 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,550 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:41,550 INFO L194 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 [2018-08-07 10:49:41,566 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:41,566 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:49:41,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:41,583 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:41,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,620 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:41,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,638 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:41,638 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-08-07 10:49:41,638 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:41,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-08-07 10:49:41,639 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-08-07 10:49:41,639 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-08-07 10:49:41,640 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-08-07 10:49:41,693 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:41,693 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-08-07 10:49:41,694 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-08-07 10:49:41,694 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-08-07 10:49:41,695 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:41,696 INFO L225 Difference]: With dead ends: 21 [2018-08-07 10:49:41,696 INFO L226 Difference]: Without dead ends: 16 [2018-08-07 10:49:41,697 INFO L603 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 [2018-08-07 10:49:41,697 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-08-07 10:49:41,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-08-07 10:49:41,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-08-07 10:49:41,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-08-07 10:49:41,701 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-08-07 10:49:41,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:41,701 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-08-07 10:49:41,702 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-08-07 10:49:41,702 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-08-07 10:49:41,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-08-07 10:49:41,702 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:41,703 INFO L376 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:41,703 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]=== [2018-08-07 10:49:41,703 INFO L82 PathProgramCache]: Analyzing trace with hash -387592612, now seen corresponding path program 2 times [2018-08-07 10:49:41,704 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:41,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:41,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:41,705 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:41,705 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:41,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:41,978 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:41,979 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:41,979 INFO L194 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 [2018-08-07 10:49:41,996 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:49:41,996 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:42,019 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:49:42,020 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:42,022 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:42,095 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,095 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:42,311 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,331 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:42,331 INFO L194 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 [2018-08-07 10:49:42,347 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:49:42,348 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:42,366 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:49:42,366 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:42,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:42,391 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,391 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:42,410 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,412 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:42,412 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-08-07 10:49:42,412 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:42,413 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-08-07 10:49:42,413 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-08-07 10:49:42,414 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-08-07 10:49:42,414 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-08-07 10:49:42,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:42,437 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-08-07 10:49:42,437 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-08-07 10:49:42,438 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-08-07 10:49:42,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:42,438 INFO L225 Difference]: With dead ends: 23 [2018-08-07 10:49:42,438 INFO L226 Difference]: Without dead ends: 18 [2018-08-07 10:49:42,439 INFO L603 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 [2018-08-07 10:49:42,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-08-07 10:49:42,442 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-08-07 10:49:42,443 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-08-07 10:49:42,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-08-07 10:49:42,444 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-08-07 10:49:42,444 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:42,444 INFO L480 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-08-07 10:49:42,444 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-08-07 10:49:42,445 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-08-07 10:49:42,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-08-07 10:49:42,445 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:42,445 INFO L376 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:42,446 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]=== [2018-08-07 10:49:42,446 INFO L82 PathProgramCache]: Analyzing trace with hash -1771135422, now seen corresponding path program 3 times [2018-08-07 10:49:42,446 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:42,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:42,447 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:42,447 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:42,448 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:42,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:42,575 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,576 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:42,576 INFO L194 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 [2018-08-07 10:49:42,593 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:49:42,593 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:49:42,608 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-08-07 10:49:42,609 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:42,611 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:42,629 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,630 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:42,805 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,829 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:42,829 INFO L194 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 [2018-08-07 10:49:42,845 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:49:42,845 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:49:42,876 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-08-07 10:49:42,877 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:42,880 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:42,895 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:42,908 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:42,911 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:42,911 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-08-07 10:49:42,911 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:42,912 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-08-07 10:49:42,912 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-08-07 10:49:42,913 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-08-07 10:49:42,913 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-08-07 10:49:43,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:43,003 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-08-07 10:49:43,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-08-07 10:49:43,004 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-08-07 10:49:43,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:43,005 INFO L225 Difference]: With dead ends: 25 [2018-08-07 10:49:43,006 INFO L226 Difference]: Without dead ends: 20 [2018-08-07 10:49:43,006 INFO L603 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 [2018-08-07 10:49:43,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-08-07 10:49:43,010 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-08-07 10:49:43,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-08-07 10:49:43,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-08-07 10:49:43,011 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-08-07 10:49:43,012 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:43,012 INFO L480 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-08-07 10:49:43,012 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-08-07 10:49:43,012 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-08-07 10:49:43,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-08-07 10:49:43,013 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:43,013 INFO L376 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:43,013 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]=== [2018-08-07 10:49:43,013 INFO L82 PathProgramCache]: Analyzing trace with hash 84085928, now seen corresponding path program 4 times [2018-08-07 10:49:43,014 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:43,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:43,015 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:43,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:43,015 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:43,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:43,190 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:43,190 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:43,190 INFO L194 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 [2018-08-07 10:49:43,203 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:49:43,203 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:49:43,242 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:49:43,243 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:43,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:43,317 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:43,318 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:43,702 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:43,724 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:43,724 INFO L194 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 [2018-08-07 10:49:43,741 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:49:43,741 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:49:43,762 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:49:43,762 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:43,766 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:43,797 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:43,798 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:43,810 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:43,813 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:43,813 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-08-07 10:49:43,813 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:43,814 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-08-07 10:49:43,814 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-08-07 10:49:43,814 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-08-07 10:49:43,815 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-08-07 10:49:43,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:43,902 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-08-07 10:49:43,903 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-08-07 10:49:43,903 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-08-07 10:49:43,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:43,904 INFO L225 Difference]: With dead ends: 27 [2018-08-07 10:49:43,904 INFO L226 Difference]: Without dead ends: 22 [2018-08-07 10:49:43,904 INFO L603 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 [2018-08-07 10:49:43,905 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-08-07 10:49:43,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-08-07 10:49:43,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-08-07 10:49:43,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-08-07 10:49:43,909 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-08-07 10:49:43,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:43,909 INFO L480 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-08-07 10:49:43,910 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-08-07 10:49:43,910 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-08-07 10:49:43,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-08-07 10:49:43,910 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:43,911 INFO L376 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:43,911 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]=== [2018-08-07 10:49:43,911 INFO L82 PathProgramCache]: Analyzing trace with hash 540375438, now seen corresponding path program 5 times [2018-08-07 10:49:43,911 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:43,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:43,912 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:43,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:43,913 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:43,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:44,046 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,046 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:44,046 INFO L194 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 [2018-08-07 10:49:44,062 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-08-07 10:49:44,062 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:44,116 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-08-07 10:49:44,116 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:44,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:44,150 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,150 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:44,350 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,371 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:44,371 INFO L194 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 [2018-08-07 10:49:44,387 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-08-07 10:49:44,387 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:44,425 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-08-07 10:49:44,426 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:44,429 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:44,447 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,448 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:44,484 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,485 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:44,486 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-08-07 10:49:44,486 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:44,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-08-07 10:49:44,486 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-08-07 10:49:44,487 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-08-07 10:49:44,487 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-08-07 10:49:44,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:44,577 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-08-07 10:49:44,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-08-07 10:49:44,578 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-08-07 10:49:44,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:44,579 INFO L225 Difference]: With dead ends: 29 [2018-08-07 10:49:44,579 INFO L226 Difference]: Without dead ends: 24 [2018-08-07 10:49:44,580 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-08-07 10:49:44,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-08-07 10:49:44,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-08-07 10:49:44,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-08-07 10:49:44,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-08-07 10:49:44,584 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-08-07 10:49:44,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:44,585 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-08-07 10:49:44,585 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-08-07 10:49:44,585 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-08-07 10:49:44,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-08-07 10:49:44,586 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:44,586 INFO L376 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:44,586 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]=== [2018-08-07 10:49:44,587 INFO L82 PathProgramCache]: Analyzing trace with hash 947930356, now seen corresponding path program 6 times [2018-08-07 10:49:44,587 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:44,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:44,588 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:44,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:44,588 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:44,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:44,844 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,845 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:44,845 INFO L194 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 [2018-08-07 10:49:44,853 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-08-07 10:49:44,854 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-08-07 10:49:44,875 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-08-07 10:49:44,875 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:44,877 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:44,895 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:44,895 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:45,141 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:45,168 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:45,168 INFO L194 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 [2018-08-07 10:49:45,183 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-08-07 10:49:45,184 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-08-07 10:49:45,247 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-08-07 10:49:45,247 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:45,250 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:45,264 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:45,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:45,277 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:45,278 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:45,279 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-08-07 10:49:45,279 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:45,279 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-08-07 10:49:45,280 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-08-07 10:49:45,280 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-08-07 10:49:45,280 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-08-07 10:49:45,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:45,356 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-08-07 10:49:45,356 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-08-07 10:49:45,357 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-08-07 10:49:45,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:45,357 INFO L225 Difference]: With dead ends: 31 [2018-08-07 10:49:45,358 INFO L226 Difference]: Without dead ends: 26 [2018-08-07 10:49:45,358 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-08-07 10:49:45,359 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-08-07 10:49:45,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-08-07 10:49:45,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-08-07 10:49:45,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-08-07 10:49:45,363 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-08-07 10:49:45,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:45,364 INFO L480 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-08-07 10:49:45,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-08-07 10:49:45,364 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-08-07 10:49:45,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-08-07 10:49:45,365 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:45,365 INFO L376 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:45,365 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]=== [2018-08-07 10:49:45,366 INFO L82 PathProgramCache]: Analyzing trace with hash 1766182618, now seen corresponding path program 7 times [2018-08-07 10:49:45,366 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:45,366 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:45,367 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:45,367 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:45,367 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:45,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:45,565 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:45,566 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:45,566 INFO L194 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 [2018-08-07 10:49:45,574 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:45,574 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:49:45,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:45,585 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:45,597 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:45,598 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:46,009 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:46,030 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:46,031 INFO L194 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 [2018-08-07 10:49:46,046 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:46,047 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:49:46,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:46,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:46,092 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:46,092 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:46,107 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:46,108 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:46,108 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-08-07 10:49:46,108 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:46,109 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-08-07 10:49:46,109 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-08-07 10:49:46,109 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-08-07 10:49:46,110 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-08-07 10:49:46,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:46,209 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-08-07 10:49:46,216 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-08-07 10:49:46,217 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-08-07 10:49:46,217 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:46,217 INFO L225 Difference]: With dead ends: 33 [2018-08-07 10:49:46,218 INFO L226 Difference]: Without dead ends: 28 [2018-08-07 10:49:46,218 INFO L603 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 [2018-08-07 10:49:46,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-08-07 10:49:46,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-08-07 10:49:46,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-08-07 10:49:46,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-08-07 10:49:46,223 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-08-07 10:49:46,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:46,223 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-08-07 10:49:46,223 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-08-07 10:49:46,223 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-08-07 10:49:46,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-08-07 10:49:46,224 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:46,224 INFO L376 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:46,225 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]=== [2018-08-07 10:49:46,225 INFO L82 PathProgramCache]: Analyzing trace with hash 2127591232, now seen corresponding path program 8 times [2018-08-07 10:49:46,225 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:46,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:46,226 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:49:46,226 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:46,227 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:46,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:46,712 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:46,713 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:46,713 INFO L194 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 [2018-08-07 10:49:46,721 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:49:46,722 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:46,734 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:49:46,735 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:46,736 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:46,763 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:46,763 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:47,079 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:47,099 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:47,100 INFO L194 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 [2018-08-07 10:49:47,115 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:49:47,115 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:49:47,140 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:49:47,141 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:47,144 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:47,170 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:47,170 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:47,224 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:47,227 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:47,227 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-08-07 10:49:47,227 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:47,228 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-08-07 10:49:47,228 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-08-07 10:49:47,228 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-08-07 10:49:47,229 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-08-07 10:49:47,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:47,624 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-08-07 10:49:47,625 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-08-07 10:49:47,625 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-08-07 10:49:47,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:47,626 INFO L225 Difference]: With dead ends: 35 [2018-08-07 10:49:47,626 INFO L226 Difference]: Without dead ends: 30 [2018-08-07 10:49:47,627 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-08-07 10:49:47,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-08-07 10:49:47,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-08-07 10:49:47,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-08-07 10:49:47,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-08-07 10:49:47,632 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-08-07 10:49:47,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:47,632 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-08-07 10:49:47,632 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-08-07 10:49:47,633 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-08-07 10:49:47,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-08-07 10:49:47,633 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:47,634 INFO L376 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:47,634 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]=== [2018-08-07 10:49:47,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1548918310, now seen corresponding path program 9 times [2018-08-07 10:49:47,634 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:47,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:47,635 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:47,635 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:47,635 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:47,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:47,848 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:47,848 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:47,848 INFO L194 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 [2018-08-07 10:49:47,858 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:49:47,859 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:49:47,954 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-08-07 10:49:47,954 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:47,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:47,991 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:47,991 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:48,428 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:48,448 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:48,449 INFO L194 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 [2018-08-07 10:49:48,463 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:49:48,464 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:49:48,570 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-08-07 10:49:48,570 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:48,573 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:48,585 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:48,587 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:48,603 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 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 (19)] Exception during sending of exit command (exit): Broken pipe [2018-08-07 10:49:48,605 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:48,605 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-08-07 10:49:48,605 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:48,606 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-08-07 10:49:48,606 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-08-07 10:49:48,606 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-08-07 10:49:48,607 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-08-07 10:49:48,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:48,796 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-08-07 10:49:48,798 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-08-07 10:49:48,798 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-08-07 10:49:48,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:48,799 INFO L225 Difference]: With dead ends: 37 [2018-08-07 10:49:48,799 INFO L226 Difference]: Without dead ends: 32 [2018-08-07 10:49:48,800 INFO L603 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 [2018-08-07 10:49:48,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-08-07 10:49:48,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-08-07 10:49:48,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-08-07 10:49:48,804 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-08-07 10:49:48,805 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-08-07 10:49:48,805 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:48,805 INFO L480 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-08-07 10:49:48,805 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-08-07 10:49:48,805 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-08-07 10:49:48,806 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-08-07 10:49:48,806 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:48,806 INFO L376 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:48,806 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]=== [2018-08-07 10:49:48,807 INFO L82 PathProgramCache]: Analyzing trace with hash -504978548, now seen corresponding path program 10 times [2018-08-07 10:49:48,807 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:48,807 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:48,807 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:48,808 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:48,808 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:48,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:49,046 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:49,046 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:49,046 INFO L194 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 [2018-08-07 10:49:49,055 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:49:49,055 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:49:49,066 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:49:49,066 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:49,067 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:49,094 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:49,094 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:49,579 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:49,600 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:49,600 INFO L194 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 [2018-08-07 10:49:49,636 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:49:49,637 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:49:49,660 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:49:49,660 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:49:49,664 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:49:49,689 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:49,689 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:49:49,733 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:49,735 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:49:49,735 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-08-07 10:49:49,735 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:49:49,735 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-08-07 10:49:49,735 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-08-07 10:49:49,736 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-08-07 10:49:49,736 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-08-07 10:49:49,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:49:49,862 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-08-07 10:49:49,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-08-07 10:49:49,863 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-08-07 10:49:49,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:49:49,864 INFO L225 Difference]: With dead ends: 39 [2018-08-07 10:49:49,864 INFO L226 Difference]: Without dead ends: 34 [2018-08-07 10:49:49,865 INFO L603 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 [2018-08-07 10:49:49,865 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-08-07 10:49:49,868 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-08-07 10:49:49,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-08-07 10:49:49,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-08-07 10:49:49,869 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-08-07 10:49:49,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:49:49,870 INFO L480 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-08-07 10:49:49,870 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-08-07 10:49:49,870 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-08-07 10:49:49,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-08-07 10:49:49,871 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:49:49,871 INFO L376 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:49:49,871 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]=== [2018-08-07 10:49:49,872 INFO L82 PathProgramCache]: Analyzing trace with hash 1385097074, now seen corresponding path program 11 times [2018-08-07 10:49:49,872 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:49:49,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:49,873 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:49:49,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:49:49,873 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:49:49,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:49:50,132 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:49:50,133 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:49:50,133 INFO L194 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 [2018-08-07 10:49:50,140 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-08-07 10:49:50,140 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:51:13,012 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-08-07 10:51:13,013 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:51:15,986 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:51:16,015 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:51:16,016 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:51:16,519 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:51:16,523 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:51:16,523 INFO L194 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 [2018-08-07 10:51:16,539 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-08-07 10:51:16,539 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:51:16,684 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-08-07 10:51:16,684 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:51:16,689 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:51:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:51:16,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:51:16,814 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:51:16,817 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:51:16,817 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-08-07 10:51:16,817 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:51:16,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-08-07 10:51:16,818 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-08-07 10:51:16,819 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-08-07 10:51:16,820 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-08-07 10:51:17,122 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:51:17,122 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-08-07 10:51:17,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-08-07 10:51:17,127 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-08-07 10:51:17,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:51:17,128 INFO L225 Difference]: With dead ends: 41 [2018-08-07 10:51:17,128 INFO L226 Difference]: Without dead ends: 36 [2018-08-07 10:51:17,129 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-08-07 10:51:17,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-08-07 10:51:17,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-08-07 10:51:17,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-08-07 10:51:17,133 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-08-07 10:51:17,133 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-08-07 10:51:17,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:51:17,133 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-08-07 10:51:17,134 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-08-07 10:51:17,134 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-08-07 10:51:17,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-08-07 10:51:17,134 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:51:17,135 INFO L376 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:51:17,135 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]=== [2018-08-07 10:51:17,135 INFO L82 PathProgramCache]: Analyzing trace with hash 976603608, now seen corresponding path program 12 times [2018-08-07 10:51:17,135 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:51:17,136 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:51:17,136 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:51:17,137 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:51:17,137 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:51:17,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:51:17,424 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:51:17,425 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:51:17,425 INFO L194 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 [2018-08-07 10:51:17,433 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-08-07 10:51:17,433 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-08-07 10:52:58,224 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-08-07 10:52:58,225 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:52:58,863 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:52:58,887 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:52:58,888 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:52:59,410 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:52:59,431 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:52:59,431 INFO L194 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 [2018-08-07 10:52:59,446 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-08-07 10:52:59,447 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-08-07 10:52:59,619 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-08-07 10:52:59,619 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:52:59,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:52:59,647 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:52:59,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:52:59,695 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:52:59,697 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:52:59,697 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-08-07 10:52:59,697 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:52:59,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-08-07 10:52:59,698 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-08-07 10:52:59,699 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-08-07 10:52:59,699 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-08-07 10:52:59,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:52:59,873 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-08-07 10:52:59,875 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-08-07 10:52:59,875 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-08-07 10:52:59,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:52:59,876 INFO L225 Difference]: With dead ends: 43 [2018-08-07 10:52:59,877 INFO L226 Difference]: Without dead ends: 38 [2018-08-07 10:52:59,878 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-08-07 10:52:59,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-08-07 10:52:59,883 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-08-07 10:52:59,883 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-08-07 10:52:59,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-08-07 10:52:59,884 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-08-07 10:52:59,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:52:59,884 INFO L480 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-08-07 10:52:59,884 INFO L481 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-08-07 10:52:59,884 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-08-07 10:52:59,885 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-08-07 10:52:59,885 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:52:59,885 INFO L376 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:52:59,886 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]=== [2018-08-07 10:52:59,886 INFO L82 PathProgramCache]: Analyzing trace with hash -743593282, now seen corresponding path program 13 times [2018-08-07 10:52:59,886 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:52:59,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:52:59,887 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:52:59,887 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:52:59,887 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:52:59,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:53:00,224 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:00,224 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:53:00,224 INFO L194 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 [2018-08-07 10:53:00,232 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:53:00,232 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:53:00,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:53:00,245 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:53:00,260 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:00,261 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:53:00,905 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:00,927 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:53:00,927 INFO L194 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 [2018-08-07 10:53:00,945 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:53:00,945 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-08-07 10:53:00,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:53:00,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:53:00,986 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:00,987 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:53:01,043 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:01,045 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:53:01,045 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-08-07 10:53:01,046 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:53:01,046 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-08-07 10:53:01,046 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-08-07 10:53:01,047 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-08-07 10:53:01,047 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-08-07 10:53:01,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:53:01,378 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-08-07 10:53:01,378 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-08-07 10:53:01,378 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-08-07 10:53:01,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:53:01,379 INFO L225 Difference]: With dead ends: 45 [2018-08-07 10:53:01,379 INFO L226 Difference]: Without dead ends: 40 [2018-08-07 10:53:01,381 INFO L603 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 [2018-08-07 10:53:01,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-08-07 10:53:01,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-08-07 10:53:01,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-08-07 10:53:01,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-08-07 10:53:01,385 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-08-07 10:53:01,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:53:01,386 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-08-07 10:53:01,386 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-08-07 10:53:01,386 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-08-07 10:53:01,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-08-07 10:53:01,387 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:53:01,387 INFO L376 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:53:01,387 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]=== [2018-08-07 10:53:01,387 INFO L82 PathProgramCache]: Analyzing trace with hash -290395612, now seen corresponding path program 14 times [2018-08-07 10:53:01,387 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:53:01,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:53:01,388 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-08-07 10:53:01,388 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:53:01,388 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:53:01,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:53:02,350 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:02,350 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:53:02,350 INFO L194 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 [2018-08-07 10:53:02,358 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:53:02,359 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:53:02,371 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:53:02,371 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:53:02,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:53:02,398 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:02,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:53:03,110 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:03,131 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:53:03,131 INFO L194 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 [2018-08-07 10:53:03,146 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-08-07 10:53:03,146 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-08-07 10:53:03,179 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-08-07 10:53:03,179 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:53:03,183 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:53:03,200 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:03,200 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:53:03,208 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:03,210 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:53:03,210 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-08-07 10:53:03,210 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:53:03,210 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-08-07 10:53:03,211 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-08-07 10:53:03,211 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-08-07 10:53:03,211 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-08-07 10:53:03,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:53:03,424 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-08-07 10:53:03,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-08-07 10:53:03,425 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-08-07 10:53:03,425 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:53:03,426 INFO L225 Difference]: With dead ends: 47 [2018-08-07 10:53:03,426 INFO L226 Difference]: Without dead ends: 42 [2018-08-07 10:53:03,427 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-08-07 10:53:03,427 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-08-07 10:53:03,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-08-07 10:53:03,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-08-07 10:53:03,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-08-07 10:53:03,432 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-08-07 10:53:03,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:53:03,433 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-08-07 10:53:03,433 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-08-07 10:53:03,433 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-08-07 10:53:03,434 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-08-07 10:53:03,434 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:53:03,434 INFO L376 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:53:03,434 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]=== [2018-08-07 10:53:03,434 INFO L82 PathProgramCache]: Analyzing trace with hash 1440868362, now seen corresponding path program 15 times [2018-08-07 10:53:03,434 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:53:03,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:53:03,435 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:53:03,435 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:53:03,435 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:53:03,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:53:03,782 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:53:03,782 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:53:03,782 INFO L194 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 [2018-08-07 10:53:03,793 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:53:03,793 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:54:22,271 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-08-07 10:54:22,271 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:54:22,685 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:54:22,702 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:22,702 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:54:23,636 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:23,640 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:54:23,641 INFO L194 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 [2018-08-07 10:54:23,656 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-08-07 10:54:23,657 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-08-07 10:54:23,893 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-08-07 10:54:23,893 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:54:23,897 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:54:23,934 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:23,935 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:54:23,945 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:23,946 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:54:23,947 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-08-07 10:54:23,947 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:54:23,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-08-07 10:54:23,947 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-08-07 10:54:23,948 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-08-07 10:54:23,948 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-08-07 10:54:24,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:54:24,202 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-08-07 10:54:24,202 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-08-07 10:54:24,202 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-08-07 10:54:24,203 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:54:24,203 INFO L225 Difference]: With dead ends: 49 [2018-08-07 10:54:24,203 INFO L226 Difference]: Without dead ends: 44 [2018-08-07 10:54:24,204 INFO L603 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 [2018-08-07 10:54:24,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-08-07 10:54:24,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-08-07 10:54:24,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-08-07 10:54:24,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-08-07 10:54:24,209 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-08-07 10:54:24,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:54:24,209 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-08-07 10:54:24,209 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-08-07 10:54:24,209 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-08-07 10:54:24,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-08-07 10:54:24,210 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:54:24,210 INFO L376 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:54:24,211 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]=== [2018-08-07 10:54:24,211 INFO L82 PathProgramCache]: Analyzing trace with hash -1261763472, now seen corresponding path program 16 times [2018-08-07 10:54:24,211 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:54:24,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:54:24,212 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:54:24,212 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:54:24,212 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:54:24,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-08-07 10:54:24,518 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:24,518 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:54:24,518 INFO L194 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 [2018-08-07 10:54:24,526 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:54:24,526 INFO L292 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:54:24,540 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:54:24,540 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:54:24,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:54:24,552 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:24,552 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:54:25,429 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:25,449 INFO L301 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-08-07 10:54:25,449 INFO L194 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 [2018-08-07 10:54:25,464 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-08-07 10:54:25,464 INFO L292 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-08-07 10:54:25,496 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-08-07 10:54:25,496 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-08-07 10:54:25,500 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-08-07 10:54:25,563 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:25,564 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-08-07 10:54:25,570 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-08-07 10:54:25,572 INFO L313 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-08-07 10:54:25,572 INFO L328 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-08-07 10:54:25,572 INFO L255 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-08-07 10:54:25,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-08-07 10:54:25,573 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-08-07 10:54:25,573 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-08-07 10:54:25,573 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-08-07 10:54:25,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-08-07 10:54:25,869 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-08-07 10:54:25,869 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-08-07 10:54:25,869 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-08-07 10:54:25,870 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-08-07 10:54:25,870 INFO L225 Difference]: With dead ends: 51 [2018-08-07 10:54:25,871 INFO L226 Difference]: Without dead ends: 46 [2018-08-07 10:54:25,872 INFO L603 BasicCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 153 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-08-07 10:54:25,872 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-08-07 10:54:25,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-08-07 10:54:25,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-08-07 10:54:25,877 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-08-07 10:54:25,877 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-08-07 10:54:25,878 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-08-07 10:54:25,878 INFO L480 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-08-07 10:54:25,878 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-08-07 10:54:25,878 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-08-07 10:54:25,879 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-08-07 10:54:25,879 INFO L368 BasicCegarLoop]: Found error trace [2018-08-07 10:54:25,879 INFO L376 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-08-07 10:54:25,879 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_repos_ultimate_trunk_examples_svcomp_loop_acceleration_simple_true_unreach_call__i____VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-08-07 10:54:25,879 INFO L82 PathProgramCache]: Analyzing trace with hash -35741866, now seen corresponding path program 17 times [2018-08-07 10:54:25,879 INFO L69 tionRefinementEngine]: Using refinement strategy RubberTaipanRefinementStrategy [2018-08-07 10:54:25,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:54:25,880 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-08-07 10:54:25,880 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-08-07 10:54:25,880 INFO L292 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-08-07 10:54:25,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat Received shutdown request... [2018-08-07 10:54:26,142 WARN L549 AbstractCegarLoop]: Verification canceled [2018-08-07 10:54:26,147 WARN L202 ceAbstractionStarter]: Timeout [2018-08-07 10:54:26,147 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.08 10:54:26 BoogieIcfgContainer [2018-08-07 10:54:26,147 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-08-07 10:54:26,148 INFO L168 Benchmark]: Toolchain (without parser) took 286148.85 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 892.9 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -693.8 MB). Peak memory consumption was 199.0 MB. Max. memory is 7.1 GB. [2018-08-07 10:54:26,150 INFO L168 Benchmark]: CDTParser took 0.17 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. [2018-08-07 10:54:26,150 INFO L168 Benchmark]: CACSL2BoogieTranslator took 233.51 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. [2018-08-07 10:54:26,151 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.70 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. [2018-08-07 10:54:26,151 INFO L168 Benchmark]: Boogie Preprocessor took 21.22 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. [2018-08-07 10:54:26,151 INFO L168 Benchmark]: RCFGBuilder took 345.18 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 772.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -831.8 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. [2018-08-07 10:54:26,152 INFO L168 Benchmark]: TraceAbstraction took 285520.57 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 120.1 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 127.4 MB). Peak memory consumption was 247.5 MB. Max. memory is 7.1 GB. [2018-08-07 10:54:26,156 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.17 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 233.51 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 22.70 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 21.22 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 345.18 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 772.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -831.8 MB). Peak memory consumption was 26.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 285520.57 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 120.1 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 127.4 MB). Peak memory consumption was 247.5 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 analyzing trace of length 46 with TraceHistMax 18, while InterpolatingTraceCheckCraig was constructing Craig interpolants, while PredicateComparison was comparing new predicate (quantifier-free) to 13 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 18 locations, 1 error locations. TIMEOUT Result, 285.4s OverallTime, 19 OverallIterations, 18 TraceHistogramMax, 2.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 341 SDtfs, 0 SDslu, 2857 SDs, 0 SdLazy, 2091 SolverSat, 0 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 1966 GetRequests, 1612 SyntacticMatches, 49 SemanticMatches, 305 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 11.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred in iteration=18, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s AbstIntTime, 0 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 18 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 263.6s SatisfiabilityAnalysisTime, 17.3s 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-0-2018-08-07_10-54-26-167.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-0-2018-08-07_10-54-26-167.csv Completed graceful shutdown