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-LIM.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:17:02,825 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:17:02,827 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:17:02,842 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:17:02,843 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:17:02,844 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:17:02,845 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:17:02,847 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:17:02,849 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:17:02,850 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:17:02,851 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:17:02,851 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:17:02,852 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:17:02,853 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:17:02,854 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:17:02,855 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:17:02,856 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:17:02,858 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:17:02,860 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:17:02,862 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:17:02,863 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:17:02,864 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:17:02,866 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:17:02,867 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:17:02,867 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:17:02,868 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:17:02,869 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:17:02,870 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:17:02,870 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:17:02,871 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:17:02,872 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:17:02,872 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:17:02,875 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-LIM.epf [2018-11-07 22:17:02,896 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:17:02,896 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:17:02,897 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:17:02,897 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:17:02,901 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:17:02,901 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:17:02,901 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:17:02,901 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:17:02,902 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:17:02,902 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:17:02,902 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:17:02,903 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:17:02,903 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:17:02,904 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:17:02,904 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:17:02,904 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:17:02,904 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:17:02,904 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:17:02,906 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:17:02,906 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:17:02,907 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:17:02,907 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:17:02,907 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:17:02,907 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:17:02,907 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:17:02,908 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:17:02,908 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:17:02,908 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:17:02,909 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:17:02,909 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:17:02,909 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:17:02,909 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:17:02,909 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:17:02,910 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:17:02,910 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:17:02,984 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:17:03,000 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:17:03,005 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:17:03,007 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:17:03,008 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:17:03,008 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c [2018-11-07 22:17:03,077 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a82d72f0b/ec8afb707370453e8e96f5452ea20103/FLAG96e30f779 [2018-11-07 22:17:03,573 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:17:03,574 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono3_false-unreach-call1.c [2018-11-07 22:17:03,580 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a82d72f0b/ec8afb707370453e8e96f5452ea20103/FLAG96e30f779 [2018-11-07 22:17:03,596 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/a82d72f0b/ec8afb707370453e8e96f5452ea20103 [2018-11-07 22:17:03,609 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:17:03,611 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:17:03,612 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:17:03,612 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:17:03,616 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:17:03,617 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,620 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6fd598d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03, skipping insertion in model container [2018-11-07 22:17:03,620 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,631 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:17:03,653 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:17:03,875 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:17:03,879 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:17:03,898 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:17:03,914 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:17:03,915 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03 WrapperNode [2018-11-07 22:17:03,915 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:17:03,916 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:17:03,916 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:17:03,916 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:17:03,927 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,934 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,941 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:17:03,942 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:17:03,942 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:17:03,942 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:17:03,953 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,954 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,954 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,955 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,958 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,967 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,968 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (1/1) ... [2018-11-07 22:17:03,971 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:17:03,972 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:17:03,972 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:17:03,972 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:17:03,973 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (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 22:17:04,135 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:17:04,136 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:17:04,136 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:17:04,136 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:17:04,136 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:17:04,136 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:17:04,137 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:17:04,137 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:17:04,393 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:17:04,394 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:17:04 BoogieIcfgContainer [2018-11-07 22:17:04,394 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:17:04,395 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:17:04,395 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:17:04,399 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:17:04,399 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:17:03" (1/3) ... [2018-11-07 22:17:04,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43baf1b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:17:04, skipping insertion in model container [2018-11-07 22:17:04,400 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:17:03" (2/3) ... [2018-11-07 22:17:04,400 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43baf1b6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:17:04, skipping insertion in model container [2018-11-07 22:17:04,401 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:17:04" (3/3) ... [2018-11-07 22:17:04,402 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono3_false-unreach-call1.c [2018-11-07 22:17:04,414 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:17:04,422 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:17:04,445 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:17:04,495 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:17:04,496 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:17:04,496 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:17:04,496 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:17:04,497 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:17:04,497 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:17:04,497 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:17:04,497 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:17:04,523 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2018-11-07 22:17:04,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:17:04,531 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:04,532 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:04,534 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:04,543 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:04,543 INFO L82 PathProgramCache]: Analyzing trace with hash -146959038, now seen corresponding path program 1 times [2018-11-07 22:17:04,547 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:04,610 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,611 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:04,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,611 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:04,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:04,704 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 22:17:04,708 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:17:04,709 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:17:04,709 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:04,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:17:04,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:17:04,732 