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/Mono6_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:18:21,904 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:18:21,906 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:18:21,922 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:18:21,922 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:18:21,923 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:18:21,924 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:18:21,926 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:18:21,928 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:18:21,929 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:18:21,931 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:18:21,931 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:18:21,932 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:18:21,935 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:18:21,939 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:18:21,940 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:18:21,943 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:18:21,945 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:18:21,947 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:18:21,948 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:18:21,949 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:18:21,950 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:18:21,953 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:18:21,953 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:18:21,953 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:18:21,957 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:18:21,958 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:18:21,959 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:18:21,962 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:18:21,964 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:18:21,964 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:18:21,964 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:18:21,969 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 22:18:21,984 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:18:21,984 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:18:21,985 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:18:21,985 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:18:21,985 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:18:21,986 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:18:21,986 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:18:21,986 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:18:21,986 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:18:21,986 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:18:21,986 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:18:21,987 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:18:21,987 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:18:21,988 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:18:21,988 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:18:21,988 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:18:21,988 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:18:21,988 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:18:21,989 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:18:21,989 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:18:21,989 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:18:21,989 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:18:21,989 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:18:21,990 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:18:21,990 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:18:21,990 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:18:21,990 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:18:21,990 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:18:21,991 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:18:21,991 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:18:21,991 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:18:21,991 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:18:21,991 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:18:21,992 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:18:21,992 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:18:22,047 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:18:22,065 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:18:22,069 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:18:22,071 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:18:22,071 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:18:22,072 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-11-07 22:18:22,140 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33030d4d/23ffa36303b2459abcc343f32abc758f/FLAG9d9d1071f [2018-11-07 22:18:22,646 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:18:22,646 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-11-07 22:18:22,653 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33030d4d/23ffa36303b2459abcc343f32abc758f/FLAG9d9d1071f [2018-11-07 22:18:22,666 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e33030d4d/23ffa36303b2459abcc343f32abc758f [2018-11-07 22:18:22,678 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:18:22,680 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:18:22,681 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:18:22,681 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:18:22,685 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:18:22,686 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,689 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2838e893 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22, skipping insertion in model container [2018-11-07 22:18:22,690 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,700 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:18:22,726 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:18:22,907 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:18:22,910 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:18:22,928 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:18:22,945 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:18:22,945 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22 WrapperNode [2018-11-07 22:18:22,946 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:18:22,947 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:18:22,947 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:18:22,947 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:18:22,957 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,963 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,970 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:18:22,970 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:18:22,970 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:18:22,971 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:18:22,982 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,982 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,983 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,984 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:22,991 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:23,001 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:23,004 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (1/1) ... [2018-11-07 22:18:23,006 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:18:23,006 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:18:23,006 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:18:23,006 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:18:23,007 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (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 22:18:23,185 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:18:23,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:18:23,186 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:18:23,186 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:18:23,186 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:18:23,187 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:18:23,187 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:18:23,187 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:18:23,442 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:18:23,442 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:18:23 BoogieIcfgContainer [2018-11-07 22:18:23,443 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:18:23,444 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:18:23,444 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:18:23,448 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:18:23,448 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:18:22" (1/3) ... [2018-11-07 22:18:23,449 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc0751 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:18:23, skipping insertion in model container [2018-11-07 22:18:23,449 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:18:22" (2/3) ... [2018-11-07 22:18:23,449 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc0751 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:18:23, skipping insertion in model container [2018-11-07 22:18:23,449 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:18:23" (3/3) ... [2018-11-07 22:18:23,455 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono6_false-unreach-call1.c [2018-11-07 22:18:23,482 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:18:23,494 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:18:23,519 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:18:23,560 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:18:23,560 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:18:23,560 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:18:23,561 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:18:23,561 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:18:23,561 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:18:23,561 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:18:23,561 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:18:23,594 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 22:18:23,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:18:23,610 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:23,611 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:23,615 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:23,621 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:23,621 INFO L82 PathProgramCache]: Analyzing trace with hash -2008095039, now seen corresponding path program 1 times [2018-11-07 22:18:23,626 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:23,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,670 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:23,670 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,671 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:23,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:23,737 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 22:18:23,740 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:18:23,740 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:18:23,740 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:23,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:18:23,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:18:23,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:18:23,763 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 22:18:23,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:23,792 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-07 22:18:23,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:18:23,793 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:18:23,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:23,802 INFO L225 Difference]: With dead ends: 33 [2018-11-07 22:18:23,802 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 22:18:23,808 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 22:18:23,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 22:18:23,838 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 22:18:23,839 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 22:18:23,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-07 22:18:23,842 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-07 22:18:23,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:23,843 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-07 22:18:23,843 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:18:23,843 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-07 