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/loop-acceleration/phases_false-unreach-call1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 22:05:49,651 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 22:05:49,653 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 22:05:49,668 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 22:05:49,669 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 22:05:49,671 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 22:05:49,672 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 22:05:49,682 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 22:05:49,687 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 22:05:49,688 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 22:05:49,696 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 22:05:49,696 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 22:05:49,697 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 22:05:49,698 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 22:05:49,699 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 22:05:49,702 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 22:05:49,703 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 22:05:49,706 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 22:05:49,711 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 22:05:49,713 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 22:05:49,717 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 22:05:49,718 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 22:05:49,721 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 22:05:49,721 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 22:05:49,722 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 22:05:49,722 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 22:05:49,724 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 22:05:49,725 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 22:05:49,725 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 22:05:49,728 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 22:05:49,728 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 22:05:49,730 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... 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[2018-11-07 22:05:49,733 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 22:05:49,760 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 22:05:49,760 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 22:05:49,762 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 22:05:49,762 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 22:05:49,762 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 22:05:49,762 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 22:05:49,762 INFO L133 SettingsManager]: * Maximum recursion depth of evaluation operations=6 [2018-11-07 22:05:49,763 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 22:05:49,763 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 22:05:49,763 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 22:05:49,764 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 22:05:49,764 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 22:05:49,764 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 22:05:49,765 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 22:05:49,765 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 22:05:49,766 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 22:05:49,767 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 22:05:49,767 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 22:05:49,767 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 22:05:49,767 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 22:05:49,767 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 22:05:49,769 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 22:05:49,770 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 22:05:49,771 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 22:05:49,771 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 22:05:49,837 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 22:05:49,850 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 22:05:49,855 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 22:05:49,857 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 22:05:49,857 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 22:05:49,858 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-11-07 22:05:49,917 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd3d05b49/e1e2402b9a264e37b9862751a51a370c/FLAGe70615d68 [2018-11-07 22:05:50,369 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 22:05:50,370 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/phases_false-unreach-call1.i [2018-11-07 22:05:50,375 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd3d05b49/e1e2402b9a264e37b9862751a51a370c/FLAGe70615d68 [2018-11-07 22:05:50,388 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd3d05b49/e1e2402b9a264e37b9862751a51a370c [2018-11-07 22:05:50,400 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 22:05:50,402 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 22:05:50,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 22:05:50,403 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 22:05:50,407 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 22:05:50,408 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,411 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@aa6eb5f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50, skipping insertion in model container [2018-11-07 22:05:50,411 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,421 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 22:05:50,446 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 22:05:50,636 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:05:50,640 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 22:05:50,659 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 22:05:50,676 INFO L193 MainTranslator]: Completed translation [2018-11-07 22:05:50,676 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50 WrapperNode [2018-11-07 22:05:50,676 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 22:05:50,677 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 22:05:50,677 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 22:05:50,678 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 22:05:50,687 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,695 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,701 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 22:05:50,702 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 22:05:50,702 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 22:05:50,702 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 22:05:50,712 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,712 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,713 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,713 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,716 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,720 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,721 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (1/1) ... [2018-11-07 22:05:50,722 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 22:05:50,723 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 22:05:50,723 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 22:05:50,723 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 22:05:50,724 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (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 22:05:50,850 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 22:05:50,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 22:05:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 22:05:50,851 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 22:05:50,851 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 22:05:50,851 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 22:05:50,852 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 22:05:50,852 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 22:05:51,069 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 22:05:51,070 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:05:51 BoogieIcfgContainer [2018-11-07 22:05:51,070 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 22:05:51,071 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 22:05:51,071 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 22:05:51,074 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 22:05:51,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 10:05:50" (1/3) ... [2018-11-07 22:05:51,077 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28fa2a5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:05:51, skipping insertion in model container [2018-11-07 22:05:51,078 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 10:05:50" (2/3) ... [2018-11-07 22:05:51,081 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28fa2a5c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 10:05:51, skipping insertion in model container [2018-11-07 22:05:51,081 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 10:05:51" (3/3) ... [2018-11-07 22:05:51,083 INFO L112 eAbstractionObserver]: Analyzing ICFG phases_false-unreach-call1.i [2018-11-07 22:05:51,092 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 22:05:51,099 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 22:05:51,116 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 22:05:51,149 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 22:05:51,149 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 22:05:51,150 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 22:05:51,150 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 22:05:51,150 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 22:05:51,150 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 22:05:51,150 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 22:05:51,151 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 22:05:51,169 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2018-11-07 22:05:51,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 22:05:51,175 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:51,176 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:51,178 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:51,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:51,184 INFO L82 PathProgramCache]: Analyzing trace with hash 1713253442, now seen corresponding path program 1 times [2018-11-07 22:05:51,187 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:51,232 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,233 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:51,233 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,233 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:51,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:51,290 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 22:05:51,292 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:05:51,293 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 22:05:51,293 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:05:51,297 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 22:05:51,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 22:05:51,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 22:05:51,313 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 2 states. [2018-11-07 22:05:51,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:51,336 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2018-11-07 22:05:51,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 22:05:51,337 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 22:05:51,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:51,346 INFO L225 Difference]: With dead ends: 30 [2018-11-07 22:05:51,346 INFO L226 Difference]: Without dead ends: 13 [2018-11-07 22:05:51,350 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 22:05:51,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2018-11-07 22:05:51,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2018-11-07 22:05:51,385 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2018-11-07 22:05:51,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2018-11-07 22:05:51,388 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2018-11-07 22:05:51,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:51,388 INFO L480 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2018-11-07 22:05:51,389 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 22:05:51,389 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2018-11-07 22:05:51,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 22:05:51,390 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:51,390 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:51,390 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:51,391 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:51,391 INFO L82 PathProgramCache]: Analyzing trace with hash 1144102878, now seen corresponding path program 1 times [2018-11-07 22:05:51,391 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:51,392 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,392 