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:17:04,737 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 2 states. [2018-11-07 22:17:04,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:04,766 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 22:17:04,767 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:17:04,768 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:17:04,769 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:04,778 INFO L225 Difference]: With dead ends: 31 [2018-11-07 22:17:04,778 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 22:17:04,787 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 22:17:04,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 22:17:04,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 22:17:04,820 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 22:17:04,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-07 22:17:04,823 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-07 22:17:04,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:04,824 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-07 22:17:04,824 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:17:04,824 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-07 22:17:04,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:17:04,825 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:04,826 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:04,826 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:04,827 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:04,827 INFO L82 PathProgramCache]: Analyzing trace with hash -717461825, now seen corresponding path program 1 times [2018-11-07 22:17:04,827 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:04,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,829 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:04,829 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,829 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:04,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:04,931 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 22:17:04,931 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:17:04,932 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:17:04,932 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:04,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:17:04,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:17:04,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:17:04,935 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 3 states. [2018-11-07 22:17:04,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:04,974 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 22:17:04,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:17:04,975 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:17:04,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:04,976 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:17:04,976 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 22:17:04,977 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:17:04,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 22:17:04,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-11-07 22:17:04,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 22:17:04,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-07 22:17:04,982 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-07 22:17:04,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:04,983 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-07 22:17:04,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:17:04,983 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-07 22:17:04,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 22:17:04,983 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:04,984 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:04,984 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:04,984 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:04,984 INFO L82 PathProgramCache]: Analyzing trace with hash 514987241, now seen corresponding path program 1 times [2018-11-07 22:17:04,984 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:04,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,986 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:04,986 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:04,986 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:04,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:05,097 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 22:17:05,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:05,098 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:05,099 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 22:17:05,101 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [21], [27], [30], [32], [38], [39], [40], [42] [2018-11-07 22:17:05,136 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:17:05,137 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:17:05,239 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:17:05,401 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:17:05,402 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 22:17:05,411 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:05,413 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:17:05,413 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:05,413 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 22:17:05,436 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:05,436 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:05,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:05,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:05,584 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 22:17:05,585 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:06,083 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 22:17:06,105 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:06,105 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 8] total 13 [2018-11-07 22:17:06,105 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:06,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:17:06,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:17:06,107 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:17:06,107 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 7 states. [2018-11-07 22:17:06,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:06,190 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 22:17:06,191 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:17:06,191 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 22:17:06,191 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:06,192 INFO L225 Difference]: With dead ends: 31 [2018-11-07 22:17:06,192 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:17:06,193 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 22:17:06,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:17:06,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:17:06,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:17:06,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 22:17:06,198 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-11-07 22:17:06,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:06,199 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 22:17:06,199 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:17:06,199 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 22:17:06,200 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 22:17:06,200 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:06,200 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:06,200 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:06,200 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:06,201 INFO L82 PathProgramCache]: Analyzing trace with hash 1005624851, now seen corresponding path program 2 times [2018-11-07 22:17:06,201 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:06,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:06,202 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,203 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:06,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:06,320 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 22:17:06,321 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:06,321 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:06,321 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:06,321 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:06,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:06,322 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 22:17:06,341 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:06,341 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:06,383 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:17:06,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:06,385 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:06,531 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 22:17:06,531 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:06,677 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 22:17:06,703 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 22:17:06,704 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5] total 9 [2018-11-07 22:17:06,704 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:17:06,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:17:06,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:17:06,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:17:06,705 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 4 states. [2018-11-07 22:17:06,809 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:06,810 INFO L93 Difference]: Finished difference Result 32 states and 34 transitions. [2018-11-07 22:17:06,810 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:17:06,810 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2018-11-07 22:17:06,810 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:06,811 INFO L225 Difference]: With dead ends: 32 [2018-11-07 22:17:06,811 INFO L226 Difference]: Without dead ends: 27 [2018-11-07 22:17:06,812 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 22:17:06,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2018-11-07 22:17:06,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2018-11-07 22:17:06,816 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:17:06,817 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-07 22:17:06,817 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 19 [2018-11-07 22:17:06,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:06,817 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-07 22:17:06,817 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:17:06,818 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-07 22:17:06,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:17:06,818 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:06,819 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:06,819 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:06,819 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:06,819 INFO L82 PathProgramCache]: Analyzing trace with hash -422257669, now seen corresponding path program 1 times [2018-11-07 22:17:06,819 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:06,820 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,821 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:06,821 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:06,821 