22:18:23,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:18:23,844 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:23,844 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:23,844 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:23,845 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:23,845 INFO L82 PathProgramCache]: Analyzing trace with hash 1715940768, now seen corresponding path program 1 times [2018-11-07 22:18:23,845 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:23,846 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,847 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:23,848 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:23,848 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:23,891 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:24,041 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 22:18:24,042 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:18:24,042 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-07 22:18:24,042 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:24,044 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:18:24,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:18:24,045 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 22:18:24,045 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2018-11-07 22:18:24,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:24,122 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 22:18:24,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:18:24,122 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-11-07 22:18:24,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:24,123 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:18:24,123 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 22:18:24,124 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 22:18:24,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 22:18:24,128 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-11-07 22:18:24,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 22:18:24,129 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-07 22:18:24,130 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-07 22:18:24,130 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:24,130 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-07 22:18:24,130 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:18:24,131 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-07 22:18:24,131 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 22:18:24,131 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:24,132 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:24,132 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:24,132 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:24,133 INFO L82 PathProgramCache]: Analyzing trace with hash 1048902920, now seen corresponding path program 1 times [2018-11-07 22:18:24,133 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:24,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:24,134 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:24,134 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:24,134 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:24,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:24,352 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 22:18:24,353 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:24,353 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:24,356 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 22:18:24,358 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-11-07 22:18:24,402 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:18:24,402 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:18:24,514 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:18:24,651 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:18:24,653 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 22:18:24,676 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:24,678 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:18:24,678 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:24,678 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 22:18:24,689 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:24,689 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:24,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:24,716 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:24,963 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 22:18:24,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:25,075 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 22:18:25,096 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:25,096 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2018-11-07 22:18:25,096 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:25,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 22:18:25,097 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 22:18:25,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:25,098 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 7 states. [2018-11-07 22:18:25,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:25,156 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 22:18:25,157 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:18:25,157 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 22:18:25,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:25,158 INFO L225 Difference]: With dead ends: 31 [2018-11-07 22:18:25,158 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:18:25,159 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:25,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:18:25,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:18:25,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:18:25,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 22:18:25,164 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-11-07 22:18:25,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:25,164 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 22:18:25,165 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 22:18:25,165 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 22:18:25,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 22:18:25,166 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:25,166 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:25,166 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:25,166 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:25,167 INFO L82 PathProgramCache]: Analyzing trace with hash 452778096, now seen corresponding path program 2 times [2018-11-07 22:18:25,167 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:25,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:25,168 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:25,168 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:25,168 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:25,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:25,490 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 22:18:25,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:25,491 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:25,491 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:25,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:25,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:25,491 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 22:18:25,509 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:25,510 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:25,530 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2018-11-07 22:18:25,530 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:25,533 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:25,823 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-11-07 22:18:25,824 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:26,002 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-11-07 22:18:26,025 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 22:18:26,025 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [6] total 14 [2018-11-07 22:18:26,026 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:18:26,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:18:26,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:18:26,026 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:18:26,027 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-11-07 22:18:26,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:26,442 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 22:18:26,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:18:26,443 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-07 22:18:26,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:26,444 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:18:26,445 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 22:18:26,445 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2018-11-07 22:18:26,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 22:18:26,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-07 22:18:26,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-07 22:18:26,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-11-07 22:18:26,451 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2018-11-07 22:18:26,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:26,452 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-11-07 22:18:26,452 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:18:26,452 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-11-07 22:18:26,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:18:26,453 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:26,453 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:26,454 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:26,454 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:26,454 INFO L82 PathProgramCache]: Analyzing trace with hash 671507994, now seen corresponding path program 1 times [2018-11-07 22:18:26,454 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:26,455 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:26,455 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:26,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:26,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:26,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:26,647 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 22:18:26,648 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:26,648 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:26,648 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-11-07 22:18:26,648 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-11-07 22:18:26,650 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:18:26,650 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:18:26,658 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:18:26,779 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:18:26,782 INFO L272 AbstractInterpreter]: Visited 15 different actions 88 times. Merged at 6 different actions 42 times. Widened at 1 different actions 4 times. Found 9 fixpoints after 4 different actions. Largest state had 5 variables. [2018-11-07 22:18:26,791 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:26,791 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:18:26,791 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:26,791 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 22:18:26,800 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:26,800 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:26,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:26,828 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:26,854 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 22:18:26,855 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:26,942 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 22:18:26,962 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:26,963 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2018-11-07 22:18:26,963 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:26,963 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:18:26,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:18:26,964 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:26,964 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 6 states. [2018-11-07 22:18:27,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:27,407 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-11-07 22:18:27,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:18:27,409 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-11-07 22:18:27,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:27,410 INFO L225 Difference]: With dead ends: 39 [2018-11-07 22:18:27,410 