java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:49:14,505 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:49:14,507 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:49:14,519 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:49:14,519 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:49:14,520 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:49:14,521 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:49:14,526 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:49:14,528 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:49:14,528 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:49:14,529 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:49:14,530 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:49:14,531 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:49:14,532 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:49:14,534 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:49:14,535 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:49:14,535 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:49:14,537 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:49:14,539 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:49:14,541 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:49:14,542 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:49:14,543 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:49:14,545 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:49:14,546 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:49:14,546 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:49:14,547 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:49:14,548 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:49:14,549 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:49:14,550 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:49:14,551 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:49:14,551 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:49:14,552 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 16:49:14,552 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:49:14,552 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:49:14,553 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:49:14,554 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:49:14,554 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-11-07 16:49:14,580 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:49:14,580 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:49:14,581 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:49:14,581 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:49:14,581 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:49:14,582 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:49:14,582 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:49:14,582 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:49:14,582 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:49:14,582 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:49:14,583 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:49:14,583 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:49:14,584 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:49:14,584 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:49:14,584 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:49:14,585 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:49:14,585 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:49:14,585 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:49:14,585 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:49:14,585 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:49:14,587 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:49:14,587 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:49:14,587 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:49:14,587 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:49:14,587 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:49:14,588 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:49:14,588 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:49:14,588 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:49:14,588 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:49:14,588 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:49:14,589 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:49:14,589 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:49:14,589 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:49:14,589 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:49:14,644 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:49:14,659 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:49:14,662 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:49:14,664 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:49:14,664 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:49:14,665 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c [2018-11-07 16:49:14,726 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174ddc143/d259f47f4f6a467cb245faaef9e91cb0/FLAG98a406e70 [2018-11-07 16:49:15,172 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:49:15,173 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c [2018-11-07 16:49:15,179 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174ddc143/d259f47f4f6a467cb245faaef9e91cb0/FLAG98a406e70 [2018-11-07 16:49:15,198 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/174ddc143/d259f47f4f6a467cb245faaef9e91cb0 [2018-11-07 16:49:15,209 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:49:15,211 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:49:15,212 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:49:15,212 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:49:15,217 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:49:15,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,220 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6ede70b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15, skipping insertion in model container [2018-11-07 16:49:15,220 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,230 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:49:15,247 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:49:15,422 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:49:15,426 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:49:15,441 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:49:15,457 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:49:15,458 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15 WrapperNode [2018-11-07 16:49:15,458 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:49:15,459 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:49:15,459 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:49:15,459 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:49:15,469 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,475 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,481 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:49:15,482 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:49:15,482 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:49:15,482 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:49:15,492 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,493 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,494 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,497 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,505 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,506 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... [2018-11-07 16:49:15,507 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:49:15,508 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:49:15,508 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:49:15,508 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:49:15,509 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:49:15,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:49:15,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:49:15,636 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:49:15,636 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:49:15,636 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:49:15,637 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:49:15,637 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:49:15,637 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:49:15,838 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:49:15,838 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:49:15 BoogieIcfgContainer [2018-11-07 16:49:15,838 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:49:15,839 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:49:15,840 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:49:15,855 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:49:15,855 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:49:15" (1/3) ... [2018-11-07 16:49:15,856 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf2a504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:49:15, skipping insertion in model container [2018-11-07 16:49:15,856 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:49:15" (2/3) ... [2018-11-07 16:49:15,856 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@cf2a504 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:49:15, skipping insertion in model container [2018-11-07 16:49:15,857 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:49:15" (3/3) ... [2018-11-07 16:49:15,863 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono3_false-unreach-call1.c [2018-11-07 16:49:15,884 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:49:15,899 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:49:15,923 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:49:15,966 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:49:15,966 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:49:15,966 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:49:15,966 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:49:15,967 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:49:15,967 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:49:15,967 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:49:15,967 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:49:16,001 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-07 16:49:16,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 16:49:16,008 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:16,012 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:16,014 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:16,020 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:16,020 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2018-11-07 16:49:16,022 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:16,072 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,073 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:16,073 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,073 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:16,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:16,131 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:16,132 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:49:16,133 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:49:16,133 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:49:16,137 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:49:16,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:49:16,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:49:16,152 