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:06,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:07,026 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 22:17:07,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,027 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:07,027 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-11-07 22:17:07,028 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [21], [27], [30], [32], [38], [39], [40], [42] [2018-11-07 22:17:07,029 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:17:07,029 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:17:07,034 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:17:07,170 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:17:07,171 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 22:17:07,178 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:07,178 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:17:07,178 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,179 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 22:17:07,188 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:07,188 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:07,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:07,211 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:07,370 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 22:17:07,370 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:07,677 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 22:17:07,697 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:07,697 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-11-07 22:17:07,698 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:07,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:17:07,698 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:17:07,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:17:07,699 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 6 states. [2018-11-07 22:17:07,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:07,798 INFO L93 Difference]: Finished difference Result 41 states and 44 transitions. [2018-11-07 22:17:07,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:17:07,799 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-11-07 22:17:07,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:07,800 INFO L225 Difference]: With dead ends: 41 [2018-11-07 22:17:07,800 INFO L226 Difference]: Without dead ends: 29 [2018-11-07 22:17:07,801 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 22:17:07,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2018-11-07 22:17:07,805 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2018-11-07 22:17:07,805 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2018-11-07 22:17:07,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 29 transitions. [2018-11-07 22:17:07,806 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 29 transitions. Word has length 23 [2018-11-07 22:17:07,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:07,807 INFO L480 AbstractCegarLoop]: Abstraction has 28 states and 29 transitions. [2018-11-07 22:17:07,807 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:17:07,807 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 29 transitions. [2018-11-07 22:17:07,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 22:17:07,808 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:07,808 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:07,808 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:07,809 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:07,809 INFO L82 PathProgramCache]: Analyzing trace with hash -659252443, now seen corresponding path program 2 times [2018-11-07 22:17:07,809 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:07,811 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:07,811 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:07,812 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:07,812 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:07,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:07,954 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 22:17:07,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,955 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:07,955 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:07,955 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:07,955 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:07,955 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 22:17:07,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:07,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:07,988 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:17:07,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:07,991 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:08,196 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 22:17:08,196 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:08,262 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 22:17:08,282 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:08,282 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2018-11-07 22:17:08,282 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:08,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:17:08,283 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:17:08,283 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=97, Unknown=0, NotChecked=0, Total=156 [2018-11-07 22:17:08,284 INFO L87 Difference]: Start difference. First operand 28 states and 29 transitions. Second operand 10 states. [2018-11-07 22:17:08,599 WARN L179 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 22:17:08,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:08,990 INFO L93 Difference]: Finished difference Result 63 states and 72 transitions. [2018-11-07 22:17:08,991 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:17:08,991 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2018-11-07 22:17:08,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:08,992 INFO L225 Difference]: With dead ends: 63 [2018-11-07 22:17:08,993 INFO L226 Difference]: Without dead ends: 51 [2018-11-07 22:17:08,993 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 22:17:08,994 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2018-11-07 22:17:08,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 44. [2018-11-07 22:17:08,999 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2018-11-07 22:17:09,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2018-11-07 22:17:09,001 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 27 [2018-11-07 22:17:09,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:09,001 INFO L480 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2018-11-07 22:17:09,001 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:17:09,001 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2018-11-07 22:17:09,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 22:17:09,003 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:09,003 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:09,003 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:09,003 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:09,003 INFO L82 PathProgramCache]: Analyzing trace with hash -1470926709, now seen corresponding path program 3 times [2018-11-07 22:17:09,003 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:09,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:09,004 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:09,004 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:09,004 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:09,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:09,339 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 22:17:09,339 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:09,339 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:09,340 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:09,340 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:09,340 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:09,341 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 22:17:09,353 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:09,354 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:09,385 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:09,385 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:09,388 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:09,434 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 22:17:09,434 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:10,019 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 22:17:10,040 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:10,040 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10, 11] total 20 [2018-11-07 22:17:10,040 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:10,041 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:17:10,041 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:17:10,041 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:17:10,042 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 11 states. [2018-11-07 22:17:10,362 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:10,362 INFO L93 Difference]: Finished difference Result 73 states and 80 transitions. [2018-11-07 22:17:10,363 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:17:10,363 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2018-11-07 22:17:10,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:10,364 INFO L225 Difference]: With dead ends: 73 [2018-11-07 22:17:10,365 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 22:17:10,365 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 76 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=119, Invalid=261, Unknown=0, NotChecked=0, Total=380 [2018-11-07 22:17:10,366 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 22:17:10,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2018-11-07 22:17:10,371 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2018-11-07 22:17:10,372 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2018-11-07 22:17:10,373 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 43 [2018-11-07 22:17:10,373 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:10,373 INFO L480 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2018-11-07 22:17:10,373 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:17:10,373 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2018-11-07 22:17:10,375 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2018-11-07 22:17:10,375 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:10,375 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 11, 9, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:10,375 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:10,375 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:10,376 INFO L82 PathProgramCache]: Analyzing trace with hash -1020521463, now seen corresponding path program 4 times [2018-11-07 22:17:10,376 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:10,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:10,377 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:10,377 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:10,377 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:10,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:10,681 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 22:17:10,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:10,682 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:10,682 