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:51,393 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,393 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:51,418 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:51,577 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 22:05:51,578 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 22:05:51,578 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2018-11-07 22:05:51,579 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:05:51,581 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:05:51,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:05:51,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:05:51,582 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 3 states. [2018-11-07 22:05:51,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:51,685 INFO L93 Difference]: Finished difference Result 24 states and 28 transitions. [2018-11-07 22:05:51,686 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:05:51,686 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 11 [2018-11-07 22:05:51,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:51,687 INFO L225 Difference]: With dead ends: 24 [2018-11-07 22:05:51,687 INFO L226 Difference]: Without dead ends: 16 [2018-11-07 22:05:51,688 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2018-11-07 22:05:51,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2018-11-07 22:05:51,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2018-11-07 22:05:51,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2018-11-07 22:05:51,693 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2018-11-07 22:05:51,693 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 11 [2018-11-07 22:05:51,693 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:51,693 INFO L480 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2018-11-07 22:05:51,694 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:05:51,694 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2018-11-07 22:05:51,694 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2018-11-07 22:05:51,695 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:51,695 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:51,695 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:51,695 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:51,696 INFO L82 PathProgramCache]: Analyzing trace with hash -2056921797, now seen corresponding path program 1 times [2018-11-07 22:05:51,696 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:51,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,697 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:51,697 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:51,697 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:51,709 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:51,910 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 22:05:51,911 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:51,911 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:51,912 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 15 with the following transitions: [2018-11-07 22:05:51,914 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:05:51,942 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:05:51,943 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:05:52,032 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:05:52,234 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:05:52,237 INFO L272 AbstractInterpreter]: Visited 13 different actions 69 times. Merged at 4 different actions 30 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 2 variables. [2018-11-07 22:05:52,280 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:52,281 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:05:52,282 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:52,282 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 22:05:52,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:52,302 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:52,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:52,344 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:52,376 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 22:05:52,377 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:52,489 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 22:05:52,512 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:52,512 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2018-11-07 22:05:52,513 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:52,514 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2018-11-07 22:05:52,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2018-11-07 22:05:52,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:05:52,515 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand 4 states. [2018-11-07 22:05:52,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:52,629 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 22:05:52,630 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 22:05:52,630 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 14 [2018-11-07 22:05:52,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:52,631 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:05:52,631 INFO L226 Difference]: Without dead ends: 19 [2018-11-07 22:05:52,632 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 2 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2018-11-07 22:05:52,632 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2018-11-07 22:05:52,635 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2018-11-07 22:05:52,636 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2018-11-07 22:05:52,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2018-11-07 22:05:52,637 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 14 [2018-11-07 22:05:52,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:52,637 INFO L480 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2018-11-07 22:05:52,638 INFO L481 AbstractCegarLoop]: Interpolant automaton has 4 states. [2018-11-07 22:05:52,638 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2018-11-07 22:05:52,638 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2018-11-07 22:05:52,639 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:52,639 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:52,639 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:52,639 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:52,639 INFO L82 PathProgramCache]: Analyzing trace with hash 1670825662, now seen corresponding path program 2 times [2018-11-07 22:05:52,640 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:52,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,641 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:52,641 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:52,641 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:52,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:52,841 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:52,841 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:52,842 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:52,842 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:52,842 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:52,842 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:52,843 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 22:05:52,861 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:52,861 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:05:52,874 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 22:05:52,874 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:52,876 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:52,944 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:05:52,944 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:53,118 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 22:05:53,141 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 22:05:53,141 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2018-11-07 22:05:53,141 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 22:05:53,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2018-11-07 22:05:53,142 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2018-11-07 22:05:53,142 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:05:53,143 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand 3 states. [2018-11-07 22:05:53,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:53,172 INFO L93 Difference]: Finished difference Result 27 states and 29 transitions. [2018-11-07 22:05:53,172 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 22:05:53,172 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2018-11-07 22:05:53,172 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:53,173 INFO L225 Difference]: With dead ends: 27 [2018-11-07 22:05:53,173 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 22:05:53,175 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2018-11-07 22:05:53,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 22:05:53,178 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 22:05:53,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 22:05:53,180 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 22:05:53,180 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 17 [2018-11-07 22:05:53,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:53,181 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 22:05:53,181 INFO L481 AbstractCegarLoop]: Interpolant automaton has 3 states. [2018-11-07 22:05:53,181 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 22:05:53,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2018-11-07 22:05:53,182 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:53,182 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:53,183 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:53,183 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:53,183 INFO L82 PathProgramCache]: Analyzing trace with hash 1801011421, now seen corresponding path program 1 times [2018-11-07 22:05:53,183 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:53,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:53,184 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:53,184 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:53,184 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:53,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:53,325 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,326 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,326 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:53,326 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 21 with the following transitions: [2018-11-07 22:05:53,327 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [26], [29], [31], [37], [38], [39], [41] [2018-11-07 22:05:53,328 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 22:05:53,328 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 22:05:53,332 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 22:05:53,425 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 22:05:53,425 INFO L272 AbstractInterpreter]: Visited 14 different actions 87 times. Merged at 5 different actions 34 times. Widened at 2 different actions 4 times. Found 9 fixpoints after 2 different actions. Largest state had 2 variables. [2018-11-07 22:05:53,464 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:53,464 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 22:05:53,464 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:53,465 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 22:05:53,483 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:53,483 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:53,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:53,511 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:53,670 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:53,670 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:54,588 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:54,621 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:54,622 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 6] total 10 [2018-11-07 22:05:54,622 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:54,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 22:05:54,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 22:05:54,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:05:54,624 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-11-07 22:05:54,745 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:54,745 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2018-11-07 22:05:54,746 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 22:05:54,746 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2018-11-07 22:05:54,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:54,748 INFO L225 Difference]: With dead ends: 34 [2018-11-07 22:05:54,748 INFO L226 Difference]: Without dead ends: 24 [2018-11-07 22:05:54,749 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 35 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=37, Invalid=53, Unknown=0, NotChecked=0, Total=90 [2018-11-07 22:05:54,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2018-11-07 