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-11-07 16:49:16,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:16,176 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 16:49:16,177 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:49:16,178 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 16:49:16,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:16,189 INFO L225 Difference]: With dead ends: 31 [2018-11-07 16:49:16,189 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 16:49:16,198 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:49:16,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 16:49:16,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 16:49:16,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 16:49:16,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-07 16:49:16,234 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-07 16:49:16,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:16,234 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-07 16:49:16,235 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:49:16,235 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-07 16:49:16,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 16:49:16,236 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:16,236 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:16,236 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:16,237 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:16,237 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-11-07 16:49:16,237 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:16,238 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,239 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:16,239 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,239 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:16,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:16,406 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:16,408 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:49:16,409 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 16:49:16,409 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:49:16,410 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 16:49:16,411 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 16:49:16,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:49:16,411 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2018-11-07 16:49:16,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:16,568 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 16:49:16,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:49:16,569 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 16:49:16,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:16,570 INFO L225 Difference]: With dead ends: 27 [2018-11-07 16:49:16,570 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 16:49:16,572 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 16:49:16,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 16:49:16,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-11-07 16:49:16,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 16:49:16,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-07 16:49:16,581 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-07 16:49:16,582 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:16,582 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-07 16:49:16,582 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 16:49:16,582 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-07 16:49:16,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 16:49:16,583 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:16,583 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:16,584 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:16,584 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:16,584 INFO L82 PathProgramCache]: Analyzing trace with hash 514987241, now seen corresponding path program 1 times [2018-11-07 16:49:16,584 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:16,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,586 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:16,587 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:16,587 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:16,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:16,693 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:16,694 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:16,696 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:16,697 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 16:49:16,699 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [21], [27], [30], [32], [38], [39], [40], [42] [2018-11-07 16:49:16,731 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:49:16,731 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:49:16,825 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:49:16,973 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:49:16,974 INFO L272 AbstractInterpreter]: Visited 14 different actions 78 times. Merged at 5 different actions 38 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-11-07 16:49:16,991 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:16,992 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:49:16,993 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:16,993 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:17,018 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:17,018 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:17,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:17,044 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:17,175 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:17,175 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:17,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:17,670 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:17,670 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 8] total 13 [2018-11-07 16:49:17,670 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:17,671 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:49:17,671 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:49:17,672 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:49:17,672 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 7 states. [2018-11-07 16:49:17,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:17,770 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 16:49:17,775 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:49:17,775 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 16:49:17,775 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:17,776 INFO L225 Difference]: With dead ends: 31 [2018-11-07 16:49:17,776 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 16:49:17,777 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:49:17,777 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 16:49:17,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 16:49:17,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 16:49:17,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 16:49:17,782 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-11-07 16:49:17,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:17,783 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 16:49:17,783 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:49:17,783 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 16:49:17,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 16:49:17,784 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:17,784 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:17,785 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:17,785 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:17,785 INFO L82 PathProgramCache]: Analyzing trace with hash 1005624851, now seen corresponding path program 2 times [2018-11-07 16:49:17,785 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:17,786 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:17,787 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:17,787 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:17,787 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:17,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:17,897 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:17,897 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:17,898 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:17,898 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:17,898 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:17,898 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:17,899 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:17,920 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:49:17,920 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:49:17,962 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 16:49:17,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:17,964 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:18,076 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:18,077 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:18,186 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:18,212 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 16:49:18,213 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2018-11-07 16:49:18,213 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:49:18,213 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 16:49:18,214 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 16:49:18,214 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:49:18,214 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2018-11-07 16:49:18,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:18,357 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-11-07 16:49:18,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:49:18,358 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-11-07 16:49:18,358 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:18,359 INFO L225 Difference]: With dead ends: 32 [2018-11-07 16:49:18,359 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 16:49:18,360 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:49:18,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 16:49:18,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2018-11-07 16:49:18,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 16:49:18,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-07 16:49:18,365 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2018-11-07 16:49:18,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:18,366 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-07 16:49:18,366 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 16:49:18,366 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-07 16:49:18,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 16:49:18,367 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:18,367 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:18,367 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:18,367 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:18,367 INFO L82 PathProgramCache]: Analyzing trace with hash -422257669, now seen corresponding path program 1 times [2018-11-07 16:49:18,368 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:18,368 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:18,369 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:18,369 