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:10,682 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:10,682 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:10,682 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 22:17:10,693 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:10,694 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:10,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:10,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:10,779 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 22:17:10,779 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:11,195 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 22:17:11,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:11,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 13] total 25 [2018-11-07 22:17:11,216 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:11,216 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:17:11,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:17:11,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:17:11,217 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2018-11-07 22:17:11,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:11,791 INFO L93 Difference]: Finished difference Result 85 states and 92 transitions. [2018-11-07 22:17:11,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:17:11,792 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2018-11-07 22:17:11,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:11,794 INFO L225 Difference]: With dead ends: 85 [2018-11-07 22:17:11,794 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 22:17:11,796 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 98 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:17:11,796 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 22:17:11,804 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2018-11-07 22:17:11,804 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2018-11-07 22:17:11,805 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2018-11-07 22:17:11,805 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 55 [2018-11-07 22:17:11,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:11,806 INFO L480 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2018-11-07 22:17:11,806 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:17:11,806 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2018-11-07 22:17:11,807 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2018-11-07 22:17:11,807 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:11,808 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 14, 12, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:11,808 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:11,808 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:11,808 INFO L82 PathProgramCache]: Analyzing trace with hash 732260999, now seen corresponding path program 5 times [2018-11-07 22:17:11,808 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:11,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:11,809 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:11,809 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:11,810 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:11,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:12,463 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 22:17:12,463 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:12,463 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:12,463 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:12,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:12,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:12,464 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 22:17:12,473 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:12,473 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:12,490 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:17:12,490 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:12,493 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:12,646 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 22:17:12,647 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:12,812 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 22:17:12,832 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:12,833 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 6, 6] total 25 [2018-11-07 22:17:12,833 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:12,833 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:17:12,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:17:12,834 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=423, Unknown=0, NotChecked=0, Total=600 [2018-11-07 22:17:12,835 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 21 states. [2018-11-07 22:17:14,751 WARN L179 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 22:17:14,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:14,753 INFO L93 Difference]: Finished difference Result 115 states and 128 transitions. [2018-11-07 22:17:14,753 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:17:14,753 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 67 [2018-11-07 22:17:14,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:14,756 INFO L225 Difference]: With dead ends: 115 [2018-11-07 22:17:14,756 INFO L226 Difference]: Without dead ends: 99 [2018-11-07 22:17:14,757 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=314, Invalid=616, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:17:14,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2018-11-07 22:17:14,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 88. [2018-11-07 22:17:14,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2018-11-07 22:17:14,767 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2018-11-07 22:17:14,767 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 67 [2018-11-07 22:17:14,767 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:14,767 INFO L480 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2018-11-07 22:17:14,768 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:17:14,768 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2018-11-07 22:17:14,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 22:17:14,769 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:14,769 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:14,769 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:14,770 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:14,770 INFO L82 PathProgramCache]: Analyzing trace with hash -742753001, now seen corresponding path program 6 times [2018-11-07 22:17:14,770 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:14,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:14,771 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:14,771 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:14,771 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:14,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:15,322 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 22:17:15,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:15,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:15,323 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:15,323 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:15,323 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:15,323 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 22:17:15,334 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:15,334 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:15,383 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:15,383 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:15,387 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:15,760 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 22:17:15,760 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:17,405 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 22:17:17,425 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:17,425 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19, 20] total 40 [2018-11-07 22:17:17,425 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:17,425 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:17:17,426 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:17:17,427 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:17:17,427 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 22 states. [2018-11-07 22:17:19,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:19,029 INFO L93 Difference]: Finished difference Result 125 states and 135 transitions. [2018-11-07 22:17:19,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:17:19,030 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 87 [2018-11-07 22:17:19,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:19,031 INFO L225 Difference]: With dead ends: 125 [2018-11-07 22:17:19,031 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 22:17:19,032 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 155 SyntacticMatches, 2 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=438, Invalid=1122, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:17:19,033 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 22:17:19,040 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 104. [2018-11-07 22:17:19,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 104 states. [2018-11-07 22:17:19,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 104 states to 104 states and 107 transitions. [2018-11-07 22:17:19,042 INFO L78 Accepts]: Start accepts. Automaton has 104 states and 107 transitions. Word has length 87 [2018-11-07 22:17:19,043 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:19,043 INFO L480 AbstractCegarLoop]: Abstraction has 104 states and 107 transitions. [2018-11-07 22:17:19,043 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:17:19,043 INFO L276 IsEmpty]: Start isEmpty. Operand 104 states and 107 transitions. [2018-11-07 22:17:19,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-07 22:17:19,045 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:19,045 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 20, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:19,045 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:19,045 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:19,045 INFO L82 PathProgramCache]: Analyzing trace with hash 1462524863, now seen corresponding path program 7 times [2018-11-07 22:17:19,045 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:19,046 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:19,046 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:19,047 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:19,047 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:19,064 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:19,696 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 22:17:19,696 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:19,697 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:19,697 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:19,697 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:19,697 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:19,697 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 22:17:19,711 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:19,711 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:19,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:19,759 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:19,854 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 