22:05:54,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2018-11-07 22:05:54,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2018-11-07 22:05:54,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2018-11-07 22:05:54,754 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 20 [2018-11-07 22:05:54,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:54,755 INFO L480 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2018-11-07 22:05:54,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 22:05:54,755 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2018-11-07 22:05:54,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 22:05:54,756 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:54,756 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:54,756 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:54,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:54,757 INFO L82 PathProgramCache]: Analyzing trace with hash -2092450784, now seen corresponding path program 2 times [2018-11-07 22:05:54,757 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:54,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:54,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:54,759 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:54,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:55,036 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:55,036 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:55,037 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:55,037 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:55,037 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:55,037 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:55,037 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 22:05:55,056 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:55,056 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:05:55,105 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 22:05:55,105 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:55,107 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:55,471 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:05:55,471 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:55,657 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 15 proven. 2 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2018-11-07 22:05:55,678 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:55,678 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4, 4] total 11 [2018-11-07 22:05:55,678 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:55,679 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:05:55,679 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:05:55,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=71, Unknown=0, NotChecked=0, Total=110 [2018-11-07 22:05:55,679 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 9 states. [2018-11-07 22:05:55,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:55,908 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2018-11-07 22:05:55,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2018-11-07 22:05:55,909 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2018-11-07 22:05:55,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:55,910 INFO L225 Difference]: With dead ends: 44 [2018-11-07 22:05:55,910 INFO L226 Difference]: Without dead ends: 34 [2018-11-07 22:05:55,911 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=47, Invalid=85, Unknown=0, NotChecked=0, Total=132 [2018-11-07 22:05:55,911 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2018-11-07 22:05:55,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 30. [2018-11-07 22:05:55,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2018-11-07 22:05:55,916 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2018-11-07 22:05:55,916 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2018-11-07 22:05:55,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:55,917 INFO L480 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2018-11-07 22:05:55,917 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:05:55,917 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2018-11-07 22:05:55,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2018-11-07 22:05:55,918 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:55,918 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:55,919 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:55,919 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:55,919 INFO L82 PathProgramCache]: Analyzing trace with hash -1050905282, now seen corresponding path program 3 times [2018-11-07 22:05:55,919 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:55,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:55,920 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:55,920 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:55,920 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:55,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:56,162 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:56,162 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:56,164 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:56,164 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:56,164 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:56,164 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:56,164 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 22:05:56,177 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:05:56,177 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:05:56,196 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:05:56,196 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:56,199 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:56,235 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:05:56,235 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 25 proven. 30 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:05:56,625 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:56,626 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 8] total 15 [2018-11-07 22:05:56,626 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:56,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 22:05:56,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 22:05:56,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:05:56,627 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 9 states. [2018-11-07 22:05:56,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:56,754 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2018-11-07 22:05:56,754 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2018-11-07 22:05:56,754 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2018-11-07 22:05:56,755 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:56,756 INFO L225 Difference]: With dead ends: 46 [2018-11-07 22:05:56,756 INFO L226 Difference]: Without dead ends: 33 [2018-11-07 22:05:56,757 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2018-11-07 22:05:56,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2018-11-07 22:05:56,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2018-11-07 22:05:56,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2018-11-07 22:05:56,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 35 transitions. [2018-11-07 22:05:56,763 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 35 transitions. Word has length 29 [2018-11-07 22:05:56,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:56,763 INFO L480 AbstractCegarLoop]: Abstraction has 33 states and 35 transitions. [2018-11-07 22:05:56,763 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 22:05:56,764 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 35 transitions. [2018-11-07 22:05:56,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2018-11-07 22:05:56,765 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:56,765 INFO L375 BasicCegarLoop]: trace histogram [8, 7, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:56,765 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:56,765 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:56,765 INFO L82 PathProgramCache]: Analyzing trace with hash -306121381, now seen corresponding path program 4 times [2018-11-07 22:05:56,766 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:56,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:56,767 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:05:56,767 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:56,767 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:56,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:57,031 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,031 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,031 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:57,031 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:57,032 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:57,032 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,032 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 22:05:57,040 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:57,041 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:05:57,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:57,058 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:57,100 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:05:57,101 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:57,317 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 30 proven. 45 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:05:57,337 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:57,337 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8, 9] total 17 [2018-11-07 22:05:57,338 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:57,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2018-11-07 22:05:57,339 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2018-11-07 22:05:57,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:05:57,339 INFO L87 Difference]: Start difference. First operand 33 states and 35 transitions. Second operand 10 states. [2018-11-07 22:05:57,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:05:57,504 INFO L93 Difference]: Finished difference Result 49 states and 54 transitions. [2018-11-07 22:05:57,505 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 22:05:57,506 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2018-11-07 22:05:57,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:05:57,506 INFO L225 Difference]: With dead ends: 49 [2018-11-07 22:05:57,507 INFO L226 Difference]: Without dead ends: 36 [2018-11-07 22:05:57,507 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 56 SyntacticMatches, 3 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:05:57,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2018-11-07 22:05:57,512 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2018-11-07 22:05:57,512 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2018-11-07 22:05:57,513 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2018-11-07 22:05:57,513 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 32 [2018-11-07 22:05:57,513 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:05:57,513 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2018-11-07 22:05:57,514 INFO L481 AbstractCegarLoop]: Interpolant automaton has 10 states. [2018-11-07 22:05:57,514 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2018-11-07 22:05:57,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 22:05:57,515 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:05:57,515 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:05:57,515 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:05:57,515 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:05:57,516 INFO L82 PathProgramCache]: Analyzing trace with hash -249977826, now seen corresponding path program 5 times [2018-11-07 22:05:57,516 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:05:57,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,517 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:05:57,517 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:05:57,517 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:05:57,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:05:57,804 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:05:57,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,805 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:05:57,805 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:05:57,805 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:05:57,805 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:05:57,805 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 22:05:57,815 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:05:57,815 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:05:57,830 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 22:05:57,831 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:05:57,833 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:05:57,920 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:05:57,920 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:05:58,024 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 48 proven. 