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 22:18:27,411 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 22:18:27,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 22:18:27,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-11-07 22:18:27,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 22:18:27,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-11-07 22:18:27,416 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 23 [2018-11-07 22:18:27,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:27,417 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-11-07 22:18:27,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:18:27,417 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-11-07 22:18:27,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 22:18:27,418 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:27,418 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:27,418 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:27,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:27,419 INFO L82 PathProgramCache]: Analyzing trace with hash 1681938818, now seen corresponding path program 2 times [2018-11-07 22:18:27,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:27,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:27,420 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:27,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:27,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:27,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:27,591 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:27,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:27,591 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:27,591 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:27,591 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:27,591 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:27,592 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 22:18:27,602 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:27,602 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:27,614 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:18:27,614 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:27,616 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:27,801 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:27,802 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:28,005 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:28,026 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:28,026 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2018-11-07 22:18:28,026 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:28,026 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 22:18:28,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 22:18:28,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:18:28,027 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 12 states. [2018-11-07 22:18:28,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:28,392 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2018-11-07 22:18:28,393 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:18:28,393 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2018-11-07 22:18:28,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:28,394 INFO L225 Difference]: With dead ends: 50 [2018-11-07 22:18:28,394 INFO L226 Difference]: Without dead ends: 38 [2018-11-07 22:18:28,395 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:18:28,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-11-07 22:18:28,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2018-11-07 22:18:28,400 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 22:18:28,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-11-07 22:18:28,401 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 27 [2018-11-07 22:18:28,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:28,402 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-11-07 22:18:28,402 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 22:18:28,402 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-11-07 22:18:28,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:18:28,403 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:28,404 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:28,404 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:28,404 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:28,404 INFO L82 PathProgramCache]: Analyzing trace with hash 1459820948, now seen corresponding path program 3 times [2018-11-07 22:18:28,404 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:28,405 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:28,405 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:28,406 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:28,406 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:28,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:28,640 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:28,641 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:28,641 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:28,641 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:28,642 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:28,642 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:28,642 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 22:18:28,662 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:28,663 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:28,690 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:28,690 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:28,693 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:28,716 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 33 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:28,717 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:28,927 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 33 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:28,947 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:28,947 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 14 [2018-11-07 22:18:28,947 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:28,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:18:28,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:18:28,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=116, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:18:28,948 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2018-11-07 22:18:29,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:29,223 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-11-07 22:18:29,225 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:18:29,225 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-11-07 22:18:29,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:29,226 INFO L225 Difference]: With dead ends: 59 [2018-11-07 22:18:29,226 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:18:29,227 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=66, Invalid=116, Unknown=0, NotChecked=0, Total=182 [2018-11-07 22:18:29,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:18:29,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-11-07 22:18:29,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 22:18:29,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-07 22:18:29,233 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 35 [2018-11-07 22:18:29,233 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:29,233 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-07 22:18:29,234 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:18:29,234 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-07 22:18:29,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 22:18:29,235 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:29,235 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:29,235 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:29,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:29,236 INFO L82 PathProgramCache]: Analyzing trace with hash -149334940, now seen corresponding path program 4 times [2018-11-07 22:18:29,236 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:29,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:29,237 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:29,237 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:29,237 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:29,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:29,484 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 22:18:29,484 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:29,484 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:29,484 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:29,485 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:29,485 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:29,485 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 22:18:29,494 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:29,494 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:29,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:29,509 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:29,523 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 47 proven. 78 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:29,523 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:29,715 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 47 proven. 78 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:18:29,735 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:29,735 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 18 [2018-11-07 22:18:29,736 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:29,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 22:18:29,736 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 22:18:29,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:18:29,737 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 11 states. [2018-11-07 22:18:30,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:30,068 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-11-07 22:18:30,070 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:18:30,070 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2018-11-07 22:18:30,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:30,072 INFO L225 Difference]: With dead ends: 67 [2018-11-07 22:18:30,072 INFO L226 Difference]: Without dead ends: 54 [2018-11-07 22:18:30,074 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-11-07 22:18:30,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-07 22:18:30,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-11-07 22:18:30,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 22:18:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-11-07 22:18:30,080 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 43 [2018-11-07 22:18:30,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:30,081 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-11-07 22:18:30,081 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 22:18:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-11-07 22:18:30,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 22:18:30,082 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:30,082 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:30,083 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:30,083 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:30,083 INFO L82 PathProgramCache]: Analyzing trace with hash 435142452, now seen corresponding path program 5 times [2018-11-07 22:18:30,083 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:30,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:30,084 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:30,084 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:30,084 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:30,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:30,572 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 29 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:30,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:30,573 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:30,573 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:30,573 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:30,573 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:30,573 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 22:18:30,584 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:30,584 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:30,598 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:18:30,598 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:30,601 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:31,062 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-07 22:18:31,062 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:31,547 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-07 22:18:31,581 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:31,582 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 27 [2018-11-07 22:18:31,582 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:31,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 22:18:31,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 22:18:31,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:18:31,585 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 20 states. [2018-11-07 22:18:32,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:32,528 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2018-11-07 22:18:32,528 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 22:18:32,529 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2018-11-07 22:18:32,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:32,530 INFO L225 Difference]: With dead ends: 83 [2018-11-07 22:18:32,531 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 22:18:32,532 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=207, Invalid=1275, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 22:18:32,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 22:18:32,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2018-11-07 22:18:32,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-07 22:18:32,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2018-11-07 22:18:32,540 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 51 [2018-11-07 22:18:32,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:32,540 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2018-11-07 22:18:32,540 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 22:18:32,541 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2018-11-07 22:18:32,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-11-07 22:18:32,542 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:32,542 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:32,542 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:32,542 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:32,542 INFO L82 PathProgramCache]: Analyzing trace with hash -1361248850, now seen corresponding path program 6 times [2018-11-07 22:18:32,543 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:32,543 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:32,543 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:32,544 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:32,544 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:32,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:32,874 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 38 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:32,874 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:32,874 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:32,875 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:32,875 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:32,875 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:32,875 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 22:18:32,886 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:32,886 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:32,903 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:32,903 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:32,906 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:32,953 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 118 proven. 210 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 22:18:32,953 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:33,432 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 118 proven. 210 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 22:18:33,453 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:33,453 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 13] total 27 [2018-11-07 22:18:33,453 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:33,453 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 22:18:33,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 22:18:33,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=484, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:18:33,454 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 16 states. [2018-11-07 22:18:34,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:34,127 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2018-11-07 22:18:34,127 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 22:18:34,127 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2018-11-07 22:18:34,127 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:34,128 INFO L225 Difference]: With dead ends: 95 [2018-11-07 22:18:34,128 INFO L226 Difference]: Without dead ends: 78 [2018-11-07 22:18:34,129 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=218, Invalid=484, Unknown=0, NotChecked=0, Total=702 [2018-11-07 22:18:34,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-07 22:18:34,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-11-07 22:18:34,136 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 22:18:34,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2018-11-07 22:18:34,137 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 63 [2018-11-07 22:18:34,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:34,138 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2018-11-07 22:18:34,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 22:18:34,138 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2018-11-07 22:18:34,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-11-07 22:18:34,139 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:34,139 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:34,139 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:34,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:34,140 INFO L82 PathProgramCache]: Analyzing trace with hash -1880071194, now seen corresponding path program 7 times [2018-11-07 22:18:34,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:34,141 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:34,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:34,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:34,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:34,583 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 47 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:34,583 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:34,583 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:34,584 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:34,584 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:34,584 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:34,584 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 22:18:34,595 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:34,595 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:34,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:34,629 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:34,708 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 151 proven. 351 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 22:18:34,708 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:35,366 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 151 proven. 351 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 22:18:35,387 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:35,388 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 16] total 33 [2018-11-07 22:18:35,388 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:35,388 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:18:35,388 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:18:35,389 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=739, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:18:35,389 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand 19 states. [2018-11-07 22:18:36,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:36,136 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2018-11-07 22:18:36,136 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 22:18:36,137 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-11-07 22:18:36,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:36,138 INFO L225 Difference]: With dead ends: 107 [2018-11-07 22:18:36,138 INFO L226 Difference]: Without dead ends: 90 [2018-11-07 22:18:36,139 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=317, Invalid=739, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 22:18:36,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-07 22:18:36,149 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-11-07 22:18:36,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 22:18:36,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2018-11-07 22:18:36,154 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 75 [2018-11-07 22:18:36,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:36,157 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2018-11-07 22:18:36,157 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:18:36,157 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2018-11-07 22:18:36,158 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 22:18:36,158 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:36,158 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:36,158 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:36,159 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:36,159 INFO L82 PathProgramCache]: Analyzing trace with hash -842779106, now seen corresponding path program 8 times [2018-11-07 22:18:36,159 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:36,159 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:36,160 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:36,162 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:36,162 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:36,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:36,801 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 56 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:36,801 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:36,801 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:36,801 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:36,801 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:36,802 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:36,802 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 22:18:36,812 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:36,812 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:18:36,828 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:18:36,829 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:36,835 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:37,099 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 194 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2018-11-07 22:18:37,099 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:37,649 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 194 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2018-11-07 22:18:37,669 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:37,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9, 9] total 36 [2018-11-07 22:18:37,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:37,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:18:37,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:18:37,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1153, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:18:37,671 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand 29 states. [2018-11-07 22:18:40,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:40,311 INFO L93 Difference]: Finished difference Result 126 states and 138 transitions. [2018-11-07 22:18:40,311 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:18:40,311 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 87 [2018-11-07 22:18:40,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:40,313 INFO L225 Difference]: With dead ends: 126 [2018-11-07 22:18:40,313 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 22:18:40,315 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 161 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=312, Invalid=2880, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 22:18:40,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 22:18:40,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-11-07 22:18:40,322 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-11-07 22:18:40,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2018-11-07 22:18:40,323 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 87 [2018-11-07 