22:17:19,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:21,719 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 22:17:21,738 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:21,739 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23, 24] total 48 [2018-11-07 22:17:21,739 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:21,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:17:21,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:17:21,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:17:21,741 INFO L87 Difference]: Start difference. First operand 104 states and 107 transitions. Second operand 26 states. [2018-11-07 22:17:23,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:23,431 INFO L93 Difference]: Finished difference Result 141 states and 151 transitions. [2018-11-07 22:17:23,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:17:23,433 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2018-11-07 22:17:23,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:23,435 INFO L225 Difference]: With dead ends: 141 [2018-11-07 22:17:23,435 INFO L226 Difference]: Without dead ends: 121 [2018-11-07 22:17:23,436 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 183 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2018-11-07 22:17:23,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2018-11-07 22:17:23,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 120. [2018-11-07 22:17:23,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 120 states. [2018-11-07 22:17:23,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 120 states to 120 states and 123 transitions. [2018-11-07 22:17:23,448 INFO L78 Accepts]: Start accepts. Automaton has 120 states and 123 transitions. Word has length 103 [2018-11-07 22:17:23,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:23,448 INFO L480 AbstractCegarLoop]: Abstraction has 120 states and 123 transitions. [2018-11-07 22:17:23,448 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:17:23,448 INFO L276 IsEmpty]: Start isEmpty. Operand 120 states and 123 transitions. [2018-11-07 22:17:23,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 22:17:23,450 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:23,451 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 24, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:23,451 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:23,451 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:23,451 INFO L82 PathProgramCache]: Analyzing trace with hash 379316839, now seen corresponding path program 8 times [2018-11-07 22:17:23,451 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:23,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:23,452 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:23,452 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:23,453 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:23,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:24,066 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 22:17:24,066 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:24,067 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:24,067 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:24,067 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:24,067 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:24,067 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 22:17:24,078 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:24,078 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:24,099 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:17:24,099 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:24,104 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:24,325 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 22:17:24,325 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:24,598 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 22:17:24,624 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:24,625 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 7, 7] total 40 [2018-11-07 22:17:24,625 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:24,625 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2018-11-07 22:17:24,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2018-11-07 22:17:24,626 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=372, Invalid=1188, Unknown=0, NotChecked=0, Total=1560 [2018-11-07 22:17:24,626 INFO L87 Difference]: Start difference. First operand 120 states and 123 transitions. Second operand 35 states. [2018-11-07 22:17:26,363 WARN L179 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 10 [2018-11-07 22:17:28,988 WARN L179 SmtUtils]: Spent 2.33 s on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:17:33,930 WARN L179 SmtUtils]: Spent 332.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 22:17:34,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:34,312 INFO L93 Difference]: Finished difference Result 179 states and 196 transitions. [2018-11-07 22:17:34,312 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2018-11-07 22:17:34,312 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 119 [2018-11-07 22:17:34,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:34,314 INFO L225 Difference]: With dead ends: 179 [2018-11-07 22:17:34,315 INFO L226 Difference]: Without dead ends: 159 [2018-11-07 22:17:34,316 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 279 GetRequests, 232 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=708, Invalid=1644, Unknown=0, NotChecked=0, Total=2352 [2018-11-07 22:17:34,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2018-11-07 22:17:34,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 144. [2018-11-07 22:17:34,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2018-11-07 22:17:34,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 148 transitions. [2018-11-07 22:17:34,330 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 148 transitions. Word has length 119 [2018-11-07 22:17:34,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:34,331 INFO L480 AbstractCegarLoop]: Abstraction has 144 states and 148 transitions. [2018-11-07 22:17:34,331 INFO L481 AbstractCegarLoop]: Interpolant automaton has 35 states. [2018-11-07 22:17:34,331 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 148 transitions. [2018-11-07 22:17:34,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2018-11-07 22:17:34,333 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:34,333 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 33, 29, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:34,334 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:34,334 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:34,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1811900639, now seen corresponding path program 9 times [2018-11-07 22:17:34,334 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:34,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:34,335 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:34,335 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:34,335 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:34,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:35,197 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 22:17:35,198 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:35,198 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:35,198 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:35,198 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:35,199 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:35,199 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 22:17:35,213 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:17:35,213 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:17:35,267 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:17:35,267 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:35,272 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:35,387 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 22:17:35,387 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:40,035 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 22:17:40,054 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:40,055 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 34, 35] total 69 [2018-11-07 22:17:40,055 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:40,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:17:40,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:17:40,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1291, Invalid=3401, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:17:40,057 INFO L87 Difference]: Start difference. First operand 144 states and 148 transitions. Second operand 36 states. [2018-11-07 22:17:42,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:42,492 INFO L93 Difference]: Finished difference Result 185 states and 197 transitions. [2018-11-07 22:17:42,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2018-11-07 22:17:42,492 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 143 [2018-11-07 22:17:42,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:42,494 INFO L225 Difference]: With dead ends: 185 [2018-11-07 22:17:42,494 INFO L226 Difference]: Without dead ends: 161 [2018-11-07 22:17:42,497 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 322 GetRequests, 252 SyntacticMatches, 3 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=1291, Invalid=3401, Unknown=0, NotChecked=0, Total=4692 [2018-11-07 22:17:42,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 161 states. [2018-11-07 22:17:42,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 161 to 160. [2018-11-07 22:17:42,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2018-11-07 22:17:42,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 164 transitions. [2018-11-07 22:17:42,510 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 164 transitions. Word has length 143 [2018-11-07 22:17:42,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:42,511 INFO L480 AbstractCegarLoop]: Abstraction has 160 states and 164 transitions. [2018-11-07 22:17:42,511 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:17:42,511 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 164 transitions. [2018-11-07 22:17:42,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2018-11-07 22:17:42,514 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:42,514 INFO L375 BasicCegarLoop]: trace histogram [38, 37, 37, 33, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:42,514 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:42,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:42,515 INFO L82 PathProgramCache]: Analyzing trace with hash 426139081, now seen corresponding path program 10 times [2018-11-07 22:17:42,515 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:42,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:42,516 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:17:42,516 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:42,516 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:42,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:43,741 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 22:17:43,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:43,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:43,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:43,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:43,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:43,742 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 