7 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2018-11-07 22:05:58,044 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:05:58,045 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 5, 5] total 17 [2018-11-07 22:05:58,045 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:05:58,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:05:58,045 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:05:58,046 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=187, Unknown=0, NotChecked=0, Total=272 [2018-11-07 22:05:58,047 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2018-11-07 22:06:01,091 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:01,091 INFO L93 Difference]: Finished difference Result 59 states and 68 transitions. [2018-11-07 22:06:01,093 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:06:01,093 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2018-11-07 22:06:01,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:01,095 INFO L225 Difference]: With dead ends: 59 [2018-11-07 22:06:01,095 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 22:06:01,096 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 67 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=109, Invalid=233, Unknown=0, NotChecked=0, Total=342 [2018-11-07 22:06:01,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 22:06:01,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 42. [2018-11-07 22:06:01,102 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2018-11-07 22:06:01,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2018-11-07 22:06:01,103 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 35 [2018-11-07 22:06:01,103 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:01,104 INFO L480 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2018-11-07 22:06:01,104 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:06:01,104 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2018-11-07 22:06:01,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2018-11-07 22:06:01,105 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:01,105 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 7, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:01,106 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:01,106 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:01,106 INFO L82 PathProgramCache]: Analyzing trace with hash 607533056, now seen corresponding path program 6 times [2018-11-07 22:06:01,106 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:01,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:01,107 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:01,107 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:01,107 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:01,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:01,713 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:01,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:01,714 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:01,714 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:01,714 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:01,714 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:01,715 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 22:06:01,725 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:01,725 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:01,739 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:01,739 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:01,742 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:01,796 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:01,796 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:02,241 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 20 proven. 135 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:02,261 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:02,262 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 24 [2018-11-07 22:06:02,262 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:02,262 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2018-11-07 22:06:02,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2018-11-07 22:06:02,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:02,265 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 13 states. [2018-11-07 22:06:02,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:02,449 INFO L93 Difference]: Finished difference Result 61 states and 68 transitions. [2018-11-07 22:06:02,451 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 22:06:02,451 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2018-11-07 22:06:02,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:02,452 INFO L225 Difference]: With dead ends: 61 [2018-11-07 22:06:02,452 INFO L226 Difference]: Without dead ends: 45 [2018-11-07 22:06:02,453 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 70 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=385, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:02,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2018-11-07 22:06:02,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2018-11-07 22:06:02,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 22:06:02,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-07 22:06:02,459 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 41 [2018-11-07 22:06:02,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:02,459 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-07 22:06:02,459 INFO L481 AbstractCegarLoop]: Interpolant automaton has 13 states. [2018-11-07 22:06:02,460 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-07 22:06:02,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2018-11-07 22:06:02,461 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:02,461 INFO L375 BasicCegarLoop]: trace histogram [12, 11, 8, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:02,461 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:02,461 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:02,461 INFO L82 PathProgramCache]: Analyzing trace with hash 1655862429, now seen corresponding path program 7 times [2018-11-07 22:06:02,462 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:02,462 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:02,463 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:02,463 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:02,463 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:02,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:02,760 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:02,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:02,761 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:02,761 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:02,761 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:02,761 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:02,762 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 22:06:02,770 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:02,771 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:02,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:02,793 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:03,045 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:06:03,046 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:03,868 INFO L134 CoverageAnalysis]: Checked inductivity of 187 backedges. 72 proven. 108 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:06:03,889 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:03,889 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11, 12] total 24 [2018-11-07 22:06:03,889 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:03,890 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2018-11-07 22:06:03,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2018-11-07 22:06:03,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:03,891 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 14 states. [2018-11-07 22:06:04,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:04,116 INFO L93 Difference]: Finished difference Result 64 states and 71 transitions. [2018-11-07 22:06:04,118 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 22:06:04,118 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 44 [2018-11-07 22:06:04,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:04,119 INFO L225 Difference]: With dead ends: 64 [2018-11-07 22:06:04,119 INFO L226 Difference]: Without dead ends: 48 [2018-11-07 22:06:04,120 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 77 SyntacticMatches, 3 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2018-11-07 22:06:04,120 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2018-11-07 22:06:04,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2018-11-07 22:06:04,125 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2018-11-07 22:06:04,126 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 51 transitions. [2018-11-07 22:06:04,126 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 51 transitions. Word has length 44 [2018-11-07 22:06:04,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:04,127 INFO L480 AbstractCegarLoop]: Abstraction has 48 states and 51 transitions. [2018-11-07 22:06:04,127 INFO L481 AbstractCegarLoop]: Interpolant automaton has 14 states. [2018-11-07 22:06:04,127 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 51 transitions. [2018-11-07 22:06:04,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2018-11-07 22:06:04,128 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:04,128 INFO L375 BasicCegarLoop]: trace histogram [13, 12, 9, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:04,128 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:04,129 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:04,129 INFO L82 PathProgramCache]: Analyzing trace with hash -565963040, now seen corresponding path program 8 times [2018-11-07 22:06:04,129 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:04,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:04,130 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:04,130 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:04,130 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:04,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:04,417 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:04,417 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:04,417 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:04,417 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:04,417 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:04,418 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:04,418 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 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 22:06:04,433 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:04,433 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:04,466 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2018-11-07 22:06:04,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:04,468 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:04,580 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:06:04,581 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:05,690 INFO L134 CoverageAnalysis]: Checked inductivity of 222 backedges. 99 proven. 15 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2018-11-07 22:06:05,728 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:05,728 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 6, 6] total 23 [2018-11-07 22:06:05,728 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:05,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 22:06:05,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 22:06:05,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=359, Unknown=0, NotChecked=0, Total=506 [2018-11-07 22:06:05,730 INFO L87 Difference]: Start difference. First operand 48 states and 51 transitions. Second operand 19 states. [2018-11-07 22:06:15,400 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:15,401 INFO L93 Difference]: Finished difference Result 74 states and 85 transitions. [2018-11-07 22:06:15,401 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:06:15,401 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 47 [2018-11-07 22:06:15,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:15,402 INFO L225 Difference]: With dead ends: 74 [2018-11-07 22:06:15,402 INFO L226 Difference]: Without dead ends: 58 [2018-11-07 22:06:15,403 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 116 GetRequests, 90 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=195, Invalid=455, Unknown=0, NotChecked=0, Total=650 [2018-11-07 22:06:15,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2018-11-07 22:06:15,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 54. [2018-11-07 22:06:15,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2018-11-07 22:06:15,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 58 transitions. [2018-11-07 22:06:15,417 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 58 transitions. Word has length 47 [2018-11-07 22:06:15,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:15,417 INFO L480 AbstractCegarLoop]: Abstraction has 54 states and 58 transitions. [2018-11-07 22:06:15,417 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 22:06:15,418 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 58 transitions. [2018-11-07 22:06:15,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2018-11-07 22:06:15,419 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:15,419 INFO L375 BasicCegarLoop]: trace histogram [15, 14, 10, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:15,419 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:15,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:15,420 INFO L82 PathProgramCache]: Analyzing trace with hash -829748866, now seen corresponding path program 9 times [2018-11-07 22:06:15,420 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:15,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,421 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:15,421 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:15,421 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:15,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:15,747 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:15,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:15,748 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:15,748 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:15,748 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:15,748 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:15,748 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 22:06:15,758 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:15,758 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:15,799 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:15,799 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:15,802 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:16,080 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:06:16,081 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:16,992 INFO L134 CoverageAnalysis]: Checked inductivity of 301 backedges. 121 proven. 165 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:06:17,014 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:17,014 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 13, 14] total 29 [2018-11-07 22:06:17,014 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:17,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2018-11-07 22:06:17,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2018-11-07 22:06:17,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:06:17,016 INFO L87 Difference]: Start difference. First operand 54 states and 58 transitions. Second operand 17 states. [2018-11-07 22:06:17,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:17,468 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2018-11-07 22:06:17,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2018-11-07 22:06:17,469 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 53 [2018-11-07 22:06:17,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:17,471 INFO L225 Difference]: With dead ends: 76 [2018-11-07 22:06:17,471 INFO L226 Difference]: Without dead ends: 57 [2018-11-07 22:06:17,472 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 123 GetRequests, 93 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=236, Invalid=576, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:06:17,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2018-11-07 22:06:17,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2018-11-07 22:06:17,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2018-11-07 22:06:17,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 61 transitions. [2018-11-07 22:06:17,487 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 61 transitions. Word has length 53 [2018-11-07 22:06:17,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:17,488 INFO L480 AbstractCegarLoop]: Abstraction has 57 states and 61 transitions. [2018-11-07 22:06:17,488 INFO L481 AbstractCegarLoop]: Interpolant automaton has 17 states. [2018-11-07 22:06:17,488 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 61 transitions. [2018-11-07 22:06:17,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2018-11-07 22:06:17,489 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:17,489 INFO L375 BasicCegarLoop]: trace histogram [16, 15, 11, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:17,489 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:17,489 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:17,494 INFO L82 PathProgramCache]: Analyzing trace with hash 786973339, now seen corresponding path program 10 times [2018-11-07 22:06:17,495 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:17,495 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,496 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:17,496 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:17,496 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:17,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:18,029 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:18,029 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:18,029 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:18,030 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:18,030 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:18,030 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:18,030 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 22:06:18,038 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:18,039 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:18,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:18,068 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:18,129 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:06:18,130 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:19,021 INFO L134 CoverageAnalysis]: Checked inductivity of 345 backedges. 132 proven. 198 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2018-11-07 22:06:19,041 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:19,041 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 14, 15] total 31 [2018-11-07 22:06:19,041 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:19,042 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2018-11-07 22:06:19,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2018-11-07 22:06:19,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:06:19,043 INFO L87 Difference]: Start difference. First operand 57 states and 61 transitions. Second operand 18 states. [2018-11-07 22:06:19,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:19,425 INFO L93 Difference]: Finished difference Result 79 states and 88 transitions. [2018-11-07 22:06:19,425 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2018-11-07 22:06:19,425 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2018-11-07 22:06:19,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:19,426 INFO L225 Difference]: With dead ends: 79 [2018-11-07 22:06:19,426 INFO L226 Difference]: Without dead ends: 60 [2018-11-07 22:06:19,428 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 98 SyntacticMatches, 3 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=268, Invalid=662, Unknown=0, NotChecked=0, Total=930 [2018-11-07 22:06:19,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2018-11-07 22:06:19,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2018-11-07 22:06:19,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2018-11-07 22:06:19,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 64 transitions. [2018-11-07 22:06:19,434 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 64 transitions. Word has length 56 [2018-11-07 22:06:19,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:19,435 INFO L480 AbstractCegarLoop]: Abstraction has 60 states and 64 transitions. [2018-11-07 22:06:19,435 INFO L481 AbstractCegarLoop]: Interpolant automaton has 18 states. [2018-11-07 22:06:19,435 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 64 transitions. [2018-11-07 22:06:19,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2018-11-07 22:06:19,436 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:19,436 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 12, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:19,436 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:19,437 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:19,437 INFO L82 PathProgramCache]: Analyzing trace with hash 794925150, now seen corresponding path program 11 times [2018-11-07 22:06:19,437 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:19,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:19,438 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:19,438 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:19,438 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:19,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:19,773 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:19,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:19,773 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:19,773 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:19,773 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:19,773 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:19,773 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 22:06:19,783 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:19,783 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:06:24,115 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 22:06:24,115 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:24,120 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:24,290 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 22:06:24,290 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:24,453 INFO L134 CoverageAnalysis]: Checked inductivity of 392 backedges. 168 proven. 26 refuted. 0 times theorem prover too weak. 198 trivial. 0 not checked. [2018-11-07 22:06:24,474 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:24,474 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 7, 7] total 29 [2018-11-07 22:06:24,474 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:24,475 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2018-11-07 22:06:24,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2018-11-07 22:06:24,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=225, Invalid=587, Unknown=0, NotChecked=0, Total=812 [2018-11-07 22:06:24,476 INFO L87 Difference]: Start difference. First operand 60 states and 64 transitions. Second operand 24 states. [2018-11-07 22:06:25,848 WARN L179 SmtUtils]: Spent 484.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:06:34,934 WARN L179 SmtUtils]: Spent 472.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:06:41,446 WARN L179 SmtUtils]: Spent 346.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:06:49,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:49,983 INFO L93 Difference]: Finished difference Result 92 states and 106 transitions. [2018-11-07 22:06:49,983 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:06:49,983 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 59 [2018-11-07 22:06:49,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:49,984 INFO L225 Difference]: With dead ends: 92 [2018-11-07 22:06:49,984 INFO L226 Difference]: Without dead ends: 73 [2018-11-07 22:06:49,986 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 112 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 13.2s TimeCoverageRelationStatistics Valid=326, Invalid=793, Unknown=3, NotChecked=0, Total=1122 [2018-11-07 22:06:49,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2018-11-07 22:06:49,992 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 66. [2018-11-07 22:06:49,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2018-11-07 22:06:49,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 71 transitions. [2018-11-07 22:06:49,993 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 71 transitions. Word has length 59 [2018-11-07 22:06:49,993 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:49,993 INFO L480 AbstractCegarLoop]: Abstraction has 66 states and 71 transitions. [2018-11-07 22:06:49,993 INFO L481 AbstractCegarLoop]: Interpolant automaton has 24 states. [2018-11-07 22:06:49,993 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 71 transitions. [2018-11-07 22:06:49,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2018-11-07 22:06:49,994 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:49,994 INFO L375 BasicCegarLoop]: trace histogram [19, 18, 13, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:49,995 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:49,995 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:49,995 INFO L82 PathProgramCache]: Analyzing trace with hash -1319222592, now seen corresponding path program 12 times [2018-11-07 22:06:49,995 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:49,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:49,996 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:49,996 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:49,996 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:50,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:50,562 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:50,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:50,562 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:50,562 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:50,563 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:50,563 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:50,563 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 22:06:50,579 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:06:50,579 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:06:50,599 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:06:50,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:06:50,602 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:50,727 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:06:50,727 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:51,792 INFO L134 CoverageAnalysis]: Checked inductivity of 495 backedges. 196 proven. 273 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:06:51,811 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:51,811 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 16, 17] total 36 [2018-11-07 22:06:51,811 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:51,812 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2018-11-07 22:06:51,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2018-11-07 22:06:51,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:06:51,813 INFO L87 Difference]: Start difference. First operand 66 states and 71 transitions. Second operand 21 states. [2018-11-07 22:06:52,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:52,273 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2018-11-07 22:06:52,273 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2018-11-07 22:06:52,273 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2018-11-07 22:06:52,274 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:52,275 INFO L225 Difference]: With dead ends: 91 [2018-11-07 22:06:52,275 INFO L226 Difference]: Without dead ends: 69 [2018-11-07 22:06:52,276 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 114 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 22:06:52,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2018-11-07 22:06:52,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2018-11-07 22:06:52,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2018-11-07 22:06:52,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 74 transitions. [2018-11-07 22:06:52,284 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 74 transitions. Word has length 65 [2018-11-07 22:06:52,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:52,285 INFO L480 AbstractCegarLoop]: Abstraction has 69 states and 74 transitions. [2018-11-07 22:06:52,285 INFO L481 AbstractCegarLoop]: Interpolant automaton has 21 states. [2018-11-07 22:06:52,285 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 74 transitions. [2018-11-07 22:06:52,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2018-11-07 22:06:52,286 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:52,286 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 14, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:52,286 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:52,287 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:52,287 INFO L82 PathProgramCache]: Analyzing trace with hash -1618626467, now seen corresponding path program 13 times [2018-11-07 22:06:52,287 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:52,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:52,288 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:06:52,288 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:52,288 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:52,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:53,505 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:53,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:53,506 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:53,506 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:53,506 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:53,506 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:53,506 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 22:06:53,515 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:53,515 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:06:53,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:53,543 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:06:53,626 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:06:53,626 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:06:54,729 INFO L134 CoverageAnalysis]: Checked inductivity of 551 backedges. 210 proven. 315 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2018-11-07 22:06:54,749 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:06:54,749 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 17, 18] total 38 [2018-11-07 22:06:54,749 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:06:54,749 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2018-11-07 22:06:54,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2018-11-07 22:06:54,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:06:54,750 INFO L87 Difference]: Start difference. First operand 69 states and 74 transitions. Second operand 22 states. [2018-11-07 22:06:55,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:06:55,508 INFO L93 Difference]: Finished difference Result 94 states and 105 transitions. [2018-11-07 22:06:55,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2018-11-07 22:06:55,508 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 68 [2018-11-07 22:06:55,509 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:06:55,509 INFO L225 Difference]: With dead ends: 94 [2018-11-07 22:06:55,510 INFO L226 Difference]: Without dead ends: 72 [2018-11-07 22:06:55,511 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=394, Invalid=1012, Unknown=0, NotChecked=0, Total=1406 [2018-11-07 22:06:55,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2018-11-07 22:06:55,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2018-11-07 22:06:55,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2018-11-07 22:06:55,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 77 transitions. [2018-11-07 22:06:55,519 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 77 transitions. Word has length 68 [2018-11-07 22:06:55,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:06:55,519 INFO L480 AbstractCegarLoop]: Abstraction has 72 states and 77 transitions. [2018-11-07 22:06:55,520 INFO L481 AbstractCegarLoop]: Interpolant automaton has 22 states. [2018-11-07 22:06:55,520 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 77 transitions. [2018-11-07 22:06:55,521 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2018-11-07 22:06:55,521 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:06:55,521 INFO L375 BasicCegarLoop]: trace histogram [21, 20, 15, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:06:55,521 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:06:55,521 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:06:55,521 INFO L82 PathProgramCache]: Analyzing trace with hash -512392800, now seen corresponding path program 14 times [2018-11-07 22:06:55,522 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:06:55,522 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:55,523 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:06:55,523 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:06:55,523 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:06:55,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:06:56,211 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 0 proven. 610 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:06:56,211 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:56,211 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:06:56,211 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:06:56,211 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:06:56,212 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:06:56,212 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 22:06:56,220 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:06:56,220 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:01,773 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2018-11-07 22:07:01,773 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:01,776 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:01,963 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 22:07:01,963 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:02,184 INFO L134 CoverageAnalysis]: Checked inductivity of 610 backedges. 255 proven. 40 refuted. 0 times theorem prover too weak. 315 trivial. 0 not checked. [2018-11-07 22:07:02,204 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:02,204 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 8, 8] total 35 [2018-11-07 22:07:02,204 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:02,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 22:07:02,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 22:07:02,205 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=871, Unknown=0, NotChecked=0, Total=1190 [2018-11-07 22:07:02,206 INFO L87 Difference]: Start difference. First operand 72 states and 77 transitions. Second operand 29 states. [2018-11-07 22:07:06,025 WARN L179 SmtUtils]: Spent 1.29 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:07:13,820 WARN L179 SmtUtils]: Spent 1.28 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:07:14,507 WARN L179 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:07:19,427 WARN L179 SmtUtils]: Spent 2.05 s on a formula simplification. DAG size of input: 20 DAG size of output: 12 [2018-11-07 22:07:34,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:34,613 INFO L93 Difference]: Finished difference Result 105 states and 120 transitions. [2018-11-07 22:07:34,613 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:07:34,613 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 71 [2018-11-07 22:07:34,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:34,614 INFO L225 Difference]: With dead ends: 105 [2018-11-07 22:07:34,614 INFO L226 Difference]: Without dead ends: 83 [2018-11-07 22:07:34,615 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 135 SyntacticMatches, 2 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=467, Invalid=1169, Unknown=4, NotChecked=0, Total=1640 [2018-11-07 22:07:34,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2018-11-07 22:07:34,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 78. [2018-11-07 22:07:34,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2018-11-07 22:07:34,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 84 transitions. [2018-11-07 22:07:34,622 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 84 transitions. Word has length 71 [2018-11-07 22:07:34,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:34,623 INFO L480 AbstractCegarLoop]: Abstraction has 78 states and 84 transitions. [2018-11-07 22:07:34,623 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 22:07:34,623 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 84 transitions. [2018-11-07 22:07:34,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2018-11-07 22:07:34,624 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:34,624 INFO L375 BasicCegarLoop]: trace histogram [23, 22, 16, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:34,624 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:34,624 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:34,624 INFO L82 PathProgramCache]: Analyzing trace with hash 2099613118, now seen corresponding path program 15 times [2018-11-07 22:07:34,624 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:34,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:34,625 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:34,625 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:34,625 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:34,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:36,093 WARN L179 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 14 DAG size of output: 10 [2018-11-07 22:07:36,101 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 44 proven. 693 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:36,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:36,101 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:36,101 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:36,101 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:36,101 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:36,101 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 22:07:36,127 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:07:36,128 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:07:36,170 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:07:36,170 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:36,172 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:36,378 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:07:36,379 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:39,129 INFO L134 CoverageAnalysis]: Checked inductivity of 737 backedges. 160 proven. 570 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2018-11-07 22:07:39,148 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:39,148 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22, 23] total 46 [2018-11-07 22:07:39,148 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:39,149 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2018-11-07 22:07:39,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2018-11-07 22:07:39,150 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:07:39,151 INFO L87 Difference]: Start difference. First operand 78 states and 84 transitions. Second operand 25 states. [2018-11-07 22:07:39,728 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:39,728 INFO L93 Difference]: Finished difference Result 109 states and 123 transitions. [2018-11-07 22:07:39,729 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2018-11-07 22:07:39,729 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 77 [2018-11-07 22:07:39,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:39,730 INFO L225 Difference]: With dead ends: 109 [2018-11-07 22:07:39,730 INFO L226 Difference]: Without dead ends: 84 [2018-11-07 22:07:39,731 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 178 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 4.3s TimeCoverageRelationStatistics Valid=595, Invalid=1475, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 22:07:39,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2018-11-07 22:07:39,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2018-11-07 22:07:39,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2018-11-07 22:07:39,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 90 transitions. [2018-11-07 22:07:39,738 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 90 transitions. Word has length 77 [2018-11-07 22:07:39,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:39,738 INFO L480 AbstractCegarLoop]: Abstraction has 84 states and 90 transitions. [2018-11-07 22:07:39,738 INFO L481 AbstractCegarLoop]: Interpolant automaton has 25 states. [2018-11-07 22:07:39,738 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 90 transitions. [2018-11-07 22:07:39,739 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2018-11-07 22:07:39,739 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:39,739 INFO L375 BasicCegarLoop]: trace histogram [25, 24, 18, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:39,739 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:39,739 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:39,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1326089058, now seen corresponding path program 16 times [2018-11-07 22:07:39,740 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:39,740 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:39,741 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:07:39,741 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:39,741 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:39,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:40,546 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 48 proven. 828 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:40,546 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:40,546 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:40,547 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:40,547 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:40,547 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:40,547 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 22:07:40,555 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:40,556 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:07:40,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:40,578 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:40,615 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:07:40,615 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:42,591 INFO L134 CoverageAnalysis]: Checked inductivity of 876 backedges. 323 proven. 513 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2018-11-07 22:07:42,613 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:42,613 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 21, 22] total 47 [2018-11-07 22:07:42,613 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:42,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2018-11-07 22:07:42,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2018-11-07 22:07:42,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:07:42,615 INFO L87 Difference]: Start difference. First operand 84 states and 90 transitions. Second operand 27 states. [2018-11-07 22:07:43,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:07:43,240 INFO L93 Difference]: Finished difference Result 115 states and 129 transitions. [2018-11-07 22:07:43,240 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2018-11-07 22:07:43,240 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 83 [2018-11-07 22:07:43,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:07:43,242 INFO L225 Difference]: With dead ends: 115 [2018-11-07 22:07:43,242 INFO L226 Difference]: Without dead ends: 90 [2018-11-07 22:07:43,243 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=616, Invalid=1546, Unknown=0, NotChecked=0, Total=2162 [2018-11-07 22:07:43,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-07 22:07:43,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2018-11-07 22:07:43,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2018-11-07 22:07:43,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 96 transitions. [2018-11-07 22:07:43,252 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 96 transitions. Word has length 83 [2018-11-07 22:07:43,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:07:43,252 INFO L480 AbstractCegarLoop]: Abstraction has 90 states and 96 transitions. [2018-11-07 22:07:43,252 INFO L481 AbstractCegarLoop]: Interpolant automaton has 27 states. [2018-11-07 22:07:43,253 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 96 transitions. [2018-11-07 22:07:43,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2018-11-07 22:07:43,253 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:07:43,254 INFO L375 BasicCegarLoop]: trace histogram [27, 26, 20, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:07:43,254 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:07:43,254 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:07:43,254 INFO L82 PathProgramCache]: Analyzing trace with hash -502348930, now seen corresponding path program 17 times [2018-11-07 22:07:43,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:07:43,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:43,255 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:07:43,255 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:07:43,255 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:07:43,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:07:44,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 52 proven. 975 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 22:07:44,490 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:44,490 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:07:44,490 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:07:44,491 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:07:44,491 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:07:44,491 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 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 22:07:44,499 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:07:44,499 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:07:44,912 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2018-11-07 22:07:44,912 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:07:44,928 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:07:45,305 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-11-07 22:07:45,305 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:07:45,819 INFO L134 CoverageAnalysis]: Checked inductivity of 1027 backedges. 400 proven. 57 refuted. 0 times theorem prover too weak. 570 trivial. 0 not checked. [2018-11-07 22:07:45,839 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:07:45,839 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 9, 9] total 43 [2018-11-07 22:07:45,839 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:07:45,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2018-11-07 22:07:45,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2018-11-07 22:07:45,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=480, Invalid=1326, Unknown=0, NotChecked=0, Total=1806 [2018-11-07 22:07:45,841 INFO L87 Difference]: Start difference. First operand 90 states and 96 transitions. Second operand 36 states. [2018-11-07 22:07:52,051 WARN L179 SmtUtils]: Spent 4.19 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:08:00,031 WARN L179 SmtUtils]: Spent 4.44 s on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:08:06,007 WARN L179 SmtUtils]: Spent 2.14 s on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:08:48,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:48,188 INFO L93 Difference]: Finished difference Result 129 states and 147 transitions. [2018-11-07 22:08:48,188 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2018-11-07 22:08:48,188 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 89 [2018-11-07 22:08:48,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:48,189 INFO L225 Difference]: With dead ends: 129 [2018-11-07 22:08:48,190 INFO L226 Difference]: Without dead ends: 104 [2018-11-07 22:08:48,191 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 222 GetRequests, 170 SyntacticMatches, 3 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 44.6s TimeCoverageRelationStatistics Valid=723, Invalid=1822, Unknown=5, NotChecked=0, Total=2550 [2018-11-07 22:08:48,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2018-11-07 22:08:48,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 99. [2018-11-07 22:08:48,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2018-11-07 22:08:48,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 106 transitions. [2018-11-07 22:08:48,200 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 106 transitions. Word has length 89 [2018-11-07 22:08:48,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:48,200 INFO L480 AbstractCegarLoop]: Abstraction has 99 states and 106 transitions. [2018-11-07 22:08:48,200 INFO L481 AbstractCegarLoop]: Interpolant automaton has 36 states. [2018-11-07 22:08:48,200 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 106 transitions. [2018-11-07 22:08:48,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2018-11-07 22:08:48,201 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:48,202 INFO L375 BasicCegarLoop]: trace histogram [30, 29, 22, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:48,202 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:48,202 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:48,202 INFO L82 PathProgramCache]: Analyzing trace with hash -2002812611, now seen corresponding path program 18 times [2018-11-07 22:08:48,202 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:48,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:48,203 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:48,203 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:48,203 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:48,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:49,946 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 140 proven. 1134 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:08:49,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:49,947 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:49,947 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:49,947 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:49,947 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:49,947 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 22:08:49,957 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 22:08:49,957 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 22:08:49,981 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 22:08:49,981 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:08:49,984 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:50,050 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:08:50,050 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:52,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1276 backedges. 460 proven. 759 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:08:52,668 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:52,669 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 25, 26] total 55 [2018-11-07 22:08:52,669 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:52,669 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2018-11-07 22:08:52,669 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2018-11-07 22:08:52,670 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:08:52,670 INFO L87 Difference]: Start difference. First operand 99 states and 106 transitions. Second operand 31 states. [2018-11-07 22:08:53,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:53,591 INFO L93 Difference]: Finished difference Result 133 states and 149 transitions. [2018-11-07 22:08:53,594 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2018-11-07 22:08:53,594 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 98 [2018-11-07 22:08:53,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:53,596 INFO L225 Difference]: With dead ends: 133 [2018-11-07 22:08:53,596 INFO L226 Difference]: Without dead ends: 105 [2018-11-07 22:08:53,598 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 171 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=832, Invalid=2138, Unknown=0, NotChecked=0, Total=2970 [2018-11-07 22:08:53,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 105 states. [2018-11-07 22:08:53,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 105 to 105. [2018-11-07 22:08:53,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-11-07 22:08:53,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 112 transitions. [2018-11-07 22:08:53,608 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 112 transitions. Word has length 98 [2018-11-07 22:08:53,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:53,608 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 112 transitions. [2018-11-07 22:08:53,608 INFO L481 AbstractCegarLoop]: Interpolant automaton has 31 states. [2018-11-07 22:08:53,608 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 112 transitions. [2018-11-07 22:08:53,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2018-11-07 22:08:53,609 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:53,609 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 24, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:53,609 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:53,610 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:53,610 INFO L82 PathProgramCache]: Analyzing trace with hash 615751261, now seen corresponding path program 19 times [2018-11-07 22:08:53,610 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:53,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:53,611 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 22:08:53,611 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:53,611 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:53,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:54,318 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 150 proven. 1305 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:08:54,318 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:54,318 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:08:54,319 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:08:54,319 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:08:54,319 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:08:54,319 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 22:08:54,329 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:54,329 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 22:08:54,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:08:54,360 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:08:54,477 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:08:54,477 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:08:57,798 INFO L134 CoverageAnalysis]: Checked inductivity of 1457 backedges. 500 proven. 900 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2018-11-07 22:08:57,818 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:08:57,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 27, 28] total 59 [2018-11-07 22:08:57,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:08:57,819 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2018-11-07 22:08:57,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2018-11-07 22:08:57,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 22:08:57,821 INFO L87 Difference]: Start difference. First operand 105 states and 112 transitions. Second operand 33 states. [2018-11-07 22:08:58,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 22:08:58,963 INFO L93 Difference]: Finished difference Result 139 states and 155 transitions. [2018-11-07 22:08:58,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 22:08:58,964 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 104 [2018-11-07 22:08:58,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 22:08:58,966 INFO L225 Difference]: With dead ends: 139 [2018-11-07 22:08:58,966 INFO L226 Difference]: Without dead ends: 111 [2018-11-07 22:08:58,967 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 181 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=952, Invalid=2470, Unknown=0, NotChecked=0, Total=3422 [2018-11-07 22:08:58,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2018-11-07 22:08:58,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2018-11-07 22:08:58,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2018-11-07 22:08:58,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 118 transitions. [2018-11-07 22:08:58,977 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 118 transitions. Word has length 104 [2018-11-07 22:08:58,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 22:08:58,978 INFO L480 AbstractCegarLoop]: Abstraction has 111 states and 118 transitions. [2018-11-07 22:08:58,978 INFO L481 AbstractCegarLoop]: Interpolant automaton has 33 states. [2018-11-07 22:08:58,978 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 118 transitions. [2018-11-07 22:08:58,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2018-11-07 22:08:58,979 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 22:08:58,979 INFO L375 BasicCegarLoop]: trace histogram [34, 33, 26, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 22:08:58,979 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 22:08:58,980 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 22:08:58,980 INFO L82 PathProgramCache]: Analyzing trace with hash 323314557, now seen corresponding path program 20 times [2018-11-07 22:08:58,980 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 22:08:58,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:58,981 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 22:08:58,981 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 22:08:58,981 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 22:08:58,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 22:09:00,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 160 proven. 1488 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2018-11-07 22:09:00,866 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:00,867 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 22:09:00,867 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 22:09:00,867 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 22:09:00,867 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 22:09:00,867 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 22:09:00,880 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 22:09:00,880 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 22:09:00,912 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2018-11-07 22:09:00,913 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 22:09:00,915 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 22:09:01,316 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-11-07 22:09:01,317 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 22:09:01,740 INFO L134 CoverageAnalysis]: Checked inductivity of 1650 backedges. 598 proven. 77 refuted. 0 times theorem prover too weak. 975 trivial. 0 not checked. [2018-11-07 22:09:01,761 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 22:09:01,761 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 10, 10] total 51 [2018-11-07 22:09:01,761 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 22:09:01,762 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2018-11-07 22:09:01,762 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2018-11-07 22:09:01,763 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=651, Invalid=1899, Unknown=0, NotChecked=0, Total=2550 [2018-11-07 22:09:01,763 INFO L87 Difference]: Start difference. First operand 111 states and 118 transitions. Second operand 43 states. [2018-11-07 22:09:16,445 WARN L179 SmtUtils]: Spent 6.44 s on a formula simplification. DAG size of input: 36 DAG size of output: 12 [2018-11-07 22:09:21,665 WARN L179 SmtUtils]: Spent 438.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:09:22,623 WARN L179 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 12 [2018-11-07 22:09:36,739 WARN L179 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 12 [2018-11-07 22:09:51,710 WARN L179 SmtUtils]: Spent 2.67 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 [2018-11-07 22:10:19,680 WARN L179 SmtUtils]: Spent 4.85 s on a formula simplification. DAG size of input: 32 DAG size of output: 12 Received shutdown request... [2018-11-07 22:10:24,303 WARN L832 $PredicateComparison]: unable to prove that (and (< (mod (+ c_main_~x~0 4294967285) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967281) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967291) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967293) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967295) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967287) 4294967296) 65521) (< (mod (+ c_main_~x~0 4294967283) 4294967296) 65521)) is different from false [2018-11-07 22:10:24,308 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2018-11-07 22:10:24,308 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 22:10:24,315 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 22:10:24,315 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 10:10:24 BoogieIcfgContainer [2018-11-07 22:10:24,315 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 22:10:24,316 INFO L168 Benchmark]: Toolchain (without parser) took 273915.01 ms. Allocated memory was 1.5 GB in the beginning and 2.5 GB in the end (delta: 945.8 MB). Free memory was 1.4 GB in the beginning and 1.7 GB in the end (delta: -339.9 MB). Peak memory consumption was 605.9 MB. Max. memory is 7.1 GB. [2018-11-07 22:10:24,317 INFO L168 Benchmark]: CDTParser took 0.27 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:10:24,317 INFO L168 Benchmark]: CACSL2BoogieTranslator took 274.27 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 22:10:24,318 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:10:24,318 INFO L168 Benchmark]: Boogie Preprocessor took 20.87 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 22:10:24,318 INFO L168 Benchmark]: RCFGBuilder took 347.09 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 718.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -766.7 MB). Peak memory consumption was 24.2 MB. Max. memory is 7.1 GB. [2018-11-07 22:10:24,319 INFO L168 Benchmark]: TraceAbstraction took 273244.37 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 227.0 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 416.3 MB). Peak memory consumption was 643.3 MB. Max. memory is 7.1 GB. [2018-11-07 22:10:24,323 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 274.27 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. * Boogie Procedure Inliner took 24.17 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * Boogie Preprocessor took 20.87 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. * RCFGBuilder took 347.09 ms. Allocated memory was 1.5 GB in the beginning and 2.2 GB in the end (delta: 718.8 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -766.7 MB). Peak memory consumption was 24.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 273244.37 ms. Allocated memory was 2.2 GB in the beginning and 2.5 GB in the end (delta: 227.0 MB). Free memory was 2.2 GB in the beginning and 1.7 GB in the end (delta: 416.3 MB). Peak memory consumption was 643.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 4]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 4). Cancelled while BasicCegarLoop was constructing difference of abstraction (111states) and FLOYD_HOARE automaton (currently 41 states, 43 states before enhancement),while ReachableStatesComputation was computing reachable states (143 states constructedinput type IntersectNwa). - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 19 locations, 1 error locations. TIMEOUT Result, 273.1s OverallTime, 24 OverallIterations, 34 TraceHistogramMax, 222.2s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 532 SDtfs, 356 SDslu, 6679 SDs, 0 SdLazy, 11125 SolverSat, 646 SolverUnsat, 25 SolverUnknown, 0 SolverNotchecked, 77.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2931 GetRequests, 2233 SyntacticMatches, 52 SemanticMatches, 646 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 433 ImplicationChecksByTransitivity, 176.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=111occurred in iteration=23, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.5s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 23 MinimizatonAttempts, 30 StatesRemovedByMinimization, 7 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.0s SsaConstructionTime, 11.0s SatisfiabilityAnalysisTime, 37.8s InterpolantComputationTime, 2491 NumberOfCodeBlocks, 2272 NumberOfCodeBlocksAsserted, 100 NumberOfCheckSat, 3658 ConstructedInterpolants, 0 QuantifiedInterpolants, 1494854 SizeOfPredicates, 17 NumberOfNonLiveVariables, 1796 ConjunctsInSsa, 463 ConjunctsInUnsatCore, 68 InterpolantComputations, 4 PerfectInterpolantSequences, 13244/31695 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown