java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 19:14:59,477 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 19:14:59,480 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 19:14:59,493 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 19:14:59,493 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 19:14:59,494 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 19:14:59,496 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 19:14:59,498 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 19:14:59,500 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 19:14:59,501 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 19:14:59,502 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 19:14:59,503 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 19:14:59,503 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 19:14:59,504 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 19:14:59,505 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 19:14:59,507 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 19:14:59,507 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 19:14:59,508 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 19:14:59,510 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 19:14:59,512 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 19:14:59,514 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 19:14:59,515 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 19:14:59,516 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 19:14:59,517 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 19:14:59,520 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2019-10-13 19:14:59,520 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2019-10-13 19:14:59,520 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2019-10-13 19:14:59,521 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2019-10-13 19:14:59,522 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2019-10-13 19:14:59,522 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2019-10-13 19:14:59,523 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 19:14:59,525 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 19:14:59,526 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 19:14:59,527 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 19:14:59,531 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 19:14:59,531 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 19:14:59,532 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 19:14:59,532 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 19:14:59,532 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 19:14:59,533 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 19:14:59,534 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 19:14:59,535 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 19:14:59,557 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 19:14:59,557 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 19:14:59,559 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 19:14:59,559 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 19:14:59,559 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 19:14:59,560 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 19:14:59,560 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 19:14:59,560 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 19:14:59,560 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 19:14:59,560 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 19:14:59,561 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 19:14:59,561 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 19:14:59,561 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 19:14:59,561 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 19:14:59,562 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 19:14:59,562 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 19:14:59,562 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 19:14:59,562 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 19:14:59,562 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 19:14:59,563 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 19:14:59,563 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 19:14:59,563 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 19:14:59,563 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 19:14:59,564 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 19:14:59,564 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 19:14:59,564 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 19:14:59,564 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 19:14:59,564 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 19:14:59,565 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 19:14:59,940 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 19:14:59,961 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 19:14:59,965 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 19:14:59,968 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 19:14:59,969 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 19:14:59,970 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-13 19:15:00,048 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/879c32897/b503d58cd5234fd68f3fcb6bbc68f2e7/FLAG5505da612 [2019-10-13 19:15:00,517 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 19:15:00,518 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/array_3-2.i [2019-10-13 19:15:00,525 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/879c32897/b503d58cd5234fd68f3fcb6bbc68f2e7/FLAG5505da612 [2019-10-13 19:15:00,859 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/879c32897/b503d58cd5234fd68f3fcb6bbc68f2e7 [2019-10-13 19:15:00,870 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 19:15:00,871 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 19:15:00,872 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 19:15:00,872 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 19:15:00,876 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 19:15:00,877 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:15:00" (1/1) ... [2019-10-13 19:15:00,880 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4975dbb3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:00, skipping insertion in model container [2019-10-13 19:15:00,881 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 07:15:00" (1/1) ... [2019-10-13 19:15:00,889 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 19:15:00,909 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 19:15:01,146 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 19:15:01,154 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 19:15:01,181 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 19:15:01,206 INFO L192 MainTranslator]: Completed translation [2019-10-13 19:15:01,207 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01 WrapperNode [2019-10-13 19:15:01,208 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 19:15:01,209 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 19:15:01,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 19:15:01,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 19:15:01,307 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,308 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,317 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,319 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,333 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,338 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,345 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (1/1) ... [2019-10-13 19:15:01,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 19:15:01,355 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 19:15:01,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 19:15:01,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 19:15:01,356 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (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 [2019-10-13 19:15:01,417 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 19:15:01,418 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 19:15:01,418 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 19:15:01,418 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 19:15:01,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 19:15:01,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 19:15:01,418 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 19:15:01,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 19:15:01,420 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 19:15:01,640 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 19:15:01,640 INFO L284 CfgBuilder]: Removed 2 assume(true) statements. [2019-10-13 19:15:01,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:15:01 BoogieIcfgContainer [2019-10-13 19:15:01,642 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 19:15:01,643 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 19:15:01,643 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 19:15:01,646 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 19:15:01,647 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 07:15:00" (1/3) ... [2019-10-13 19:15:01,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@199aef97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:15:01, skipping insertion in model container [2019-10-13 19:15:01,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 07:15:01" (2/3) ... [2019-10-13 19:15:01,648 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@199aef97 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 07:15:01, skipping insertion in model container [2019-10-13 19:15:01,648 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 07:15:01" (3/3) ... [2019-10-13 19:15:01,650 INFO L109 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2019-10-13 19:15:01,660 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 19:15:01,666 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 19:15:01,675 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 19:15:01,698 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 19:15:01,698 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 19:15:01,698 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 19:15:01,698 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 19:15:01,698 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 19:15:01,698 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 19:15:01,698 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 19:15:01,699 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 19:15:01,716 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-10-13 19:15:01,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2019-10-13 19:15:01,722 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:01,723 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:01,725 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:01,731 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:01,731 INFO L82 PathProgramCache]: Analyzing trace with hash 1584649929, now seen corresponding path program 1 times [2019-10-13 19:15:01,739 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:01,740 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [734924816] [2019-10-13 19:15:01,740 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:01,740 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:01,740 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:01,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:01,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:01,915 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 19:15:01,916 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [734924816] [2019-10-13 19:15:01,918 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 19:15:01,918 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 19:15:01,919 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354981114] [2019-10-13 19:15:01,927 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 19:15:01,928 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:01,949 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 19:15:01,950 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 19:15:01,953 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2019-10-13 19:15:02,064 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:02,065 INFO L93 Difference]: Finished difference Result 42 states and 51 transitions. [2019-10-13 19:15:02,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 19:15:02,067 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2019-10-13 19:15:02,068 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:02,075 INFO L225 Difference]: With dead ends: 42 [2019-10-13 19:15:02,075 INFO L226 Difference]: Without dead ends: 18 [2019-10-13 19:15:02,078 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 19:15:02,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2019-10-13 19:15:02,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2019-10-13 19:15:02,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2019-10-13 19:15:02,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2019-10-13 19:15:02,114 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 13 [2019-10-13 19:15:02,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:02,114 INFO L462 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2019-10-13 19:15:02,114 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 19:15:02,115 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2019-10-13 19:15:02,115 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-13 19:15:02,116 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:02,116 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:02,116 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:02,117 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:02,117 INFO L82 PathProgramCache]: Analyzing trace with hash -963606854, now seen corresponding path program 1 times [2019-10-13 19:15:02,117 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:02,117 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205652701] [2019-10-13 19:15:02,118 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,118 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,118 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:02,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,204 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 19:15:02,205 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205652701] [2019-10-13 19:15:02,205 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 19:15:02,205 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 19:15:02,206 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743003701] [2019-10-13 19:15:02,210 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 19:15:02,210 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:02,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 19:15:02,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 19:15:02,211 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 4 states. [2019-10-13 19:15:02,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:02,320 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2019-10-13 19:15:02,321 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 19:15:02,321 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-13 19:15:02,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:02,324 INFO L225 Difference]: With dead ends: 35 [2019-10-13 19:15:02,324 INFO L226 Difference]: Without dead ends: 25 [2019-10-13 19:15:02,326 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 19:15:02,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-13 19:15:02,331 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 19. [2019-10-13 19:15:02,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2019-10-13 19:15:02,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2019-10-13 19:15:02,333 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 15 [2019-10-13 19:15:02,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:02,334 INFO L462 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2019-10-13 19:15:02,334 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 19:15:02,334 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2019-10-13 19:15:02,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-13 19:15:02,335 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:02,335 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:02,335 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:02,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:02,336 INFO L82 PathProgramCache]: Analyzing trace with hash -544788776, now seen corresponding path program 1 times [2019-10-13 19:15:02,336 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:02,337 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1742577194] [2019-10-13 19:15:02,337 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,337 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,337 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:02,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,485 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 19:15:02,486 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1742577194] [2019-10-13 19:15:02,486 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 19:15:02,487 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2019-10-13 19:15:02,487 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260822794] [2019-10-13 19:15:02,487 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 19:15:02,488 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:02,488 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 19:15:02,489 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2019-10-13 19:15:02,489 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 6 states. [2019-10-13 19:15:02,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:02,592 INFO L93 Difference]: Finished difference Result 29 states and 32 transitions. [2019-10-13 19:15:02,592 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 19:15:02,593 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-13 19:15:02,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:02,594 INFO L225 Difference]: With dead ends: 29 [2019-10-13 19:15:02,594 INFO L226 Difference]: Without dead ends: 24 [2019-10-13 19:15:02,595 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2019-10-13 19:15:02,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-13 19:15:02,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 22. [2019-10-13 19:15:02,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-13 19:15:02,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-10-13 19:15:02,600 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-10-13 19:15:02,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:02,601 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-10-13 19:15:02,601 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 19:15:02,601 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-10-13 19:15:02,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-13 19:15:02,602 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:02,602 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:02,602 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:02,603 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:02,603 INFO L82 PathProgramCache]: Analyzing trace with hash 1315898579, now seen corresponding path program 1 times [2019-10-13 19:15:02,603 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:02,603 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666471301] [2019-10-13 19:15:02,604 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,604 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:02,604 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:02,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,721 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 19:15:02,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666471301] [2019-10-13 19:15:02,722 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1903344253] [2019-10-13 19:15:02,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:02,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:02,776 INFO L256 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 19:15:02,783 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:02,833 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-10-13 19:15:02,833 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:02,834 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 8 [2019-10-13 19:15:02,834 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149629462] [2019-10-13 19:15:02,834 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-13 19:15:02,835 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:02,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-13 19:15:02,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2019-10-13 19:15:02,836 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 8 states. [2019-10-13 19:15:02,964 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:02,964 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-13 19:15:02,964 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-13 19:15:02,964 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-10-13 19:15:02,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:02,965 INFO L225 Difference]: With dead ends: 46 [2019-10-13 19:15:02,965 INFO L226 Difference]: Without dead ends: 30 [2019-10-13 19:15:02,966 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=26, Invalid=64, Unknown=0, NotChecked=0, Total=90 [2019-10-13 19:15:02,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-13 19:15:02,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-13 19:15:02,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-13 19:15:02,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2019-10-13 19:15:02,973 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 21 [2019-10-13 19:15:02,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:02,973 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2019-10-13 19:15:02,973 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-13 19:15:02,973 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2019-10-13 19:15:02,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 19:15:02,974 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:02,975 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:03,179 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:03,180 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:03,180 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:03,181 INFO L82 PathProgramCache]: Analyzing trace with hash 516358124, now seen corresponding path program 2 times [2019-10-13 19:15:03,181 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:03,182 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1600985756] [2019-10-13 19:15:03,182 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:03,182 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:03,183 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:03,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:03,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:03,296 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-13 19:15:03,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1600985756] [2019-10-13 19:15:03,297 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972356477] [2019-10-13 19:15:03,297 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:03,345 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 19:15:03,345 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:03,346 INFO L256 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 19:15:03,348 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:03,372 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-10-13 19:15:03,375 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:03,375 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 5] total 9 [2019-10-13 19:15:03,375 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1755323654] [2019-10-13 19:15:03,376 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 19:15:03,376 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:03,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 19:15:03,377 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-13 19:15:03,377 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 9 states. [2019-10-13 19:15:03,549 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:03,550 INFO L93 Difference]: Finished difference Result 56 states and 66 transitions. [2019-10-13 19:15:03,551 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 19:15:03,551 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-13 19:15:03,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:03,552 INFO L225 Difference]: With dead ends: 56 [2019-10-13 19:15:03,552 INFO L226 Difference]: Without dead ends: 36 [2019-10-13 19:15:03,553 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-13 19:15:03,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-10-13 19:15:03,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2019-10-13 19:15:03,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-13 19:15:03,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 39 transitions. [2019-10-13 19:15:03,564 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 39 transitions. Word has length 27 [2019-10-13 19:15:03,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:03,564 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 39 transitions. [2019-10-13 19:15:03,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 19:15:03,565 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 39 transitions. [2019-10-13 19:15:03,568 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-10-13 19:15:03,569 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:03,569 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:03,769 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:03,770 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:03,770 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:03,770 INFO L82 PathProgramCache]: Analyzing trace with hash -1291397115, now seen corresponding path program 3 times [2019-10-13 19:15:03,770 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:03,771 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1118453041] [2019-10-13 19:15:03,771 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:03,772 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:03,772 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:03,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:03,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:03,911 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 19:15:03,912 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1118453041] [2019-10-13 19:15:03,912 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [253671797] [2019-10-13 19:15:03,912 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:03,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-13 19:15:03,958 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:03,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 97 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 19:15:03,962 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:03,983 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-10-13 19:15:03,984 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:03,984 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 6] total 10 [2019-10-13 19:15:03,985 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72529292] [2019-10-13 19:15:03,986 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-13 19:15:03,987 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:03,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-13 19:15:03,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2019-10-13 19:15:03,989 INFO L87 Difference]: Start difference. First operand 34 states and 39 transitions. Second operand 10 states. [2019-10-13 19:15:04,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:04,127 INFO L93 Difference]: Finished difference Result 66 states and 78 transitions. [2019-10-13 19:15:04,128 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 19:15:04,128 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 33 [2019-10-13 19:15:04,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:04,129 INFO L225 Difference]: With dead ends: 66 [2019-10-13 19:15:04,129 INFO L226 Difference]: Without dead ends: 42 [2019-10-13 19:15:04,131 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2019-10-13 19:15:04,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-10-13 19:15:04,141 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2019-10-13 19:15:04,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-13 19:15:04,142 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2019-10-13 19:15:04,142 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 33 [2019-10-13 19:15:04,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:04,142 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2019-10-13 19:15:04,143 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-13 19:15:04,143 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2019-10-13 19:15:04,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-13 19:15:04,147 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:04,147 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:04,347 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:04,348 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:04,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:04,349 INFO L82 PathProgramCache]: Analyzing trace with hash 893709598, now seen corresponding path program 4 times [2019-10-13 19:15:04,350 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:04,350 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047546606] [2019-10-13 19:15:04,350 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:04,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:04,351 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:04,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:04,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:04,535 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-13 19:15:04,536 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047546606] [2019-10-13 19:15:04,537 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827902560] [2019-10-13 19:15:04,538 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:04,609 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 19:15:04,609 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:04,610 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 19:15:04,619 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:04,650 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 19:15:04,651 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:04,651 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 7] total 11 [2019-10-13 19:15:04,651 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [587721696] [2019-10-13 19:15:04,652 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-13 19:15:04,652 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:04,652 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-13 19:15:04,653 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2019-10-13 19:15:04,653 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand 11 states. [2019-10-13 19:15:04,791 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:04,792 INFO L93 Difference]: Finished difference Result 76 states and 90 transitions. [2019-10-13 19:15:04,792 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-13 19:15:04,792 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2019-10-13 19:15:04,793 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:04,793 INFO L225 Difference]: With dead ends: 76 [2019-10-13 19:15:04,793 INFO L226 Difference]: Without dead ends: 48 [2019-10-13 19:15:04,794 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2019-10-13 19:15:04,794 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-13 19:15:04,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2019-10-13 19:15:04,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-13 19:15:04,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 53 transitions. [2019-10-13 19:15:04,801 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 53 transitions. Word has length 39 [2019-10-13 19:15:04,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:04,801 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 53 transitions. [2019-10-13 19:15:04,801 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-13 19:15:04,801 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 53 transitions. [2019-10-13 19:15:04,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-10-13 19:15:04,802 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:04,802 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:05,005 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:05,006 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:05,006 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:05,007 INFO L82 PathProgramCache]: Analyzing trace with hash -398483657, now seen corresponding path program 5 times [2019-10-13 19:15:05,007 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:05,007 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454116509] [2019-10-13 19:15:05,007 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:05,008 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:05,008 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:05,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:05,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:05,211 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 19:15:05,211 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454116509] [2019-10-13 19:15:05,211 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492062271] [2019-10-13 19:15:05,211 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:05,285 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-13 19:15:05,285 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:05,286 INFO L256 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 19:15:05,289 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:05,303 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-10-13 19:15:05,303 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:05,303 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 12 [2019-10-13 19:15:05,303 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1821774464] [2019-10-13 19:15:05,304 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 19:15:05,304 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:05,305 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 19:15:05,305 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2019-10-13 19:15:05,305 INFO L87 Difference]: Start difference. First operand 46 states and 53 transitions. Second operand 12 states. [2019-10-13 19:15:05,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:05,431 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2019-10-13 19:15:05,433 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 19:15:05,434 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 45 [2019-10-13 19:15:05,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:05,435 INFO L225 Difference]: With dead ends: 86 [2019-10-13 19:15:05,435 INFO L226 Difference]: Without dead ends: 54 [2019-10-13 19:15:05,435 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-13 19:15:05,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-13 19:15:05,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-13 19:15:05,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-13 19:15:05,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 60 transitions. [2019-10-13 19:15:05,442 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 60 transitions. Word has length 45 [2019-10-13 19:15:05,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:05,442 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 60 transitions. [2019-10-13 19:15:05,442 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 19:15:05,443 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 60 transitions. [2019-10-13 19:15:05,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-13 19:15:05,443 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:05,444 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:05,647 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:05,647 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:05,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:05,648 INFO L82 PathProgramCache]: Analyzing trace with hash 291327568, now seen corresponding path program 6 times [2019-10-13 19:15:05,648 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:05,648 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1036586466] [2019-10-13 19:15:05,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:05,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:05,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:05,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:05,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:05,776 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 19:15:05,777 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1036586466] [2019-10-13 19:15:05,777 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1140831881] [2019-10-13 19:15:05,777 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:05,847 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 19:15:05,848 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:05,849 INFO L256 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 19:15:05,851 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:05,868 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-10-13 19:15:05,868 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:05,869 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 9] total 13 [2019-10-13 19:15:05,869 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1533080085] [2019-10-13 19:15:05,869 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 19:15:05,870 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:05,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 19:15:05,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2019-10-13 19:15:05,871 INFO L87 Difference]: Start difference. First operand 52 states and 60 transitions. Second operand 13 states. [2019-10-13 19:15:06,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:06,028 INFO L93 Difference]: Finished difference Result 96 states and 114 transitions. [2019-10-13 19:15:06,029 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 19:15:06,029 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-10-13 19:15:06,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:06,030 INFO L225 Difference]: With dead ends: 96 [2019-10-13 19:15:06,030 INFO L226 Difference]: Without dead ends: 60 [2019-10-13 19:15:06,031 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=149, Unknown=0, NotChecked=0, Total=210 [2019-10-13 19:15:06,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-10-13 19:15:06,036 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 58. [2019-10-13 19:15:06,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-13 19:15:06,037 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 67 transitions. [2019-10-13 19:15:06,037 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 67 transitions. Word has length 51 [2019-10-13 19:15:06,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:06,038 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 67 transitions. [2019-10-13 19:15:06,038 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 19:15:06,038 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 67 transitions. [2019-10-13 19:15:06,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-13 19:15:06,039 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:06,039 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:06,249 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:06,250 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:06,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:06,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1655462505, now seen corresponding path program 7 times [2019-10-13 19:15:06,251 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:06,251 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [783153824] [2019-10-13 19:15:06,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:06,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:06,252 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:06,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:06,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:06,417 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-13 19:15:06,417 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [783153824] [2019-10-13 19:15:06,418 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632592325] [2019-10-13 19:15:06,418 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:06,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:06,477 INFO L256 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 19:15:06,480 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:06,500 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-10-13 19:15:06,501 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:06,501 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10] total 14 [2019-10-13 19:15:06,501 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118087724] [2019-10-13 19:15:06,502 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 19:15:06,502 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:06,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 19:15:06,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2019-10-13 19:15:06,503 INFO L87 Difference]: Start difference. First operand 58 states and 67 transitions. Second operand 14 states. [2019-10-13 19:15:06,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:06,678 INFO L93 Difference]: Finished difference Result 106 states and 126 transitions. [2019-10-13 19:15:06,678 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-13 19:15:06,678 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 57 [2019-10-13 19:15:06,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:06,680 INFO L225 Difference]: With dead ends: 106 [2019-10-13 19:15:06,680 INFO L226 Difference]: Without dead ends: 66 [2019-10-13 19:15:06,681 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=71, Invalid=169, Unknown=0, NotChecked=0, Total=240 [2019-10-13 19:15:06,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-13 19:15:06,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 64. [2019-10-13 19:15:06,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-13 19:15:06,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 74 transitions. [2019-10-13 19:15:06,689 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 74 transitions. Word has length 57 [2019-10-13 19:15:06,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:06,690 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 74 transitions. [2019-10-13 19:15:06,690 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 19:15:06,690 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 74 transitions. [2019-10-13 19:15:06,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-13 19:15:06,691 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:06,691 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:06,895 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:06,895 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:06,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:06,896 INFO L82 PathProgramCache]: Analyzing trace with hash -454876286, now seen corresponding path program 8 times [2019-10-13 19:15:06,896 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:06,897 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [262138983] [2019-10-13 19:15:06,897 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:06,897 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:06,898 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:06,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:07,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:07,037 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2019-10-13 19:15:07,037 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [262138983] [2019-10-13 19:15:07,038 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2090921142] [2019-10-13 19:15:07,038 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:07,100 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 19:15:07,100 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:07,101 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 19:15:07,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:07,139 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-10-13 19:15:07,139 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:07,140 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 11] total 15 [2019-10-13 19:15:07,140 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813389225] [2019-10-13 19:15:07,140 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 19:15:07,141 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:07,141 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 19:15:07,141 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2019-10-13 19:15:07,141 INFO L87 Difference]: Start difference. First operand 64 states and 74 transitions. Second operand 15 states. [2019-10-13 19:15:07,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:07,313 INFO L93 Difference]: Finished difference Result 116 states and 138 transitions. [2019-10-13 19:15:07,314 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 19:15:07,314 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 63 [2019-10-13 19:15:07,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:07,315 INFO L225 Difference]: With dead ends: 116 [2019-10-13 19:15:07,315 INFO L226 Difference]: Without dead ends: 72 [2019-10-13 19:15:07,316 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=190, Unknown=0, NotChecked=0, Total=272 [2019-10-13 19:15:07,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2019-10-13 19:15:07,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 70. [2019-10-13 19:15:07,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-10-13 19:15:07,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 81 transitions. [2019-10-13 19:15:07,322 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 81 transitions. Word has length 63 [2019-10-13 19:15:07,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:07,322 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 81 transitions. [2019-10-13 19:15:07,322 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 19:15:07,323 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 81 transitions. [2019-10-13 19:15:07,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-13 19:15:07,324 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:07,324 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:07,527 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:07,528 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:07,528 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:07,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1633683867, now seen corresponding path program 9 times [2019-10-13 19:15:07,529 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:07,530 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [429354393] [2019-10-13 19:15:07,530 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:07,530 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:07,531 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:07,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:07,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:07,681 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 19:15:07,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [429354393] [2019-10-13 19:15:07,681 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1442425176] [2019-10-13 19:15:07,681 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:07,804 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2019-10-13 19:15:07,805 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:07,806 INFO L256 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 19:15:07,808 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:07,845 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-10-13 19:15:07,846 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:07,846 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 12] total 16 [2019-10-13 19:15:07,846 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [61371290] [2019-10-13 19:15:07,847 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-13 19:15:07,847 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:07,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-13 19:15:07,848 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2019-10-13 19:15:07,848 INFO L87 Difference]: Start difference. First operand 70 states and 81 transitions. Second operand 16 states. [2019-10-13 19:15:08,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:08,012 INFO L93 Difference]: Finished difference Result 126 states and 150 transitions. [2019-10-13 19:15:08,012 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-13 19:15:08,012 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 69 [2019-10-13 19:15:08,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:08,013 INFO L225 Difference]: With dead ends: 126 [2019-10-13 19:15:08,014 INFO L226 Difference]: Without dead ends: 78 [2019-10-13 19:15:08,015 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=94, Invalid=212, Unknown=0, NotChecked=0, Total=306 [2019-10-13 19:15:08,015 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-13 19:15:08,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 76. [2019-10-13 19:15:08,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-13 19:15:08,021 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 88 transitions. [2019-10-13 19:15:08,022 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 88 transitions. Word has length 69 [2019-10-13 19:15:08,022 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:08,022 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 88 transitions. [2019-10-13 19:15:08,022 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-13 19:15:08,022 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 88 transitions. [2019-10-13 19:15:08,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-13 19:15:08,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:08,024 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:08,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:08,229 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:08,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:08,229 INFO L82 PathProgramCache]: Analyzing trace with hash 1277783220, now seen corresponding path program 10 times [2019-10-13 19:15:08,229 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:08,229 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1190580356] [2019-10-13 19:15:08,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:08,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:08,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:08,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:08,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:08,463 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2019-10-13 19:15:08,464 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1190580356] [2019-10-13 19:15:08,464 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880725816] [2019-10-13 19:15:08,464 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:08,540 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 19:15:08,540 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:08,542 INFO L256 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 19:15:08,551 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:08,577 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-10-13 19:15:08,578 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:08,578 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13] total 17 [2019-10-13 19:15:08,578 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [447482947] [2019-10-13 19:15:08,579 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-13 19:15:08,579 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:08,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-13 19:15:08,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2019-10-13 19:15:08,580 INFO L87 Difference]: Start difference. First operand 76 states and 88 transitions. Second operand 17 states. [2019-10-13 19:15:08,785 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:08,785 INFO L93 Difference]: Finished difference Result 136 states and 162 transitions. [2019-10-13 19:15:08,785 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-13 19:15:08,785 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 75 [2019-10-13 19:15:08,786 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:08,786 INFO L225 Difference]: With dead ends: 136 [2019-10-13 19:15:08,786 INFO L226 Difference]: Without dead ends: 84 [2019-10-13 19:15:08,789 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=235, Unknown=0, NotChecked=0, Total=342 [2019-10-13 19:15:08,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-13 19:15:08,797 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-13 19:15:08,797 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-13 19:15:08,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 95 transitions. [2019-10-13 19:15:08,799 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 95 transitions. Word has length 75 [2019-10-13 19:15:08,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:08,801 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 95 transitions. [2019-10-13 19:15:08,801 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-13 19:15:08,801 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 95 transitions. [2019-10-13 19:15:08,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-13 19:15:08,804 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:08,804 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:09,007 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:09,008 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:09,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:09,009 INFO L82 PathProgramCache]: Analyzing trace with hash 770550989, now seen corresponding path program 11 times [2019-10-13 19:15:09,009 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:09,010 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [13819952] [2019-10-13 19:15:09,010 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:09,010 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:09,010 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:09,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:09,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:09,245 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-13 19:15:09,245 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [13819952] [2019-10-13 19:15:09,246 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186370660] [2019-10-13 19:15:09,246 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:09,465 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-13 19:15:09,466 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:09,468 INFO L256 TraceCheckSpWp]: Trace formula consists of 209 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 19:15:09,470 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:09,509 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-10-13 19:15:09,510 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:09,510 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 14] total 18 [2019-10-13 19:15:09,511 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1021339143] [2019-10-13 19:15:09,512 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 19:15:09,512 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:09,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 19:15:09,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2019-10-13 19:15:09,513 INFO L87 Difference]: Start difference. First operand 82 states and 95 transitions. Second operand 18 states. [2019-10-13 19:15:09,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:09,732 INFO L93 Difference]: Finished difference Result 146 states and 174 transitions. [2019-10-13 19:15:09,732 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 19:15:09,732 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 81 [2019-10-13 19:15:09,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:09,734 INFO L225 Difference]: With dead ends: 146 [2019-10-13 19:15:09,734 INFO L226 Difference]: Without dead ends: 90 [2019-10-13 19:15:09,735 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=121, Invalid=259, Unknown=0, NotChecked=0, Total=380 [2019-10-13 19:15:09,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2019-10-13 19:15:09,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 88. [2019-10-13 19:15:09,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-13 19:15:09,741 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 102 transitions. [2019-10-13 19:15:09,742 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 102 transitions. Word has length 81 [2019-10-13 19:15:09,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:09,742 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 102 transitions. [2019-10-13 19:15:09,742 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 19:15:09,742 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 102 transitions. [2019-10-13 19:15:09,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-13 19:15:09,743 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:09,743 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:09,947 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:09,948 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:09,948 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:09,948 INFO L82 PathProgramCache]: Analyzing trace with hash -1912395290, now seen corresponding path program 12 times [2019-10-13 19:15:09,949 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:09,949 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [903015286] [2019-10-13 19:15:09,950 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:09,950 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:09,950 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:09,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:10,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:10,152 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 19:15:10,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [903015286] [2019-10-13 19:15:10,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [660615968] [2019-10-13 19:15:10,153 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:10,307 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 19:15:10,307 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:10,309 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 19:15:10,311 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:10,356 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 300 trivial. 0 not checked. [2019-10-13 19:15:10,357 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:10,357 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 15] total 19 [2019-10-13 19:15:10,357 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1258605261] [2019-10-13 19:15:10,358 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 19:15:10,358 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:10,358 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 19:15:10,359 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2019-10-13 19:15:10,359 INFO L87 Difference]: Start difference. First operand 88 states and 102 transitions. Second operand 19 states. [2019-10-13 19:15:10,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:10,594 INFO L93 Difference]: Finished difference Result 156 states and 186 transitions. [2019-10-13 19:15:10,595 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 19:15:10,595 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 87 [2019-10-13 19:15:10,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:10,596 INFO L225 Difference]: With dead ends: 156 [2019-10-13 19:15:10,596 INFO L226 Difference]: Without dead ends: 96 [2019-10-13 19:15:10,597 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 107 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=136, Invalid=284, Unknown=0, NotChecked=0, Total=420 [2019-10-13 19:15:10,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-13 19:15:10,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 94. [2019-10-13 19:15:10,609 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 94 states. [2019-10-13 19:15:10,610 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 109 transitions. [2019-10-13 19:15:10,610 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 109 transitions. Word has length 87 [2019-10-13 19:15:10,610 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:10,611 INFO L462 AbstractCegarLoop]: Abstraction has 94 states and 109 transitions. [2019-10-13 19:15:10,611 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 19:15:10,611 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 109 transitions. [2019-10-13 19:15:10,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2019-10-13 19:15:10,617 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:10,617 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:10,817 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:10,818 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:10,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:10,818 INFO L82 PathProgramCache]: Analyzing trace with hash 1550337023, now seen corresponding path program 13 times [2019-10-13 19:15:10,818 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:10,818 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1976931217] [2019-10-13 19:15:10,819 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:10,819 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:10,819 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:10,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:11,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:11,045 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2019-10-13 19:15:11,046 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1976931217] [2019-10-13 19:15:11,046 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [734272383] [2019-10-13 19:15:11,046 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:11,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:11,113 INFO L256 TraceCheckSpWp]: Trace formula consists of 237 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 19:15:11,115 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:11,136 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2019-10-13 19:15:11,137 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:11,137 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 16] total 20 [2019-10-13 19:15:11,137 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287863502] [2019-10-13 19:15:11,138 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-13 19:15:11,138 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:11,138 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-13 19:15:11,138 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2019-10-13 19:15:11,139 INFO L87 Difference]: Start difference. First operand 94 states and 109 transitions. Second operand 20 states. [2019-10-13 19:15:11,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:11,335 INFO L93 Difference]: Finished difference Result 166 states and 198 transitions. [2019-10-13 19:15:11,335 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-13 19:15:11,335 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 93 [2019-10-13 19:15:11,335 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:11,336 INFO L225 Difference]: With dead ends: 166 [2019-10-13 19:15:11,336 INFO L226 Difference]: Without dead ends: 102 [2019-10-13 19:15:11,337 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 94 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=152, Invalid=310, Unknown=0, NotChecked=0, Total=462 [2019-10-13 19:15:11,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2019-10-13 19:15:11,341 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 100. [2019-10-13 19:15:11,342 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-13 19:15:11,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 116 transitions. [2019-10-13 19:15:11,342 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 116 transitions. Word has length 93 [2019-10-13 19:15:11,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:11,343 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 116 transitions. [2019-10-13 19:15:11,343 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-13 19:15:11,343 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 116 transitions. [2019-10-13 19:15:11,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2019-10-13 19:15:11,344 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:11,344 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:11,548 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:11,549 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:11,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:11,549 INFO L82 PathProgramCache]: Analyzing trace with hash -607954152, now seen corresponding path program 14 times [2019-10-13 19:15:11,550 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:11,550 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [36049085] [2019-10-13 19:15:11,550 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:11,550 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:11,551 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:11,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:11,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:11,823 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 196 trivial. 0 not checked. [2019-10-13 19:15:11,823 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [36049085] [2019-10-13 19:15:11,823 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2132047776] [2019-10-13 19:15:11,824 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:11,927 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 19:15:11,927 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:11,929 INFO L256 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 19:15:11,932 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:11,964 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 406 trivial. 0 not checked. [2019-10-13 19:15:11,965 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:11,965 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 17] total 21 [2019-10-13 19:15:11,965 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747316191] [2019-10-13 19:15:11,966 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 19:15:11,966 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:11,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 19:15:11,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2019-10-13 19:15:11,967 INFO L87 Difference]: Start difference. First operand 100 states and 116 transitions. Second operand 21 states. [2019-10-13 19:15:12,213 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:12,213 INFO L93 Difference]: Finished difference Result 176 states and 210 transitions. [2019-10-13 19:15:12,213 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-13 19:15:12,214 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 99 [2019-10-13 19:15:12,214 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:12,215 INFO L225 Difference]: With dead ends: 176 [2019-10-13 19:15:12,215 INFO L226 Difference]: Without dead ends: 108 [2019-10-13 19:15:12,216 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=169, Invalid=337, Unknown=0, NotChecked=0, Total=506 [2019-10-13 19:15:12,216 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-10-13 19:15:12,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 106. [2019-10-13 19:15:12,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 106 states. [2019-10-13 19:15:12,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 123 transitions. [2019-10-13 19:15:12,221 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 123 transitions. Word has length 99 [2019-10-13 19:15:12,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:12,222 INFO L462 AbstractCegarLoop]: Abstraction has 106 states and 123 transitions. [2019-10-13 19:15:12,222 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 19:15:12,222 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 123 transitions. [2019-10-13 19:15:12,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 106 [2019-10-13 19:15:12,223 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:12,224 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:12,424 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:12,424 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:12,425 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:12,425 INFO L82 PathProgramCache]: Analyzing trace with hash 191024945, now seen corresponding path program 15 times [2019-10-13 19:15:12,425 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:12,425 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804924998] [2019-10-13 19:15:12,425 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:12,425 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:12,425 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:12,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:12,674 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:12,685 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 465 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-13 19:15:12,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804924998] [2019-10-13 19:15:12,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [305314015] [2019-10-13 19:15:12,685 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:12,958 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-13 19:15:12,959 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:12,961 INFO L256 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-13 19:15:12,962 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:12,992 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 465 trivial. 0 not checked. [2019-10-13 19:15:12,992 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:12,992 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 18] total 22 [2019-10-13 19:15:12,992 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2124362794] [2019-10-13 19:15:12,993 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-13 19:15:12,993 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:12,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-13 19:15:12,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2019-10-13 19:15:12,994 INFO L87 Difference]: Start difference. First operand 106 states and 123 transitions. Second operand 22 states. [2019-10-13 19:15:13,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:13,252 INFO L93 Difference]: Finished difference Result 186 states and 222 transitions. [2019-10-13 19:15:13,252 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 19:15:13,252 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 105 [2019-10-13 19:15:13,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:13,253 INFO L225 Difference]: With dead ends: 186 [2019-10-13 19:15:13,253 INFO L226 Difference]: Without dead ends: 114 [2019-10-13 19:15:13,254 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 128 GetRequests, 106 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=187, Invalid=365, Unknown=0, NotChecked=0, Total=552 [2019-10-13 19:15:13,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2019-10-13 19:15:13,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 112. [2019-10-13 19:15:13,259 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 112 states. [2019-10-13 19:15:13,260 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 130 transitions. [2019-10-13 19:15:13,260 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 130 transitions. Word has length 105 [2019-10-13 19:15:13,260 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:13,260 INFO L462 AbstractCegarLoop]: Abstraction has 112 states and 130 transitions. [2019-10-13 19:15:13,261 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-13 19:15:13,261 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 130 transitions. [2019-10-13 19:15:13,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 112 [2019-10-13 19:15:13,262 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:13,262 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:13,463 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:13,463 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:13,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:13,464 INFO L82 PathProgramCache]: Analyzing trace with hash -1858273206, now seen corresponding path program 16 times [2019-10-13 19:15:13,464 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:13,464 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513615385] [2019-10-13 19:15:13,465 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:13,465 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:13,465 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:13,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:13,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:13,725 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-13 19:15:13,726 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513615385] [2019-10-13 19:15:13,726 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [851196302] [2019-10-13 19:15:13,726 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:13,795 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 19:15:13,795 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:13,797 INFO L256 TraceCheckSpWp]: Trace formula consists of 279 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-13 19:15:13,798 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:13,821 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2019-10-13 19:15:13,821 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:13,821 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 19] total 23 [2019-10-13 19:15:13,821 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1029786866] [2019-10-13 19:15:13,822 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 19:15:13,822 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:13,822 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 19:15:13,823 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2019-10-13 19:15:13,823 INFO L87 Difference]: Start difference. First operand 112 states and 130 transitions. Second operand 23 states. [2019-10-13 19:15:14,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:14,114 INFO L93 Difference]: Finished difference Result 196 states and 234 transitions. [2019-10-13 19:15:14,114 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-13 19:15:14,114 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 111 [2019-10-13 19:15:14,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:14,116 INFO L225 Difference]: With dead ends: 196 [2019-10-13 19:15:14,116 INFO L226 Difference]: Without dead ends: 120 [2019-10-13 19:15:14,117 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=206, Invalid=394, Unknown=0, NotChecked=0, Total=600 [2019-10-13 19:15:14,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2019-10-13 19:15:14,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 118. [2019-10-13 19:15:14,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 118 states. [2019-10-13 19:15:14,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 137 transitions. [2019-10-13 19:15:14,122 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 137 transitions. Word has length 111 [2019-10-13 19:15:14,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:14,122 INFO L462 AbstractCegarLoop]: Abstraction has 118 states and 137 transitions. [2019-10-13 19:15:14,122 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 19:15:14,123 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 137 transitions. [2019-10-13 19:15:14,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2019-10-13 19:15:14,124 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:14,124 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:14,327 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:14,328 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:14,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:14,328 INFO L82 PathProgramCache]: Analyzing trace with hash 602951267, now seen corresponding path program 17 times [2019-10-13 19:15:14,329 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:14,329 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [449774360] [2019-10-13 19:15:14,329 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:14,329 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:14,330 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:14,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:14,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:14,619 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-13 19:15:14,620 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [449774360] [2019-10-13 19:15:14,620 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43244147] [2019-10-13 19:15:14,620 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:14,962 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 18 check-sat command(s) [2019-10-13 19:15:14,962 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:14,966 INFO L256 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-13 19:15:14,968 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:15,021 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 595 trivial. 0 not checked. [2019-10-13 19:15:15,022 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:15,022 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 20] total 24 [2019-10-13 19:15:15,022 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314981198] [2019-10-13 19:15:15,023 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-13 19:15:15,024 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:15,024 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-13 19:15:15,024 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2019-10-13 19:15:15,025 INFO L87 Difference]: Start difference. First operand 118 states and 137 transitions. Second operand 24 states. [2019-10-13 19:15:15,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:15,232 INFO L93 Difference]: Finished difference Result 206 states and 246 transitions. [2019-10-13 19:15:15,233 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 19:15:15,233 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 117 [2019-10-13 19:15:15,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:15,234 INFO L225 Difference]: With dead ends: 206 [2019-10-13 19:15:15,234 INFO L226 Difference]: Without dead ends: 126 [2019-10-13 19:15:15,235 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 118 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2019-10-13 19:15:15,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-13 19:15:15,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 124. [2019-10-13 19:15:15,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 124 states. [2019-10-13 19:15:15,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 144 transitions. [2019-10-13 19:15:15,241 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 144 transitions. Word has length 117 [2019-10-13 19:15:15,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:15,241 INFO L462 AbstractCegarLoop]: Abstraction has 124 states and 144 transitions. [2019-10-13 19:15:15,242 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-13 19:15:15,242 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 144 transitions. [2019-10-13 19:15:15,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2019-10-13 19:15:15,242 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:15,243 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:15,447 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:15,447 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:15,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:15,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1958943100, now seen corresponding path program 18 times [2019-10-13 19:15:15,448 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:15,448 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481796978] [2019-10-13 19:15:15,448 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:15,448 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:15,448 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:15,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:15,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:15,769 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 324 trivial. 0 not checked. [2019-10-13 19:15:15,770 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481796978] [2019-10-13 19:15:15,770 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1714670964] [2019-10-13 19:15:15,770 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:16,392 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-13 19:15:16,392 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:16,395 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-13 19:15:16,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:16,421 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 666 trivial. 0 not checked. [2019-10-13 19:15:16,421 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:16,421 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 21] total 25 [2019-10-13 19:15:16,421 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775102382] [2019-10-13 19:15:16,422 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-13 19:15:16,422 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:16,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-13 19:15:16,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2019-10-13 19:15:16,423 INFO L87 Difference]: Start difference. First operand 124 states and 144 transitions. Second operand 25 states. [2019-10-13 19:15:16,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:16,722 INFO L93 Difference]: Finished difference Result 216 states and 258 transitions. [2019-10-13 19:15:16,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-13 19:15:16,723 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 123 [2019-10-13 19:15:16,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:16,724 INFO L225 Difference]: With dead ends: 216 [2019-10-13 19:15:16,724 INFO L226 Difference]: Without dead ends: 132 [2019-10-13 19:15:16,725 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 149 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=247, Invalid=455, Unknown=0, NotChecked=0, Total=702 [2019-10-13 19:15:16,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2019-10-13 19:15:16,729 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 130. [2019-10-13 19:15:16,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 130 states. [2019-10-13 19:15:16,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 151 transitions. [2019-10-13 19:15:16,730 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 151 transitions. Word has length 123 [2019-10-13 19:15:16,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:16,731 INFO L462 AbstractCegarLoop]: Abstraction has 130 states and 151 transitions. [2019-10-13 19:15:16,731 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-13 19:15:16,731 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 151 transitions. [2019-10-13 19:15:16,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2019-10-13 19:15:16,732 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:16,732 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:16,943 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:16,943 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:16,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:16,944 INFO L82 PathProgramCache]: Analyzing trace with hash -1717321323, now seen corresponding path program 19 times [2019-10-13 19:15:16,944 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:16,945 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [181154604] [2019-10-13 19:15:16,945 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:16,945 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:16,946 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:16,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:17,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:17,258 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 741 refuted. 0 times theorem prover too weak. 361 trivial. 0 not checked. [2019-10-13 19:15:17,258 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [181154604] [2019-10-13 19:15:17,258 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943461603] [2019-10-13 19:15:17,258 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:17,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:17,344 INFO L256 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 19:15:17,346 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:17,406 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 741 trivial. 0 not checked. [2019-10-13 19:15:17,406 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:17,407 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 22] total 26 [2019-10-13 19:15:17,407 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1316781262] [2019-10-13 19:15:17,407 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-13 19:15:17,408 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:17,408 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-13 19:15:17,408 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2019-10-13 19:15:17,408 INFO L87 Difference]: Start difference. First operand 130 states and 151 transitions. Second operand 26 states. [2019-10-13 19:15:17,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:17,707 INFO L93 Difference]: Finished difference Result 226 states and 270 transitions. [2019-10-13 19:15:17,710 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-13 19:15:17,710 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 129 [2019-10-13 19:15:17,710 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:17,711 INFO L225 Difference]: With dead ends: 226 [2019-10-13 19:15:17,712 INFO L226 Difference]: Without dead ends: 138 [2019-10-13 19:15:17,712 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 156 GetRequests, 130 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=269, Invalid=487, Unknown=0, NotChecked=0, Total=756 [2019-10-13 19:15:17,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-13 19:15:17,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 136. [2019-10-13 19:15:17,716 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2019-10-13 19:15:17,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 158 transitions. [2019-10-13 19:15:17,717 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 158 transitions. Word has length 129 [2019-10-13 19:15:17,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:17,717 INFO L462 AbstractCegarLoop]: Abstraction has 136 states and 158 transitions. [2019-10-13 19:15:17,717 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-13 19:15:17,718 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 158 transitions. [2019-10-13 19:15:17,718 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2019-10-13 19:15:17,718 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:17,719 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:17,927 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:17,927 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:17,928 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:17,928 INFO L82 PathProgramCache]: Analyzing trace with hash -148330834, now seen corresponding path program 20 times [2019-10-13 19:15:17,928 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:17,928 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1070447992] [2019-10-13 19:15:17,929 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:17,929 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:17,929 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:17,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:18,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:18,247 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 400 trivial. 0 not checked. [2019-10-13 19:15:18,249 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1070447992] [2019-10-13 19:15:18,249 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [181253830] [2019-10-13 19:15:18,249 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:18,346 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 19:15:18,346 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:18,348 INFO L256 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-13 19:15:18,351 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:18,383 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 820 trivial. 0 not checked. [2019-10-13 19:15:18,384 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:18,384 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 23] total 27 [2019-10-13 19:15:18,384 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087620960] [2019-10-13 19:15:18,386 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 19:15:18,386 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:18,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 19:15:18,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2019-10-13 19:15:18,387 INFO L87 Difference]: Start difference. First operand 136 states and 158 transitions. Second operand 27 states. [2019-10-13 19:15:18,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:18,683 INFO L93 Difference]: Finished difference Result 236 states and 282 transitions. [2019-10-13 19:15:18,684 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-13 19:15:18,684 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 135 [2019-10-13 19:15:18,684 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:18,685 INFO L225 Difference]: With dead ends: 236 [2019-10-13 19:15:18,685 INFO L226 Difference]: Without dead ends: 144 [2019-10-13 19:15:18,686 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 136 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=292, Invalid=520, Unknown=0, NotChecked=0, Total=812 [2019-10-13 19:15:18,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 144 states. [2019-10-13 19:15:18,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 144 to 142. [2019-10-13 19:15:18,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2019-10-13 19:15:18,692 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 165 transitions. [2019-10-13 19:15:18,692 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 165 transitions. Word has length 135 [2019-10-13 19:15:18,692 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:18,693 INFO L462 AbstractCegarLoop]: Abstraction has 142 states and 165 transitions. [2019-10-13 19:15:18,693 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 19:15:18,693 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 165 transitions. [2019-10-13 19:15:18,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2019-10-13 19:15:18,694 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:18,694 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:18,901 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:18,902 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:18,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:18,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1433392953, now seen corresponding path program 21 times [2019-10-13 19:15:18,903 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:18,903 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [851244758] [2019-10-13 19:15:18,903 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:18,904 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:18,904 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:18,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:19,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:19,482 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 903 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-13 19:15:19,488 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [851244758] [2019-10-13 19:15:19,489 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88194045] [2019-10-13 19:15:19,489 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:20,642 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 22 check-sat command(s) [2019-10-13 19:15:20,643 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:20,646 INFO L256 TraceCheckSpWp]: Trace formula consists of 349 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-13 19:15:20,648 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:20,680 INFO L134 CoverageAnalysis]: Checked inductivity of 1344 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 903 trivial. 0 not checked. [2019-10-13 19:15:20,683 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:20,683 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 24] total 28 [2019-10-13 19:15:20,683 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [980615602] [2019-10-13 19:15:20,684 INFO L442 AbstractCegarLoop]: Interpolant automaton has 28 states [2019-10-13 19:15:20,684 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:20,684 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2019-10-13 19:15:20,684 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2019-10-13 19:15:20,685 INFO L87 Difference]: Start difference. First operand 142 states and 165 transitions. Second operand 28 states. [2019-10-13 19:15:20,938 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:20,938 INFO L93 Difference]: Finished difference Result 246 states and 294 transitions. [2019-10-13 19:15:20,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-13 19:15:20,939 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 141 [2019-10-13 19:15:20,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:20,940 INFO L225 Difference]: With dead ends: 246 [2019-10-13 19:15:20,940 INFO L226 Difference]: Without dead ends: 150 [2019-10-13 19:15:20,940 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 142 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=316, Invalid=554, Unknown=0, NotChecked=0, Total=870 [2019-10-13 19:15:20,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-13 19:15:20,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 148. [2019-10-13 19:15:20,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 148 states. [2019-10-13 19:15:20,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 172 transitions. [2019-10-13 19:15:20,945 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 172 transitions. Word has length 141 [2019-10-13 19:15:20,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:20,945 INFO L462 AbstractCegarLoop]: Abstraction has 148 states and 172 transitions. [2019-10-13 19:15:20,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 28 states. [2019-10-13 19:15:20,945 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 172 transitions. [2019-10-13 19:15:20,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2019-10-13 19:15:20,946 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:20,946 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:21,152 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:21,152 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:21,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:21,153 INFO L82 PathProgramCache]: Analyzing trace with hash 1942005728, now seen corresponding path program 22 times [2019-10-13 19:15:21,153 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:21,153 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [386011658] [2019-10-13 19:15:21,154 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:21,154 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:21,154 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:21,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:21,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:21,534 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 484 trivial. 0 not checked. [2019-10-13 19:15:21,534 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [386011658] [2019-10-13 19:15:21,534 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1161671736] [2019-10-13 19:15:21,535 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:21,655 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 19:15:21,656 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:21,657 INFO L256 TraceCheckSpWp]: Trace formula consists of 363 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-13 19:15:21,660 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:21,695 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2019-10-13 19:15:21,695 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:21,695 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 25] total 29 [2019-10-13 19:15:21,695 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492569744] [2019-10-13 19:15:21,696 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 19:15:21,696 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:21,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 19:15:21,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2019-10-13 19:15:21,697 INFO L87 Difference]: Start difference. First operand 148 states and 172 transitions. Second operand 29 states. [2019-10-13 19:15:22,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:22,014 INFO L93 Difference]: Finished difference Result 256 states and 306 transitions. [2019-10-13 19:15:22,014 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-13 19:15:22,015 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 147 [2019-10-13 19:15:22,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:22,016 INFO L225 Difference]: With dead ends: 256 [2019-10-13 19:15:22,016 INFO L226 Difference]: Without dead ends: 156 [2019-10-13 19:15:22,018 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 177 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 110 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=341, Invalid=589, Unknown=0, NotChecked=0, Total=930 [2019-10-13 19:15:22,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2019-10-13 19:15:22,021 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 154. [2019-10-13 19:15:22,021 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 154 states. [2019-10-13 19:15:22,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 179 transitions. [2019-10-13 19:15:22,022 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 179 transitions. Word has length 147 [2019-10-13 19:15:22,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:22,023 INFO L462 AbstractCegarLoop]: Abstraction has 154 states and 179 transitions. [2019-10-13 19:15:22,023 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-13 19:15:22,023 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 179 transitions. [2019-10-13 19:15:22,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 154 [2019-10-13 19:15:22,024 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:22,024 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 23, 23, 23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:22,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:22,229 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:22,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:22,229 INFO L82 PathProgramCache]: Analyzing trace with hash 524846073, now seen corresponding path program 23 times [2019-10-13 19:15:22,230 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:22,230 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1878656138] [2019-10-13 19:15:22,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:22,230 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:22,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:22,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:22,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:22,743 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-13 19:15:22,743 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1878656138] [2019-10-13 19:15:22,743 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493291657] [2019-10-13 19:15:22,744 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:23,419 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 24 check-sat command(s) [2019-10-13 19:15:23,420 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:23,424 INFO L256 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 25 conjunts are in the unsatisfiable core [2019-10-13 19:15:23,426 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:23,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1610 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2019-10-13 19:15:23,454 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:23,454 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 26] total 30 [2019-10-13 19:15:23,454 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1079490539] [2019-10-13 19:15:23,454 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-13 19:15:23,455 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:23,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-13 19:15:23,455 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2019-10-13 19:15:23,455 INFO L87 Difference]: Start difference. First operand 154 states and 179 transitions. Second operand 30 states. [2019-10-13 19:15:23,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:23,722 INFO L93 Difference]: Finished difference Result 266 states and 318 transitions. [2019-10-13 19:15:23,723 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-13 19:15:23,723 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 153 [2019-10-13 19:15:23,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:23,724 INFO L225 Difference]: With dead ends: 266 [2019-10-13 19:15:23,724 INFO L226 Difference]: Without dead ends: 162 [2019-10-13 19:15:23,725 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 154 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=367, Invalid=625, Unknown=0, NotChecked=0, Total=992 [2019-10-13 19:15:23,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-10-13 19:15:23,728 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 160. [2019-10-13 19:15:23,729 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2019-10-13 19:15:23,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 186 transitions. [2019-10-13 19:15:23,730 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 186 transitions. Word has length 153 [2019-10-13 19:15:23,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:23,730 INFO L462 AbstractCegarLoop]: Abstraction has 160 states and 186 transitions. [2019-10-13 19:15:23,730 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-13 19:15:23,730 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 186 transitions. [2019-10-13 19:15:23,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 160 [2019-10-13 19:15:23,731 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:23,731 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:23,937 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:23,938 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:23,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:23,938 INFO L82 PathProgramCache]: Analyzing trace with hash 1885216018, now seen corresponding path program 24 times [2019-10-13 19:15:23,939 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:23,939 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2065459856] [2019-10-13 19:15:23,939 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:23,939 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:23,940 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:23,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:24,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:24,595 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 1176 refuted. 0 times theorem prover too weak. 576 trivial. 0 not checked. [2019-10-13 19:15:24,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2065459856] [2019-10-13 19:15:24,596 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2000812383] [2019-10-13 19:15:24,596 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:26,954 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-13 19:15:26,954 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:26,959 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-13 19:15:26,961 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:27,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 1176 trivial. 0 not checked. [2019-10-13 19:15:27,009 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:27,009 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 27] total 31 [2019-10-13 19:15:27,009 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2064688367] [2019-10-13 19:15:27,010 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-13 19:15:27,010 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:27,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-13 19:15:27,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2019-10-13 19:15:27,011 INFO L87 Difference]: Start difference. First operand 160 states and 186 transitions. Second operand 31 states. [2019-10-13 19:15:27,350 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:27,350 INFO L93 Difference]: Finished difference Result 276 states and 330 transitions. [2019-10-13 19:15:27,351 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 19:15:27,351 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 159 [2019-10-13 19:15:27,351 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:27,353 INFO L225 Difference]: With dead ends: 276 [2019-10-13 19:15:27,353 INFO L226 Difference]: Without dead ends: 168 [2019-10-13 19:15:27,354 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 160 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=394, Invalid=662, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 19:15:27,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2019-10-13 19:15:27,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 166. [2019-10-13 19:15:27,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2019-10-13 19:15:27,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 193 transitions. [2019-10-13 19:15:27,362 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 193 transitions. Word has length 159 [2019-10-13 19:15:27,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:27,362 INFO L462 AbstractCegarLoop]: Abstraction has 166 states and 193 transitions. [2019-10-13 19:15:27,362 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-13 19:15:27,363 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 193 transitions. [2019-10-13 19:15:27,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 166 [2019-10-13 19:15:27,364 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:27,365 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 25, 25, 25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:27,573 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:27,574 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:27,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:27,574 INFO L82 PathProgramCache]: Analyzing trace with hash -1965042901, now seen corresponding path program 25 times [2019-10-13 19:15:27,574 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:27,575 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [760615577] [2019-10-13 19:15:27,575 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:27,575 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:27,575 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:27,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:28,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:28,130 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2019-10-13 19:15:28,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [760615577] [2019-10-13 19:15:28,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019217767] [2019-10-13 19:15:28,131 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:28,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:28,229 INFO L256 TraceCheckSpWp]: Trace formula consists of 405 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-13 19:15:28,234 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:28,261 INFO L134 CoverageAnalysis]: Checked inductivity of 1900 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 1275 trivial. 0 not checked. [2019-10-13 19:15:28,261 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:28,261 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 28] total 32 [2019-10-13 19:15:28,262 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630076899] [2019-10-13 19:15:28,262 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-13 19:15:28,262 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:28,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-13 19:15:28,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2019-10-13 19:15:28,263 INFO L87 Difference]: Start difference. First operand 166 states and 193 transitions. Second operand 32 states. [2019-10-13 19:15:28,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:28,697 INFO L93 Difference]: Finished difference Result 286 states and 342 transitions. [2019-10-13 19:15:28,697 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-13 19:15:28,697 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 165 [2019-10-13 19:15:28,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:28,698 INFO L225 Difference]: With dead ends: 286 [2019-10-13 19:15:28,699 INFO L226 Difference]: Without dead ends: 174 [2019-10-13 19:15:28,700 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 166 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 125 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=422, Invalid=700, Unknown=0, NotChecked=0, Total=1122 [2019-10-13 19:15:28,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-13 19:15:28,704 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 172. [2019-10-13 19:15:28,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2019-10-13 19:15:28,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 200 transitions. [2019-10-13 19:15:28,706 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 200 transitions. Word has length 165 [2019-10-13 19:15:28,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:28,706 INFO L462 AbstractCegarLoop]: Abstraction has 172 states and 200 transitions. [2019-10-13 19:15:28,706 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-13 19:15:28,707 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 200 transitions. [2019-10-13 19:15:28,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 172 [2019-10-13 19:15:28,708 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:28,708 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:28,908 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:28,909 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:28,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:28,909 INFO L82 PathProgramCache]: Analyzing trace with hash -581695932, now seen corresponding path program 26 times [2019-10-13 19:15:28,909 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:28,909 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1606548760] [2019-10-13 19:15:28,910 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:28,910 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:28,910 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:28,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:29,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:29,556 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 1378 refuted. 0 times theorem prover too weak. 676 trivial. 0 not checked. [2019-10-13 19:15:29,556 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1606548760] [2019-10-13 19:15:29,557 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [806123403] [2019-10-13 19:15:29,557 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:29,666 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 19:15:29,666 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:29,668 INFO L256 TraceCheckSpWp]: Trace formula consists of 419 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-13 19:15:29,671 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:29,710 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 1378 trivial. 0 not checked. [2019-10-13 19:15:29,711 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:29,711 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 29] total 33 [2019-10-13 19:15:29,711 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1181431900] [2019-10-13 19:15:29,712 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-13 19:15:29,712 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:29,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-13 19:15:29,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 19:15:29,713 INFO L87 Difference]: Start difference. First operand 172 states and 200 transitions. Second operand 33 states. [2019-10-13 19:15:30,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:30,070 INFO L93 Difference]: Finished difference Result 296 states and 354 transitions. [2019-10-13 19:15:30,071 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-13 19:15:30,071 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 171 [2019-10-13 19:15:30,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:30,073 INFO L225 Difference]: With dead ends: 296 [2019-10-13 19:15:30,073 INFO L226 Difference]: Without dead ends: 180 [2019-10-13 19:15:30,075 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 130 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=451, Invalid=739, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 19:15:30,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 180 states. [2019-10-13 19:15:30,079 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 180 to 178. [2019-10-13 19:15:30,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 178 states. [2019-10-13 19:15:30,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 207 transitions. [2019-10-13 19:15:30,081 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 207 transitions. Word has length 171 [2019-10-13 19:15:30,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:30,081 INFO L462 AbstractCegarLoop]: Abstraction has 178 states and 207 transitions. [2019-10-13 19:15:30,081 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-13 19:15:30,081 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 207 transitions. [2019-10-13 19:15:30,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2019-10-13 19:15:30,082 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:30,082 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:30,287 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:30,287 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:30,288 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:30,288 INFO L82 PathProgramCache]: Analyzing trace with hash -1964435875, now seen corresponding path program 27 times [2019-10-13 19:15:30,288 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:30,288 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132407763] [2019-10-13 19:15:30,289 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:30,289 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:30,289 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:30,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:30,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:30,890 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-13 19:15:30,891 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132407763] [2019-10-13 19:15:30,891 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1976995531] [2019-10-13 19:15:30,892 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:32,366 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 28 check-sat command(s) [2019-10-13 19:15:32,366 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:32,372 INFO L256 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 29 conjunts are in the unsatisfiable core [2019-10-13 19:15:32,375 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:32,420 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 1485 trivial. 0 not checked. [2019-10-13 19:15:32,421 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:32,421 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 30] total 34 [2019-10-13 19:15:32,421 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834951824] [2019-10-13 19:15:32,423 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-13 19:15:32,423 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:32,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-13 19:15:32,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2019-10-13 19:15:32,424 INFO L87 Difference]: Start difference. First operand 178 states and 207 transitions. Second operand 34 states. [2019-10-13 19:15:32,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:32,799 INFO L93 Difference]: Finished difference Result 306 states and 366 transitions. [2019-10-13 19:15:32,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2019-10-13 19:15:32,799 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 177 [2019-10-13 19:15:32,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:32,800 INFO L225 Difference]: With dead ends: 306 [2019-10-13 19:15:32,801 INFO L226 Difference]: Without dead ends: 186 [2019-10-13 19:15:32,802 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=481, Invalid=779, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 19:15:32,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-10-13 19:15:32,808 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 184. [2019-10-13 19:15:32,808 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 184 states. [2019-10-13 19:15:32,809 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 184 states to 184 states and 214 transitions. [2019-10-13 19:15:32,809 INFO L78 Accepts]: Start accepts. Automaton has 184 states and 214 transitions. Word has length 177 [2019-10-13 19:15:32,810 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:32,810 INFO L462 AbstractCegarLoop]: Abstraction has 184 states and 214 transitions. [2019-10-13 19:15:32,810 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-13 19:15:32,810 INFO L276 IsEmpty]: Start isEmpty. Operand 184 states and 214 transitions. [2019-10-13 19:15:32,811 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 184 [2019-10-13 19:15:32,811 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:32,811 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:33,017 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:33,018 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:33,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:33,018 INFO L82 PathProgramCache]: Analyzing trace with hash 1433756534, now seen corresponding path program 28 times [2019-10-13 19:15:33,019 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:33,019 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [881093714] [2019-10-13 19:15:33,019 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:33,019 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:33,019 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:33,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:33,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:33,611 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 784 trivial. 0 not checked. [2019-10-13 19:15:33,611 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [881093714] [2019-10-13 19:15:33,611 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215240078] [2019-10-13 19:15:33,611 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:33,723 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 19:15:33,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:33,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-13 19:15:33,728 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:33,763 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 1596 trivial. 0 not checked. [2019-10-13 19:15:33,764 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:33,764 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 31] total 35 [2019-10-13 19:15:33,764 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1834792163] [2019-10-13 19:15:33,765 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-13 19:15:33,765 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:33,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-13 19:15:33,766 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 19:15:33,766 INFO L87 Difference]: Start difference. First operand 184 states and 214 transitions. Second operand 35 states. [2019-10-13 19:15:34,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:34,178 INFO L93 Difference]: Finished difference Result 316 states and 378 transitions. [2019-10-13 19:15:34,178 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-13 19:15:34,178 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 183 [2019-10-13 19:15:34,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:34,179 INFO L225 Difference]: With dead ends: 316 [2019-10-13 19:15:34,180 INFO L226 Difference]: Without dead ends: 192 [2019-10-13 19:15:34,181 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 219 GetRequests, 184 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=512, Invalid=820, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 19:15:34,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2019-10-13 19:15:34,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 190. [2019-10-13 19:15:34,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2019-10-13 19:15:34,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 221 transitions. [2019-10-13 19:15:34,188 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 221 transitions. Word has length 183 [2019-10-13 19:15:34,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:34,189 INFO L462 AbstractCegarLoop]: Abstraction has 190 states and 221 transitions. [2019-10-13 19:15:34,189 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-13 19:15:34,189 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 221 transitions. [2019-10-13 19:15:34,190 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2019-10-13 19:15:34,190 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:34,190 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 29, 29, 29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:34,395 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:34,395 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:34,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:34,396 INFO L82 PathProgramCache]: Analyzing trace with hash 125259151, now seen corresponding path program 29 times [2019-10-13 19:15:34,396 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:34,396 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1407721135] [2019-10-13 19:15:34,396 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:34,397 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:34,397 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:34,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:34,987 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:35,042 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-13 19:15:35,042 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1407721135] [2019-10-13 19:15:35,042 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [922230105] [2019-10-13 19:15:35,043 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:37,046 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 30 check-sat command(s) [2019-10-13 19:15:37,046 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 19:15:37,053 INFO L256 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 31 conjunts are in the unsatisfiable core [2019-10-13 19:15:37,055 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 19:15:37,097 INFO L134 CoverageAnalysis]: Checked inductivity of 2552 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2019-10-13 19:15:37,097 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 19:15:37,097 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 32] total 36 [2019-10-13 19:15:37,097 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806029322] [2019-10-13 19:15:37,098 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-13 19:15:37,098 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 19:15:37,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-13 19:15:37,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 19:15:37,099 INFO L87 Difference]: Start difference. First operand 190 states and 221 transitions. Second operand 36 states. [2019-10-13 19:15:37,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 19:15:37,603 INFO L93 Difference]: Finished difference Result 326 states and 390 transitions. [2019-10-13 19:15:37,604 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-13 19:15:37,604 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 189 [2019-10-13 19:15:37,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 19:15:37,606 INFO L225 Difference]: With dead ends: 326 [2019-10-13 19:15:37,606 INFO L226 Difference]: Without dead ends: 198 [2019-10-13 19:15:37,610 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 145 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=544, Invalid=862, Unknown=0, NotChecked=0, Total=1406 [2019-10-13 19:15:37,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2019-10-13 19:15:37,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 196. [2019-10-13 19:15:37,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2019-10-13 19:15:37,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 228 transitions. [2019-10-13 19:15:37,623 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 228 transitions. Word has length 189 [2019-10-13 19:15:37,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 19:15:37,623 INFO L462 AbstractCegarLoop]: Abstraction has 196 states and 228 transitions. [2019-10-13 19:15:37,624 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-13 19:15:37,624 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 228 transitions. [2019-10-13 19:15:37,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2019-10-13 19:15:37,626 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 19:15:37,626 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 30, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 19:15:37,835 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 19:15:37,836 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 19:15:37,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 19:15:37,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1578448040, now seen corresponding path program 30 times [2019-10-13 19:15:37,837 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 19:15:37,837 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [830934847] [2019-10-13 19:15:37,837 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:37,837 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 19:15:37,837 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 19:15:37,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:38,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 19:15:38,433 INFO L134 CoverageAnalysis]: Checked inductivity of 2730 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 900 trivial. 0 not checked. [2019-10-13 19:15:38,433 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [830934847] [2019-10-13 19:15:38,433 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188487838] [2019-10-13 19:15:38,433 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true