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:18,369 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:18,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:18,544 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:18,545 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:18,545 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:18,545 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-11-07 16:49:18,545 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [21], [27], [30], [32], [38], [39], [40], [42] [2018-11-07 16:49:18,547 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:49:18,547 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:49:18,552 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:49:18,652 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:49:18,652 INFO L272 AbstractInterpreter]: Visited 15 different actions 90 times. Merged at 6 different actions 41 times. Widened at 1 different actions 4 times. Found 8 fixpoints after 2 different actions. Largest state had 5 variables. [2018-11-07 16:49:18,678 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:18,679 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:49:18,679 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:18,679 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:18,688 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:18,688 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:18,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:18,709 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:18,880 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:18,881 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:19,168 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:19,188 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:19,188 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-11-07 16:49:19,188 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:19,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:49:19,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:49:19,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:49:19,189 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 6 states. [2018-11-07 16:49:19,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:19,288 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2018-11-07 16:49:19,288 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:49:19,288 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-11-07 16:49:19,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:19,289 INFO L225 Difference]: With dead ends: 41 [2018-11-07 16:49:19,289 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 16:49:19,290 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 41 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 16:49:19,290 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 16:49:19,294 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2018-11-07 16:49:19,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-07 16:49:19,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-11-07 16:49:19,295 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2018-11-07 16:49:19,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:19,296 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-11-07 16:49:19,296 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:49:19,296 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-11-07 16:49:19,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 16:49:19,297 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:19,297 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:19,297 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:19,297 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:19,298 INFO L82 PathProgramCache]: Analyzing trace with hash -659252443, now seen corresponding path program 2 times [2018-11-07 16:49:19,298 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:19,298 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:19,299 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:19,299 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:19,299 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:19,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:19,535 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:19,535 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:19,535 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:19,536 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:19,536 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:19,536 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:19,536 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:19,546 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:49:19,546 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:49:19,556 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:49:19,557 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:19,560 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:19,696 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:19,697 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:19,753 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 19 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:19,773 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:19,773 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2018-11-07 16:49:19,773 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:19,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 16:49:19,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 16:49:19,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-11-07 16:49:19,775 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 10 states. [2018-11-07 16:49:20,059 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 16:49:20,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:20,438 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2018-11-07 16:49:20,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 16:49:20,440 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2018-11-07 16:49:20,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:20,441 INFO L225 Difference]: With dead ends: 63 [2018-11-07 16:49:20,441 INFO L226 Difference]: Without dead ends: 51 [2018-11-07 16:49:20,442 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=93, Invalid=147, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:49:20,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-07 16:49:20,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-11-07 16:49:20,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 16:49:20,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-11-07 16:49:20,452 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 27 [2018-11-07 16:49:20,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:20,452 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-11-07 16:49:20,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 16:49:20,453 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-11-07 16:49:20,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 16:49:20,454 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:20,454 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:20,454 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:20,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:20,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1470926709, now seen corresponding path program 3 times [2018-11-07 16:49:20,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:20,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:20,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:20,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:20,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:20,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:20,715 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:20,715 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:20,716 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:20,716 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:20,716 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:20,716 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:20,716 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:20,730 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:49:20,731 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:49:20,771 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:49:20,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:20,775 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:20,838 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:20,838 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:21,412 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:21,433 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:21,433 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 20 [2018-11-07 16:49:21,433 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:21,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 16:49:21,434 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 16:49:21,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:49:21,435 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2018-11-07 16:49:21,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:21,753 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2018-11-07 16:49:21,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 16:49:21,754 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2018-11-07 16:49:21,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:21,756 INFO L225 Difference]: With dead ends: 73 [2018-11-07 16:49:21,756 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 16:49:21,757 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 16:49:21,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 16:49:21,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-11-07 16:49:21,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-07 16:49:21,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-11-07 16:49:21,765 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 43 [2018-11-07 16:49:21,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:21,766 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-11-07 16:49:21,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 16:49:21,766 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-11-07 16:49:21,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-07 16:49:21,767 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:21,768 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:21,768 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:21,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:21,768 INFO L82 PathProgramCache]: Analyzing trace with hash -1020521463, now seen corresponding path program 4 times [2018-11-07 16:49:21,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:21,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:21,770 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:21,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:21,770 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:21,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:22,338 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 0 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:22,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:22,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:22,339 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:22,339 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:22,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:22,340 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:22,349 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:22,349 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:22,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:22,371 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:22,426 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 68 proven. 