22:17:43,751 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:43,751 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:17:43,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:43,799 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:44,043 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 22:17:44,044 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:17:48,809 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 22:17:48,829 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:17:48,829 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 36, 37] total 75 [2018-11-07 22:17:48,829 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:17:48,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2018-11-07 22:17:48,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2018-11-07 22:17:48,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1515, Invalid=4035, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:17:48,832 INFO L87 Difference]: Start difference. First operand 160 states and 164 transitions. Second operand 40 states. [2018-11-07 22:17:51,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:17:51,771 INFO L93 Difference]: Finished difference Result 201 states and 213 transitions. [2018-11-07 22:17:51,772 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2018-11-07 22:17:51,772 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 159 [2018-11-07 22:17:51,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:17:51,773 INFO L225 Difference]: With dead ends: 201 [2018-11-07 22:17:51,773 INFO L226 Difference]: Without dead ends: 177 [2018-11-07 22:17:51,775 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 358 GetRequests, 282 SyntacticMatches, 3 SemanticMatches, 73 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1515, Invalid=4035, Unknown=0, NotChecked=0, Total=5550 [2018-11-07 22:17:51,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 177 states. [2018-11-07 22:17:51,785 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 177 to 176. [2018-11-07 22:17:51,786 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 176 states. [2018-11-07 22:17:51,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 176 states to 176 states and 180 transitions. [2018-11-07 22:17:51,787 INFO L78 Accepts]: Start accepts. Automaton has 176 states and 180 transitions. Word has length 159 [2018-11-07 22:17:51,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:17:51,788 INFO L480 AbstractCegarLoop]: Abstraction has 176 states and 180 transitions. [2018-11-07 22:17:51,788 INFO L481 AbstractCegarLoop]: Interpolant automaton has 40 states. [2018-11-07 22:17:51,788 INFO L276 IsEmpty]: Start isEmpty. Operand 176 states and 180 transitions. [2018-11-07 22:17:51,791 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-11-07 22:17:51,791 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:17:51,791 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 37, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:17:51,791 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:17:51,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:17:51,792 INFO L82 PathProgramCache]: Analyzing trace with hash -2047224719, now seen corresponding path program 11 times [2018-11-07 22:17:51,792 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:17:51,792 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:51,793 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:17:51,793 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:17:51,793 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:17:51,815 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:17:52,976 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 22:17:52,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,977 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:17:52,977 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:17:52,977 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:17:52,977 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:17:52,978 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 22:17:53,000 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:17:53,000 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:17:55,277 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 22:17:55,277 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:17:55,290 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:17:58,275 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 22:17:58,275 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:01,681 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 22:18:01,703 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:01,703 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 9, 9] total 58 [2018-11-07 22:18:01,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:01,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2018-11-07 22:18:01,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2018-11-07 22:18:01,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=581, Invalid=2724, Unknown=1, NotChecked=0, Total=3306 [2018-11-07 22:18:01,706 INFO L87 Difference]: Start difference. First operand 176 states and 180 transitions. Second operand 51 states. [2018-11-07 22:18:12,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:12,928 INFO L93 Difference]: Finished difference Result 227 states and 243 transitions. [2018-11-07 22:18:12,929 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2018-11-07 22:18:12,929 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 175 [2018-11-07 22:18:12,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:12,931 INFO L225 Difference]: With dead ends: 227 [2018-11-07 22:18:12,932 INFO L226 Difference]: Without dead ends: 203 [2018-11-07 22:18:12,933 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 395 GetRequests, 335 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=632, Invalid=2789, Unknown=1, NotChecked=0, Total=3422 [2018-11-07 22:18:12,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 203 states. [2018-11-07 22:18:12,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 203 to 201. [2018-11-07 22:18:12,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 201 states. [2018-11-07 22:18:12,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 204 transitions. [2018-11-07 22:18:12,945 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 204 transitions. Word has length 175 [2018-11-07 22:18:12,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:12,945 INFO L480 AbstractCegarLoop]: Abstraction has 201 states and 204 transitions. [2018-11-07 22:18:12,945 INFO L481 AbstractCegarLoop]: Interpolant automaton has 51 states. [2018-11-07 22:18:12,946 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 204 transitions. [2018-11-07 22:18:12,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2018-11-07 22:18:12,947 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:12,947 INFO L375 BasicCegarLoop]: trace histogram [48, 47, 47, 42, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:12,948 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:12,948 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:12,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1093808597, now seen corresponding path program 12 times [2018-11-07 22:18:12,948 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:12,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:12,949 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:12,949 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:12,949 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:12,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:15,047 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 22:18:15,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:15,047 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:15,047 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:15,047 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:15,047 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:15,047 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 22:18:15,058 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:15,058 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:15,112 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:15,112 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:15,117 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:15,360 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 22:18:15,360 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:22,831 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 22:18:22,851 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:22,852 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 45, 46] total 94 [2018-11-07 22:18:22,852 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:22,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2018-11-07 22:18:22,853 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2018-11-07 22:18:22,855 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2298, Invalid=6444, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 22:18:22,855 INFO L87 Difference]: Start difference. First operand 201 states and 204 transitions. Second operand 50 states. [2018-11-07 22:18:27,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:27,702 INFO L93 Difference]: Finished difference Result 255 states and 267 transitions. [2018-11-07 22:18:27,702 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2018-11-07 22:18:27,702 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 199 [2018-11-07 22:18:27,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:27,705 INFO L225 Difference]: With dead ends: 255 [2018-11-07 22:18:27,705 INFO L226 Difference]: Without dead ends: 226 [2018-11-07 22:18:27,708 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 353 SyntacticMatches, 2 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=2298, Invalid=6444, Unknown=0, NotChecked=0, Total=8742 [2018-11-07 22:18:27,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 226 states. [2018-11-07 22:18:27,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 226 to 225. [2018-11-07 22:18:27,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 225 states. [2018-11-07 22:18:27,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 228 transitions. [2018-11-07 22:18:27,722 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 228 transitions. Word has length 199 [2018-11-07 22:18:27,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:27,722 INFO L480 AbstractCegarLoop]: Abstraction has 225 states and 228 transitions. [2018-11-07 22:18:27,723 INFO L481 AbstractCegarLoop]: Interpolant automaton has 50 states. [2018-11-07 22:18:27,723 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 228 transitions. [2018-11-07 22:18:27,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2018-11-07 22:18:27,724 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:27,724 INFO L375 BasicCegarLoop]: trace histogram [54, 53, 53, 48, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:27,725 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:27,725 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:27,725 INFO L82 PathProgramCache]: Analyzing trace with hash 17397287, now seen corresponding path program 13 times [2018-11-07 22:18:27,725 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:27,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:27,726 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:27,726 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:27,726 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:27,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:29,782 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 22:18:29,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:29,783 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:29,783 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:29,783 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:29,783 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:29,783 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 22:18:29,792 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:29,792 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:29,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:29,857 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:30,021 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 22:18:30,022 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:39,668 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 22:18:39,687 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:39,688 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 51, 52] total 106 [2018-11-07 22:18:39,688 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:39,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2018-11-07 22:18:39,689 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2018-11-07 22:18:39,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2910, Invalid=8220, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 22:18:39,690 INFO L87 Difference]: Start difference. First operand 225 states and 228 transitions. Second operand 56 states. [2018-11-07 22:18:45,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:45,066 INFO L93 Difference]: Finished difference Result 279 states and 291 transitions. [2018-11-07 22:18:45,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-11-07 22:18:45,067 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 223 [2018-11-07 22:18:45,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:45,069 INFO L225 Difference]: With dead ends: 279 [2018-11-07 22:18:45,069 INFO L226 Difference]: Without dead ends: 250 [2018-11-07 22:18:45,071 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 501 GetRequests, 395 SyntacticMatches, 2 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=2910, Invalid=8220, Unknown=0, NotChecked=0, Total=11130 [2018-11-07 22:18:45,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 250 states. [2018-11-07 22:18:45,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 250 to 249. [2018-11-07 22:18:45,086 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 249 states. [2018-11-07 22:18:45,087 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 252 transitions. [2018-11-07 22:18:45,087 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 252 transitions. Word has length 223 [2018-11-07 22:18:45,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:45,088 INFO L480 AbstractCegarLoop]: Abstraction has 249 states and 252 transitions. [2018-11-07 22:18:45,088 INFO L481 AbstractCegarLoop]: Interpolant automaton has 56 states. [2018-11-07 22:18:45,088 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 252 transitions. [2018-11-07 22:18:45,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 22:18:45,089 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:45,089 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 54, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:45,090 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:45,090 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:45,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1542723037, now seen corresponding path program 14 times [2018-11-07 22:18:45,090 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:45,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:45,091 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:45,091 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:45,091 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:45,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:47,055 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 22:18:47,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:47,056 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:47,056 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:47,056 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:47,056 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:47,056 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 22:18:47,066 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:47,066 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:51,582 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:18:51,582 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:51,628 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:52,138 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 22:18:52,138 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:52,755 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 22:18:52,775 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:52,776 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 9, 9] total 76 [2018-11-07 22:18:52,776 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:52,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 69 states [2018-11-07 22:18:52,777 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2018-11-07 22:18:52,777 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4683, Unknown=0, NotChecked=0, Total=5700 [2018-11-07 22:18:52,778 INFO L87 Difference]: Start difference. First operand 249 states and 252 transitions. Second operand 69 states. [2018-11-07 22:19:01,729 WARN L179 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 10 [2018-11-07 22:19:04,079 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967295) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967294) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967292) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967293) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967290) 4294967296) 500000)) is different from false [2018-11-07 22:19:08,538 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967295) 4294967296) 500000) (< (mod c_main_~x~0 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967294) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967292) 4294967296) 500000) (< (mod (+ c_main_~x~0 4294967293) 4294967296) 500000)) is different from false [2018-11-07 22:19:11,738 WARN L179 SmtUtils]: Spent 766.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:19:22,020 WARN L179 SmtUtils]: Spent 1.90 s on a formula simplification. DAG size of input: 16 DAG size of output: 12 [2018-11-07 22:19:31,340 WARN L179 SmtUtils]: Spent 2.09 s on a formula simplification. DAG size of input: 18 DAG size of output: 10 [2018-11-07 22:19:34,740 WARN L179 SmtUtils]: Spent 384.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 10 [2018-11-07 22:19:34,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:19:34,745 INFO L93 Difference]: Finished difference Result 331 states and 350 transitions. [2018-11-07 22:19:34,745 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2018-11-07 22:19:34,745 INFO L78 Accepts]: Start accepts. Automaton has 69 states. Word has length 247 [2018-11-07 22:19:34,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:19:34,747 INFO L225 Difference]: With dead ends: 331 [2018-11-07 22:19:34,747 INFO L226 Difference]: Without dead ends: 302 [2018-11-07 22:19:34,748 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 575 GetRequests, 486 SyntacticMatches, 0 SemanticMatches, 89 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 84 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=1945, Invalid=5888, Unknown=7, NotChecked=350, Total=8190 [2018-11-07 22:19:34,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2018-11-07 22:19:34,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 280. [2018-11-07 22:19:34,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 280 states. [2018-11-07 22:19:34,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 280 states to 280 states and 283 transitions. [2018-11-07 22:19:34,765 INFO L78 Accepts]: Start accepts. Automaton has 280 states and 283 transitions. Word has length 247 [2018-11-07 22:19:34,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:19:34,766 INFO L480 AbstractCegarLoop]: Abstraction has 280 states and 283 transitions. [2018-11-07 22:19:34,766 INFO L481 AbstractCegarLoop]: Interpolant automaton has 69 states. [2018-11-07 22:19:34,766 INFO L276 IsEmpty]: Start isEmpty. Operand 280 states and 283 transitions. [2018-11-07 22:19:34,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 280 [2018-11-07 22:19:34,768 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:19:34,768 INFO L375 BasicCegarLoop]: trace histogram [68, 67, 67, 61, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:19:34,768 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:19:34,768 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:19:34,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1860249137, now seen corresponding path program 15 times [2018-11-07 22:19:34,769 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:19:34,769 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:34,769 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:19:34,770 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:19:34,770 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:19:34,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:19:37,540 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 22:19:37,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:37,541 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:19:37,541 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:19:37,541 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:19:37,541 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:19:37,542 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 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 22:19:37,558 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:19:37,558 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:19:37,645 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:19:37,645 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:37,653 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:37,901 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 22:19:37,902 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:19:54,055 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 22:19:54,075 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:19:54,075 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [70, 66, 67] total 135 [2018-11-07 22:19:54,075 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:19:54,076 INFO L459 AbstractCegarLoop]: Interpolant automaton has 70 states [2018-11-07 22:19:54,076 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 70 interpolants. [2018-11-07 22:19:54,078 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4755, Invalid=13335, Unknown=0, NotChecked=0, Total=18090 [2018-11-07 22:19:54,078 INFO L87 Difference]: Start difference. First operand 280 states and 283 transitions. Second operand 70 states. [2018-11-07 22:20:02,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:02,584 INFO L93 Difference]: Finished difference Result 337 states and 349 transitions. [2018-11-07 22:20:02,584 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 69 states. [2018-11-07 22:20:02,585 INFO L78 Accepts]: Start accepts. Automaton has 70 states. Word has length 279 [2018-11-07 22:20:02,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:02,587 INFO L225 Difference]: With dead ends: 337 [2018-11-07 22:20:02,587 INFO L226 Difference]: Without dead ends: 305 [2018-11-07 22:20:02,589 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 628 GetRequests, 492 SyntacticMatches, 3 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 18.6s TimeCoverageRelationStatistics Valid=4755, Invalid=13335, Unknown=0, NotChecked=0, Total=18090 [2018-11-07 22:20:02,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2018-11-07 22:20:02,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 304. [2018-11-07 22:20:02,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 304 states. [2018-11-07 22:20:02,609 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 304 states to 304 states and 307 transitions. [2018-11-07 22:20:02,610 INFO L78 Accepts]: Start accepts. Automaton has 304 states and 307 transitions. Word has length 279 [2018-11-07 22:20:02,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:02,610 INFO L480 AbstractCegarLoop]: Abstraction has 304 states and 307 transitions. [2018-11-07 22:20:02,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 70 states. [2018-11-07 22:20:02,610 INFO L276 IsEmpty]: Start isEmpty. Operand 304 states and 307 transitions. [2018-11-07 22:20:02,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 304 [2018-11-07 22:20:02,612 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:02,612 INFO L375 BasicCegarLoop]: trace histogram [74, 73, 73, 67, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:02,613 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:02,613 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:02,613 INFO L82 PathProgramCache]: Analyzing trace with hash -1582860755, now seen corresponding path program 16 times [2018-11-07 22:20:02,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:02,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:02,614 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:20:02,614 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:02,614 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:02,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:05,588 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 22:20:05,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:05,589 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:05,589 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:05,589 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:05,589 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:05,589 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 22:20:05,598 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:05,598 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:20:05,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:05,682 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:05,913 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 22:20:05,913 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:21,857 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 22:20:21,878 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:21,879 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 70, 71] total 145 [2018-11-07 22:20:21,879 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:21,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 22:20:21,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 22:20:21,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5467, Invalid=15413, Unknown=0, NotChecked=0, Total=20880 [2018-11-07 22:20:21,880 INFO L87 Difference]: Start difference. First operand 304 states and 307 transitions. Second operand 76 states. [2018-11-07 22:20:31,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:31,327 INFO L93 Difference]: Finished difference Result 361 states and 373 transitions. [2018-11-07 22:20:31,331 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2018-11-07 22:20:31,331 INFO L78 Accepts]: Start accepts. Automaton has 76 states. Word has length 303 [2018-11-07 22:20:31,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:31,333 INFO L225 Difference]: With dead ends: 361 [2018-11-07 22:20:31,333 INFO L226 Difference]: Without dead ends: 329 [2018-11-07 22:20:31,334 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 536 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 18.5s TimeCoverageRelationStatistics Valid=5467, Invalid=15413, Unknown=0, NotChecked=0, Total=20880 [2018-11-07 22:20:31,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 329 states. [2018-11-07 22:20:31,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 329 to 328. [2018-11-07 22:20:31,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 328 states. [2018-11-07 22:20:31,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 331 transitions. [2018-11-07 22:20:31,356 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 331 transitions. Word has length 303 [2018-11-07 22:20:31,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:31,357 INFO L480 AbstractCegarLoop]: Abstraction has 328 states and 331 transitions. [2018-11-07 22:20:31,357 INFO L481 AbstractCegarLoop]: Interpolant automaton has 76 states. [2018-11-07 22:20:31,357 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 331 transitions. [2018-11-07 22:20:31,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 328 [2018-11-07 22:20:31,359 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:31,359 INFO L375 BasicCegarLoop]: trace histogram [80, 79, 79, 73, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:31,360 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:31,360 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:31,360 INFO L82 PathProgramCache]: Analyzing trace with hash 1773965865, now seen corresponding path program 17 times [2018-11-07 22:20:31,360 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:31,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:31,361 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:31,361 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:31,361 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:31,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:34,563 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 22:20:34,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:34,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:34,563 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:34,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:34,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:34,563 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 22:20:34,573 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:20:34,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:20:34,756 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2018-11-07 22:20:34,756 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:20:34,763 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:35,523 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 22:20:35,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:36,326 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 22:20:36,347 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:36,347 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 10, 10] total 98 [2018-11-07 22:20:36,347 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:36,348 INFO L459 AbstractCegarLoop]: Interpolant automaton has 90 states [2018-11-07 22:20:36,348 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2018-11-07 22:20:36,348 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1581, Invalid=7925, Unknown=0, NotChecked=0, Total=9506 [2018-11-07 22:20:36,349 INFO L87 Difference]: Start difference. First operand 328 states and 331 transitions. Second operand 90 states. [2018-11-07 22:21:06,249 WARN L179 SmtUtils]: Spent 10.25 s on a formula simplification. DAG size of input: 34 DAG size of output: 10 [2018-11-07 22:21:16,467 WARN L179 SmtUtils]: Spent 6.54 s on a formula simplification. DAG size of input: 32 DAG size of output: 16 [2018-11-07 22:21:24,839 WARN L179 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 Received shutdown request... [2018-11-07 22:21:27,735 WARN L187 SmtUtils]: Removed 1 from assertion stack [2018-11-07 22:21:27,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2018-11-07 22:21:27,735 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:21:27,739 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:21:27,739 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:21:27 BoogieIcfgContainer [2018-11-07 22:21:27,739 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:21:27,739 INFO L168 Benchmark]: Toolchain (without parser) took 264129.86 ms. Allocated memory was 1.5 GB in the beginning and 2.4 GB in the end (delta: 909.1 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -707.0 MB). Peak memory consumption was 202.1 MB. Max. memory is 7.1 GB. [2018-11-07 22:21:27,740 INFO L168 Benchmark]: CDTParser took 0.20 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 22:21:27,741 INFO L168 Benchmark]: CACSL2BoogieTranslator took 304.08 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 22:21:27,742 INFO L168 Benchmark]: Boogie Procedure Inliner took 25.18 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 22:21:27,742 INFO L168 Benchmark]: Boogie Preprocessor took 29.88 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 22:21:27,742 INFO L168 Benchmark]: RCFGBuilder took 422.42 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 759.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -814.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-11-07 22:21:27,743 INFO L168 Benchmark]: TraceAbstraction took 263343.78 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 149.9 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 96.9 MB). Peak memory consumption was 246.8 MB. Max. memory is 7.1 GB. [2018-11-07 22:21:27,747 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 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 304.08 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 25.18 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 29.88 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 422.42 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 759.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -814.5 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 263343.78 ms. Allocated memory was 2.3 GB in the beginning and 2.4 GB in the end (delta: 149.9 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 96.9 MB). Peak memory consumption was 246.8 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 84 states, 90 states before enhancement),while PredicateUnifier was unifying predicates,while SimplifyDDAWithTimeout was simplifying term of DAG size 24. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. TIMEOUT Result, 263.2s OverallTime, 21 OverallIterations, 80 TraceHistogramMax, 155.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 846 SDtfs, 2715 SDslu, 33295 SDs, 0 SdLazy, 94005 SolverSat, 604 SolverUnsat, 5 SolverUnknown, 0 SolverNotchecked, 69.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5929 GetRequests, 4797 SyntacticMatches, 31 SemanticMatches, 1100 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 617 ImplicationChecksByTransitivity, 165.2s 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, 73 StatesRemovedByMinimization, 19 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 7.9s SatisfiabilityAnalysisTime, 97.6s 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