java -Xmx8000000000 -jar /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data -tc ../../../trunk/examples/toolchains/AutomizerCInline.xml -s ../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf -i ../../../trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.23-df4b876 [2018-11-07 16:50:08,413 INFO L170 SettingsManager]: Resetting all preferences to default values... [2018-11-07 16:50:08,415 INFO L174 SettingsManager]: Resetting UltimateCore preferences to default values [2018-11-07 16:50:08,427 INFO L177 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2018-11-07 16:50:08,427 INFO L174 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2018-11-07 16:50:08,428 INFO L174 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2018-11-07 16:50:08,430 INFO L174 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2018-11-07 16:50:08,431 INFO L174 SettingsManager]: Resetting LassoRanker preferences to default values [2018-11-07 16:50:08,433 INFO L174 SettingsManager]: Resetting Reaching Definitions preferences to default values [2018-11-07 16:50:08,434 INFO L174 SettingsManager]: Resetting SyntaxChecker preferences to default values [2018-11-07 16:50:08,435 INFO L177 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2018-11-07 16:50:08,435 INFO L174 SettingsManager]: Resetting LTL2Aut preferences to default values [2018-11-07 16:50:08,436 INFO L174 SettingsManager]: Resetting PEA to Boogie preferences to default values [2018-11-07 16:50:08,437 INFO L174 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2018-11-07 16:50:08,438 INFO L174 SettingsManager]: Resetting ChcToBoogie preferences to default values [2018-11-07 16:50:08,439 INFO L174 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2018-11-07 16:50:08,440 INFO L174 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2018-11-07 16:50:08,442 INFO L174 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2018-11-07 16:50:08,444 INFO L174 SettingsManager]: Resetting CodeCheck preferences to default values [2018-11-07 16:50:08,446 INFO L174 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2018-11-07 16:50:08,447 INFO L174 SettingsManager]: Resetting RCFGBuilder preferences to default values [2018-11-07 16:50:08,448 INFO L174 SettingsManager]: Resetting TraceAbstraction preferences to default values [2018-11-07 16:50:08,451 INFO L177 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2018-11-07 16:50:08,451 INFO L177 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2018-11-07 16:50:08,451 INFO L174 SettingsManager]: Resetting TreeAutomizer preferences to default values [2018-11-07 16:50:08,452 INFO L174 SettingsManager]: Resetting IcfgTransformer preferences to default values [2018-11-07 16:50:08,453 INFO L174 SettingsManager]: Resetting Boogie Printer preferences to default values [2018-11-07 16:50:08,454 INFO L174 SettingsManager]: Resetting ReqPrinter preferences to default values [2018-11-07 16:50:08,455 INFO L174 SettingsManager]: Resetting Witness Printer preferences to default values [2018-11-07 16:50:08,456 INFO L177 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2018-11-07 16:50:08,456 INFO L174 SettingsManager]: Resetting CDTParser preferences to default values [2018-11-07 16:50:08,457 INFO L177 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2018-11-07 16:50:08,457 INFO L177 SettingsManager]: ReqParser provides no preferences, ignoring... [2018-11-07 16:50:08,457 INFO L174 SettingsManager]: Resetting SmtParser preferences to default values [2018-11-07 16:50:08,458 INFO L174 SettingsManager]: Resetting Witness Parser preferences to default values [2018-11-07 16:50:08,459 INFO L181 SettingsManager]: Finished resetting all preferences to default values... [2018-11-07 16:50:08,459 INFO L98 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/taipan/svcomp-Reach-64bit-Taipan_Default-INT.epf [2018-11-07 16:50:08,475 INFO L110 SettingsManager]: Loading preferences was successful [2018-11-07 16:50:08,475 INFO L112 SettingsManager]: Preferences different from defaults after loading the file: [2018-11-07 16:50:08,476 INFO L131 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2018-11-07 16:50:08,476 INFO L133 SettingsManager]: * User list type=DISABLED [2018-11-07 16:50:08,476 INFO L133 SettingsManager]: * calls to implemented procedures=false [2018-11-07 16:50:08,477 INFO L131 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2018-11-07 16:50:08,477 INFO L133 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2018-11-07 16:50:08,477 INFO L133 SettingsManager]: * Octagon Domain=false [2018-11-07 16:50:08,477 INFO L133 SettingsManager]: * Abstract domain=CompoundDomain [2018-11-07 16:50:08,477 INFO L133 SettingsManager]: * Log string format=TERM [2018-11-07 16:50:08,477 INFO L133 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2018-11-07 16:50:08,478 INFO L133 SettingsManager]: * Use the RCFG-of-the-future interface=true [2018-11-07 16:50:08,478 INFO L131 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2018-11-07 16:50:08,478 INFO L133 SettingsManager]: * Overapproximate operations on floating types=true [2018-11-07 16:50:08,479 INFO L133 SettingsManager]: * Check division by zero=IGNORE [2018-11-07 16:50:08,479 INFO L133 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2018-11-07 16:50:08,479 INFO L133 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2018-11-07 16:50:08,479 INFO L133 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2018-11-07 16:50:08,479 INFO L133 SettingsManager]: * Check if freed pointer was valid=false [2018-11-07 16:50:08,480 INFO L133 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2018-11-07 16:50:08,480 INFO L131 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2018-11-07 16:50:08,480 INFO L133 SettingsManager]: * Size of a code block=SequenceOfStatements [2018-11-07 16:50:08,480 INFO L133 SettingsManager]: * To the following directory=./dump/ [2018-11-07 16:50:08,480 INFO L133 SettingsManager]: * SMT solver=External_DefaultMode [2018-11-07 16:50:08,481 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:50:08,481 INFO L131 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2018-11-07 16:50:08,481 INFO L133 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2018-11-07 16:50:08,481 INFO L133 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2018-11-07 16:50:08,481 INFO L133 SettingsManager]: * Trace refinement strategy=TAIPAN [2018-11-07 16:50:08,482 INFO L133 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2018-11-07 16:50:08,482 INFO L133 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2018-11-07 16:50:08,482 INFO L133 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2018-11-07 16:50:08,482 INFO L133 SettingsManager]: * To the following directory=dump/ [2018-11-07 16:50:08,482 INFO L133 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES [2018-11-07 16:50:08,525 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2018-11-07 16:50:08,545 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2018-11-07 16:50:08,550 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2018-11-07 16:50:08,551 INFO L271 PluginConnector]: Initializing CDTParser... [2018-11-07 16:50:08,552 INFO L276 PluginConnector]: CDTParser initialized [2018-11-07 16:50:08,553 INFO L418 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-11-07 16:50:08,634 INFO L218 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4e69535d/c4119a4577b54d76bf7763b43f32bcd7/FLAG7df1ec19a [2018-11-07 16:50:09,112 INFO L298 CDTParser]: Found 1 translation units. [2018-11-07 16:50:09,113 INFO L158 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loops-crafted-1/Mono6_false-unreach-call1.c [2018-11-07 16:50:09,120 INFO L346 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4e69535d/c4119a4577b54d76bf7763b43f32bcd7/FLAG7df1ec19a [2018-11-07 16:50:09,146 INFO L354 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b4e69535d/c4119a4577b54d76bf7763b43f32bcd7 [2018-11-07 16:50:09,160 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2018-11-07 16:50:09,162 INFO L131 ToolchainWalker]: Walking toolchain with 5 elements. [2018-11-07 16:50:09,165 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2018-11-07 16:50:09,165 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2018-11-07 16:50:09,172 INFO L276 PluginConnector]: CACSL2BoogieTranslator initialized [2018-11-07 16:50:09,173 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,178 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1cd3170 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09, skipping insertion in model container [2018-11-07 16:50:09,178 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,189 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2018-11-07 16:50:09,218 INFO L174 MainTranslator]: Built tables and reachable declarations [2018-11-07 16:50:09,416 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:50:09,420 INFO L189 MainTranslator]: Completed pre-run [2018-11-07 16:50:09,438 INFO L202 PostProcessor]: Analyzing one entry point: main [2018-11-07 16:50:09,454 INFO L193 MainTranslator]: Completed translation [2018-11-07 16:50:09,455 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09 WrapperNode [2018-11-07 16:50:09,455 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2018-11-07 16:50:09,456 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2018-11-07 16:50:09,456 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2018-11-07 16:50:09,456 INFO L276 PluginConnector]: Boogie Procedure Inliner initialized [2018-11-07 16:50:09,467 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,473 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,480 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2018-11-07 16:50:09,481 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2018-11-07 16:50:09,481 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2018-11-07 16:50:09,481 INFO L276 PluginConnector]: Boogie Preprocessor initialized [2018-11-07 16:50:09,493 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,493 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,494 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,494 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,500 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,506 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,507 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... [2018-11-07 16:50:09,511 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2018-11-07 16:50:09,512 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2018-11-07 16:50:09,512 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2018-11-07 16:50:09,512 INFO L276 PluginConnector]: RCFGBuilder initialized [2018-11-07 16:50:09,513 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2018-11-07 16:50:09,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2018-11-07 16:50:09,664 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2018-11-07 16:50:09,664 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2018-11-07 16:50:09,664 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2018-11-07 16:50:09,665 INFO L130 BoogieDeclarations]: Found specification of procedure main [2018-11-07 16:50:09,665 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2018-11-07 16:50:09,665 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2018-11-07 16:50:09,665 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2018-11-07 16:50:10,034 INFO L276 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2018-11-07 16:50:10,035 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:50:10 BoogieIcfgContainer [2018-11-07 16:50:10,035 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2018-11-07 16:50:10,036 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2018-11-07 16:50:10,036 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2018-11-07 16:50:10,040 INFO L276 PluginConnector]: TraceAbstraction initialized [2018-11-07 16:50:10,040 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:50:09" (1/3) ... [2018-11-07 16:50:10,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8a2197f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:50:10, skipping insertion in model container [2018-11-07 16:50:10,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:50:09" (2/3) ... [2018-11-07 16:50:10,042 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@8a2197f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:50:10, skipping insertion in model container [2018-11-07 16:50:10,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:50:10" (3/3) ... [2018-11-07 16:50:10,044 INFO L112 eAbstractionObserver]: Analyzing ICFG Mono6_false-unreach-call1.c [2018-11-07 16:50:10,055 INFO L136 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2018-11-07 16:50:10,070 INFO L148 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2018-11-07 16:50:10,109 INFO L257 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2018-11-07 16:50:10,199 INFO L382 AbstractCegarLoop]: Interprodecural is true [2018-11-07 16:50:10,200 INFO L383 AbstractCegarLoop]: Hoare is true [2018-11-07 16:50:10,200 INFO L384 AbstractCegarLoop]: Compute interpolants for FPandBP [2018-11-07 16:50:10,200 INFO L385 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2018-11-07 16:50:10,201 INFO L386 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2018-11-07 16:50:10,201 INFO L387 AbstractCegarLoop]: Difference is false [2018-11-07 16:50:10,201 INFO L388 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2018-11-07 16:50:10,201 INFO L393 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2018-11-07 16:50:10,229 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2018-11-07 16:50:10,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2018-11-07 16:50:10,238 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:10,241 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:10,245 INFO L423 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:10,251 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:10,252 INFO L82 PathProgramCache]: Analyzing trace with hash -2008095039, now seen corresponding path program 1 times [2018-11-07 16:50:10,254 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:10,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,301 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:10,301 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,301 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:10,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:10,359 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:10,361 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:50:10,361 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2018-11-07 16:50:10,362 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:50:10,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2018-11-07 16:50:10,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2018-11-07 16:50:10,379 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:50:10,381 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2018-11-07 16:50:10,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:10,406 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2018-11-07 16:50:10,406 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2018-11-07 16:50:10,408 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2018-11-07 16:50:10,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:10,417 INFO L225 Difference]: With dead ends: 33 [2018-11-07 16:50:10,418 INFO L226 Difference]: Without dead ends: 14 [2018-11-07 16:50:10,422 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2018-11-07 16:50:10,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2018-11-07 16:50:10,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2018-11-07 16:50:10,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2018-11-07 16:50:10,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2018-11-07 16:50:10,463 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2018-11-07 16:50:10,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:10,463 INFO L480 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2018-11-07 16:50:10,464 INFO L481 AbstractCegarLoop]: Interpolant automaton has 2 states. [2018-11-07 16:50:10,464 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2018-11-07 16:50:10,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2018-11-07 16:50:10,465 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:10,465 INFO L375 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:10,465 INFO L423 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:10,466 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:10,466 INFO L82 PathProgramCache]: Analyzing trace with hash 1715940768, now seen corresponding path program 1 times [2018-11-07 16:50:10,466 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:10,467 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,468 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:10,468 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,468 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:10,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:10,650 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:10,651 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2018-11-07 16:50:10,651 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2018-11-07 16:50:10,651 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:50:10,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:50:10,654 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:50:10,654 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 16:50:10,655 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand 5 states. [2018-11-07 16:50:10,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:10,744 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2018-11-07 16:50:10,744 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2018-11-07 16:50:10,744 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 11 [2018-11-07 16:50:10,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:10,745 INFO L225 Difference]: With dead ends: 27 [2018-11-07 16:50:10,746 INFO L226 Difference]: Without dead ends: 18 [2018-11-07 16:50:10,747 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 1 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2018-11-07 16:50:10,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2018-11-07 16:50:10,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2018-11-07 16:50:10,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2018-11-07 16:50:10,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2018-11-07 16:50:10,754 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 11 [2018-11-07 16:50:10,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:10,754 INFO L480 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2018-11-07 16:50:10,755 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:50:10,755 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2018-11-07 16:50:10,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2018-11-07 16:50:10,756 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:10,756 INFO L375 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:10,756 INFO L423 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:10,757 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:10,757 INFO L82 PathProgramCache]: Analyzing trace with hash 1048902920, now seen corresponding path program 1 times [2018-11-07 16:50:10,757 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:10,758 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,758 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:10,759 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:10,759 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:10,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:11,013 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:11,014 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:11,014 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:11,015 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 16 with the following transitions: [2018-11-07 16:50:11,016 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-11-07 16:50:11,053 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:50:11,053 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:50:11,168 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:50:11,307 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:50:11,308 INFO L272 AbstractInterpreter]: Visited 14 different actions 78 times. Merged at 5 different actions 38 times. Widened at 1 different actions 4 times. Found 1 fixpoints after 1 different actions. Largest state had 4 variables. [2018-11-07 16:50:11,324 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:11,325 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:50:11,325 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:11,325 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:11,338 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:11,338 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:11,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:11,373 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:11,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:11,632 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:11,746 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:11,767 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:11,767 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4, 4] total 9 [2018-11-07 16:50:11,768 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:11,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2018-11-07 16:50:11,768 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2018-11-07 16:50:11,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:50:11,769 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 7 states. [2018-11-07 16:50:11,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:11,873 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2018-11-07 16:50:11,874 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2018-11-07 16:50:11,874 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 15 [2018-11-07 16:50:11,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:11,875 INFO L225 Difference]: With dead ends: 31 [2018-11-07 16:50:11,876 INFO L226 Difference]: Without dead ends: 22 [2018-11-07 16:50:11,877 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=26, Invalid=46, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:50:11,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2018-11-07 16:50:11,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2018-11-07 16:50:11,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2018-11-07 16:50:11,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2018-11-07 16:50:11,882 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 15 [2018-11-07 16:50:11,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:11,882 INFO L480 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2018-11-07 16:50:11,883 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2018-11-07 16:50:11,883 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2018-11-07 16:50:11,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2018-11-07 16:50:11,884 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:11,884 INFO L375 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:11,884 INFO L423 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:11,884 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:11,884 INFO L82 PathProgramCache]: Analyzing trace with hash 452778096, now seen corresponding path program 2 times [2018-11-07 16:50:11,885 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:11,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:11,886 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:11,886 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:11,886 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:11,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:12,203 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 8 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:12,204 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:12,204 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:12,204 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:12,205 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:12,205 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:12,205 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:12,216 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:12,216 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:12,238 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2018-11-07 16:50:12,238 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:12,241 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:12,550 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-11-07 16:50:12,550 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:12,750 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2018-11-07 16:50:12,783 INFO L312 seRefinementStrategy]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2018-11-07 16:50:12,783 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [6] total 14 [2018-11-07 16:50:12,783 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:50:12,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:50:12,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:50:12,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:50:12,784 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 6 states. [2018-11-07 16:50:13,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:13,280 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2018-11-07 16:50:13,281 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:50:13,281 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2018-11-07 16:50:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:13,282 INFO L225 Difference]: With dead ends: 30 [2018-11-07 16:50:13,282 INFO L226 Difference]: Without dead ends: 25 [2018-11-07 16:50:13,283 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2018-11-07 16:50:13,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2018-11-07 16:50:13,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2018-11-07 16:50:13,287 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2018-11-07 16:50:13,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 27 transitions. [2018-11-07 16:50:13,288 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 27 transitions. Word has length 19 [2018-11-07 16:50:13,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:13,289 INFO L480 AbstractCegarLoop]: Abstraction has 25 states and 27 transitions. [2018-11-07 16:50:13,289 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:50:13,289 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 27 transitions. [2018-11-07 16:50:13,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2018-11-07 16:50:13,290 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:13,290 INFO L375 BasicCegarLoop]: trace histogram [4, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:13,290 INFO L423 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:13,291 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:13,291 INFO L82 PathProgramCache]: Analyzing trace with hash 671507994, now seen corresponding path program 1 times [2018-11-07 16:50:13,291 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:13,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:13,292 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:13,292 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:13,293 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:13,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:13,430 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:13,430 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:13,431 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:13,431 INFO L200 CegarAbsIntRunner]: Running AI on error trace of length 24 with the following transitions: [2018-11-07 16:50:13,431 INFO L202 CegarAbsIntRunner]: [0], [4], [8], [12], [14], [17], [19], [21], [28], [31], [33], [39], [40], [41], [43] [2018-11-07 16:50:13,433 INFO L148 AbstractInterpreter]: Using domain PoormanAbstractDomain with backing domain CompoundDomain [CongruenceDomain, IntervalDomain] [2018-11-07 16:50:13,433 INFO L101 FixpointEngine]: Starting fixpoint engine with domain PoormanAbstractDomain (maxUnwinding=3, maxParallelStates=2) [2018-11-07 16:50:13,438 WARN L79 EvaluatorLogger]: Possible loss of precision. Operator ARITHMOD has no precise implementation. [2018-11-07 16:50:13,549 INFO L263 AbstractInterpreter]: Some error location(s) were reachable [2018-11-07 16:50:13,549 INFO L272 AbstractInterpreter]: Visited 15 different actions 88 times. Merged at 6 different actions 42 times. Widened at 1 different actions 4 times. Found 9 fixpoints after 4 different actions. Largest state had 5 variables. [2018-11-07 16:50:13,562 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:13,562 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: Unknown [2018-11-07 16:50:13,562 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:13,563 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 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:13,573 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:13,573 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:13,585 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:13,589 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:13,623 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:13,624 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:13,845 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:13,866 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:13,866 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 9 [2018-11-07 16:50:13,866 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:13,867 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2018-11-07 16:50:13,867 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2018-11-07 16:50:13,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:50:13,868 INFO L87 Difference]: Start difference. First operand 25 states and 27 transitions. Second operand 6 states. [2018-11-07 16:50:13,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:13,974 INFO L93 Difference]: Finished difference Result 39 states and 43 transitions. [2018-11-07 16:50:13,975 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2018-11-07 16:50:13,975 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2018-11-07 16:50:13,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:13,976 INFO L225 Difference]: With dead ends: 39 [2018-11-07 16:50:13,976 INFO L226 Difference]: Without dead ends: 30 [2018-11-07 16:50:13,977 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 43 SyntacticMatches, 2 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2018-11-07 16:50:13,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2018-11-07 16:50:13,981 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2018-11-07 16:50:13,982 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2018-11-07 16:50:13,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2018-11-07 16:50:13,983 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 23 [2018-11-07 16:50:13,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:13,983 INFO L480 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2018-11-07 16:50:13,983 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2018-11-07 16:50:13,984 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2018-11-07 16:50:13,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2018-11-07 16:50:13,985 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:13,985 INFO L375 BasicCegarLoop]: trace histogram [5, 4, 4, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:13,985 INFO L423 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:13,985 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:13,986 INFO L82 PathProgramCache]: Analyzing trace with hash 1681938818, now seen corresponding path program 2 times [2018-11-07 16:50:13,986 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:13,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:13,987 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:13,987 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:13,987 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:13,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:14,192 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:14,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:14,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:14,193 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:14,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:14,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:14,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:14,203 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:14,203 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:14,216 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 16:50:14,216 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:14,219 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:14,401 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:14,401 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:14,620 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:14,640 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:14,641 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2018-11-07 16:50:14,641 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:14,641 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2018-11-07 16:50:14,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2018-11-07 16:50:14,642 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=230, Unknown=0, NotChecked=0, Total=272 [2018-11-07 16:50:14,642 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 12 states. [2018-11-07 16:50:15,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:15,062 INFO L93 Difference]: Finished difference Result 50 states and 56 transitions. [2018-11-07 16:50:15,063 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2018-11-07 16:50:15,063 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2018-11-07 16:50:15,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:15,064 INFO L225 Difference]: With dead ends: 50 [2018-11-07 16:50:15,065 INFO L226 Difference]: Without dead ends: 38 [2018-11-07 16:50:15,066 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=87, Invalid=419, Unknown=0, NotChecked=0, Total=506 [2018-11-07 16:50:15,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2018-11-07 16:50:15,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2018-11-07 16:50:15,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2018-11-07 16:50:15,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2018-11-07 16:50:15,073 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 27 [2018-11-07 16:50:15,073 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:15,074 INFO L480 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2018-11-07 16:50:15,074 INFO L481 AbstractCegarLoop]: Interpolant automaton has 12 states. [2018-11-07 16:50:15,074 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2018-11-07 16:50:15,075 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2018-11-07 16:50:15,075 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:15,075 INFO L375 BasicCegarLoop]: trace histogram [7, 6, 6, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:15,075 INFO L423 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:15,075 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:15,076 INFO L82 PathProgramCache]: Analyzing trace with hash 1459820948, now seen corresponding path program 3 times [2018-11-07 16:50:15,076 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:15,076 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,077 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:15,077 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,077 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:15,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:15,330 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 17 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:15,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:15,331 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:15,331 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:15,331 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:15,331 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:15,332 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:15,351 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:50:15,352 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:50:15,371 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:50:15,372 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:15,374 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:15,399 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 33 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:50:15,399 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:15,637 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 33 proven. 36 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:50:15,660 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:15,660 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7, 7] total 14 [2018-11-07 16:50:15,660 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:15,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2018-11-07 16:50:15,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2018-11-07 16:50:15,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=116, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:50:15,662 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 9 states. [2018-11-07 16:50:15,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:15,877 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2018-11-07 16:50:15,879 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2018-11-07 16:50:15,880 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 35 [2018-11-07 16:50:15,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:15,881 INFO L225 Difference]: With dead ends: 59 [2018-11-07 16:50:15,881 INFO L226 Difference]: Without dead ends: 46 [2018-11-07 16:50:15,882 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 65 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=116, Unknown=0, NotChecked=0, Total=182 [2018-11-07 16:50:15,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2018-11-07 16:50:15,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2018-11-07 16:50:15,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2018-11-07 16:50:15,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 48 transitions. [2018-11-07 16:50:15,888 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 48 transitions. Word has length 35 [2018-11-07 16:50:15,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:15,889 INFO L480 AbstractCegarLoop]: Abstraction has 45 states and 48 transitions. [2018-11-07 16:50:15,889 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2018-11-07 16:50:15,889 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 48 transitions. [2018-11-07 16:50:15,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2018-11-07 16:50:15,890 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:15,890 INFO L375 BasicCegarLoop]: trace histogram [9, 8, 8, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:15,891 INFO L423 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:15,891 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:15,891 INFO L82 PathProgramCache]: Analyzing trace with hash -149334940, now seen corresponding path program 4 times [2018-11-07 16:50:15,891 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:15,892 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,892 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:15,893 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:15,893 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:15,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:16,192 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 23 proven. 105 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:16,193 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:16,193 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:16,193 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:16,193 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:16,194 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:16,194 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:16,202 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:16,203 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:16,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:16,223 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:16,245 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 47 proven. 78 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:50:16,245 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:16,419 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 47 proven. 78 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:50:16,439 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:16,439 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 9, 9] total 18 [2018-11-07 16:50:16,440 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:16,440 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2018-11-07 16:50:16,441 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2018-11-07 16:50:16,441 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:50:16,441 INFO L87 Difference]: Start difference. First operand 45 states and 48 transitions. Second operand 11 states. [2018-11-07 16:50:16,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:16,785 INFO L93 Difference]: Finished difference Result 67 states and 74 transitions. [2018-11-07 16:50:16,787 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2018-11-07 16:50:16,787 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 43 [2018-11-07 16:50:16,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:16,789 INFO L225 Difference]: With dead ends: 67 [2018-11-07 16:50:16,789 INFO L226 Difference]: Without dead ends: 54 [2018-11-07 16:50:16,790 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 79 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2018-11-07 16:50:16,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2018-11-07 16:50:16,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2018-11-07 16:50:16,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2018-11-07 16:50:16,796 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2018-11-07 16:50:16,797 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 43 [2018-11-07 16:50:16,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:16,797 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2018-11-07 16:50:16,797 INFO L481 AbstractCegarLoop]: Interpolant automaton has 11 states. [2018-11-07 16:50:16,798 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2018-11-07 16:50:16,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2018-11-07 16:50:16,799 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:16,799 INFO L375 BasicCegarLoop]: trace histogram [11, 10, 10, 8, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:16,799 INFO L423 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:16,799 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:16,799 INFO L82 PathProgramCache]: Analyzing trace with hash 435142452, now seen corresponding path program 5 times [2018-11-07 16:50:16,800 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:16,800 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:16,801 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:16,801 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:16,801 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:16,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:17,112 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 29 proven. 171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:17,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:17,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:17,113 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:17,113 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:17,113 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:17,113 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:17,122 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:17,123 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:17,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:50:17,139 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:17,142 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:17,465 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-07 16:50:17,465 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:18,117 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2018-11-07 16:50:18,151 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:18,151 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 9, 9] total 27 [2018-11-07 16:50:18,151 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:18,152 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2018-11-07 16:50:18,153 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2018-11-07 16:50:18,153 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=610, Unknown=0, NotChecked=0, Total=702 [2018-11-07 16:50:18,154 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 20 states. [2018-11-07 16:50:19,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:19,226 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2018-11-07 16:50:19,227 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2018-11-07 16:50:19,227 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 51 [2018-11-07 16:50:19,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:19,229 INFO L225 Difference]: With dead ends: 83 [2018-11-07 16:50:19,229 INFO L226 Difference]: Without dead ends: 67 [2018-11-07 16:50:19,231 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=207, Invalid=1275, Unknown=0, NotChecked=0, Total=1482 [2018-11-07 16:50:19,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2018-11-07 16:50:19,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 65. [2018-11-07 16:50:19,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2018-11-07 16:50:19,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 69 transitions. [2018-11-07 16:50:19,239 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 69 transitions. Word has length 51 [2018-11-07 16:50:19,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:19,239 INFO L480 AbstractCegarLoop]: Abstraction has 65 states and 69 transitions. [2018-11-07 16:50:19,240 INFO L481 AbstractCegarLoop]: Interpolant automaton has 20 states. [2018-11-07 16:50:19,240 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 69 transitions. [2018-11-07 16:50:19,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2018-11-07 16:50:19,241 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:19,241 INFO L375 BasicCegarLoop]: trace histogram [14, 13, 13, 10, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:19,241 INFO L423 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:19,242 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:19,242 INFO L82 PathProgramCache]: Analyzing trace with hash -1361248850, now seen corresponding path program 6 times [2018-11-07 16:50:19,242 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:19,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:19,243 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:19,243 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:19,243 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:19,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:19,565 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 38 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:19,565 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:19,565 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:19,566 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:19,566 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:19,566 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:19,566 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:19,577 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:50:19,578 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:50:19,600 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:50:19,600 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:19,605 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:19,644 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 118 proven. 210 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:50:19,644 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:22,271 INFO L134 CoverageAnalysis]: Checked inductivity of 338 backedges. 118 proven. 210 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:50:22,293 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:22,294 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 13] total 27 [2018-11-07 16:50:22,294 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:22,294 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2018-11-07 16:50:22,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2018-11-07 16:50:22,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=484, Unknown=0, NotChecked=0, Total=702 [2018-11-07 16:50:22,295 INFO L87 Difference]: Start difference. First operand 65 states and 69 transitions. Second operand 16 states. [2018-11-07 16:50:22,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:22,996 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2018-11-07 16:50:22,997 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2018-11-07 16:50:22,997 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 63 [2018-11-07 16:50:22,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:22,998 INFO L225 Difference]: With dead ends: 95 [2018-11-07 16:50:22,999 INFO L226 Difference]: Without dead ends: 78 [2018-11-07 16:50:23,000 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=218, Invalid=484, Unknown=0, NotChecked=0, Total=702 [2018-11-07 16:50:23,000 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2018-11-07 16:50:23,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2018-11-07 16:50:23,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2018-11-07 16:50:23,011 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 81 transitions. [2018-11-07 16:50:23,011 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 81 transitions. Word has length 63 [2018-11-07 16:50:23,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:23,011 INFO L480 AbstractCegarLoop]: Abstraction has 77 states and 81 transitions. [2018-11-07 16:50:23,011 INFO L481 AbstractCegarLoop]: Interpolant automaton has 16 states. [2018-11-07 16:50:23,012 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 81 transitions. [2018-11-07 16:50:23,013 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2018-11-07 16:50:23,013 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:23,013 INFO L375 BasicCegarLoop]: trace histogram [17, 16, 16, 13, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:23,013 INFO L423 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:23,013 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:23,013 INFO L82 PathProgramCache]: Analyzing trace with hash -1880071194, now seen corresponding path program 7 times [2018-11-07 16:50:23,014 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:23,014 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:23,014 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:23,015 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:23,015 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:23,026 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:23,422 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 47 proven. 465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:23,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:23,423 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:23,423 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:23,423 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:23,423 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:23,424 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:23,434 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:23,435 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:23,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:23,476 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:23,572 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 151 proven. 351 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:50:23,572 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:24,205 INFO L134 CoverageAnalysis]: Checked inductivity of 512 backedges. 151 proven. 351 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2018-11-07 16:50:24,229 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:24,229 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16, 16] total 33 [2018-11-07 16:50:24,229 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:24,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2018-11-07 16:50:24,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2018-11-07 16:50:24,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=739, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 16:50:24,231 INFO L87 Difference]: Start difference. First operand 77 states and 81 transitions. Second operand 19 states. [2018-11-07 16:50:24,961 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:24,961 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2018-11-07 16:50:24,961 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2018-11-07 16:50:24,962 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 75 [2018-11-07 16:50:24,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:24,963 INFO L225 Difference]: With dead ends: 107 [2018-11-07 16:50:24,964 INFO L226 Difference]: Without dead ends: 90 [2018-11-07 16:50:24,965 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 136 SyntacticMatches, 2 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=317, Invalid=739, Unknown=0, NotChecked=0, Total=1056 [2018-11-07 16:50:24,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2018-11-07 16:50:24,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2018-11-07 16:50:24,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2018-11-07 16:50:24,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 93 transitions. [2018-11-07 16:50:24,973 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 93 transitions. Word has length 75 [2018-11-07 16:50:24,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:24,973 INFO L480 AbstractCegarLoop]: Abstraction has 89 states and 93 transitions. [2018-11-07 16:50:24,973 INFO L481 AbstractCegarLoop]: Interpolant automaton has 19 states. [2018-11-07 16:50:24,973 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 93 transitions. [2018-11-07 16:50:24,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2018-11-07 16:50:24,974 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:24,975 INFO L375 BasicCegarLoop]: trace histogram [20, 19, 19, 16, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:24,975 INFO L423 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:24,975 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:24,975 INFO L82 PathProgramCache]: Analyzing trace with hash -842779106, now seen corresponding path program 8 times [2018-11-07 16:50:24,975 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:24,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:24,976 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:24,976 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:24,977 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:24,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:25,482 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 56 proven. 666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:25,482 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:25,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:25,483 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:25,483 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:25,483 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:25,483 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:25,492 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:25,492 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:50:25,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2018-11-07 16:50:25,510 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:25,514 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:25,793 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 194 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2018-11-07 16:50:25,793 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:26,347 INFO L134 CoverageAnalysis]: Checked inductivity of 722 backedges. 0 proven. 194 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2018-11-07 16:50:26,368 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:26,368 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 9, 9] total 36 [2018-11-07 16:50:26,368 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:26,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2018-11-07 16:50:26,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2018-11-07 16:50:26,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1153, Unknown=0, NotChecked=0, Total=1260 [2018-11-07 16:50:26,370 INFO L87 Difference]: Start difference. First operand 89 states and 93 transitions. Second operand 29 states. [2018-11-07 16:50:29,001 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:29,001 INFO L93 Difference]: Finished difference Result 126 states and 138 transitions. [2018-11-07 16:50:29,002 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2018-11-07 16:50:29,002 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 87 [2018-11-07 16:50:29,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:29,004 INFO L225 Difference]: With dead ends: 126 [2018-11-07 16:50:29,004 INFO L226 Difference]: Without dead ends: 106 [2018-11-07 16:50:29,006 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 161 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 239 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=312, Invalid=2880, Unknown=0, NotChecked=0, Total=3192 [2018-11-07 16:50:29,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2018-11-07 16:50:29,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2018-11-07 16:50:29,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2018-11-07 16:50:29,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 110 transitions. [2018-11-07 16:50:29,017 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 110 transitions. Word has length 87 [2018-11-07 16:50:29,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:29,017 INFO L480 AbstractCegarLoop]: Abstraction has 105 states and 110 transitions. [2018-11-07 16:50:29,017 INFO L481 AbstractCegarLoop]: Interpolant automaton has 29 states. [2018-11-07 16:50:29,017 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 110 transitions. [2018-11-07 16:50:29,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2018-11-07 16:50:29,019 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:29,019 INFO L375 BasicCegarLoop]: trace histogram [24, 23, 23, 19, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:29,019 INFO L423 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:29,019 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:29,020 INFO L82 PathProgramCache]: Analyzing trace with hash 2089000704, now seen corresponding path program 9 times [2018-11-07 16:50:29,020 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:29,020 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:29,021 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:29,021 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:29,021 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:29,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:30,146 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 68 proven. 990 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:30,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:30,147 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:30,147 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:30,147 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:30,147 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:30,148 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:30,156 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:50:30,156 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:50:30,177 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:50:30,177 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:50:30,181 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:30,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 296 proven. 741 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:30,272 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:31,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 296 proven. 741 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:31,378 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:31,378 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 22, 22] total 46 [2018-11-07 16:50:31,378 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:31,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2018-11-07 16:50:31,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2018-11-07 16:50:31,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=592, Invalid=1478, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:50:31,380 INFO L87 Difference]: Start difference. First operand 105 states and 110 transitions. Second operand 26 states. [2018-11-07 16:50:32,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:32,440 INFO L93 Difference]: Finished difference Result 143 states and 156 transitions. [2018-11-07 16:50:32,440 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2018-11-07 16:50:32,441 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 103 [2018-11-07 16:50:32,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:32,443 INFO L225 Difference]: With dead ends: 143 [2018-11-07 16:50:32,443 INFO L226 Difference]: Without dead ends: 122 [2018-11-07 16:50:32,444 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 186 SyntacticMatches, 2 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=592, Invalid=1478, Unknown=0, NotChecked=0, Total=2070 [2018-11-07 16:50:32,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2018-11-07 16:50:32,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2018-11-07 16:50:32,450 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2018-11-07 16:50:32,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 126 transitions. [2018-11-07 16:50:32,452 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 126 transitions. Word has length 103 [2018-11-07 16:50:32,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:32,452 INFO L480 AbstractCegarLoop]: Abstraction has 121 states and 126 transitions. [2018-11-07 16:50:32,453 INFO L481 AbstractCegarLoop]: Interpolant automaton has 26 states. [2018-11-07 16:50:32,453 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 126 transitions. [2018-11-07 16:50:32,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2018-11-07 16:50:32,454 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:32,454 INFO L375 BasicCegarLoop]: trace histogram [28, 27, 27, 23, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:32,455 INFO L423 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:32,455 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:32,455 INFO L82 PathProgramCache]: Analyzing trace with hash -303598432, now seen corresponding path program 10 times [2018-11-07 16:50:32,455 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:32,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:32,456 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:50:32,456 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:32,456 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:32,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:33,741 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 80 proven. 1378 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:33,741 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:33,741 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:33,742 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:33,742 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:33,742 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:33,742 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:33,750 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:33,750 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:50:33,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:33,774 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:50:33,811 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 1081 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:33,811 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:50:35,805 INFO L134 CoverageAnalysis]: Checked inductivity of 1458 backedges. 356 proven. 1081 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2018-11-07 16:50:35,841 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:50:35,841 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 26, 26] total 54 [2018-11-07 16:50:35,841 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:50:35,842 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2018-11-07 16:50:35,842 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2018-11-07 16:50:35,843 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=804, Invalid=2058, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 16:50:35,845 INFO L87 Difference]: Start difference. First operand 121 states and 126 transitions. Second operand 30 states. [2018-11-07 16:50:37,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:50:37,600 INFO L93 Difference]: Finished difference Result 159 states and 172 transitions. [2018-11-07 16:50:37,601 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2018-11-07 16:50:37,601 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 119 [2018-11-07 16:50:37,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:50:37,602 INFO L225 Difference]: With dead ends: 159 [2018-11-07 16:50:37,602 INFO L226 Difference]: Without dead ends: 138 [2018-11-07 16:50:37,603 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 214 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=804, Invalid=2058, Unknown=0, NotChecked=0, Total=2862 [2018-11-07 16:50:37,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2018-11-07 16:50:37,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 137. [2018-11-07 16:50:37,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 137 states. [2018-11-07 16:50:37,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 142 transitions. [2018-11-07 16:50:37,611 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 142 transitions. Word has length 119 [2018-11-07 16:50:37,611 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:50:37,612 INFO L480 AbstractCegarLoop]: Abstraction has 137 states and 142 transitions. [2018-11-07 16:50:37,612 INFO L481 AbstractCegarLoop]: Interpolant automaton has 30 states. [2018-11-07 16:50:37,612 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 142 transitions. [2018-11-07 16:50:37,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2018-11-07 16:50:37,614 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:50:37,614 INFO L375 BasicCegarLoop]: trace histogram [32, 31, 31, 27, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:50:37,614 INFO L423 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:50:37,614 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:50:37,614 INFO L82 PathProgramCache]: Analyzing trace with hash -114554304, now seen corresponding path program 11 times [2018-11-07 16:50:37,614 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:50:37,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:37,615 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:50:37,615 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:50:37,615 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:50:37,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:50:38,712 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 92 proven. 1830 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:50:38,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:38,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:50:38,713 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:50:38,713 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:50:38,713 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:50:38,713 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:50:38,722 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:50:38,722 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:51:26,782 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2018-11-07 16:51:26,782 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:51:27,017 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:51:27,993 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 437 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2018-11-07 16:51:27,993 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:51:55,815 INFO L134 CoverageAnalysis]: Checked inductivity of 1922 backedges. 0 proven. 326 refuted. 111 times theorem prover too weak. 1485 trivial. 0 not checked. [2018-11-07 16:51:55,819 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:51:55,819 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 13, 13] total 56 [2018-11-07 16:51:55,819 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:51:55,820 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2018-11-07 16:51:55,820 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2018-11-07 16:51:55,821 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=2853, Unknown=11, NotChecked=0, Total=3080 [2018-11-07 16:51:55,821 INFO L87 Difference]: Start difference. First operand 137 states and 142 transitions. Second operand 45 states. [2018-11-07 16:52:00,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:52:00,396 INFO L93 Difference]: Finished difference Result 193 states and 210 transitions. [2018-11-07 16:52:00,396 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2018-11-07 16:52:00,396 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 135 [2018-11-07 16:52:00,397 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:52:00,400 INFO L225 Difference]: With dead ends: 193 [2018-11-07 16:52:00,400 INFO L226 Difference]: Without dead ends: 169 [2018-11-07 16:52:00,403 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 337 GetRequests, 249 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 590 ImplicationChecksByTransitivity, 30.9s TimeCoverageRelationStatistics Valid=670, Invalid=7151, Unknown=11, NotChecked=0, Total=7832 [2018-11-07 16:52:00,404 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2018-11-07 16:52:00,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 164. [2018-11-07 16:52:00,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 164 states. [2018-11-07 16:52:00,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 171 transitions. [2018-11-07 16:52:00,414 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 171 transitions. Word has length 135 [2018-11-07 16:52:00,415 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:52:00,415 INFO L480 AbstractCegarLoop]: Abstraction has 164 states and 171 transitions. [2018-11-07 16:52:00,415 INFO L481 AbstractCegarLoop]: Interpolant automaton has 45 states. [2018-11-07 16:52:00,415 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 171 transitions. [2018-11-07 16:52:00,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 156 [2018-11-07 16:52:00,418 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:52:00,418 INFO L375 BasicCegarLoop]: trace histogram [37, 36, 36, 31, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:52:00,418 INFO L423 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:52:00,419 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:52:00,419 INFO L82 PathProgramCache]: Analyzing trace with hash -1133922934, now seen corresponding path program 12 times [2018-11-07 16:52:00,419 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:52:00,419 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:00,420 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:52:00,420 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:00,420 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:52:00,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:01,387 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 107 proven. 2485 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:52:01,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:01,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:52:01,388 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:52:01,388 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:52:01,388 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:01,388 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:52:01,397 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:52:01,397 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:52:01,443 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:52:01,444 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:52:01,447 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:52:01,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 603 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:52:01,519 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:52:04,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2592 backedges. 603 proven. 1953 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:52:04,497 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:52:04,497 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 34, 34] total 71 [2018-11-07 16:52:04,497 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:52:04,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2018-11-07 16:52:04,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2018-11-07 16:52:04,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1359, Invalid=3611, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 16:52:04,501 INFO L87 Difference]: Start difference. First operand 164 states and 171 transitions. Second operand 39 states. [2018-11-07 16:52:07,159 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:52:07,159 INFO L93 Difference]: Finished difference Result 217 states and 235 transitions. [2018-11-07 16:52:07,160 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2018-11-07 16:52:07,160 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 155 [2018-11-07 16:52:07,160 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:52:07,162 INFO L225 Difference]: With dead ends: 217 [2018-11-07 16:52:07,162 INFO L226 Difference]: Without dead ends: 185 [2018-11-07 16:52:07,164 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 349 GetRequests, 278 SyntacticMatches, 2 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=1359, Invalid=3611, Unknown=0, NotChecked=0, Total=4970 [2018-11-07 16:52:07,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2018-11-07 16:52:07,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 184. [2018-11-07 16:52:07,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2018-11-07 16:52:07,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 191 transitions. [2018-11-07 16:52:07,172 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 191 transitions. Word has length 155 [2018-11-07 16:52:07,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:52:07,172 INFO L480 AbstractCegarLoop]: Abstraction has 184 states and 191 transitions. [2018-11-07 16:52:07,172 INFO L481 AbstractCegarLoop]: Interpolant automaton has 39 states. [2018-11-07 16:52:07,172 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 191 transitions. [2018-11-07 16:52:07,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 176 [2018-11-07 16:52:07,175 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:52:07,175 INFO L375 BasicCegarLoop]: trace histogram [42, 41, 41, 36, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:52:07,175 INFO L423 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:52:07,175 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:52:07,176 INFO L82 PathProgramCache]: Analyzing trace with hash -718034286, now seen corresponding path program 13 times [2018-11-07 16:52:07,176 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:52:07,176 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:07,176 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:52:07,177 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:07,177 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:52:07,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:08,321 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 122 proven. 3240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:52:08,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:08,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:52:08,322 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:52:08,322 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:52:08,322 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:08,322 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:52:08,330 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:52:08,330 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:52:08,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:08,369 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:52:08,455 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 2628 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:52:08,455 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:52:11,683 INFO L134 CoverageAnalysis]: Checked inductivity of 3362 backedges. 698 proven. 2628 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:52:11,702 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:52:11,702 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 39, 39] total 81 [2018-11-07 16:52:11,703 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:52:11,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2018-11-07 16:52:11,703 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2018-11-07 16:52:11,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1754, Invalid=4726, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 16:52:11,705 INFO L87 Difference]: Start difference. First operand 184 states and 191 transitions. Second operand 44 states. [2018-11-07 16:52:14,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:52:14,949 INFO L93 Difference]: Finished difference Result 237 states and 255 transitions. [2018-11-07 16:52:14,949 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2018-11-07 16:52:14,950 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 175 [2018-11-07 16:52:14,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:52:14,951 INFO L225 Difference]: With dead ends: 237 [2018-11-07 16:52:14,952 INFO L226 Difference]: Without dead ends: 205 [2018-11-07 16:52:14,954 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 394 GetRequests, 313 SyntacticMatches, 2 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=1754, Invalid=4726, Unknown=0, NotChecked=0, Total=6480 [2018-11-07 16:52:14,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 205 states. [2018-11-07 16:52:14,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 205 to 204. [2018-11-07 16:52:14,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 204 states. [2018-11-07 16:52:14,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 204 states to 204 states and 211 transitions. [2018-11-07 16:52:14,961 INFO L78 Accepts]: Start accepts. Automaton has 204 states and 211 transitions. Word has length 175 [2018-11-07 16:52:14,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:52:14,961 INFO L480 AbstractCegarLoop]: Abstraction has 204 states and 211 transitions. [2018-11-07 16:52:14,962 INFO L481 AbstractCegarLoop]: Interpolant automaton has 44 states. [2018-11-07 16:52:14,962 INFO L276 IsEmpty]: Start isEmpty. Operand 204 states and 211 transitions. [2018-11-07 16:52:14,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2018-11-07 16:52:14,963 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:52:14,963 INFO L375 BasicCegarLoop]: trace histogram [47, 46, 46, 41, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:52:14,963 INFO L423 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:52:14,963 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:52:14,964 INFO L82 PathProgramCache]: Analyzing trace with hash 2000210842, now seen corresponding path program 14 times [2018-11-07 16:52:14,964 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:52:14,964 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:14,964 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:52:14,965 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:52:14,965 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:52:14,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:52:16,567 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 137 proven. 4095 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:52:16,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:16,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:52:16,568 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:52:16,568 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:52:16,568 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:52:16,568 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:52:16,577 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:52:16,577 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:52:50,375 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2018-11-07 16:52:50,375 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:52:50,486 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:52:50,981 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 829 refuted. 0 times theorem prover too weak. 3403 trivial. 0 not checked. [2018-11-07 16:52:50,981 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:52:52,408 INFO L134 CoverageAnalysis]: Checked inductivity of 4232 backedges. 0 proven. 829 refuted. 0 times theorem prover too weak. 3403 trivial. 0 not checked. [2018-11-07 16:52:52,444 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:52:52,444 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 11, 11] total 67 [2018-11-07 16:52:52,444 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:52:52,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2018-11-07 16:52:52,445 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2018-11-07 16:52:52,447 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=4206, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 16:52:52,447 INFO L87 Difference]: Start difference. First operand 204 states and 211 transitions. Second operand 58 states. [2018-11-07 16:53:00,596 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:00,596 INFO L93 Difference]: Finished difference Result 269 states and 291 transitions. [2018-11-07 16:53:00,596 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2018-11-07 16:53:00,597 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 195 [2018-11-07 16:53:00,597 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:00,600 INFO L225 Difference]: With dead ends: 269 [2018-11-07 16:53:00,600 INFO L226 Difference]: Without dead ends: 234 [2018-11-07 16:53:00,601 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 373 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1167 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=785, Invalid=12325, Unknown=0, NotChecked=0, Total=13110 [2018-11-07 16:53:00,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2018-11-07 16:53:00,608 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 232. [2018-11-07 16:53:00,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2018-11-07 16:53:00,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 242 transitions. [2018-11-07 16:53:00,610 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 242 transitions. Word has length 195 [2018-11-07 16:53:00,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:00,610 INFO L480 AbstractCegarLoop]: Abstraction has 232 states and 242 transitions. [2018-11-07 16:53:00,610 INFO L481 AbstractCegarLoop]: Interpolant automaton has 58 states. [2018-11-07 16:53:00,610 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 242 transitions. [2018-11-07 16:53:00,612 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 216 [2018-11-07 16:53:00,612 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:00,612 INFO L375 BasicCegarLoop]: trace histogram [52, 51, 51, 47, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:00,612 INFO L423 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:00,612 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:00,612 INFO L82 PathProgramCache]: Analyzing trace with hash -789745056, now seen corresponding path program 15 times [2018-11-07 16:53:00,613 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:00,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:00,613 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:53:00,613 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:00,614 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:00,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:02,298 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 348 proven. 4851 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:53:02,298 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:02,298 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:02,298 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:02,299 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:02,299 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:02,299 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:53:02,308 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:53:02,309 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:53:02,352 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:53:02,352 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:53:02,356 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:02,459 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 888 proven. 4278 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:02,459 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:07,403 INFO L134 CoverageAnalysis]: Checked inductivity of 5202 backedges. 888 proven. 4278 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:07,422 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:07,423 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 49, 49] total 100 [2018-11-07 16:53:07,423 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:07,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2018-11-07 16:53:07,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2018-11-07 16:53:07,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=2644, Invalid=7256, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 16:53:07,425 INFO L87 Difference]: Start difference. First operand 232 states and 242 transitions. Second operand 53 states. [2018-11-07 16:53:12,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:12,270 INFO L93 Difference]: Finished difference Result 289 states and 312 transitions. [2018-11-07 16:53:12,271 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2018-11-07 16:53:12,271 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 215 [2018-11-07 16:53:12,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:12,273 INFO L225 Difference]: With dead ends: 289 [2018-11-07 16:53:12,273 INFO L226 Difference]: Without dead ends: 249 [2018-11-07 16:53:12,273 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 483 GetRequests, 383 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=2644, Invalid=7256, Unknown=0, NotChecked=0, Total=9900 [2018-11-07 16:53:12,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2018-11-07 16:53:12,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 248. [2018-11-07 16:53:12,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2018-11-07 16:53:12,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 258 transitions. [2018-11-07 16:53:12,282 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 258 transitions. Word has length 215 [2018-11-07 16:53:12,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:12,283 INFO L480 AbstractCegarLoop]: Abstraction has 248 states and 258 transitions. [2018-11-07 16:53:12,283 INFO L481 AbstractCegarLoop]: Interpolant automaton has 53 states. [2018-11-07 16:53:12,283 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 258 transitions. [2018-11-07 16:53:12,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 232 [2018-11-07 16:53:12,284 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:12,284 INFO L375 BasicCegarLoop]: trace histogram [56, 55, 55, 51, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:12,285 INFO L423 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:12,285 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:12,285 INFO L82 PathProgramCache]: Analyzing trace with hash 536250368, now seen corresponding path program 16 times [2018-11-07 16:53:12,285 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:12,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:12,286 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:53:12,286 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:12,286 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:12,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:14,370 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 376 proven. 5671 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:53:14,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:14,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:14,370 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:14,370 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:14,370 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:14,370 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:53:14,380 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:53:14,380 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:53:14,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:14,432 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:14,565 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 964 proven. 5050 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:14,565 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:20,273 INFO L134 CoverageAnalysis]: Checked inductivity of 6050 backedges. 964 proven. 5050 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:20,292 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:20,292 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [57, 53, 53] total 108 [2018-11-07 16:53:20,292 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:20,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2018-11-07 16:53:20,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2018-11-07 16:53:20,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3072, Invalid=8484, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 16:53:20,294 INFO L87 Difference]: Start difference. First operand 248 states and 258 transitions. Second operand 57 states. [2018-11-07 16:53:25,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:25,896 INFO L93 Difference]: Finished difference Result 305 states and 328 transitions. [2018-11-07 16:53:25,896 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2018-11-07 16:53:25,896 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 231 [2018-11-07 16:53:25,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:25,898 INFO L225 Difference]: With dead ends: 305 [2018-11-07 16:53:25,898 INFO L226 Difference]: Without dead ends: 265 [2018-11-07 16:53:25,899 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 411 SyntacticMatches, 2 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=3072, Invalid=8484, Unknown=0, NotChecked=0, Total=11556 [2018-11-07 16:53:25,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2018-11-07 16:53:25,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 264. [2018-11-07 16:53:25,907 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 264 states. [2018-11-07 16:53:25,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 264 states to 264 states and 274 transitions. [2018-11-07 16:53:25,908 INFO L78 Accepts]: Start accepts. Automaton has 264 states and 274 transitions. Word has length 231 [2018-11-07 16:53:25,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:25,909 INFO L480 AbstractCegarLoop]: Abstraction has 264 states and 274 transitions. [2018-11-07 16:53:25,909 INFO L481 AbstractCegarLoop]: Interpolant automaton has 57 states. [2018-11-07 16:53:25,909 INFO L276 IsEmpty]: Start isEmpty. Operand 264 states and 274 transitions. [2018-11-07 16:53:25,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 16:53:25,910 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:25,910 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 55, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:25,911 INFO L423 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:25,911 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:25,911 INFO L82 PathProgramCache]: Analyzing trace with hash -1772069472, now seen corresponding path program 17 times [2018-11-07 16:53:25,911 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:25,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:25,912 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:53:25,912 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:25,912 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:25,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:27,956 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 404 proven. 6555 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2018-11-07 16:53:27,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:27,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:27,957 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:27,957 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:27,957 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:27,957 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode Z3_IG No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true -t:12000 [2018-11-07 16:53:27,967 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:53:27,967 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:53:27,986 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2018-11-07 16:53:27,986 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:53:27,989 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:28,264 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 176 proven. 0 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-11-07 16:53:28,265 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:29,649 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 0 proven. 176 refuted. 0 times theorem prover too weak. 6786 trivial. 0 not checked. [2018-11-07 16:53:29,687 INFO L312 seRefinementStrategy]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2018-11-07 16:53:29,687 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [5] imperfect sequences [61, 5] total 67 [2018-11-07 16:53:29,687 INFO L258 anRefinementStrategy]: Using the first perfect interpolant sequence [2018-11-07 16:53:29,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2018-11-07 16:53:29,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2018-11-07 16:53:29,688 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=198, Invalid=4224, Unknown=0, NotChecked=0, Total=4422 [2018-11-07 16:53:29,688 INFO L87 Difference]: Start difference. First operand 264 states and 274 transitions. Second operand 5 states. [2018-11-07 16:53:29,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:29,817 INFO L93 Difference]: Finished difference Result 299 states and 315 transitions. [2018-11-07 16:53:29,818 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2018-11-07 16:53:29,818 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 247 [2018-11-07 16:53:29,819 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:29,821 INFO L225 Difference]: With dead ends: 299 [2018-11-07 16:53:29,821 INFO L226 Difference]: Without dead ends: 294 [2018-11-07 16:53:29,822 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 489 SyntacticMatches, 1 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=206, Invalid=4350, Unknown=0, NotChecked=0, Total=4556 [2018-11-07 16:53:29,822 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 294 states. [2018-11-07 16:53:29,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 294 to 263. [2018-11-07 16:53:29,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 263 states. [2018-11-07 16:53:29,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 272 transitions. [2018-11-07 16:53:29,831 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 272 transitions. Word has length 247 [2018-11-07 16:53:29,832 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:29,832 INFO L480 AbstractCegarLoop]: Abstraction has 263 states and 272 transitions. [2018-11-07 16:53:29,832 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2018-11-07 16:53:29,832 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 272 transitions. [2018-11-07 16:53:29,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 248 [2018-11-07 16:53:29,834 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:29,834 INFO L375 BasicCegarLoop]: trace histogram [60, 59, 59, 55, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:29,834 INFO L423 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:29,835 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:29,835 INFO L82 PathProgramCache]: Analyzing trace with hash -704557408, now seen corresponding path program 18 times [2018-11-07 16:53:29,835 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:29,835 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:29,836 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:53:29,836 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:29,836 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:29,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:31,986 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 176 proven. 6786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:53:31,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:31,987 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:31,987 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:31,987 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:31,987 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:31,987 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 16:53:31,995 INFO L103 rtionOrderModulation]: Keeping assertion order TERMS_WITH_SMALL_CONSTANTS_FIRST [2018-11-07 16:53:31,996 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder TERMS_WITH_SMALL_CONSTANTS_FIRST (IT: FPandBP) [2018-11-07 16:53:32,048 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2018-11-07 16:53:32,049 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:53:32,054 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:32,155 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1040 proven. 5886 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:32,155 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:38,674 INFO L134 CoverageAnalysis]: Checked inductivity of 6962 backedges. 1040 proven. 5886 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:38,694 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:38,695 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 57, 57] total 117 [2018-11-07 16:53:38,695 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:38,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2018-11-07 16:53:38,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2018-11-07 16:53:38,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3590, Invalid=9982, Unknown=0, NotChecked=0, Total=13572 [2018-11-07 16:53:38,696 INFO L87 Difference]: Start difference. First operand 263 states and 272 transitions. Second operand 62 states. [2018-11-07 16:53:45,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:53:45,565 INFO L93 Difference]: Finished difference Result 323 states and 345 transitions. [2018-11-07 16:53:45,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2018-11-07 16:53:45,569 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 247 [2018-11-07 16:53:45,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:53:45,570 INFO L225 Difference]: With dead ends: 323 [2018-11-07 16:53:45,571 INFO L226 Difference]: Without dead ends: 284 [2018-11-07 16:53:45,571 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 556 GetRequests, 439 SyntacticMatches, 2 SemanticMatches, 115 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=3590, Invalid=9982, Unknown=0, NotChecked=0, Total=13572 [2018-11-07 16:53:45,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2018-11-07 16:53:45,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 283. [2018-11-07 16:53:45,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 283 states. [2018-11-07 16:53:45,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 292 transitions. [2018-11-07 16:53:45,582 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 292 transitions. Word has length 247 [2018-11-07 16:53:45,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:53:45,583 INFO L480 AbstractCegarLoop]: Abstraction has 283 states and 292 transitions. [2018-11-07 16:53:45,583 INFO L481 AbstractCegarLoop]: Interpolant automaton has 62 states. [2018-11-07 16:53:45,583 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 292 transitions. [2018-11-07 16:53:45,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2018-11-07 16:53:45,585 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:53:45,585 INFO L375 BasicCegarLoop]: trace histogram [65, 64, 64, 60, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:53:45,585 INFO L423 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:53:45,585 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:53:45,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1137924184, now seen corresponding path program 19 times [2018-11-07 16:53:45,586 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:53:45,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:45,586 INFO L101 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2018-11-07 16:53:45,586 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:53:45,587 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:53:45,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:48,176 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 191 proven. 8001 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:53:48,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:48,177 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:53:48,177 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:53:48,177 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:53:48,177 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:53:48,177 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 16:53:48,185 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:53:48,185 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: FPandBP) [2018-11-07 16:53:48,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:53:48,240 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:53:48,398 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 1135 proven. 7021 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:48,398 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:53:56,110 INFO L134 CoverageAnalysis]: Checked inductivity of 8192 backedges. 1135 proven. 7021 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2018-11-07 16:53:56,130 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:53:56,130 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 62, 62] total 127 [2018-11-07 16:53:56,131 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:53:56,131 INFO L459 AbstractCegarLoop]: Interpolant automaton has 67 states [2018-11-07 16:53:56,132 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2018-11-07 16:53:56,132 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4215, Invalid=11787, Unknown=0, NotChecked=0, Total=16002 [2018-11-07 16:53:56,132 INFO L87 Difference]: Start difference. First operand 283 states and 292 transitions. Second operand 67 states. [2018-11-07 16:54:05,131 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2018-11-07 16:54:05,131 INFO L93 Difference]: Finished difference Result 343 states and 365 transitions. [2018-11-07 16:54:05,139 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2018-11-07 16:54:05,139 INFO L78 Accepts]: Start accepts. Automaton has 67 states. Word has length 267 [2018-11-07 16:54:05,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2018-11-07 16:54:05,141 INFO L225 Difference]: With dead ends: 343 [2018-11-07 16:54:05,141 INFO L226 Difference]: Without dead ends: 304 [2018-11-07 16:54:05,142 INFO L604 BasicCegarLoop]: 0 DeclaredPredicates, 601 GetRequests, 474 SyntacticMatches, 2 SemanticMatches, 125 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=4215, Invalid=11787, Unknown=0, NotChecked=0, Total=16002 [2018-11-07 16:54:05,142 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2018-11-07 16:54:05,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 303. [2018-11-07 16:54:05,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 303 states. [2018-11-07 16:54:05,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 312 transitions. [2018-11-07 16:54:05,153 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 312 transitions. Word has length 267 [2018-11-07 16:54:05,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2018-11-07 16:54:05,154 INFO L480 AbstractCegarLoop]: Abstraction has 303 states and 312 transitions. [2018-11-07 16:54:05,154 INFO L481 AbstractCegarLoop]: Interpolant automaton has 67 states. [2018-11-07 16:54:05,154 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 312 transitions. [2018-11-07 16:54:05,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 288 [2018-11-07 16:54:05,156 INFO L367 BasicCegarLoop]: Found error trace [2018-11-07 16:54:05,156 INFO L375 BasicCegarLoop]: trace histogram [70, 69, 69, 65, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2018-11-07 16:54:05,156 INFO L423 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2018-11-07 16:54:05,156 INFO L141 PredicateUnifier]: Initialized classic predicate unifier [2018-11-07 16:54:05,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1895378096, now seen corresponding path program 20 times [2018-11-07 16:54:05,157 INFO L69 tionRefinementEngine]: Using refinement strategy TaipanRefinementStrategy [2018-11-07 16:54:05,157 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:54:05,157 INFO L103 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2018-11-07 16:54:05,158 INFO L119 rtionOrderModulation]: Craig_TreeInterpolation forces the order to NOT_INCREMENTALLY [2018-11-07 16:54:05,158 INFO L288 anRefinementStrategy]: Using traceCheck mode SMTINTERPOL with AssertCodeBlockOrder NOT_INCREMENTALLY (IT: Craig_TreeInterpolation) [2018-11-07 16:54:05,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2018-11-07 16:54:08,539 INFO L134 CoverageAnalysis]: Checked inductivity of 9522 backedges. 206 proven. 9316 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2018-11-07 16:54:08,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:54:08,539 INFO L194 anRefinementStrategy]: Switched to InterpolantGenerator mode ABSTRACT_INTERPRETATION [2018-11-07 16:54:08,539 INFO L184 CegarAbsIntRunner]: Skipping current iteration for AI because we have already analyzed this path program [2018-11-07 16:54:08,539 INFO L422 seRefinementStrategy]: Interpolation failed due to KNOWN_IGNORE: AbsInt can only provide a hoare triple checker if it generated fixpoints [2018-11-07 16:54:08,539 INFO L300 seRefinementStrategy]: The current sequences of interpolants are not accepted, trying to find more. [2018-11-07 16:54:08,539 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 16:54:08,548 INFO L103 rtionOrderModulation]: Keeping assertion order OUTSIDE_LOOP_FIRST2 [2018-11-07 16:54:08,548 INFO L288 anRefinementStrategy]: Using traceCheck mode Z3_IG with AssertCodeBlockOrder OUTSIDE_LOOP_FIRST2 (IT: FPandBP) [2018-11-07 16:54:08,577 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2018-11-07 16:54:08,578 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2018-11-07 16:54:08,581 INFO L273 TraceCheckSpWp]: Computing forward predicates... [2018-11-07 16:54:08,984 INFO L134 CoverageAnalysis]: Checked inductivity of 9522 backedges. 474 proven. 3 refuted. 0 times theorem prover too weak. 9045 trivial. 0 not checked. [2018-11-07 16:54:08,984 INFO L316 TraceCheckSpWp]: Computing backward predicates... [2018-11-07 16:54:09,908 INFO L134 CoverageAnalysis]: Checked inductivity of 9522 backedges. 0 proven. 477 refuted. 0 times theorem prover too weak. 9045 trivial. 0 not checked. [2018-11-07 16:54:09,928 INFO L312 seRefinementStrategy]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2018-11-07 16:54:09,928 INFO L327 seRefinementStrategy]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 6, 6] total 80 [2018-11-07 16:54:09,928 INFO L251 anRefinementStrategy]: Using the first two imperfect interpolant sequences [2018-11-07 16:54:09,931 INFO L459 AbstractCegarLoop]: Interpolant automaton has 76 states [2018-11-07 16:54:09,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2018-11-07 16:54:09,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=6078, Unknown=0, NotChecked=0, Total=6320 [2018-11-07 16:54:09,932 INFO L87 Difference]: Start difference. First operand 303 states and 312 transitions. Second operand 76 states. Received shutdown request... [2018-11-07 16:54:25,909 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2018-11-07 16:54:25,909 WARN L549 AbstractCegarLoop]: Verification canceled [2018-11-07 16:54:25,913 WARN L205 ceAbstractionStarter]: Timeout [2018-11-07 16:54:25,913 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:54:25 BoogieIcfgContainer [2018-11-07 16:54:25,913 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2018-11-07 16:54:25,914 INFO L168 Benchmark]: Toolchain (without parser) took 256752.90 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 788.5 MB). Free memory was 1.4 GB in the beginning and 2.1 GB in the end (delta: -674.0 MB). Peak memory consumption was 114.5 MB. Max. memory is 7.1 GB. [2018-11-07 16:54:25,915 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:54:25,915 INFO L168 Benchmark]: CACSL2BoogieTranslator took 290.22 ms. Allocated memory is still 1.5 GB. Free memory was 1.4 GB in the beginning and 1.4 GB in the end (delta: 10.6 MB). Peak memory consumption was 10.6 MB. Max. memory is 7.1 GB. [2018-11-07 16:54:25,916 INFO L168 Benchmark]: Boogie Procedure Inliner took 24.58 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:54:25,916 INFO L168 Benchmark]: Boogie Preprocessor took 30.49 ms. Allocated memory is still 1.5 GB. Free memory is still 1.4 GB. There was no memory consumed. Max. memory is 7.1 GB. [2018-11-07 16:54:25,917 INFO L168 Benchmark]: RCFGBuilder took 523.49 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 739.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.8 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. [2018-11-07 16:54:25,917 INFO L168 Benchmark]: TraceAbstraction took 255876.83 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 49.3 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 110.2 MB). Peak memory consumption was 159.5 MB. Max. memory is 7.1 GB. [2018-11-07 16:54:25,921 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 1.5 GB. Free memory is still 1.5 GB. There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 290.22 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 24.58 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 30.49 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 523.49 ms. Allocated memory was 1.5 GB in the beginning and 2.3 GB in the end (delta: 739.2 MB). Free memory was 1.4 GB in the beginning and 2.2 GB in the end (delta: -794.8 MB). Peak memory consumption was 26.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 255876.83 ms. Allocated memory was 2.3 GB in the beginning and 2.3 GB in the end (delta: 49.3 MB). Free memory was 2.2 GB in the beginning and 2.1 GB in the end (delta: 110.2 MB). Peak memory consumption was 159.5 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - TimeoutResultAtElement [Line: 2]: Timeout (TraceAbstraction) Unable to prove that call of __VERIFIER_error() unreachable (line 2). Cancelled while BasicCegarLoop was constructing difference of abstraction (303states) and FLOYD_HOARE automaton (currently 71 states, 76 states before enhancement),while PredicateComparison was comparing new predicate (quantifier-free) to 149 known predicates. - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 21 locations, 1 error locations. TIMEOUT Result, 255.7s OverallTime, 24 OverallIterations, 70 TraceHistogramMax, 70.9s AutomataDifference, 0.0s DeadEndRemovalTime, 0.0s HoareAnnotationTime, HoareTripleCheckerStatistics: 875 SDtfs, 2126 SDslu, 31290 SDs, 0 SdLazy, 84949 SolverSat, 654 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 48.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 6535 GetRequests, 5171 SyntacticMatches, 34 SemanticMatches, 1329 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4629 ImplicationChecksByTransitivity, 105.0s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=303occurred in iteration=23, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.4s AbstIntTime, 2 AbstIntIterations, 0 AbstIntStrong, NaN AbsIntWeakeningRatio, NaN AbsIntAvgWeakeningVarsNumRemoved, NaN AbsIntAvgWeakenedConjuncts, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 23 MinimizatonAttempts, 57 StatesRemovedByMinimization, 21 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TraceCheckStatistics: 0.1s SsaConstructionTime, 82.7s SatisfiabilityAnalysisTime, 99.5s InterpolantComputationTime, 5649 NumberOfCodeBlocks, 4781 NumberOfCodeBlocksAsserted, 75 NumberOfCheckSat, 8395 ConstructedInterpolants, 955 QuantifiedInterpolants, 11936849 SizeOfPredicates, 47 NumberOfNonLiveVariables, 2846 ConjunctsInSsa, 871 ConjunctsInUnsatCore, 68 InterpolantComputations, 5 PerfectInterpolantSequences, 59261/178638 InterpolantCoveringCapability, InvariantSynthesisStatistics: No data available, InterpolantConsolidationStatistics: No data available, ReuseStatistics: No data available RESULT: Ultimate could not prove your program: Timeout Completed graceful shutdown