171 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:22,427 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:22,971 INFO L134 CoverageAnalysis]: Checked inductivity of 242 backedges. 68 proven. 171 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:22,992 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:22,992 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 13] total 25 [2018-11-07 16:49:22,993 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:22,993 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 16:49:22,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 16:49:22,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:49:22,994 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2018-11-07 16:49:23,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:23,571 INFO L93 Difference]: Finished difference Result 85 states and 92 transitions. [2018-11-07 16:49:23,572 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 16:49:23,572 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2018-11-07 16:49:23,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:23,574 INFO L225 Difference]: With dead ends: 85 [2018-11-07 16:49:23,574 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 16:49:23,575 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:49:23,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 16:49:23,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-11-07 16:49:23,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-11-07 16:49:23,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-11-07 16:49:23,584 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 55 [2018-11-07 16:49:23,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:23,584 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-11-07 16:49:23,584 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 16:49:23,585 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-11-07 16:49:23,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-07 16:49:23,586 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:23,586 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:23,586 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:23,587 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:23,587 INFO L82 PathProgramCache]: Analyzing trace with hash 732260999, now seen corresponding path program 5 times [2018-11-07 16:49:23,587 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:23,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:23,588 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:23,588 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:23,588 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:23,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:24,015 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:24,015 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:24,015 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:24,015 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:24,016 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:24,016 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:24,016 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:24,024 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:49:24,024 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:49:24,050 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 16:49:24,050 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:24,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:24,227 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 129 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-11-07 16:49:24,227 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:24,387 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 129 proven. 10 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2018-11-07 16:49:24,407 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:24,408 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 6, 6] total 25 [2018-11-07 16:49:24,408 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:24,408 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 16:49:24,410 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 16:49:24,411 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=423, Unknown=0, NotChecked=0, Total=600 [2018-11-07 16:49:24,411 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 21 states. [2018-11-07 16:49:26,290 WARN L179 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 16:49:26,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:26,291 INFO L93 Difference]: Finished difference Result 115 states and 128 transitions. [2018-11-07 16:49:26,291 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:49:26,291 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 67 [2018-11-07 16:49:26,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:26,294 INFO L225 Difference]: With dead ends: 115 [2018-11-07 16:49:26,294 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 16:49:26,295 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=314, Invalid=616, Unknown=0, NotChecked=0, Total=930 [2018-11-07 16:49:26,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 16:49:26,303 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 88. [2018-11-07 16:49:26,304 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-07 16:49:26,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2018-11-07 16:49:26,305 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 67 [2018-11-07 16:49:26,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:26,305 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2018-11-07 16:49:26,305 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 16:49:26,306 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2018-11-07 16:49:26,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 16:49:26,307 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:26,307 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:26,307 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:26,308 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:26,308 INFO L82 PathProgramCache]: Analyzing trace with hash -742753001, now seen corresponding path program 6 times [2018-11-07 16:49:26,308 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:26,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:26,309 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:26,309 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:26,309 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:26,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:26,891 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 722 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:26,892 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:26,892 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:26,892 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:26,892 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:26,893 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:26,893 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:26,903 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:49:26,903 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:49:26,952 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:49:26,952 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:26,956 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:27,460 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 184 proven. 528 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:27,460 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:28,754 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 184 proven. 528 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:28,774 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:28,774 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 20] total 40 [2018-11-07 16:49:28,774 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:28,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 16:49:28,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 16:49:28,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:49:28,776 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 22 states. [2018-11-07 16:49:30,357 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:30,357 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2018-11-07 16:49:30,358 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 16:49:30,358 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 87 [2018-11-07 16:49:30,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:30,359 INFO L225 Difference]: With dead ends: 125 [2018-11-07 16:49:30,360 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 16:49:30,361 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 155 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:49:30,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 16:49:30,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-11-07 16:49:30,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-11-07 16:49:30,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 107 transitions. [2018-11-07 16:49:30,371 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 107 transitions. Word has length 87 [2018-11-07 16:49:30,371 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:30,372 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 107 transitions. [2018-11-07 16:49:30,372 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 16:49:30,372 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 107 transitions. [2018-11-07 16:49:30,373 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-07 16:49:30,373 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:30,373 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 20, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:30,374 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:30,374 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:30,374 INFO L82 PathProgramCache]: Analyzing trace with hash 1462524863, now seen corresponding path program 7 times [2018-11-07 16:49:30,374 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:30,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:30,375 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:30,375 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:30,375 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:30,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:31,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1058 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:31,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:31,121 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:31,121 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:31,121 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:31,121 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:31,122 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:31,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:31,130 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:31,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:31,163 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:31,241 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 228 proven. 820 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:31,241 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:33,433 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 228 proven. 820 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:49:33,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:33,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23, 24] total 48 [2018-11-07 16:49:33,453 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:33,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 16:49:33,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 16:49:33,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:49:33,455 INFO L87 Difference]: Start difference. First operand 104 states and 107 transitions. Second operand 26 states. [2018-11-07 16:49:34,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:34,899 INFO L93 Difference]: Finished difference Result 141 states and 151 transitions. [2018-11-07 16:49:34,900 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 16:49:34,900 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2018-11-07 16:49:34,901 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:34,902 INFO L225 Difference]: With dead ends: 141 [2018-11-07 16:49:34,903 INFO L226 Difference]: Without dead ends: 121 [2018-11-07 16:49:34,904 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 16:49:34,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-11-07 16:49:34,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-11-07 16:49:34,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 16:49:34,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2018-11-07 16:49:34,915 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 103 [2018-11-07 16:49:34,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:34,916 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2018-11-07 16:49:34,916 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 16:49:34,916 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2018-11-07 16:49:34,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 16:49:34,918 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:34,918 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 24, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:34,918 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:34,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:34,919 INFO L82 PathProgramCache]: Analyzing trace with hash 379316839, now seen corresponding path program 8 times [2018-11-07 16:49:34,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:34,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:34,920 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:34,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:34,920 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:34,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:35,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 0 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:35,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:35,542 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:35,542 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:35,542 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:35,542 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:35,542 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:35,553 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:49:35,553 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:49:35,602 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 16:49:35,602 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:35,606 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:35,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 21 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2018-11-07 16:49:35,829 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:36,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 21 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2018-11-07 16:49:36,116 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:36,116 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 7, 7] total 40 [2018-11-07 16:49:36,117 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:36,117 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 16:49:36,118 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 16:49:36,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=1188, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 16:49:36,118 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 35 states. [2018-11-07 16:49:37,998 WARN L179 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 10 [2018-11-07 16:49:40,608 WARN L179 SmtUtils]: Spent 2.32 s on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 16:49:47,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:47,612 INFO L93 Difference]: Finished difference Result 179 states and 196 transitions. [2018-11-07 16:49:47,612 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 16:49:47,612 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 119 [2018-11-07 16:49:47,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:47,615 INFO L225 Difference]: With dead ends: 179 [2018-11-07 16:49:47,615 INFO L226 Difference]: Without dead ends: 159 [2018-11-07 16:49:47,616 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=707, Invalid=1644, Unknown=1, NotChecked=0, Total=2352 [2018-11-07 16:49:47,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-11-07 16:49:47,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 144. [2018-11-07 16:49:47,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-11-07 16:49:47,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 148 transitions. [2018-11-07 16:49:47,635 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 148 transitions. Word has length 119 [2018-11-07 16:49:47,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:47,636 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 148 transitions. [2018-11-07 16:49:47,636 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 16:49:47,636 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 148 transitions. [2018-11-07 16:49:47,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-11-07 16:49:47,638 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:47,638 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 29, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:47,639 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:47,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:47,639 INFO L82 PathProgramCache]: Analyzing trace with hash -1811900639, now seen corresponding path program 9 times [2018-11-07 16:49:47,639 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:47,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:47,640 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:47,640 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:47,640 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:47,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:48,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 98 proven. 2080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:48,629 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:48,629 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:48,629 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:48,629 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:48,630 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:48,630 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:48,646 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:49:48,647 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:49:48,702 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:49:48,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:49:48,708 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:48,845 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 222 proven. 1953 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:48,845 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:49:53,154 INFO L134 CoverageAnalysis]: Checked inductivity of 2178 backedges. 222 proven. 1953 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:49:53,174 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:49:53,174 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 34, 35] total 69 [2018-11-07 16:49:53,174 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:49:53,175 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 16:49:53,175 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 16:49:53,177 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=3401, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 16:49:53,177 INFO L87 Difference]: Start difference. First operand 144 states and 148 transitions. Second operand 36 states. [2018-11-07 16:49:55,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:49:55,452 INFO L93 Difference]: Finished difference Result 185 states and 197 transitions. [2018-11-07 16:49:55,452 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 16:49:55,453 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 143 [2018-11-07 16:49:55,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:49:55,455 INFO L225 Difference]: With dead ends: 185 [2018-11-07 16:49:55,455 INFO L226 Difference]: Without dead ends: 161 [2018-11-07 16:49:55,457 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 252 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=1291, Invalid=3401, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 16:49:55,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-11-07 16:49:55,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2018-11-07 16:49:55,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 16:49:55,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 164 transitions. [2018-11-07 16:49:55,470 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 164 transitions. Word has length 143 [2018-11-07 16:49:55,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:49:55,470 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 164 transitions. [2018-11-07 16:49:55,470 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 16:49:55,470 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 164 transitions. [2018-11-07 16:49:55,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 16:49:55,473 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:49:55,473 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 33, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:49:55,473 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:49:55,473 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:49:55,474 INFO L82 PathProgramCache]: Analyzing trace with hash 426139081, now seen corresponding path program 10 times [2018-11-07 16:49:55,474 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:49:55,474 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:55,474 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:49:55,475 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:49:55,475 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:49:55,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:56,503 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 110 proven. 2628 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:49:56,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:56,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:49:56,504 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:49:56,504 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:49:56,504 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:49:56,504 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:49:56,512 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:49:56,512 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:49:56,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:49:56,562 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:49:56,818 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 506 proven. 2211 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:49:56,818 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:05,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2738 backedges. 506 proven. 2207 refuted. 4 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:05,165 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:05,165 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 36, 37] total 75 [2018-11-07 16:50:05,166 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:05,166 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 16:50:05,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 16:50:05,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1515, Invalid=4034, Unknown=1, NotChecked=0, Total=5550 [2018-11-07 16:50:05,168 INFO L87 Difference]: Start difference. First operand 160 states and 164 transitions. Second operand 40 states. [2018-11-07 16:50:08,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:08,262 INFO L93 Difference]: Finished difference Result 201 states and 213 transitions. [2018-11-07 16:50:08,263 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 16:50:08,263 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2018-11-07 16:50:08,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:08,265 INFO L225 Difference]: With dead ends: 201 [2018-11-07 16:50:08,265 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 16:50:08,268 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 282 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 9.3s TimeCoverageRelationStatistics Valid=1515, Invalid=4034, Unknown=1, NotChecked=0, Total=5550 [2018-11-07 16:50:08,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 16:50:08,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 176. [2018-11-07 16:50:08,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-11-07 16:50:08,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 180 transitions. [2018-11-07 16:50:08,281 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 180 transitions. Word has length 159 [2018-11-07 16:50:08,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:08,281 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 180 transitions. [2018-11-07 16:50:08,282 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 16:50:08,282 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 180 transitions. [2018-11-07 16:50:08,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-11-07 16:50:08,284 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:08,285 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 37, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:08,285 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:08,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:08,285 INFO L82 PathProgramCache]: Analyzing trace with hash -2047224719, now seen corresponding path program 11 times [2018-11-07 16:50:08,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:08,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:08,286 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:08,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:08,287 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:08,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:09,659 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 122 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:09,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:09,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:09,660 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:09,660 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:09,660 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:09,660 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:09,669 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:09,669 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:11,934 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 16:50:11,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:11,947 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:15,066 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 36 refuted. 0 times theorem prover too weak. 2628 trivial. 0 not checked. [2018-11-07 16:50:15,066 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:21,278 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 35 refuted. 1 times theorem prover too weak. 2628 trivial. 0 not checked. [2018-11-07 16:50:21,298 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:21,298 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 9, 9] total 58 [2018-11-07 16:50:21,298 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:21,299 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 16:50:21,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 16:50:21,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=2722, Unknown=3, NotChecked=0, Total=3306 [2018-11-07 16:50:21,300 INFO L87 Difference]: Start difference. First operand 176 states and 180 transitions. Second operand 51 states. [2018-11-07 16:50:41,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:41,032 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2018-11-07 16:50:41,033 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 16:50:41,033 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 175 [2018-11-07 16:50:41,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:41,034 INFO L225 Difference]: With dead ends: 227 [2018-11-07 16:50:41,035 INFO L226 Difference]: Without dead ends: 203 [2018-11-07 16:50:41,037 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 335 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 10.5s TimeCoverageRelationStatistics Valid=632, Invalid=2787, Unknown=3, NotChecked=0, Total=3422 [2018-11-07 16:50:41,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-11-07 16:50:41,048 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 201. [2018-11-07 16:50:41,048 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-11-07 16:50:41,049 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2018-11-07 16:50:41,049 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 175 [2018-11-07 16:50:41,049 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:41,050 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2018-11-07 16:50:41,050 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 16:50:41,050 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2018-11-07 16:50:41,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-11-07 16:50:41,052 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:41,052 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 42, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:41,053 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:41,053 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:41,053 INFO L82 PathProgramCache]: Analyzing trace with hash -1093808597, now seen corresponding path program 12 times [2018-11-07 16:50:41,053 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:41,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:41,054 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:41,054 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:41,054 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:41,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:43,417 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 0 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:43,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:43,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:43,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:43,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:43,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:43,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:43,427 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:50:43,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:50:43,484 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:50:43,484 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:43,489 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:43,743 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 812 proven. 3570 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:50:43,744 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:50,968 INFO L134 CoverageAnalysis]: Checked inductivity of 4418 backedges. 812 proven. 3570 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:50:50,988 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:50,988 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 45, 46] total 94 [2018-11-07 16:50:50,988 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:50,989 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 16:50:50,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 16:50:50,991 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2298, Invalid=6444, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 16:50:50,992 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand 50 states. [2018-11-07 16:50:55,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:55,674 INFO L93 Difference]: Finished difference Result 255 states and 265 transitions. [2018-11-07 16:50:55,675 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-07 16:50:55,675 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 199 [2018-11-07 16:50:55,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:55,678 INFO L225 Difference]: With dead ends: 255 [2018-11-07 16:50:55,678 INFO L226 Difference]: Without dead ends: 226 [2018-11-07 16:50:55,681 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 353 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=2298, Invalid=6444, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 16:50:55,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-11-07 16:50:55,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2018-11-07 16:50:55,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-11-07 16:50:55,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2018-11-07 16:50:55,695 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 199 [2018-11-07 16:50:55,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:55,695 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2018-11-07 16:50:55,695 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 16:50:55,695 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2018-11-07 16:50:55,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2018-11-07 16:50:55,698 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:55,698 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 48, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:55,698 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:55,699 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:55,699 INFO L82 PathProgramCache]: Analyzing trace with hash 17397287, now seen corresponding path program 13 times [2018-11-07 16:50:55,699 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:55,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:55,700 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:55,700 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:55,700 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:55,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:57,400 INFO L134 CoverageAnalysis]: Checked inductivity of 5618 backedges. 0 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:57,400 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:57,400 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:57,400 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:57,401 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:57,401 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:57,401 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:57,409 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:57,409 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:57,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:57,474 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:57,646 INFO L134 CoverageAnalysis]: Checked inductivity of 5618 backedges. 926 proven. 4656 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:50:57,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:51:06,890 INFO L134 CoverageAnalysis]: Checked inductivity of 5618 backedges. 926 proven. 4656 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:51:06,910 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:51:06,910 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 51, 52] total 106 [2018-11-07 16:51:06,910 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:51:06,911 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-11-07 16:51:06,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-11-07 16:51:06,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2910, Invalid=8220, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 16:51:06,913 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand 56 states. [2018-11-07 16:51:12,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:51:12,550 INFO L93 Difference]: Finished difference Result 279 states and 289 transitions. [2018-11-07 16:51:12,555 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-11-07 16:51:12,555 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 223 [2018-11-07 16:51:12,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:51:12,557 INFO L225 Difference]: With dead ends: 279 [2018-11-07 16:51:12,557 INFO L226 Difference]: Without dead ends: 250 [2018-11-07 16:51:12,558 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 395 SyntacticMatches, 2 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 10.6s TimeCoverageRelationStatistics Valid=2910, Invalid=8220, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 16:51:12,559 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-11-07 16:51:12,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 249. [2018-11-07 16:51:12,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-11-07 16:51:12,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2018-11-07 16:51:12,574 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 223 [2018-11-07 16:51:12,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:51:12,575 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2018-11-07 16:51:12,575 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-11-07 16:51:12,575 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2018-11-07 16:51:12,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 16:51:12,576 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:51:12,576 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 54, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:51:12,577 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:51:12,577 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:51:12,577 INFO L82 PathProgramCache]: Analyzing trace with hash -1542723037, now seen corresponding path program 14 times [2018-11-07 16:51:12,577 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:51:12,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:51:12,578 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:51:12,578 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:51:12,578 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:51:12,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:51:14,895 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 0 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:51:14,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:51:14,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:51:14,896 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:51:14,896 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:51:14,896 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:51:14,896 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:51:14,906 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:51:14,906 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:51:19,437 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 16:51:19,437 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:51:19,481 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:51:20,008 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1236 proven. 55 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2018-11-07 16:51:20,008 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:51:20,619 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1236 proven. 55 refuted. 0 times theorem prover too weak. 5671 trivial. 0 not checked. [2018-11-07 16:51:20,639 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:51:20,639 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 9, 9] total 76 [2018-11-07 16:51:20,639 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:51:20,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 16:51:20,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 16:51:20,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4683, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 16:51:20,641 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand 69 states. [2018-11-07 16:51:35,140 WARN L179 SmtUtils]: Spent 5.32 s on a formula simplification. DAG size of input: 30 DAG size of output: 10 [2018-11-07 16:51:42,473 WARN L179 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 16:51:47,485 WARN L179 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 16:51:55,855 WARN L179 SmtUtils]: Spent 2.20 s on a formula simplification that was a NOOP. DAG size: 16 [2018-11-07 16:52:05,216 WARN L179 SmtUtils]: Spent 2.56 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 16:52:07,886 WARN L179 SmtUtils]: Spent 342.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 16:52:12,876 WARN L179 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 16:52:14,095 WARN L179 SmtUtils]: Spent 416.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 10 [2018-11-07 16:52:14,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:52:14,096 INFO L93 Difference]: Finished difference Result 333 states and 351 transitions. [2018-11-07 16:52:14,096 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-11-07 16:52:14,097 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 247 [2018-11-07 16:52:14,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:52:14,099 INFO L225 Difference]: With dead ends: 333 [2018-11-07 16:52:14,099 INFO L226 Difference]: Without dead ends: 304 [2018-11-07 16:52:14,100 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 576 GetRequests, 487 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 106 ImplicationChecksByTransitivity, 44.2s TimeCoverageRelationStatistics Valid=2098, Invalid=6085, Unknown=7, NotChecked=0, Total=8190 [2018-11-07 16:52:14,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2018-11-07 16:52:14,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 280. [2018-11-07 16:52:14,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-11-07 16:52:14,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 282 transitions. [2018-11-07 16:52:14,117 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 282 transitions. Word has length 247 [2018-11-07 16:52:14,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:52:14,118 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 282 transitions. [2018-11-07 16:52:14,118 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 16:52:14,118 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 282 transitions. [2018-11-07 16:52:14,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-11-07 16:52:14,120 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:52:14,120 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 61, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:52:14,120 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:52:14,120 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:52:14,120 INFO L82 PathProgramCache]: Analyzing trace with hash 1860249137, now seen corresponding path program 15 times [2018-11-07 16:52:14,121 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:52:14,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:14,121 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:52:14,121 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:14,122 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:52:14,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:16,868 INFO L134 CoverageAnalysis]: Checked inductivity of 8978 backedges. 200 proven. 8778 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:52:16,868 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:16,869 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:52:16,869 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:52:16,869 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:52:16,869 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:16,869 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:52:16,885 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:52:16,885 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:52:16,967 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:52:16,967 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:52:16,974 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:52:17,297 INFO L134 CoverageAnalysis]: Checked inductivity of 8978 backedges. 956 proven. 8001 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:52:17,298 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:52:31,340 INFO L134 CoverageAnalysis]: Checked inductivity of 8978 backedges. 956 proven. 8001 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:52:31,360 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:52:31,360 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 66, 67] total 135 [2018-11-07 16:52:31,360 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:52:31,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 16:52:31,362 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 16:52:31,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4755, Invalid=13335, Unknown=0, NotChecked=0, Total=18090 [2018-11-07 16:52:31,363 INFO L87 Difference]: Start difference. First operand 280 states and 282 transitions. Second operand 70 states. [2018-11-07 16:52:39,840 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:52:39,841 INFO L93 Difference]: Finished difference Result 337 states and 347 transitions. [2018-11-07 16:52:39,841 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 16:52:39,842 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 279 [2018-11-07 16:52:39,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:52:39,844 INFO L225 Difference]: With dead ends: 337 [2018-11-07 16:52:39,844 INFO L226 Difference]: Without dead ends: 305 [2018-11-07 16:52:39,846 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 492 SyntacticMatches, 3 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=4755, Invalid=13335, Unknown=0, NotChecked=0, Total=18090 [2018-11-07 16:52:39,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-11-07 16:52:39,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2018-11-07 16:52:39,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2018-11-07 16:52:39,866 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 306 transitions. [2018-11-07 16:52:39,866 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 306 transitions. Word has length 279 [2018-11-07 16:52:39,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:52:39,866 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 306 transitions. [2018-11-07 16:52:39,866 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 16:52:39,867 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 306 transitions. [2018-11-07 16:52:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-11-07 16:52:39,868 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:52:39,868 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 67, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:52:39,869 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:52:39,869 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:52:39,869 INFO L82 PathProgramCache]: Analyzing trace with hash -1582860755, now seen corresponding path program 16 times [2018-11-07 16:52:39,869 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:52:39,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:39,870 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:52:39,870 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:39,870 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:52:39,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:42,738 INFO L134 CoverageAnalysis]: Checked inductivity of 10658 backedges. 218 proven. 10440 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:52:42,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:42,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:52:42,738 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:52:42,738 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:52:42,738 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:42,738 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:52:42,747 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:52:42,747 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:52:42,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:42,834 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:52:43,087 INFO L134 CoverageAnalysis]: Checked inductivity of 10658 backedges. 1558 proven. 9045 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-07 16:52:43,088 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:01,051 INFO L134 CoverageAnalysis]: Checked inductivity of 10658 backedges. 1558 proven. 9041 refuted. 4 times theorem prover too weak. 55 trivial. 0 not checked. [2018-11-07 16:53:01,071 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:01,071 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 70, 71] total 145 [2018-11-07 16:53:01,071 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:01,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 16:53:01,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 16:53:01,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5467, Invalid=15412, Unknown=1, NotChecked=0, Total=20880 [2018-11-07 16:53:01,073 INFO L87 Difference]: Start difference. First operand 304 states and 306 transitions. Second operand 76 states. [2018-11-07 16:53:11,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:11,128 INFO L93 Difference]: Finished difference Result 361 states and 371 transitions. [2018-11-07 16:53:11,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-07 16:53:11,129 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 303 [2018-11-07 16:53:11,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:11,131 INFO L225 Difference]: With dead ends: 361 [2018-11-07 16:53:11,131 INFO L226 Difference]: Without dead ends: 329 [2018-11-07 16:53:11,133 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 536 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 20.4s TimeCoverageRelationStatistics Valid=5467, Invalid=15412, Unknown=1, NotChecked=0, Total=20880 [2018-11-07 16:53:11,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-11-07 16:53:11,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 328. [2018-11-07 16:53:11,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-11-07 16:53:11,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 330 transitions. [2018-11-07 16:53:11,155 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 330 transitions. Word has length 303 [2018-11-07 16:53:11,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:11,156 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 330 transitions. [2018-11-07 16:53:11,156 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-07 16:53:11,156 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 330 transitions. [2018-11-07 16:53:11,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-11-07 16:53:11,158 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:11,158 INFO L375 BasicCegarLoop]: trace histogram [80, 79, 79, 73, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:11,159 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:11,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:11,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1773965865, now seen corresponding path program 17 times [2018-11-07 16:53:11,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:11,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:11,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:53:11,160 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:11,160 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:11,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:14,432 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 236 proven. 12246 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:53:14,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:14,432 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:14,432 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:14,432 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:14,432 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:14,433 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:53:14,443 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:53:14,444 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:53:14,622 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 16:53:14,622 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:53:14,627 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:15,566 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 1964 proven. 78 refuted. 0 times theorem prover too weak. 10440 trivial. 0 not checked. [2018-11-07 16:53:15,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:16,372 INFO L134 CoverageAnalysis]: Checked inductivity of 12482 backedges. 1964 proven. 78 refuted. 0 times theorem prover too weak. 10440 trivial. 0 not checked. [2018-11-07 16:53:16,393 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:16,393 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 10, 10] total 98 [2018-11-07 16:53:16,393 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:16,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-11-07 16:53:16,394 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-11-07 16:53:16,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=7925, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 16:53:16,394 INFO L87 Difference]: Start difference. First operand 328 states and 330 transitions. Second operand 90 states. [2018-11-07 16:53:36,204 WARN L179 SmtUtils]: Spent 861.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 10 Received shutdown request... [2018-11-07 16:53:38,797 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2018-11-07 16:53:38,797 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 16:53:38,801 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 16:53:38,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:53:38 BoogieIcfgContainer [2018-11-07 16:53:38,802 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 16:53:38,802 INFO L168 Benchmark]: Toolchain (without parser) took 263592.57 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 802.2 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -262.9 MB). Peak memory consumption was 539.3 MB. Max. memory is 7.1 GB. [2018-11-07 16:53:38,804 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:53:38,804 INFO L168 Benchmark]: CACSL2BoogieTranslator took 246.30 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 16:53:38,805 INFO L168 Benchmark]: Boogie Procedure Inliner took 22.41 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:53:38,805 INFO L168 Benchmark]: Boogie Preprocessor took 25.91 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:53:38,806 INFO L168 Benchmark]: RCFGBuilder took 330.74 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. [2018-11-07 16:53:38,807 INFO L168 Benchmark]: TraceAbstraction took 262962.24 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 55.6 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 521.4 MB). Peak memory consumption was 577.0 MB. Max. memory is 7.1 GB. [2018-11-07 16:53:38,812 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 246.30 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 22.41 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 25.91 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 330.74 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 746.6 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.9 MB). Peak memory consumption was 26.4 MB. Max. memory is 7.1 GB. * TraceAbstraction took 262962.24 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 55.6 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 521.4 MB). Peak memory consumption was 577.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 2]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 2). Cancelled while BasicCegarLoop was constructing difference of abstraction (328states) and FLOYD_HOARE automaton (currently 82 states, 90 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 99 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 262.8s OverallTime, 21 OverallIterations, 80 TraceHistogramMax, 148.4s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 846 SDtfs, 2703 SDslu, 33332 SDs, 0 SdLazy, 93807 SolverSat, 601 SolverUnsat, 8 SolverUnknown, 0 SolverNotchecked, 76.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5926 GetRequests, 4796 SyntacticMatches, 31 SemanticMatches, 1098 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 633 ImplicationChecksByTransitivity, 157.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=328occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 75 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.2s SsaConstructionTime, 7.9s SatisfiabilityAnalysisTime, 103.9s InterpolantComputationTime, 5247 NumberOfCodeBlocks, 4483 NumberOfCodeBlocksAsserted, 80 NumberOfCheckSat, 7801 ConstructedInterpolants, 0 QuantifiedInterpolants, 10710123 SizeOfPredicates, 26 NumberOfNonLiveVariables, 3345 ConjunctsInSsa, 807 ConjunctsInUnsatCore, 59 InterpolantComputations, 4 PerfectInterpolantSequences, 61350/184362 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown