java -Xss4m -Xmx6000000000 -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml --generate-csv --csv-dir ../../../releaseScripts/default/UAutomizer-linux/csv -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-71425fa [2018-07-20 21:30:54,282 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-07-20 21:30:54,284 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-07-20 21:30:54,295 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-07-20 21:30:54,295 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-07-20 21:30:54,296 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-07-20 21:30:54,297 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-07-20 21:30:54,299 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-07-20 21:30:54,300 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-07-20 21:30:54,301 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-07-20 21:30:54,302 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-07-20 21:30:54,302 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-07-20 21:30:54,303 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-07-20 21:30:54,304 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-07-20 21:30:54,305 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-07-20 21:30:54,305 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-07-20 21:30:54,306 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-07-20 21:30:54,308 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-07-20 21:30:54,310 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-07-20 21:30:54,311 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-07-20 21:30:54,312 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-07-20 21:30:54,313 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-07-20 21:30:54,316 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-07-20 21:30:54,316 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-07-20 21:30:54,316 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-07-20 21:30:54,317 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-07-20 21:30:54,318 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-07-20 21:30:54,319 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-07-20 21:30:54,320 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-07-20 21:30:54,321 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-07-20 21:30:54,321 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-07-20 21:30:54,322 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-07-20 21:30:54,322 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-07-20 21:30:54,322 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-07-20 21:30:54,323 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-07-20 21:30:54,324 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-07-20 21:30:54,324 INFO L98 SettingsManager]: Beginning loading settings from /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default.epf [2018-07-20 21:30:54,339 INFO L110 SettingsManager]: Loading preferences was successful [2018-07-20 21:30:54,339 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-07-20 21:30:54,340 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-07-20 21:30:54,340 INFO L133 SettingsManager]: * User list type=DISABLED [2018-07-20 21:30:54,340 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-07-20 21:30:54,340 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-07-20 21:30:54,341 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-07-20 21:30:54,341 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-07-20 21:30:54,341 INFO L133 SettingsManager]: * Log string format=TERM [2018-07-20 21:30:54,341 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-07-20 21:30:54,342 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-07-20 21:30:54,342 INFO L133 SettingsManager]: * Interval Domain=false [2018-07-20 21:30:54,342 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-07-20 21:30:54,343 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-07-20 21:30:54,343 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-07-20 21:30:54,343 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-07-20 21:30:54,343 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-07-20 21:30:54,344 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-07-20 21:30:54,344 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-07-20 21:30:54,344 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-07-20 21:30:54,344 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-07-20 21:30:54,344 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-07-20 21:30:54,345 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-07-20 21:30:54,345 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-07-20 21:30:54,345 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-20 21:30:54,345 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-07-20 21:30:54,346 INFO L133 SettingsManager]: * Interpolant automaton=TWOTRACK [2018-07-20 21:30:54,346 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-07-20 21:30:54,346 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-07-20 21:30:54,346 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-07-20 21:30:54,347 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-07-20 21:30:54,347 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-07-20 21:30:54,347 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-07-20 21:30:54,347 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-07-20 21:30:54,347 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-07-20 21:30:54,390 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-07-20 21:30:54,411 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-07-20 21:30:54,416 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-07-20 21:30:54,418 INFO L271 PluginConnector]: Initializing CDTParser... [2018-07-20 21:30:54,418 INFO L276 PluginConnector]: CDTParser initialized [2018-07-20 21:30:54,419 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-07-20 21:30:54,794 INFO L220 CDTParser]: Created temporary CDT project at /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/26e9fd233/2b5569e54dd04370bf5c4532a1474bbf/FLAG505ebc8dd [2018-07-20 21:30:54,936 INFO L276 CDTParser]: Found 1 translation units. [2018-07-20 21:30:54,937 INFO L158 CDTParser]: Scanning /storage/ultimate/trunk/examples/svcomp/loop-acceleration/simple_false-unreach-call4.i [2018-07-20 21:30:54,946 INFO L324 CDTParser]: About to delete temporary CDT project at /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/26e9fd233/2b5569e54dd04370bf5c4532a1474bbf/FLAG505ebc8dd [2018-07-20 21:30:54,960 INFO L332 CDTParser]: Successfully deleted /storage/ultimate/releaseScripts/default/UAutomizer-linux/data/26e9fd233/2b5569e54dd04370bf5c4532a1474bbf [2018-07-20 21:30:54,968 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-07-20 21:30:54,974 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-07-20 21:30:54,975 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-07-20 21:30:54,975 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-07-20 21:30:54,983 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-07-20 21:30:54,983 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:30:54" (1/1) ... [2018-07-20 21:30:54,985 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ed924c1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:54, skipping insertion in model container [2018-07-20 21:30:54,985 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:30:54" (1/1) ... [2018-07-20 21:30:55,120 INFO L179 PRDispatcher]: Starting pre-run dispatcher in SV-COMP mode [2018-07-20 21:30:55,159 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-20 21:30:55,176 INFO L422 MainDispatcher]: Starting main dispatcher in SV-COMP mode [2018-07-20 21:30:55,179 INFO L175 PostProcessor]: Settings: Checked method=main [2018-07-20 21:30:55,197 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55 WrapperNode [2018-07-20 21:30:55,197 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-07-20 21:30:55,198 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-07-20 21:30:55,199 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-07-20 21:30:55,199 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-07-20 21:30:55,209 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,215 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,221 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-07-20 21:30:55,221 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-07-20 21:30:55,221 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-07-20 21:30:55,222 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-07-20 21:30:55,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,231 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,232 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,232 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,234 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,239 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,239 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... [2018-07-20 21:30:55,241 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-07-20 21:30:55,242 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-07-20 21:30:55,242 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-07-20 21:30:55,242 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-07-20 21:30:55,243 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (1/1) ... No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-07-20 21:30:55,307 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-07-20 21:30:55,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-07-20 21:30:55,308 INFO L130 BoogieDeclarations]: Found specification of procedure __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assert [2018-07-20 21:30:55,308 INFO L138 BoogieDeclarations]: Found implementation of procedure __U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assert [2018-07-20 21:30:55,308 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-07-20 21:30:55,308 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-07-20 21:30:55,308 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-07-20 21:30:55,309 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-07-20 21:30:55,687 INFO L261 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-07-20 21:30:55,688 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:30:55 BoogieIcfgContainer [2018-07-20 21:30:55,688 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-07-20 21:30:55,689 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-07-20 21:30:55,689 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-07-20 21:30:55,692 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-07-20 21:30:55,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:30:54" (1/3) ... [2018-07-20 21:30:55,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19b7a1f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:30:55, skipping insertion in model container [2018-07-20 21:30:55,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:30:55" (2/3) ... [2018-07-20 21:30:55,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19b7a1f8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:30:55, skipping insertion in model container [2018-07-20 21:30:55,694 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:30:55" (3/3) ... [2018-07-20 21:30:55,695 INFO L112 eAbstractionObserver]: Analyzing ICFG simple_false-unreach-call4.i [2018-07-20 21:30:55,704 INFO L132 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-07-20 21:30:55,712 INFO L144 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-07-20 21:30:55,762 INFO L128 ementStrategyFactory]: Using default assertion order modulation [2018-07-20 21:30:55,762 INFO L373 AbstractCegarLoop]: Interprodecural is true [2018-07-20 21:30:55,763 INFO L374 AbstractCegarLoop]: Hoare is true [2018-07-20 21:30:55,763 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-07-20 21:30:55,763 INFO L376 AbstractCegarLoop]: Backedges is TWOTRACK [2018-07-20 21:30:55,763 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-07-20 21:30:55,763 INFO L378 AbstractCegarLoop]: Difference is false [2018-07-20 21:30:55,763 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-07-20 21:30:55,764 INFO L384 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-07-20 21:30:55,778 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states. [2018-07-20 21:30:55,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-07-20 21:30:55,784 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:55,785 INFO L358 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:55,786 INFO L414 AbstractCegarLoop]: === Iteration 1 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:55,791 INFO L82 PathProgramCache]: Analyzing trace with hash 314686959, now seen corresponding path program 1 times [2018-07-20 21:30:55,793 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:55,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:55,840 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:55,840 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:55,840 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:55,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:55,885 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:55,886 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 21:30:55,887 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-07-20 21:30:55,887 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 21:30:55,888 INFO L450 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-07-20 21:30:55,903 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-07-20 21:30:55,903 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-07-20 21:30:55,906 INFO L87 Difference]: Start difference. First operand 18 states. Second operand 2 states. [2018-07-20 21:30:55,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:55,938 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2018-07-20 21:30:55,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-07-20 21:30:55,941 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-07-20 21:30:55,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:55,951 INFO L225 Difference]: With dead ends: 29 [2018-07-20 21:30:55,951 INFO L226 Difference]: Without dead ends: 12 [2018-07-20 21:30:55,959 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-07-20 21:30:55,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2018-07-20 21:30:55,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2018-07-20 21:30:55,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2018-07-20 21:30:55,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2018-07-20 21:30:55,997 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2018-07-20 21:30:55,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:55,998 INFO L471 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2018-07-20 21:30:55,998 INFO L472 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-07-20 21:30:55,998 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2018-07-20 21:30:55,998 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-07-20 21:30:55,998 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:55,999 INFO L358 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:55,999 INFO L414 AbstractCegarLoop]: === Iteration 2 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:55,999 INFO L82 PathProgramCache]: Analyzing trace with hash 926255632, now seen corresponding path program 1 times [2018-07-20 21:30:55,999 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:56,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:56,001 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:56,001 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:56,001 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:56,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:56,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:56,153 INFO L309 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-07-20 21:30:56,153 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-07-20 21:30:56,153 INFO L254 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-07-20 21:30:56,154 INFO L450 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-07-20 21:30:56,155 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-07-20 21:30:56,155 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-07-20 21:30:56,155 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 3 states. [2018-07-20 21:30:56,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:56,217 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2018-07-20 21:30:56,217 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-07-20 21:30:56,217 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-07-20 21:30:56,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:56,218 INFO L225 Difference]: With dead ends: 19 [2018-07-20 21:30:56,218 INFO L226 Difference]: Without dead ends: 14 [2018-07-20 21:30:56,219 INFO L578 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 [2018-07-20 21:30:56,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-07-20 21:30:56,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-07-20 21:30:56,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-07-20 21:30:56,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2018-07-20 21:30:56,228 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2018-07-20 21:30:56,228 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:56,228 INFO L471 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2018-07-20 21:30:56,228 INFO L472 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-07-20 21:30:56,229 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2018-07-20 21:30:56,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2018-07-20 21:30:56,229 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:56,229 INFO L358 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:56,230 INFO L414 AbstractCegarLoop]: === Iteration 3 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:56,230 INFO L82 PathProgramCache]: Analyzing trace with hash -1883357962, now seen corresponding path program 1 times [2018-07-20 21:30:56,230 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:56,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:56,231 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:56,231 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:56,231 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:56,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:56,350 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:56,350 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:56,351 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:30:56,351 INFO L199 CegarAbsIntRunner]: Running AI on error trace of length 14 with the following transitions: [2018-07-20 21:30:56,353 INFO L201 CegarAbsIntRunner]: [0], [1], [4], [6], [15], [19], [23], [25], [31], [32], [33], [35] [2018-07-20 21:30:56,391 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, OctagonDomain] [2018-07-20 21:30:56,391 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-07-20 21:30:56,493 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-07-20 21:30:56,897 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-07-20 21:30:56,898 INFO L272 AbstractInterpreter]: Visited 12 different actions 95 times. Merged at 3 different actions 37 times. Widened at 1 different actions 9 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-07-20 21:30:56,916 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-07-20 21:30:56,916 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:56,916 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:30:56,926 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:56,926 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:30:56,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:56,954 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:56,996 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:56,996 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:57,108 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,127 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,128 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:30:57,142 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:57,142 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:30:57,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:57,169 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:57,216 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,219 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:57,226 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,229 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:30:57,230 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4, 4, 4] total 6 [2018-07-20 21:30:57,230 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:30:57,230 INFO L450 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-07-20 21:30:57,231 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-07-20 21:30:57,231 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-07-20 21:30:57,231 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2018-07-20 21:30:57,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:57,289 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2018-07-20 21:30:57,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-07-20 21:30:57,290 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 13 [2018-07-20 21:30:57,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:57,291 INFO L225 Difference]: With dead ends: 21 [2018-07-20 21:30:57,291 INFO L226 Difference]: Without dead ends: 16 [2018-07-20 21:30:57,291 INFO L578 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 [2018-07-20 21:30:57,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-07-20 21:30:57,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-07-20 21:30:57,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-07-20 21:30:57,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2018-07-20 21:30:57,295 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2018-07-20 21:30:57,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:57,296 INFO L471 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2018-07-20 21:30:57,296 INFO L472 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-07-20 21:30:57,296 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2018-07-20 21:30:57,296 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-07-20 21:30:57,296 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:57,296 INFO L358 BasicCegarLoop]: trace histogram [3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:57,296 INFO L414 AbstractCegarLoop]: === Iteration 4 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:57,297 INFO L82 PathProgramCache]: Analyzing trace with hash -387592612, now seen corresponding path program 2 times [2018-07-20 21:30:57,297 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:57,297 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:57,298 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:30:57,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:57,298 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:57,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:57,449 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,449 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,450 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:30:57,450 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:30:57,450 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:30:57,450 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,450 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:30:57,462 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:30:57,462 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:30:57,475 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:30:57,475 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:57,480 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:57,713 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,732 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,732 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:30:57,749 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:30:57,749 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:30:57,773 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:30:57,773 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:57,777 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:57,806 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,806 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:57,819 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,820 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:30:57,821 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 5] total 8 [2018-07-20 21:30:57,821 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:30:57,821 INFO L450 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-07-20 21:30:57,821 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-07-20 21:30:57,822 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-07-20 21:30:57,822 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 5 states. [2018-07-20 21:30:57,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:57,884 INFO L93 Difference]: Finished difference Result 23 states and 23 transitions. [2018-07-20 21:30:57,884 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-07-20 21:30:57,884 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2018-07-20 21:30:57,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:57,885 INFO L225 Difference]: With dead ends: 23 [2018-07-20 21:30:57,885 INFO L226 Difference]: Without dead ends: 18 [2018-07-20 21:30:57,886 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 55 SyntacticMatches, 3 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2018-07-20 21:30:57,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-07-20 21:30:57,889 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2018-07-20 21:30:57,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2018-07-20 21:30:57,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2018-07-20 21:30:57,890 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2018-07-20 21:30:57,890 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:57,890 INFO L471 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2018-07-20 21:30:57,890 INFO L472 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-07-20 21:30:57,890 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2018-07-20 21:30:57,891 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-07-20 21:30:57,891 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:57,891 INFO L358 BasicCegarLoop]: trace histogram [4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:57,891 INFO L414 AbstractCegarLoop]: === Iteration 5 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:57,891 INFO L82 PathProgramCache]: Analyzing trace with hash -1771135422, now seen corresponding path program 3 times [2018-07-20 21:30:57,892 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:57,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:57,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:30:57,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:57,893 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:57,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:57,983 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:57,983 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,983 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:30:57,983 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:30:57,983 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:30:57,984 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:57,984 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:30:57,997 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:30:57,998 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:30:58,056 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-07-20 21:30:58,056 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:58,059 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:58,106 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,106 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:58,180 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,207 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:58,207 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:30:58,221 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:30:58,221 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:30:58,249 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2018-07-20 21:30:58,250 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:58,254 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:58,308 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,308 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:58,325 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,327 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:30:58,327 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6, 6, 6] total 10 [2018-07-20 21:30:58,327 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:30:58,327 INFO L450 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-07-20 21:30:58,328 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-07-20 21:30:58,328 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-07-20 21:30:58,328 INFO L87 Difference]: Start difference. First operand 18 states and 18 transitions. Second operand 6 states. [2018-07-20 21:30:58,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:58,373 INFO L93 Difference]: Finished difference Result 25 states and 25 transitions. [2018-07-20 21:30:58,373 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-07-20 21:30:58,373 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2018-07-20 21:30:58,374 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:58,374 INFO L225 Difference]: With dead ends: 25 [2018-07-20 21:30:58,374 INFO L226 Difference]: Without dead ends: 20 [2018-07-20 21:30:58,374 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 62 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2018-07-20 21:30:58,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2018-07-20 21:30:58,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2018-07-20 21:30:58,377 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2018-07-20 21:30:58,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2018-07-20 21:30:58,377 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 17 [2018-07-20 21:30:58,378 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:58,378 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2018-07-20 21:30:58,378 INFO L472 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-07-20 21:30:58,378 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2018-07-20 21:30:58,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-07-20 21:30:58,379 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:58,379 INFO L358 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:58,379 INFO L414 AbstractCegarLoop]: === Iteration 6 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:58,379 INFO L82 PathProgramCache]: Analyzing trace with hash 84085928, now seen corresponding path program 4 times [2018-07-20 21:30:58,379 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:58,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:58,380 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:30:58,380 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:58,380 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:58,390 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:58,584 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,584 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:58,584 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:30:58,584 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:30:58,584 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:30:58,584 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:58,585 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) [2018-07-20 21:30:58,600 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:30:58,601 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:30:58,629 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:30:58,630 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:58,631 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:58,699 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:58,699 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:58,981 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:59,003 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:59,003 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:30:59,017 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:30:59,018 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:30:59,037 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:30:59,037 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:30:59,040 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:30:59,054 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:59,055 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:30:59,060 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:59,062 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:30:59,062 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7, 7, 7] total 12 [2018-07-20 21:30:59,062 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:30:59,062 INFO L450 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-07-20 21:30:59,062 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-07-20 21:30:59,063 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-07-20 21:30:59,063 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 7 states. [2018-07-20 21:30:59,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:30:59,156 INFO L93 Difference]: Finished difference Result 27 states and 27 transitions. [2018-07-20 21:30:59,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-07-20 21:30:59,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2018-07-20 21:30:59,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:30:59,157 INFO L225 Difference]: With dead ends: 27 [2018-07-20 21:30:59,158 INFO L226 Difference]: Without dead ends: 22 [2018-07-20 21:30:59,158 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2018-07-20 21:30:59,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-07-20 21:30:59,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2018-07-20 21:30:59,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2018-07-20 21:30:59,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 22 transitions. [2018-07-20 21:30:59,162 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 22 transitions. Word has length 19 [2018-07-20 21:30:59,162 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:30:59,162 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 22 transitions. [2018-07-20 21:30:59,162 INFO L472 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-07-20 21:30:59,162 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 22 transitions. [2018-07-20 21:30:59,162 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2018-07-20 21:30:59,163 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:30:59,163 INFO L358 BasicCegarLoop]: trace histogram [6, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:30:59,163 INFO L414 AbstractCegarLoop]: === Iteration 7 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:30:59,163 INFO L82 PathProgramCache]: Analyzing trace with hash 540375438, now seen corresponding path program 5 times [2018-07-20 21:30:59,163 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:30:59,163 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:59,164 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:30:59,164 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:30:59,164 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:30:59,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:30:59,296 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:30:59,296 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:59,296 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:30:59,296 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:30:59,296 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:30:59,296 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:30:59,297 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:30:59,304 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:30:59,304 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:00,076 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-07-20 21:31:00,076 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:00,093 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:00,103 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,103 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:00,316 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,346 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:00,346 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:00,365 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:31:00,366 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:00,407 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2018-07-20 21:31:00,408 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:00,410 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:00,418 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,418 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:00,423 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,425 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:00,425 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8, 8, 8] total 14 [2018-07-20 21:31:00,425 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:00,425 INFO L450 AbstractCegarLoop]: Interpolant automaton has 8 states [2018-07-20 21:31:00,426 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2018-07-20 21:31:00,426 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-07-20 21:31:00,426 INFO L87 Difference]: Start difference. First operand 22 states and 22 transitions. Second operand 8 states. [2018-07-20 21:31:00,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:00,494 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2018-07-20 21:31:00,495 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-07-20 21:31:00,495 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2018-07-20 21:31:00,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:00,496 INFO L225 Difference]: With dead ends: 29 [2018-07-20 21:31:00,496 INFO L226 Difference]: Without dead ends: 24 [2018-07-20 21:31:00,496 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 76 SyntacticMatches, 3 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2018-07-20 21:31:00,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-07-20 21:31:00,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-07-20 21:31:00,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-07-20 21:31:00,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 24 transitions. [2018-07-20 21:31:00,500 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 24 transitions. Word has length 21 [2018-07-20 21:31:00,500 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:00,501 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 24 transitions. [2018-07-20 21:31:00,501 INFO L472 AbstractCegarLoop]: Interpolant automaton has 8 states. [2018-07-20 21:31:00,501 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 24 transitions. [2018-07-20 21:31:00,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-07-20 21:31:00,501 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:00,502 INFO L358 BasicCegarLoop]: trace histogram [7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:00,502 INFO L414 AbstractCegarLoop]: === Iteration 8 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:00,502 INFO L82 PathProgramCache]: Analyzing trace with hash 947930356, now seen corresponding path program 6 times [2018-07-20 21:31:00,502 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:00,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:00,503 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:00,503 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:00,503 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:00,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:00,660 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,660 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:00,660 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:00,660 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:00,660 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:00,660 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:00,660 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:00,667 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:31:00,667 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:31:00,713 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-07-20 21:31:00,713 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:00,714 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:00,730 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,731 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:00,853 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,872 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:00,872 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:00,886 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:31:00,886 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:31:00,939 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2018-07-20 21:31:00,939 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:00,941 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:00,951 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,952 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:00,960 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:00,961 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:00,962 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9, 9, 9] total 16 [2018-07-20 21:31:00,962 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:00,962 INFO L450 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-07-20 21:31:00,962 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-07-20 21:31:00,962 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-07-20 21:31:00,963 INFO L87 Difference]: Start difference. First operand 24 states and 24 transitions. Second operand 9 states. [2018-07-20 21:31:01,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:01,004 INFO L93 Difference]: Finished difference Result 31 states and 31 transitions. [2018-07-20 21:31:01,004 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-07-20 21:31:01,004 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-07-20 21:31:01,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:01,005 INFO L225 Difference]: With dead ends: 31 [2018-07-20 21:31:01,005 INFO L226 Difference]: Without dead ends: 26 [2018-07-20 21:31:01,006 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 83 SyntacticMatches, 3 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=78, Invalid=162, Unknown=0, NotChecked=0, Total=240 [2018-07-20 21:31:01,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2018-07-20 21:31:01,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2018-07-20 21:31:01,009 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2018-07-20 21:31:01,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2018-07-20 21:31:01,010 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 23 [2018-07-20 21:31:01,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:01,011 INFO L471 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2018-07-20 21:31:01,011 INFO L472 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-07-20 21:31:01,011 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2018-07-20 21:31:01,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2018-07-20 21:31:01,012 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:01,012 INFO L358 BasicCegarLoop]: trace histogram [8, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:01,012 INFO L414 AbstractCegarLoop]: === Iteration 9 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:01,012 INFO L82 PathProgramCache]: Analyzing trace with hash 1766182618, now seen corresponding path program 7 times [2018-07-20 21:31:01,012 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:01,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:01,013 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:01,013 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:01,013 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:01,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:01,187 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,187 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:01,187 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:01,187 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:01,187 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:01,187 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:01,187 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:01,193 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:31:01,193 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:31:01,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:01,201 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:01,228 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,229 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:01,498 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,517 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:01,517 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:01,530 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:31:01,530 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:31:01,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:01,547 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:01,570 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,570 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:01,581 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,582 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:01,582 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10, 10, 10] total 18 [2018-07-20 21:31:01,582 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:01,582 INFO L450 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-07-20 21:31:01,583 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-07-20 21:31:01,583 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-07-20 21:31:01,583 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 10 states. [2018-07-20 21:31:01,627 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:01,628 INFO L93 Difference]: Finished difference Result 33 states and 33 transitions. [2018-07-20 21:31:01,635 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-07-20 21:31:01,635 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2018-07-20 21:31:01,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:01,636 INFO L225 Difference]: With dead ends: 33 [2018-07-20 21:31:01,636 INFO L226 Difference]: Without dead ends: 28 [2018-07-20 21:31:01,636 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 90 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2018-07-20 21:31:01,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2018-07-20 21:31:01,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2018-07-20 21:31:01,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-07-20 21:31:01,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 28 transitions. [2018-07-20 21:31:01,641 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 28 transitions. Word has length 25 [2018-07-20 21:31:01,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:01,641 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 28 transitions. [2018-07-20 21:31:01,641 INFO L472 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-07-20 21:31:01,641 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 28 transitions. [2018-07-20 21:31:01,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-07-20 21:31:01,642 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:01,642 INFO L358 BasicCegarLoop]: trace histogram [9, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:01,642 INFO L414 AbstractCegarLoop]: === Iteration 10 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:01,643 INFO L82 PathProgramCache]: Analyzing trace with hash 2127591232, now seen corresponding path program 8 times [2018-07-20 21:31:01,643 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:01,643 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:01,644 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:31:01,644 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:01,644 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:01,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:01,833 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,833 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:01,833 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:01,833 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:01,833 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:01,833 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:01,834 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:01,839 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:31:01,839 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:01,854 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:31:01,854 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:01,856 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:01,876 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:01,876 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:02,067 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:02,086 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:02,086 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:02,099 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:31:02,100 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:02,119 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:31:02,119 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:02,122 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:02,194 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:02,194 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:02,257 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:02,259 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:02,259 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11, 11, 11] total 20 [2018-07-20 21:31:02,259 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:02,260 INFO L450 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-07-20 21:31:02,260 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-07-20 21:31:02,260 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-07-20 21:31:02,260 INFO L87 Difference]: Start difference. First operand 28 states and 28 transitions. Second operand 11 states. [2018-07-20 21:31:02,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:02,474 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2018-07-20 21:31:02,475 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-07-20 21:31:02,475 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2018-07-20 21:31:02,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:02,475 INFO L225 Difference]: With dead ends: 35 [2018-07-20 21:31:02,475 INFO L226 Difference]: Without dead ends: 30 [2018-07-20 21:31:02,476 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 118 GetRequests, 97 SyntacticMatches, 3 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=118, Invalid=262, Unknown=0, NotChecked=0, Total=380 [2018-07-20 21:31:02,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-07-20 21:31:02,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2018-07-20 21:31:02,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-07-20 21:31:02,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 30 transitions. [2018-07-20 21:31:02,480 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 30 transitions. Word has length 27 [2018-07-20 21:31:02,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:02,480 INFO L471 AbstractCegarLoop]: Abstraction has 30 states and 30 transitions. [2018-07-20 21:31:02,480 INFO L472 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-07-20 21:31:02,481 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 30 transitions. [2018-07-20 21:31:02,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-07-20 21:31:02,481 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:02,481 INFO L358 BasicCegarLoop]: trace histogram [10, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:02,482 INFO L414 AbstractCegarLoop]: === Iteration 11 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:02,482 INFO L82 PathProgramCache]: Analyzing trace with hash 1548918310, now seen corresponding path program 9 times [2018-07-20 21:31:02,482 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:02,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:02,483 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:02,483 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:02,483 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:02,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:02,723 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:02,723 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:02,723 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:02,723 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:02,723 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:02,723 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:02,723 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:02,729 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:31:02,729 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:31:02,819 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-07-20 21:31:02,819 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:02,822 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:02,853 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:02,853 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:03,189 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:03,211 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:03,212 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:03,226 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:31:03,226 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:31:03,311 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-07-20 21:31:03,311 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:03,348 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:03,370 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:03,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:03,392 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:03,394 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:03,394 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12, 12, 12] total 22 [2018-07-20 21:31:03,394 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:03,394 INFO L450 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-07-20 21:31:03,394 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-07-20 21:31:03,394 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-07-20 21:31:03,395 INFO L87 Difference]: Start difference. First operand 30 states and 30 transitions. Second operand 12 states. [2018-07-20 21:31:03,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:03,531 INFO L93 Difference]: Finished difference Result 37 states and 37 transitions. [2018-07-20 21:31:03,532 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2018-07-20 21:31:03,532 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2018-07-20 21:31:03,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:03,532 INFO L225 Difference]: With dead ends: 37 [2018-07-20 21:31:03,533 INFO L226 Difference]: Without dead ends: 32 [2018-07-20 21:31:03,533 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 104 SyntacticMatches, 3 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=141, Invalid=321, Unknown=0, NotChecked=0, Total=462 [2018-07-20 21:31:03,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2018-07-20 21:31:03,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2018-07-20 21:31:03,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2018-07-20 21:31:03,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2018-07-20 21:31:03,540 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 29 [2018-07-20 21:31:03,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:03,540 INFO L471 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2018-07-20 21:31:03,540 INFO L472 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-07-20 21:31:03,540 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2018-07-20 21:31:03,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2018-07-20 21:31:03,541 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:03,541 INFO L358 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:03,541 INFO L414 AbstractCegarLoop]: === Iteration 12 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:03,541 INFO L82 PathProgramCache]: Analyzing trace with hash -504978548, now seen corresponding path program 10 times [2018-07-20 21:31:03,542 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:03,542 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:03,542 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:03,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:03,543 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:03,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:03,723 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:03,723 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:03,723 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:03,723 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:03,723 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:03,723 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:03,723 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:03,729 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:31:03,729 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:31:03,737 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:31:03,737 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:03,738 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:03,750 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:03,750 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:04,052 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:04,070 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:04,071 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:04,085 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:31:04,085 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:31:04,107 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:31:04,107 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:04,110 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:04,132 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:04,133 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:04,188 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:04,191 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:04,191 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13, 13, 13] total 24 [2018-07-20 21:31:04,191 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:04,191 INFO L450 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-07-20 21:31:04,192 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-07-20 21:31:04,192 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-07-20 21:31:04,192 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 13 states. [2018-07-20 21:31:04,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:04,329 INFO L93 Difference]: Finished difference Result 39 states and 39 transitions. [2018-07-20 21:31:04,329 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-07-20 21:31:04,329 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2018-07-20 21:31:04,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:04,330 INFO L225 Difference]: With dead ends: 39 [2018-07-20 21:31:04,330 INFO L226 Difference]: Without dead ends: 34 [2018-07-20 21:31:04,331 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 111 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-07-20 21:31:04,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-07-20 21:31:04,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2018-07-20 21:31:04,335 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2018-07-20 21:31:04,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 34 transitions. [2018-07-20 21:31:04,335 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 34 transitions. Word has length 31 [2018-07-20 21:31:04,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:04,336 INFO L471 AbstractCegarLoop]: Abstraction has 34 states and 34 transitions. [2018-07-20 21:31:04,336 INFO L472 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-07-20 21:31:04,336 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 34 transitions. [2018-07-20 21:31:04,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2018-07-20 21:31:04,337 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:04,337 INFO L358 BasicCegarLoop]: trace histogram [12, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:04,337 INFO L414 AbstractCegarLoop]: === Iteration 13 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:04,337 INFO L82 PathProgramCache]: Analyzing trace with hash 1385097074, now seen corresponding path program 11 times [2018-07-20 21:31:04,337 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:04,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:04,338 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:04,338 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:04,338 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:04,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:04,861 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:04,861 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:04,861 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:04,861 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:04,861 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:04,861 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:04,861 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:04,872 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:31:04,872 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:46,634 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-07-20 21:31:46,634 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:46,957 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:46,989 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:47,335 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:47,354 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:47,355 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:31:47,368 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:31:47,368 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:31:47,465 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2018-07-20 21:31:47,465 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:31:47,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:31:47,497 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:47,497 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:31:47,527 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 132 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:47,528 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:31:47,528 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14, 14, 14] total 26 [2018-07-20 21:31:47,528 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:31:47,528 INFO L450 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-07-20 21:31:47,528 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-07-20 21:31:47,529 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-07-20 21:31:47,529 INFO L87 Difference]: Start difference. First operand 34 states and 34 transitions. Second operand 14 states. [2018-07-20 21:31:47,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:31:47,656 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2018-07-20 21:31:47,657 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-07-20 21:31:47,657 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 33 [2018-07-20 21:31:47,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:31:47,658 INFO L225 Difference]: With dead ends: 41 [2018-07-20 21:31:47,658 INFO L226 Difference]: Without dead ends: 36 [2018-07-20 21:31:47,659 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 118 SyntacticMatches, 3 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=193, Invalid=457, Unknown=0, NotChecked=0, Total=650 [2018-07-20 21:31:47,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-07-20 21:31:47,662 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-07-20 21:31:47,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-07-20 21:31:47,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 36 transitions. [2018-07-20 21:31:47,663 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 36 transitions. Word has length 33 [2018-07-20 21:31:47,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:31:47,663 INFO L471 AbstractCegarLoop]: Abstraction has 36 states and 36 transitions. [2018-07-20 21:31:47,663 INFO L472 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-07-20 21:31:47,663 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 36 transitions. [2018-07-20 21:31:47,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-07-20 21:31:47,664 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:31:47,664 INFO L358 BasicCegarLoop]: trace histogram [13, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:31:47,664 INFO L414 AbstractCegarLoop]: === Iteration 14 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:31:47,664 INFO L82 PathProgramCache]: Analyzing trace with hash 976603608, now seen corresponding path program 12 times [2018-07-20 21:31:47,664 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:31:47,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:47,665 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:31:47,665 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:31:47,665 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:31:47,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:31:47,874 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:31:47,874 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:47,874 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:31:47,874 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:31:47,874 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:31:47,874 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:31:47,875 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:31:47,880 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:31:47,880 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:32:01,016 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-07-20 21:32:01,016 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:01,024 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:01,079 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:01,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:01,523 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:01,543 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:01,543 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:32:01,557 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:32:01,557 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:32:01,695 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2018-07-20 21:32:01,695 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:01,698 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:01,710 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:01,711 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:01,766 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:01,767 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:32:01,767 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15, 15, 15] total 28 [2018-07-20 21:32:01,767 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:32:01,768 INFO L450 AbstractCegarLoop]: Interpolant automaton has 15 states [2018-07-20 21:32:01,768 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2018-07-20 21:32:01,768 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-07-20 21:32:01,768 INFO L87 Difference]: Start difference. First operand 36 states and 36 transitions. Second operand 15 states. [2018-07-20 21:32:01,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:32:01,862 INFO L93 Difference]: Finished difference Result 43 states and 43 transitions. [2018-07-20 21:32:01,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-07-20 21:32:01,863 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2018-07-20 21:32:01,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:32:01,863 INFO L225 Difference]: With dead ends: 43 [2018-07-20 21:32:01,864 INFO L226 Difference]: Without dead ends: 38 [2018-07-20 21:32:01,864 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 125 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=222, Invalid=534, Unknown=0, NotChecked=0, Total=756 [2018-07-20 21:32:01,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-07-20 21:32:01,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2018-07-20 21:32:01,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2018-07-20 21:32:01,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2018-07-20 21:32:01,870 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 35 [2018-07-20 21:32:01,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:32:01,870 INFO L471 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2018-07-20 21:32:01,871 INFO L472 AbstractCegarLoop]: Interpolant automaton has 15 states. [2018-07-20 21:32:01,871 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2018-07-20 21:32:01,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2018-07-20 21:32:01,871 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:32:01,872 INFO L358 BasicCegarLoop]: trace histogram [14, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:32:01,872 INFO L414 AbstractCegarLoop]: === Iteration 15 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:32:01,872 INFO L82 PathProgramCache]: Analyzing trace with hash -743593282, now seen corresponding path program 13 times [2018-07-20 21:32:01,872 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:32:01,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:01,873 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:32:01,873 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:01,873 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:32:01,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:02,216 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:02,217 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:02,217 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:32:02,217 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:32:02,217 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:32:02,217 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:02,217 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:32:02,223 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:32:02,223 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:32:02,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:02,233 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:02,242 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:02,242 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:02,673 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:02,692 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:02,692 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:32:02,705 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:32:02,706 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:32:02,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:02,731 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:02,738 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:02,738 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:02,758 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:02,760 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:32:02,760 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16, 16, 16] total 30 [2018-07-20 21:32:02,760 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:32:02,760 INFO L450 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-07-20 21:32:02,760 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-07-20 21:32:02,761 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-07-20 21:32:02,761 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 16 states. [2018-07-20 21:32:02,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:32:02,851 INFO L93 Difference]: Finished difference Result 45 states and 45 transitions. [2018-07-20 21:32:02,851 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-07-20 21:32:02,852 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2018-07-20 21:32:02,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:32:02,853 INFO L225 Difference]: With dead ends: 45 [2018-07-20 21:32:02,853 INFO L226 Difference]: Without dead ends: 40 [2018-07-20 21:32:02,854 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 132 SyntacticMatches, 3 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=253, Invalid=617, Unknown=0, NotChecked=0, Total=870 [2018-07-20 21:32:02,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2018-07-20 21:32:02,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2018-07-20 21:32:02,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2018-07-20 21:32:02,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 40 transitions. [2018-07-20 21:32:02,858 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 40 transitions. Word has length 37 [2018-07-20 21:32:02,861 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:32:02,861 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 40 transitions. [2018-07-20 21:32:02,861 INFO L472 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-07-20 21:32:02,861 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 40 transitions. [2018-07-20 21:32:02,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2018-07-20 21:32:02,862 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:32:02,862 INFO L358 BasicCegarLoop]: trace histogram [15, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:32:02,862 INFO L414 AbstractCegarLoop]: === Iteration 16 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:32:02,863 INFO L82 PathProgramCache]: Analyzing trace with hash -290395612, now seen corresponding path program 14 times [2018-07-20 21:32:02,863 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:32:02,863 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:02,863 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:32:02,864 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:02,864 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:32:02,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:03,058 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:03,058 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:03,058 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:32:03,058 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:32:03,058 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:32:03,059 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:03,059 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:32:03,065 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:32:03,065 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:32:03,075 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:32:03,075 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:03,076 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:03,084 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:03,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:03,575 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:03,593 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:03,593 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:32:03,607 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:32:03,607 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:32:03,631 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:32:03,632 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:03,634 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:03,667 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:03,667 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:03,674 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:03,675 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:32:03,675 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17, 17, 17] total 32 [2018-07-20 21:32:03,675 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:32:03,675 INFO L450 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-07-20 21:32:03,676 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-07-20 21:32:03,676 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-07-20 21:32:03,676 INFO L87 Difference]: Start difference. First operand 40 states and 40 transitions. Second operand 17 states. [2018-07-20 21:32:03,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:32:03,782 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2018-07-20 21:32:03,782 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-07-20 21:32:03,783 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2018-07-20 21:32:03,783 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:32:03,783 INFO L225 Difference]: With dead ends: 47 [2018-07-20 21:32:03,783 INFO L226 Difference]: Without dead ends: 42 [2018-07-20 21:32:03,784 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 139 SyntacticMatches, 3 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=286, Invalid=706, Unknown=0, NotChecked=0, Total=992 [2018-07-20 21:32:03,784 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2018-07-20 21:32:03,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2018-07-20 21:32:03,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-07-20 21:32:03,788 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 42 transitions. [2018-07-20 21:32:03,788 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 42 transitions. Word has length 39 [2018-07-20 21:32:03,789 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:32:03,789 INFO L471 AbstractCegarLoop]: Abstraction has 42 states and 42 transitions. [2018-07-20 21:32:03,789 INFO L472 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-07-20 21:32:03,789 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 42 transitions. [2018-07-20 21:32:03,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-07-20 21:32:03,790 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:32:03,790 INFO L358 BasicCegarLoop]: trace histogram [16, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:32:03,790 INFO L414 AbstractCegarLoop]: === Iteration 17 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:32:03,790 INFO L82 PathProgramCache]: Analyzing trace with hash 1440868362, now seen corresponding path program 15 times [2018-07-20 21:32:03,790 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:32:03,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:03,793 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:32:03,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:03,793 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:32:03,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:04,219 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:04,219 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:04,219 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:32:04,219 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:32:04,219 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:32:04,219 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:04,219 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:32:04,224 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:32:04,225 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:32:06,519 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-07-20 21:32:06,519 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:06,622 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:06,646 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:06,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:07,178 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:07,197 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:07,197 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:32:07,211 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:32:07,212 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:32:07,399 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2018-07-20 21:32:07,399 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:07,402 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:07,425 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:07,425 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:07,482 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:07,483 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:32:07,484 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18, 18, 18] total 34 [2018-07-20 21:32:07,484 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:32:07,484 INFO L450 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-07-20 21:32:07,484 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-07-20 21:32:07,485 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-07-20 21:32:07,485 INFO L87 Difference]: Start difference. First operand 42 states and 42 transitions. Second operand 18 states. [2018-07-20 21:32:07,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:32:07,666 INFO L93 Difference]: Finished difference Result 49 states and 49 transitions. [2018-07-20 21:32:07,666 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-07-20 21:32:07,666 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2018-07-20 21:32:07,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:32:07,667 INFO L225 Difference]: With dead ends: 49 [2018-07-20 21:32:07,667 INFO L226 Difference]: Without dead ends: 44 [2018-07-20 21:32:07,667 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=321, Invalid=801, Unknown=0, NotChecked=0, Total=1122 [2018-07-20 21:32:07,667 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2018-07-20 21:32:07,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2018-07-20 21:32:07,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-07-20 21:32:07,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2018-07-20 21:32:07,672 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 41 [2018-07-20 21:32:07,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:32:07,672 INFO L471 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2018-07-20 21:32:07,673 INFO L472 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-07-20 21:32:07,673 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2018-07-20 21:32:07,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-07-20 21:32:07,673 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:32:07,673 INFO L358 BasicCegarLoop]: trace histogram [17, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:32:07,673 INFO L414 AbstractCegarLoop]: === Iteration 18 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:32:07,674 INFO L82 PathProgramCache]: Analyzing trace with hash -1261763472, now seen corresponding path program 16 times [2018-07-20 21:32:07,674 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:32:07,674 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:07,675 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:32:07,675 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:07,675 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:32:07,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:08,220 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:08,220 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:08,220 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:32:08,220 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:32:08,220 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:32:08,220 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:08,220 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:32:08,226 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:32:08,226 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:32:08,236 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:32:08,237 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:08,238 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:08,247 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:08,247 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:08,937 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:08,955 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:08,955 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:32:08,969 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:32:08,969 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:32:08,995 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:32:08,995 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:32:08,998 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:32:09,021 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:09,021 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:32:09,028 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:09,029 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:32:09,029 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19, 19, 19] total 36 [2018-07-20 21:32:09,030 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:32:09,030 INFO L450 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-07-20 21:32:09,030 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-07-20 21:32:09,031 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=358, Invalid=902, Unknown=0, NotChecked=0, Total=1260 [2018-07-20 21:32:09,031 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 19 states. [2018-07-20 21:32:09,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:32:09,230 INFO L93 Difference]: Finished difference Result 51 states and 51 transitions. [2018-07-20 21:32:09,231 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-07-20 21:32:09,231 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2018-07-20 21:32:09,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:32:09,231 INFO L225 Difference]: With dead ends: 51 [2018-07-20 21:32:09,232 INFO L226 Difference]: Without dead ends: 46 [2018-07-20 21:32:09,232 INFO L578 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 [2018-07-20 21:32:09,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-07-20 21:32:09,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2018-07-20 21:32:09,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2018-07-20 21:32:09,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 46 transitions. [2018-07-20 21:32:09,237 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 46 transitions. Word has length 43 [2018-07-20 21:32:09,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:32:09,237 INFO L471 AbstractCegarLoop]: Abstraction has 46 states and 46 transitions. [2018-07-20 21:32:09,238 INFO L472 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-07-20 21:32:09,238 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 46 transitions. [2018-07-20 21:32:09,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2018-07-20 21:32:09,238 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:32:09,238 INFO L358 BasicCegarLoop]: trace histogram [18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:32:09,239 INFO L414 AbstractCegarLoop]: === Iteration 19 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:32:09,239 INFO L82 PathProgramCache]: Analyzing trace with hash -35741866, now seen corresponding path program 17 times [2018-07-20 21:32:09,239 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:32:09,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:09,240 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:32:09,240 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:32:09,240 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:32:09,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:32:09,515 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:32:09,516 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:09,516 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:32:09,516 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:32:09,516 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:32:09,516 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:32:09,516 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:32:09,521 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:32:09,521 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:34:28,744 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-07-20 21:34:28,745 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:28,806 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:28,813 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:28,814 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:29,481 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:29,501 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:29,501 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:29,515 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:34:29,515 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:34:42,151 INFO L242 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2018-07-20 21:34:42,152 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:42,156 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:42,181 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:42,181 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:42,242 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:42,250 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:42,250 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20, 20, 20] total 38 [2018-07-20 21:34:42,250 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:42,251 INFO L450 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-07-20 21:34:42,251 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-07-20 21:34:42,252 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-07-20 21:34:42,252 INFO L87 Difference]: Start difference. First operand 46 states and 46 transitions. Second operand 20 states. [2018-07-20 21:34:42,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:42,838 INFO L93 Difference]: Finished difference Result 53 states and 53 transitions. [2018-07-20 21:34:42,839 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-07-20 21:34:42,839 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2018-07-20 21:34:42,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:42,839 INFO L225 Difference]: With dead ends: 53 [2018-07-20 21:34:42,839 INFO L226 Difference]: Without dead ends: 48 [2018-07-20 21:34:42,840 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 199 GetRequests, 160 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=397, Invalid=1009, Unknown=0, NotChecked=0, Total=1406 [2018-07-20 21:34:42,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-07-20 21:34:42,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-07-20 21:34:42,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-07-20 21:34:42,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 48 transitions. [2018-07-20 21:34:42,844 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 48 transitions. Word has length 45 [2018-07-20 21:34:42,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:42,844 INFO L471 AbstractCegarLoop]: Abstraction has 48 states and 48 transitions. [2018-07-20 21:34:42,844 INFO L472 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-07-20 21:34:42,844 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 48 transitions. [2018-07-20 21:34:42,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-07-20 21:34:42,844 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:42,845 INFO L358 BasicCegarLoop]: trace histogram [19, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:42,845 INFO L414 AbstractCegarLoop]: === Iteration 20 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:42,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1349982396, now seen corresponding path program 18 times [2018-07-20 21:34:42,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:42,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:42,846 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:34:42,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:42,846 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:42,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:43,226 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:43,226 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:43,226 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:43,226 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:43,227 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:43,227 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:43,227 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:43,233 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:34:43,233 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:34:43,589 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-07-20 21:34:43,589 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:43,591 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:43,600 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:43,601 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:44,822 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:44,841 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:44,841 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:44,855 INFO L103 rtionOrderModulation]: Keeping assertion order MIX_INSIDE_OUTSIDE [2018-07-20 21:34:44,856 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder MIX_INSIDE_OUTSIDE (IT: FPandBP) [2018-07-20 21:34:45,191 INFO L242 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2018-07-20 21:34:45,191 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:45,196 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:45,211 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:45,212 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:45,223 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:45,224 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:45,225 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21, 21, 21] total 40 [2018-07-20 21:34:45,225 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:45,225 INFO L450 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-07-20 21:34:45,225 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-07-20 21:34:45,226 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-07-20 21:34:45,226 INFO L87 Difference]: Start difference. First operand 48 states and 48 transitions. Second operand 21 states. [2018-07-20 21:34:45,527 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:45,527 INFO L93 Difference]: Finished difference Result 55 states and 55 transitions. [2018-07-20 21:34:45,527 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2018-07-20 21:34:45,527 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2018-07-20 21:34:45,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:45,528 INFO L225 Difference]: With dead ends: 55 [2018-07-20 21:34:45,528 INFO L226 Difference]: Without dead ends: 50 [2018-07-20 21:34:45,528 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 167 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-07-20 21:34:45,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2018-07-20 21:34:45,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2018-07-20 21:34:45,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2018-07-20 21:34:45,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 50 transitions. [2018-07-20 21:34:45,533 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 50 transitions. Word has length 47 [2018-07-20 21:34:45,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:45,533 INFO L471 AbstractCegarLoop]: Abstraction has 50 states and 50 transitions. [2018-07-20 21:34:45,533 INFO L472 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-07-20 21:34:45,534 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 50 transitions. [2018-07-20 21:34:45,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2018-07-20 21:34:45,534 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:45,534 INFO L358 BasicCegarLoop]: trace histogram [20, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:45,535 INFO L414 AbstractCegarLoop]: === Iteration 21 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:45,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1591136418, now seen corresponding path program 19 times [2018-07-20 21:34:45,535 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:45,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:45,536 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:34:45,536 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:45,536 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:45,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:46,038 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:46,038 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:46,039 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:46,039 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:46,039 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:46,039 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:46,039 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:46,045 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:34:46,045 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:34:46,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:46,070 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:46,084 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:46,084 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:47,319 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:47,339 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:47,339 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:47,354 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:34:47,354 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-07-20 21:34:47,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:47,390 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:47,432 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:47,432 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:47,439 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 380 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:47,440 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:47,440 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22, 22, 22] total 42 [2018-07-20 21:34:47,440 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:47,441 INFO L450 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-07-20 21:34:47,441 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-07-20 21:34:47,442 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-07-20 21:34:47,442 INFO L87 Difference]: Start difference. First operand 50 states and 50 transitions. Second operand 22 states. [2018-07-20 21:34:47,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:47,611 INFO L93 Difference]: Finished difference Result 57 states and 57 transitions. [2018-07-20 21:34:47,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-07-20 21:34:47,612 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2018-07-20 21:34:47,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:47,612 INFO L225 Difference]: With dead ends: 57 [2018-07-20 21:34:47,612 INFO L226 Difference]: Without dead ends: 52 [2018-07-20 21:34:47,613 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 174 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=481, Invalid=1241, Unknown=0, NotChecked=0, Total=1722 [2018-07-20 21:34:47,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2018-07-20 21:34:47,616 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2018-07-20 21:34:47,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2018-07-20 21:34:47,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 52 transitions. [2018-07-20 21:34:47,617 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 52 transitions. Word has length 49 [2018-07-20 21:34:47,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:47,618 INFO L471 AbstractCegarLoop]: Abstraction has 52 states and 52 transitions. [2018-07-20 21:34:47,618 INFO L472 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-07-20 21:34:47,618 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 52 transitions. [2018-07-20 21:34:47,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-07-20 21:34:47,618 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:47,619 INFO L358 BasicCegarLoop]: trace histogram [21, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:47,619 INFO L414 AbstractCegarLoop]: === Iteration 22 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:47,619 INFO L82 PathProgramCache]: Analyzing trace with hash 1411917576, now seen corresponding path program 20 times [2018-07-20 21:34:47,619 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:47,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:47,620 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-07-20 21:34:47,620 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:47,620 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:47,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:48,955 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:48,955 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:48,956 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:48,956 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:48,956 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:48,956 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:48,956 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:48,961 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:34:48,962 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:34:48,974 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:34:48,975 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:48,977 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:48,988 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:48,988 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:50,441 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:50,460 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:50,460 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:50,474 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST1 [2018-07-20 21:34:50,474 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST1 (IT: FPandBP) [2018-07-20 21:34:50,506 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2018-07-20 21:34:50,506 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:50,510 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:50,528 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:50,528 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:50,588 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:50,592 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:50,593 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23, 23, 23] total 44 [2018-07-20 21:34:50,593 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:50,593 INFO L450 AbstractCegarLoop]: Interpolant automaton has 23 states [2018-07-20 21:34:50,593 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2018-07-20 21:34:50,594 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-07-20 21:34:50,594 INFO L87 Difference]: Start difference. First operand 52 states and 52 transitions. Second operand 23 states. [2018-07-20 21:34:50,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:50,784 INFO L93 Difference]: Finished difference Result 59 states and 59 transitions. [2018-07-20 21:34:50,786 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2018-07-20 21:34:50,786 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2018-07-20 21:34:50,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:50,786 INFO L225 Difference]: With dead ends: 59 [2018-07-20 21:34:50,786 INFO L226 Difference]: Without dead ends: 54 [2018-07-20 21:34:50,787 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 181 SyntacticMatches, 3 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=526, Invalid=1366, Unknown=0, NotChecked=0, Total=1892 [2018-07-20 21:34:50,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-07-20 21:34:50,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2018-07-20 21:34:50,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-07-20 21:34:50,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 54 transitions. [2018-07-20 21:34:50,792 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 54 transitions. Word has length 51 [2018-07-20 21:34:50,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:50,792 INFO L471 AbstractCegarLoop]: Abstraction has 54 states and 54 transitions. [2018-07-20 21:34:50,792 INFO L472 AbstractCegarLoop]: Interpolant automaton has 23 states. [2018-07-20 21:34:50,793 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 54 transitions. [2018-07-20 21:34:50,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-07-20 21:34:50,793 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:50,793 INFO L358 BasicCegarLoop]: trace histogram [22, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:50,793 INFO L414 AbstractCegarLoop]: === Iteration 23 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:50,794 INFO L82 PathProgramCache]: Analyzing trace with hash 981302254, now seen corresponding path program 21 times [2018-07-20 21:34:50,794 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:50,794 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:50,795 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:34:50,796 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:50,796 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:50,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:51,409 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:51,409 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:51,409 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:51,409 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:51,409 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:51,409 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:51,409 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:51,416 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:34:51,416 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:34:51,539 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-07-20 21:34:51,540 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:51,541 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:51,567 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:51,567 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:52,591 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:52,610 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:52,611 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:52,625 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-07-20 21:34:52,625 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-07-20 21:34:53,012 INFO L242 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2018-07-20 21:34:53,012 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:53,016 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:53,025 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:53,025 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:53,040 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 462 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:53,041 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:53,041 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24, 24, 24] total 46 [2018-07-20 21:34:53,041 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:53,041 INFO L450 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-07-20 21:34:53,042 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-07-20 21:34:53,042 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-07-20 21:34:53,042 INFO L87 Difference]: Start difference. First operand 54 states and 54 transitions. Second operand 24 states. [2018-07-20 21:34:53,246 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:53,246 INFO L93 Difference]: Finished difference Result 61 states and 61 transitions. [2018-07-20 21:34:53,246 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2018-07-20 21:34:53,246 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2018-07-20 21:34:53,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:53,246 INFO L225 Difference]: With dead ends: 61 [2018-07-20 21:34:53,247 INFO L226 Difference]: Without dead ends: 56 [2018-07-20 21:34:53,247 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 188 SyntacticMatches, 3 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=573, Invalid=1497, Unknown=0, NotChecked=0, Total=2070 [2018-07-20 21:34:53,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2018-07-20 21:34:53,252 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2018-07-20 21:34:53,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-07-20 21:34:53,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 56 transitions. [2018-07-20 21:34:53,253 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 56 transitions. Word has length 53 [2018-07-20 21:34:53,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:53,253 INFO L471 AbstractCegarLoop]: Abstraction has 56 states and 56 transitions. [2018-07-20 21:34:53,253 INFO L472 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-07-20 21:34:53,253 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 56 transitions. [2018-07-20 21:34:53,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-07-20 21:34:53,254 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:53,254 INFO L358 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:53,254 INFO L414 AbstractCegarLoop]: === Iteration 24 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:53,254 INFO L82 PathProgramCache]: Analyzing trace with hash -523161772, now seen corresponding path program 22 times [2018-07-20 21:34:53,255 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:53,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:53,255 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:34:53,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:53,256 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:53,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:53,617 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:53,617 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:53,617 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:53,617 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:53,617 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:53,617 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:53,617 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:53,623 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:34:53,623 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:34:53,636 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:34:53,636 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:53,638 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:53,664 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:53,665 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:54,783 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:54,803 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:54,803 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode CVC4_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/cvc4nyu Starting monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with cvc4nyu --tear-down-incremental --print-success --lang smt --rewrite-divk --tlimit-per=12000 [2018-07-20 21:34:54,821 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-07-20 21:34:54,821 INFO L282 anRefinementStrategy]: Using traceCheck mode CVC4_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-07-20 21:34:54,861 INFO L242 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-07-20 21:34:54,861 INFO L243 tOrderPrioritization]: Conjunction of SSA is unsat [2018-07-20 21:34:54,865 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-07-20 21:34:54,875 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:54,875 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-07-20 21:34:54,883 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:54,884 INFO L309 seRefinementStrategy]: Constructing automaton from 0 perfect and 5 imperfect interpolant sequences. [2018-07-20 21:34:54,884 INFO L324 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25, 25, 25] total 48 [2018-07-20 21:34:54,884 INFO L249 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-07-20 21:34:54,885 INFO L450 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-07-20 21:34:54,885 INFO L132 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-07-20 21:34:54,886 INFO L133 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-07-20 21:34:54,886 INFO L87 Difference]: Start difference. First operand 56 states and 56 transitions. Second operand 25 states. [2018-07-20 21:34:55,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-07-20 21:34:55,105 INFO L93 Difference]: Finished difference Result 63 states and 63 transitions. [2018-07-20 21:34:55,105 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-07-20 21:34:55,106 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2018-07-20 21:34:55,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-07-20 21:34:55,106 INFO L225 Difference]: With dead ends: 63 [2018-07-20 21:34:55,106 INFO L226 Difference]: Without dead ends: 58 [2018-07-20 21:34:55,107 INFO L578 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 195 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-07-20 21:34:55,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-07-20 21:34:55,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2018-07-20 21:34:55,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2018-07-20 21:34:55,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 58 transitions. [2018-07-20 21:34:55,111 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 58 transitions. Word has length 55 [2018-07-20 21:34:55,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-07-20 21:34:55,111 INFO L471 AbstractCegarLoop]: Abstraction has 58 states and 58 transitions. [2018-07-20 21:34:55,111 INFO L472 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-07-20 21:34:55,111 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 58 transitions. [2018-07-20 21:34:55,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2018-07-20 21:34:55,111 INFO L350 BasicCegarLoop]: Found error trace [2018-07-20 21:34:55,111 INFO L358 BasicCegarLoop]: trace histogram [24, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-07-20 21:34:55,111 INFO L414 AbstractCegarLoop]: === Iteration 25 === [__U_MULTI_f_storage_ultimate_trunk_examples_svcomp_loop_acceleration_simple_false_unreach_call__i____VERIFIER_assertErr0AssertViolationERROR_FUNCTION]=== [2018-07-20 21:34:55,112 INFO L82 PathProgramCache]: Analyzing trace with hash 1090887994, now seen corresponding path program 23 times [2018-07-20 21:34:55,112 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-07-20 21:34:55,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:55,112 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-07-20 21:34:55,112 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-07-20 21:34:55,112 INFO L282 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-07-20 21:34:55,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-07-20 21:34:55,569 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 552 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-07-20 21:34:55,569 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:55,569 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-07-20 21:34:55,569 INFO L183 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-07-20 21:34:55,569 INFO L419 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-07-20 21:34:55,569 INFO L297 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-07-20 21:34:55,569 INFO L189 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-07-20 21:34:55,575 INFO L103 rtionOrderModulation]: Keeping assertion order INSIDE_LOOP_FIRST1 [2018-07-20 21:34:55,575 INFO L282 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder INSIDE_LOOP_FIRST1 (IT: FPandBP) Received shutdown request... Cannot interrupt operation gracefully because timeout expired. Forcing shutdown