22:18:40,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:40,324 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2018-11-07 22:18:40,324 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:18:40,324 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2018-11-07 22:18:40,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-07 22:18:40,325 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:40,326 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 19, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:40,326 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:40,326 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:40,326 INFO L82 PathProgramCache]: Analyzing trace with hash 2089000704, now seen corresponding path program 9 times [2018-11-07 22:18:40,326 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:40,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:40,327 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:40,327 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:40,327 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:40,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 68 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:41,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:41,027 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:41,027 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:41,027 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:41,027 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:41,027 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 22:18:41,036 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:18:41,036 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:18:41,082 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:18:41,082 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:18:41,085 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:41,160 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 296 proven. 741 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:41,160 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:42,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 296 proven. 741 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:42,157 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:42,157 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 22] total 46 [2018-11-07 22:18:42,157 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:42,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 22:18:42,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 22:18:42,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=592, Invalid=1478, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:18:42,159 INFO L87 Difference]: Start difference. First operand 105 states and 110 transitions. Second operand 26 states. [2018-11-07 22:18:43,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:43,220 INFO L93 Difference]: Finished difference Result 143 states and 156 transitions. [2018-11-07 22:18:43,220 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 22:18:43,220 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2018-11-07 22:18:43,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:43,222 INFO L225 Difference]: With dead ends: 143 [2018-11-07 22:18:43,222 INFO L226 Difference]: Without dead ends: 122 [2018-11-07 22:18:43,224 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=592, Invalid=1478, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:18:43,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-11-07 22:18:43,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2018-11-07 22:18:43,231 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-11-07 22:18:43,232 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2018-11-07 22:18:43,232 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 103 [2018-11-07 22:18:43,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:43,233 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2018-11-07 22:18:43,233 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 22:18:43,233 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2018-11-07 22:18:43,234 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 22:18:43,234 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:43,234 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:43,234 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:43,235 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:43,235 INFO L82 PathProgramCache]: Analyzing trace with hash -303598432, now seen corresponding path program 10 times [2018-11-07 22:18:43,235 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:43,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:43,236 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:18:43,236 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:43,236 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:43,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:44,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 80 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:44,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:44,080 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:44,080 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:44,080 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:44,080 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:44,080 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 22:18:44,090 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:44,090 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:18:44,123 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:44,126 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:18:44,155 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 1081 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:44,156 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:18:46,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 1081 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 22:18:46,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:18:46,261 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 26, 26] total 54 [2018-11-07 22:18:46,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:18:46,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 22:18:46,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 22:18:46,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=804, Invalid=2058, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 22:18:46,264 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 30 states. [2018-11-07 22:18:47,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:18:47,724 INFO L93 Difference]: Finished difference Result 159 states and 172 transitions. [2018-11-07 22:18:47,725 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 22:18:47,725 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 119 [2018-11-07 22:18:47,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:18:47,726 INFO L225 Difference]: With dead ends: 159 [2018-11-07 22:18:47,726 INFO L226 Difference]: Without dead ends: 138 [2018-11-07 22:18:47,727 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 214 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=804, Invalid=2058, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 22:18:47,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-07 22:18:47,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-11-07 22:18:47,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 22:18:47,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 142 transitions. [2018-11-07 22:18:47,736 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 142 transitions. Word has length 119 [2018-11-07 22:18:47,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:18:47,736 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 142 transitions. [2018-11-07 22:18:47,736 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 22:18:47,736 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 142 transitions. [2018-11-07 22:18:47,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-11-07 22:18:47,738 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:18:47,738 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 27, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:18:47,738 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:18:47,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:18:47,739 INFO L82 PathProgramCache]: Analyzing trace with hash -114554304, now seen corresponding path program 11 times [2018-11-07 22:18:47,739 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:18:47,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:47,740 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:18:47,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:18:47,740 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:18:47,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:18:49,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 92 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:18:49,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:49,097 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:18:49,097 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:18:49,097 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:18:49,097 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:18:49,097 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 22:18:49,105 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:18:49,106 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:19:36,907 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 22:19:36,907 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:19:37,140 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:19:38,078 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 437 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2018-11-07 22:19:38,079 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:09,209 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 437 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2018-11-07 22:20:09,215 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:09,216 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 13, 13] total 56 [2018-11-07 22:20:09,216 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:09,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 22:20:09,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 22:20:09,218 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=2853, Unknown=11, NotChecked=0, Total=3080 [2018-11-07 22:20:09,219 INFO L87 Difference]: Start difference. First operand 137 states and 142 transitions. Second operand 45 states. [2018-11-07 22:20:15,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:15,121 INFO L93 Difference]: Finished difference Result 193 states and 210 transitions. [2018-11-07 22:20:15,121 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 22:20:15,121 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 135 [2018-11-07 22:20:15,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:15,125 INFO L225 Difference]: With dead ends: 193 [2018-11-07 22:20:15,125 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 22:20:15,128 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 34.7s TimeCoverageRelationStatistics Valid=670, Invalid=7151, Unknown=11, NotChecked=0, Total=7832 [2018-11-07 22:20:15,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 22:20:15,135 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 164. [2018-11-07 22:20:15,135 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-11-07 22:20:15,136 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 171 transitions. [2018-11-07 22:20:15,136 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 171 transitions. Word has length 135 [2018-11-07 22:20:15,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:15,137 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 171 transitions. [2018-11-07 22:20:15,137 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 22:20:15,137 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 171 transitions. [2018-11-07 22:20:15,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-11-07 22:20:15,139 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:15,139 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 31, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:15,139 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:15,139 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:15,139 INFO L82 PathProgramCache]: Analyzing trace with hash -1133922934, now seen corresponding path program 12 times [2018-11-07 22:20:15,140 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:15,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:15,140 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:20:15,140 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:15,141 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:15,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:16,062 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 107 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:20:16,062 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:16,063 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:16,063 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:16,063 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:16,063 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:16,063 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 22:20:16,073 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:20:16,073 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:20:16,114 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:20:16,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:20:16,118 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:16,188 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 603 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:20:16,188 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:18,536 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 603 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:20:18,556 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:18,556 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 34, 34] total 71 [2018-11-07 22:20:18,556 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:18,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 22:20:18,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 22:20:18,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=3611, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 22:20:18,559 INFO L87 Difference]: Start difference. First operand 164 states and 171 transitions. Second operand 39 states. [2018-11-07 22:20:21,094 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:21,094 INFO L93 Difference]: Finished difference Result 217 states and 235 transitions. [2018-11-07 22:20:21,094 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 22:20:21,095 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 155 [2018-11-07 22:20:21,095 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:21,096 INFO L225 Difference]: With dead ends: 217 [2018-11-07 22:20:21,096 INFO L226 Difference]: Without dead ends: 185 [2018-11-07 22:20:21,098 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 278 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=1359, Invalid=3611, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 22:20:21,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-11-07 22:20:21,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2018-11-07 22:20:21,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-11-07 22:20:21,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 191 transitions. [2018-11-07 22:20:21,105 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 191 transitions. Word has length 155 [2018-11-07 22:20:21,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:21,106 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 191 transitions. [2018-11-07 22:20:21,106 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 22:20:21,106 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 191 transitions. [2018-11-07 22:20:21,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-11-07 22:20:21,107 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:21,107 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 36, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:21,108 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:21,108 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:21,108 INFO L82 PathProgramCache]: Analyzing trace with hash -718034286, now seen corresponding path program 13 times [2018-11-07 22:20:21,108 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:21,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:21,109 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:20:21,109 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:21,109 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:21,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:22,418 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 22:20:22,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:22,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:22,418 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:22,418 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:22,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:22,418 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:20:22,427 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:22,427 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:20:22,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:22,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:20:22,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 2628 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:20:22,566 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:20:25,997 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 2628 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:20:26,016 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:20:26,016 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 39, 39] total 81 [2018-11-07 22:20:26,016 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:20:26,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 22:20:26,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 22:20:26,019 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1754, Invalid=4726, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:20:26,019 INFO L87 Difference]: Start difference. First operand 184 states and 191 transitions. Second operand 44 states. [2018-11-07 22:20:29,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:20:29,242 INFO L93 Difference]: Finished difference Result 237 states and 255 transitions. [2018-11-07 22:20:29,243 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 22:20:29,243 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 175 [2018-11-07 22:20:29,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:20:29,245 INFO L225 Difference]: With dead ends: 237 [2018-11-07 22:20:29,245 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 22:20:29,249 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 313 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1754, Invalid=4726, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 22:20:29,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 22:20:29,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-11-07 22:20:29,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-11-07 22:20:29,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 211 transitions. [2018-11-07 22:20:29,256 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 211 transitions. Word has length 175 [2018-11-07 22:20:29,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:20:29,257 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 211 transitions. [2018-11-07 22:20:29,257 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 22:20:29,257 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 211 transitions. [2018-11-07 22:20:29,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-07 22:20:29,258 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:20:29,258 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 41, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:20:29,259 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:20:29,259 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:20:29,259 INFO L82 PathProgramCache]: Analyzing trace with hash 2000210842, now seen corresponding path program 14 times [2018-11-07 22:20:29,259 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:20:29,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:29,260 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:20:29,260 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:20:29,260 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:20:29,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:20:31,435 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 137 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:20:31,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:31,435 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:20:31,435 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:20:31,435 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:20:31,435 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:20:31,436 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 22:20:31,444 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:20:31,444 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:21:26,537 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:21:26,537 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:21:27,089 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:27,586 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 829 refuted. 0 times theorem prover too weak. 3403 trivial. 0 not checked. [2018-11-07 22:21:27,586 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:28,958 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 829 refuted. 0 times theorem prover too weak. 3403 trivial. 0 not checked. [2018-11-07 22:21:28,995 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:28,995 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 11, 11] total 67 [2018-11-07 22:21:28,996 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:28,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 22:21:28,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 22:21:28,998 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=4206, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 22:21:28,998 INFO L87 Difference]: Start difference. First operand 204 states and 211 transitions. Second operand 58 states. [2018-11-07 22:21:36,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:21:36,833 INFO L93 Difference]: Finished difference Result 269 states and 291 transitions. [2018-11-07 22:21:36,833 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 22:21:36,834 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 195 [2018-11-07 22:21:36,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:21:36,837 INFO L225 Difference]: With dead ends: 269 [2018-11-07 22:21:36,837 INFO L226 Difference]: Without dead ends: 234 [2018-11-07 22:21:36,839 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 373 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1167 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=785, Invalid=12325, Unknown=0, NotChecked=0, Total=13110 [2018-11-07 22:21:36,840 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-11-07 22:21:36,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2018-11-07 22:21:36,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 22:21:36,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 242 transitions. [2018-11-07 22:21:36,848 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 242 transitions. Word has length 195 [2018-11-07 22:21:36,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:21:36,848 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 242 transitions. [2018-11-07 22:21:36,848 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 22:21:36,849 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 242 transitions. [2018-11-07 22:21:36,850 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-11-07 22:21:36,850 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:21:36,850 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 47, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:21:36,850 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:21:36,850 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:21:36,851 INFO L82 PathProgramCache]: Analyzing trace with hash -789745056, now seen corresponding path program 15 times [2018-11-07 22:21:36,851 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:21:36,851 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:36,851 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:21:36,852 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:36,852 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:21:36,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:38,315 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 348 proven. 4851 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:21:38,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:38,316 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:21:38,316 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:21:38,316 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:21:38,316 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:38,316 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 22:21:38,324 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:21:38,324 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:21:38,368 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:21:38,369 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:21:38,372 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:38,443 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 888 proven. 4278 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:21:38,443 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 888 proven. 4278 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:21:43,187 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:43,187 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 49, 49] total 100 [2018-11-07 22:21:43,187 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:43,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 22:21:43,188 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 22:21:43,189 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2644, Invalid=7256, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:21:43,189 INFO L87 Difference]: Start difference. First operand 232 states and 242 transitions. Second operand 53 states. [2018-11-07 22:21:47,706 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:21:47,707 INFO L93 Difference]: Finished difference Result 289 states and 312 transitions. [2018-11-07 22:21:47,707 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 22:21:47,707 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 215 [2018-11-07 22:21:47,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:21:47,709 INFO L225 Difference]: With dead ends: 289 [2018-11-07 22:21:47,709 INFO L226 Difference]: Without dead ends: 249 [2018-11-07 22:21:47,711 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 383 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=2644, Invalid=7256, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 22:21:47,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-11-07 22:21:47,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 248. [2018-11-07 22:21:47,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-11-07 22:21:47,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 258 transitions. [2018-11-07 22:21:47,719 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 258 transitions. Word has length 215 [2018-11-07 22:21:47,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:21:47,720 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 258 transitions. [2018-11-07 22:21:47,720 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 22:21:47,720 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 258 transitions. [2018-11-07 22:21:47,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-07 22:21:47,721 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:21:47,722 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 51, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:21:47,722 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:21:47,722 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:21:47,722 INFO L82 PathProgramCache]: Analyzing trace with hash 536250368, now seen corresponding path program 16 times [2018-11-07 22:21:47,722 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:21:47,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:47,723 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:21:47,723 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:21:47,723 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:21:47,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:49,380 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 376 proven. 5671 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:21:49,380 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:49,380 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:21:49,381 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:21:49,381 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:21:49,381 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:21:49,381 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 22:21:49,390 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:21:49,390 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:21:49,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:21:49,440 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:21:49,577 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 964 proven. 5050 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:21:49,577 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:21:55,357 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 964 proven. 5050 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:21:55,376 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:21:55,376 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 53, 53] total 108 [2018-11-07 22:21:55,377 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:21:55,377 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 22:21:55,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 22:21:55,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3072, Invalid=8484, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:21:55,378 INFO L87 Difference]: Start difference. First operand 248 states and 258 transitions. Second operand 57 states. [2018-11-07 22:22:00,637 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:22:00,637 INFO L93 Difference]: Finished difference Result 305 states and 328 transitions. [2018-11-07 22:22:00,638 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-11-07 22:22:00,638 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 231 [2018-11-07 22:22:00,638 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:22:00,639 INFO L225 Difference]: With dead ends: 305 [2018-11-07 22:22:00,639 INFO L226 Difference]: Without dead ends: 265 [2018-11-07 22:22:00,640 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 411 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=3072, Invalid=8484, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 22:22:00,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-11-07 22:22:00,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 264. [2018-11-07 22:22:00,647 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2018-11-07 22:22:00,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 274 transitions. [2018-11-07 22:22:00,649 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 274 transitions. Word has length 231 [2018-11-07 22:22:00,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:22:00,649 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 274 transitions. [2018-11-07 22:22:00,649 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 22:22:00,649 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 274 transitions. [2018-11-07 22:22:00,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 22:22:00,651 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:22:00,651 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 55, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:22:00,651 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:22:00,651 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:22:00,651 INFO L82 PathProgramCache]: Analyzing trace with hash -1772069472, now seen corresponding path program 17 times [2018-11-07 22:22:00,652 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:22:00,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:00,652 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:22:00,652 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:00,652 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:22:00,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:22:02,710 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 404 proven. 6555 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:22:02,710 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:02,710 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:22:02,710 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:22:02,710 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:22:02,711 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:02,711 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 22:22:02,728 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:22:02,728 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:22:02,767 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:22:02,767 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:22:02,771 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:22:03,634 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 176 proven. 0 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-11-07 22:22:03,634 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:22:06,436 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-11-07 22:22:06,469 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-11-07 22:22:06,469 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [61, 5] total 67 [2018-11-07 22:22:06,469 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:22:06,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 22:22:06,470 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 22:22:06,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=4223, Unknown=1, NotChecked=0, Total=4422 [2018-11-07 22:22:06,471 INFO L87 Difference]: Start difference. First operand 264 states and 274 transitions. Second operand 5 states. [2018-11-07 22:22:06,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:22:06,607 INFO L93 Difference]: Finished difference Result 299 states and 315 transitions. [2018-11-07 22:22:06,607 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 22:22:06,607 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 247 [2018-11-07 22:22:06,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:22:06,610 INFO L225 Difference]: With dead ends: 299 [2018-11-07 22:22:06,610 INFO L226 Difference]: Without dead ends: 294 [2018-11-07 22:22:06,611 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 489 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=206, Invalid=4349, Unknown=1, NotChecked=0, Total=4556 [2018-11-07 22:22:06,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-11-07 22:22:06,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 263. [2018-11-07 22:22:06,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2018-11-07 22:22:06,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 272 transitions. [2018-11-07 22:22:06,620 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 272 transitions. Word has length 247 [2018-11-07 22:22:06,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:22:06,621 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 272 transitions. [2018-11-07 22:22:06,621 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 22:22:06,621 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 272 transitions. [2018-11-07 22:22:06,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 22:22:06,622 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:22:06,623 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 55, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:22:06,623 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:22:06,623 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:22:06,623 INFO L82 PathProgramCache]: Analyzing trace with hash -704557408, now seen corresponding path program 18 times [2018-11-07 22:22:06,623 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:22:06,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:06,624 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:22:06,624 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:06,624 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:22:06,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:22:08,740 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 176 proven. 6786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:22:08,740 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:08,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:22:08,741 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:22:08,741 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:22:08,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:08,741 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:22:08,750 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:22:08,750 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:22:08,797 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:22:08,797 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:22:08,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:22:08,905 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1040 proven. 5886 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:22:08,905 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:22:15,117 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1040 proven. 5886 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:22:15,138 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:22:15,138 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 57, 57] total 117 [2018-11-07 22:22:15,138 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:22:15,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-11-07 22:22:15,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-11-07 22:22:15,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3590, Invalid=9982, Unknown=0, NotChecked=0, Total=13572 [2018-11-07 22:22:15,140 INFO L87 Difference]: Start difference. First operand 263 states and 272 transitions. Second operand 62 states. [2018-11-07 22:22:21,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:22:21,549 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2018-11-07 22:22:21,553 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 22:22:21,553 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 247 [2018-11-07 22:22:21,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:22:21,554 INFO L225 Difference]: With dead ends: 323 [2018-11-07 22:22:21,555 INFO L226 Difference]: Without dead ends: 284 [2018-11-07 22:22:21,555 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 439 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.0s TimeCoverageRelationStatistics Valid=3590, Invalid=9982, Unknown=0, NotChecked=0, Total=13572 [2018-11-07 22:22:21,556 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2018-11-07 22:22:21,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2018-11-07 22:22:21,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2018-11-07 22:22:21,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 292 transitions. [2018-11-07 22:22:21,565 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 292 transitions. Word has length 247 [2018-11-07 22:22:21,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:22:21,566 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 292 transitions. [2018-11-07 22:22:21,566 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-11-07 22:22:21,566 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 292 transitions. [2018-11-07 22:22:21,567 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2018-11-07 22:22:21,567 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:22:21,567 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 60, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:22:21,568 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:22:21,568 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:22:21,568 INFO L82 PathProgramCache]: Analyzing trace with hash -1137924184, now seen corresponding path program 19 times [2018-11-07 22:22:21,568 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:22:21,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:21,569 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:22:21,569 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:21,569 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:22:21,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:22:24,569 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 191 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:22:24,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:24,569 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:22:24,569 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:22:24,569 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:22:24,569 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:24,570 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:22:24,578 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:22:24,578 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:22:24,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:22:24,630 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:22:24,793 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 1135 proven. 7021 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:22:24,794 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:22:32,379 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 1135 proven. 7021 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 22:22:32,399 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:22:32,399 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 62, 62] total 127 [2018-11-07 22:22:32,399 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:22:32,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 22:22:32,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 22:22:32,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4215, Invalid=11787, Unknown=0, NotChecked=0, Total=16002 [2018-11-07 22:22:32,401 INFO L87 Difference]: Start difference. First operand 283 states and 292 transitions. Second operand 67 states. [2018-11-07 22:22:41,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:22:41,118 INFO L93 Difference]: Finished difference Result 343 states and 365 transitions. [2018-11-07 22:22:41,122 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-11-07 22:22:41,122 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 267 [2018-11-07 22:22:41,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:22:41,124 INFO L225 Difference]: With dead ends: 343 [2018-11-07 22:22:41,124 INFO L226 Difference]: Without dead ends: 304 [2018-11-07 22:22:41,125 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 474 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 10.2s TimeCoverageRelationStatistics Valid=4215, Invalid=11787, Unknown=0, NotChecked=0, Total=16002 [2018-11-07 22:22:41,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2018-11-07 22:22:41,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 303. [2018-11-07 22:22:41,133 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-11-07 22:22:41,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 312 transitions. [2018-11-07 22:22:41,137 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 312 transitions. Word has length 267 [2018-11-07 22:22:41,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:22:41,138 INFO L480 AbstractCegarLoop]: Abstraction has 303 states and 312 transitions. [2018-11-07 22:22:41,138 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 22:22:41,138 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 312 transitions. [2018-11-07 22:22:41,140 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2018-11-07 22:22:41,140 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:22:41,140 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 65, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:22:41,140 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:22:41,140 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:22:41,141 INFO L82 PathProgramCache]: Analyzing trace with hash 1895378096, now seen corresponding path program 20 times [2018-11-07 22:22:41,141 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:22:41,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:41,141 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:22:41,141 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:22:41,142 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:22:41,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:22:43,934 INFO L134 CoverageAnalysis]: Checked inductivity of 9522 backedges. 206 proven. 9316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:22:43,934 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:43,935 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:22:43,935 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:22:43,935 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:22:43,935 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:22:43,935 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 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:22:43,943 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:22:43,943 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:22:43,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:22:43,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:22:44,001 INFO L273 TraceCheckSpWp]: Computing forward predicates... Received shutdown request... [2018-11-07 22:22:44,308 INFO L177 TraceCheckSpWp]: Timeout while computing interpolants [2018-11-07 22:22:44,508 WARN L521 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 22:22:44,509 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:22:44,514 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:22:44,514 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:22:44 BoogieIcfgContainer [2018-11-07 22:22:44,514 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:22:44,515 INFO L168 Benchmark]: Toolchain (without parser) took 261836.51 ms. Allocated memory was 1.6 GB in the beginning and 2.5 GB in the end (delta: 893.4 MB). Free memory was 1.5 GB in the beginning and 2.1 GB in the end (delta: -695.0 MB). Peak memory consumption was 198.3 MB. Max. memory is 7.1 GB. [2018-11-07 22:22:44,517 INFO L168 Benchmark]: CDTParser took 0.28 ms. Allocated memory is still 1.6 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:22:44,517 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.31 ms. Allocated memory is still 1.6 GB. Free memory was 1.5 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 22:22:44,518 INFO L168 Benchmark]: Boogie Procedure Inliner took 23.37 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:22:44,518 INFO L168 Benchmark]: Boogie Preprocessor took 35.62 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:22:44,519 INFO L168 Benchmark]: RCFGBuilder took 436.68 ms. Allocated memory was 1.6 GB in the beginning and 2.4 GB in the end (delta: 806.9 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -851.1 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. [2018-11-07 22:22:44,520 INFO L168 Benchmark]: TraceAbstraction took 261070.96 ms. Allocated memory was 2.4 GB in the beginning and 2.5 GB in the end (delta: 86.5 MB). Free memory was 2.3 GB in the beginning and 2.1 GB in the end (delta: 145.4 MB). Peak memory consumption was 232.0 MB. Max. memory is 7.1 GB. [2018-11-07 22:22:44,523 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28 ms. Allocated memory is still 1.6 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 265.31 ms. Allocated memory is still 1.6 GB. Free memory was 1.5 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 23.37 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 35.62 ms. Allocated memory is still 1.6 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 436.68 ms. Allocated memory was 1.6 GB in the beginning and 2.4 GB in the end (delta: 806.9 MB). Free memory was 1.4 GB in the beginning and 2.3 GB in the end (delta: -851.1 MB). Peak memory consumption was 26.5 MB. Max. memory is 7.1 GB. * TraceAbstraction took 261070.96 ms. Allocated memory was 2.4 GB in the beginning and 2.5 GB in the end (delta: 86.5 MB). Free memory was 2.3 GB in the beginning and 2.1 GB in the end (delta: 145.4 MB). Peak memory consumption was 232.0 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 2]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 2). Cancelled while BasicCegarLoop was analyzing trace of length 288 with TraceHistMax 70,while TraceCheckSpWp was constructing forward predicates,while PredicateComparison was comparing new predicate (quantifier-free) to 74 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 260.9s OverallTime, 24 OverallIterations, 70 TraceHistogramMax, 54.1s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 801 SDtfs, 1579 SDslu, 26447 SDs, 0 SdLazy, 70621 SolverSat, 515 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 40.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5819 GetRequests, 4604 SyntacticMatches, 33 SemanticMatches, 1182 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2196 ImplicationChecksByTransitivity, 97.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=303occurred in iteration=23, 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: 0.1s AutomataMinimizationTime, 23 MinimizatonAttempts, 57 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 103.7s SatisfiabilityAnalysisTime, 97.1s InterpolantComputationTime, 5075 NumberOfCodeBlocks, 4483 NumberOfCodeBlocksAsserted, 73 NumberOfCheckSat, 7537 ConstructedInterpolants, 684 QuantifiedInterpolants, 9866495 SizeOfPredicates, 44 NumberOfNonLiveVariables, 2817 ConjunctsInSsa, 863 ConjunctsInUnsatCore, 65 InterpolantComputations, 5 PerfectInterpolantSequences, 40491/150072 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown