/usr/bin/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/array-examples/standard_init3_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:43:51,509 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:43:51,512 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:43:51,532 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:43:51,532 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:43:51,534 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:43:51,536 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:43:51,543 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:43:51,545 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:43:51,546 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:43:51,547 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:43:51,549 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:43:51,550 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:43:51,551 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:43:51,552 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:43:51,553 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:43:51,553 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:43:51,554 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:43:51,556 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:43:51,557 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:43:51,559 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:43:51,560 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:43:51,561 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:43:51,562 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:43:51,564 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:43:51,567 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:43:51,568 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:43:51,568 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:43:51,569 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:43:51,570 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:43:51,570 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:43:51,571 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:43:51,571 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:43:51,571 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:43:51,572 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:43:51,573 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:43:51,574 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 [2019-11-06 18:43:51,588 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:43:51,588 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:43:51,589 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:43:51,589 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:43:51,590 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:43:51,590 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:43:51,590 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:43:51,590 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:43:51,590 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:43:51,591 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:43:51,591 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:43:51,591 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:43:51,591 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:43:51,591 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:43:51,592 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:43:51,592 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:43:51,592 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:43:51,592 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:43:51,592 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:43:51,593 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:43:51,593 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:43:51,593 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:43:51,593 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:43:51,594 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:43:51,594 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:43:51,594 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:43:51,594 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:43:51,594 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:43:51,595 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:43:51,863 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:43:51,876 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:43:51,879 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:43:51,881 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:43:51,881 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:43:51,882 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init3_ground-2.i [2019-11-06 18:43:51,943 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d86a9578/e3b3f7788c8d444fb642335b31cb3356/FLAG8779288f9 [2019-11-06 18:43:52,379 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:43:52,379 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init3_ground-2.i [2019-11-06 18:43:52,387 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d86a9578/e3b3f7788c8d444fb642335b31cb3356/FLAG8779288f9 [2019-11-06 18:43:52,766 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/6d86a9578/e3b3f7788c8d444fb642335b31cb3356 [2019-11-06 18:43:52,777 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:43:52,778 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:43:52,779 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:52,780 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:43:52,783 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:43:52,784 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:52" (1/1) ... [2019-11-06 18:43:52,787 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@49d89586 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:52, skipping insertion in model container [2019-11-06 18:43:52,787 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:52" (1/1) ... [2019-11-06 18:43:52,795 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:43:52,812 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:43:53,028 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:53,033 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:43:53,053 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:53,069 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:43:53,069 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53 WrapperNode [2019-11-06 18:43:53,069 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:53,070 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:43:53,070 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:43:53,070 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:43:53,172 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,172 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,179 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,179 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,190 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,199 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,200 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (1/1) ... [2019-11-06 18:43:53,202 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:43:53,203 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:43:53,203 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:43:53,203 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:43:53,204 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (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 [2019-11-06 18:43:53,261 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:43:53,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:43:53,262 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:43:53,262 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:43:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:43:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:43:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:43:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:43:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:43:53,263 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:43:53,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:43:53,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:43:53,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:43:53,487 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:43:53,493 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-11-06 18:43:53,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:53 BoogieIcfgContainer [2019-11-06 18:43:53,498 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:43:53,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:43:53,500 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:43:53,511 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:43:53,511 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:43:52" (1/3) ... [2019-11-06 18:43:53,515 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37f5130d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:53, skipping insertion in model container [2019-11-06 18:43:53,516 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:53" (2/3) ... [2019-11-06 18:43:53,517 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37f5130d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:53, skipping insertion in model container [2019-11-06 18:43:53,520 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:53" (3/3) ... [2019-11-06 18:43:53,522 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init3_ground-2.i [2019-11-06 18:43:53,551 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:43:53,567 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:43:53,586 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:43:53,611 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:43:53,612 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:43:53,612 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:43:53,612 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:43:53,612 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:43:53,612 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:43:53,612 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:43:53,613 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:43:53,628 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states. [2019-11-06 18:43:53,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:43:53,634 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:53,635 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:53,636 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:53,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:53,641 INFO L82 PathProgramCache]: Analyzing trace with hash 578824766, now seen corresponding path program 1 times [2019-11-06 18:43:53,648 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:53,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [406345648] [2019-11-06 18:43:53,649 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:53,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:53,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:53,808 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:53,809 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [406345648] [2019-11-06 18:43:53,810 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:53,810 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:43:53,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1016320027] [2019-11-06 18:43:53,816 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:43:53,816 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:53,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:43:53,831 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:53,833 INFO L87 Difference]: Start difference. First operand 27 states. Second operand 3 states. [2019-11-06 18:43:53,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:53,948 INFO L93 Difference]: Finished difference Result 47 states and 62 transitions. [2019-11-06 18:43:53,954 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:43:53,956 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-11-06 18:43:53,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:53,964 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:43:53,965 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:43:53,969 INFO L630 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 [2019-11-06 18:43:53,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:43:54,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:43:54,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:43:54,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 25 transitions. [2019-11-06 18:43:54,005 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 25 transitions. Word has length 17 [2019-11-06 18:43:54,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:54,006 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 25 transitions. [2019-11-06 18:43:54,006 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:43:54,006 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 25 transitions. [2019-11-06 18:43:54,007 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:43:54,007 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:54,008 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:54,008 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:54,009 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:54,009 INFO L82 PathProgramCache]: Analyzing trace with hash -823304390, now seen corresponding path program 1 times [2019-11-06 18:43:54,009 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:54,010 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [588123489] [2019-11-06 18:43:54,010 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:54,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:54,077 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [588123489] [2019-11-06 18:43:54,077 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:54,077 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:43:54,078 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [109403037] [2019-11-06 18:43:54,080 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:43:54,081 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:54,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:43:54,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:54,082 INFO L87 Difference]: Start difference. First operand 22 states and 25 transitions. Second operand 4 states. [2019-11-06 18:43:54,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:54,167 INFO L93 Difference]: Finished difference Result 40 states and 48 transitions. [2019-11-06 18:43:54,167 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:43:54,168 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-11-06 18:43:54,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:54,170 INFO L225 Difference]: With dead ends: 40 [2019-11-06 18:43:54,170 INFO L226 Difference]: Without dead ends: 25 [2019-11-06 18:43:54,172 INFO L630 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 [2019-11-06 18:43:54,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-11-06 18:43:54,177 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-11-06 18:43:54,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-11-06 18:43:54,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-11-06 18:43:54,179 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2019-11-06 18:43:54,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:54,179 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-11-06 18:43:54,180 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:43:54,180 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-11-06 18:43:54,181 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-11-06 18:43:54,181 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:54,181 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:54,181 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:54,182 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:54,182 INFO L82 PathProgramCache]: Analyzing trace with hash 3753729, now seen corresponding path program 1 times [2019-11-06 18:43:54,182 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:54,182 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [45135187] [2019-11-06 18:43:54,183 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:54,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,283 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:43:54,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [45135187] [2019-11-06 18:43:54,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787741466] [2019-11-06 18:43:54,284 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 [2019-11-06 18:43:54,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,353 INFO L256 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:43:54,359 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:54,388 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-11-06 18:43:54,389 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:54,389 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:43:54,389 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082646008] [2019-11-06 18:43:54,390 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:43:54,390 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:54,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:43:54,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:54,391 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 6 states. [2019-11-06 18:43:54,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:54,484 INFO L93 Difference]: Finished difference Result 45 states and 53 transitions. [2019-11-06 18:43:54,484 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:43:54,484 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2019-11-06 18:43:54,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:54,485 INFO L225 Difference]: With dead ends: 45 [2019-11-06 18:43:54,486 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:43:54,486 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:54,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:43:54,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-06 18:43:54,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:43:54,494 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-11-06 18:43:54,494 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 20 [2019-11-06 18:43:54,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:54,494 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-11-06 18:43:54,495 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:43:54,495 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-11-06 18:43:54,496 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:43:54,496 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:54,496 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:54,699 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:54,699 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:54,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:54,700 INFO L82 PathProgramCache]: Analyzing trace with hash -1185149478, now seen corresponding path program 2 times [2019-11-06 18:43:54,700 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:54,701 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [527565545] [2019-11-06 18:43:54,701 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:54,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:54,794 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:43:54,794 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [527565545] [2019-11-06 18:43:54,794 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [686379128] [2019-11-06 18:43:54,795 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 [2019-11-06 18:43:54,860 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:54,860 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:54,861 INFO L256 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:43:54,863 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:54,882 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:43:54,883 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:54,883 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:43:54,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [368683456] [2019-11-06 18:43:54,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:43:54,884 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:54,884 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:43:54,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:54,885 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2019-11-06 18:43:54,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:54,978 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2019-11-06 18:43:54,979 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:43:54,979 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-11-06 18:43:54,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:54,980 INFO L225 Difference]: With dead ends: 50 [2019-11-06 18:43:54,980 INFO L226 Difference]: Without dead ends: 31 [2019-11-06 18:43:54,981 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:54,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-11-06 18:43:54,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-11-06 18:43:54,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-11-06 18:43:54,987 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 34 transitions. [2019-11-06 18:43:54,987 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 34 transitions. Word has length 23 [2019-11-06 18:43:54,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:54,988 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 34 transitions. [2019-11-06 18:43:54,988 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:43:54,988 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 34 transitions. [2019-11-06 18:43:54,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2019-11-06 18:43:54,989 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:54,989 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:55,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:55,193 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:55,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:55,194 INFO L82 PathProgramCache]: Analyzing trace with hash 455820257, now seen corresponding path program 3 times [2019-11-06 18:43:55,194 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:55,194 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [690884453] [2019-11-06 18:43:55,194 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:55,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:55,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:55,326 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-06 18:43:55,327 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [690884453] [2019-11-06 18:43:55,327 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [453443909] [2019-11-06 18:43:55,327 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 [2019-11-06 18:43:55,371 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:43:55,371 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:55,372 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:43:55,374 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:55,392 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2019-11-06 18:43:55,393 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:55,394 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:43:55,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945779961] [2019-11-06 18:43:55,395 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:43:55,396 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:55,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:43:55,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:55,396 INFO L87 Difference]: Start difference. First operand 31 states and 34 transitions. Second operand 8 states. [2019-11-06 18:43:55,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:55,491 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2019-11-06 18:43:55,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:43:55,492 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 26 [2019-11-06 18:43:55,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:55,493 INFO L225 Difference]: With dead ends: 55 [2019-11-06 18:43:55,493 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:43:55,494 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:55,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:43:55,499 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-06 18:43:55,499 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:43:55,500 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-11-06 18:43:55,500 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 26 [2019-11-06 18:43:55,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:55,501 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-11-06 18:43:55,501 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:43:55,501 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-11-06 18:43:55,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 18:43:55,502 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:55,502 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:55,705 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:55,706 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:55,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:55,706 INFO L82 PathProgramCache]: Analyzing trace with hash 1002382458, now seen corresponding path program 4 times [2019-11-06 18:43:55,706 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:55,706 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1235325656] [2019-11-06 18:43:55,707 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:55,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:55,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:55,853 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-11-06 18:43:55,857 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1235325656] [2019-11-06 18:43:55,857 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1706659731] [2019-11-06 18:43:55,858 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 [2019-11-06 18:43:55,904 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:55,904 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:55,906 INFO L256 TraceCheckSpWp]: Trace formula consists of 106 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:43:55,908 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:55,925 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2019-11-06 18:43:55,925 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:55,925 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:43:55,926 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496272735] [2019-11-06 18:43:55,926 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:43:55,927 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:55,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:43:55,927 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:55,927 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 9 states. [2019-11-06 18:43:56,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:56,044 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2019-11-06 18:43:56,044 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:43:56,045 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-11-06 18:43:56,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:56,045 INFO L225 Difference]: With dead ends: 60 [2019-11-06 18:43:56,046 INFO L226 Difference]: Without dead ends: 37 [2019-11-06 18:43:56,047 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:56,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-11-06 18:43:56,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2019-11-06 18:43:56,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-11-06 18:43:56,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-11-06 18:43:56,056 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 29 [2019-11-06 18:43:56,057 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:56,057 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-11-06 18:43:56,057 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:43:56,057 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-11-06 18:43:56,058 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-11-06 18:43:56,058 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:56,059 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:56,262 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:56,262 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:56,263 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:56,263 INFO L82 PathProgramCache]: Analyzing trace with hash -1395779391, now seen corresponding path program 5 times [2019-11-06 18:43:56,263 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:56,264 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1934624667] [2019-11-06 18:43:56,264 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:56,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:56,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:56,377 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:43:56,377 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1934624667] [2019-11-06 18:43:56,378 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315605544] [2019-11-06 18:43:56,378 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 [2019-11-06 18:43:56,566 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:43:56,566 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:56,568 INFO L256 TraceCheckSpWp]: Trace formula consists of 118 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:43:56,570 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:56,585 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2019-11-06 18:43:56,586 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:56,586 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:43:56,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231360341] [2019-11-06 18:43:56,587 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:43:56,587 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:56,587 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:43:56,588 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:56,590 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 10 states. [2019-11-06 18:43:56,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:56,700 INFO L93 Difference]: Finished difference Result 65 states and 73 transitions. [2019-11-06 18:43:56,700 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:43:56,700 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2019-11-06 18:43:56,700 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:56,701 INFO L225 Difference]: With dead ends: 65 [2019-11-06 18:43:56,701 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 18:43:56,702 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:56,702 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 18:43:56,706 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-11-06 18:43:56,707 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:43:56,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-11-06 18:43:56,708 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 32 [2019-11-06 18:43:56,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:56,709 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-11-06 18:43:56,709 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:43:56,709 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-11-06 18:43:56,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:43:56,710 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:56,710 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:56,913 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:56,914 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:56,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:56,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1957995290, now seen corresponding path program 6 times [2019-11-06 18:43:56,915 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:56,916 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007132660] [2019-11-06 18:43:56,916 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:56,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,054 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-06 18:43:57,054 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007132660] [2019-11-06 18:43:57,055 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827475811] [2019-11-06 18:43:57,055 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 [2019-11-06 18:43:57,169 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:43:57,169 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:57,171 INFO L256 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:43:57,173 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:57,191 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2019-11-06 18:43:57,191 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:57,191 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:43:57,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [684690867] [2019-11-06 18:43:57,194 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:43:57,194 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:57,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:43:57,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:57,197 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 11 states. [2019-11-06 18:43:57,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:57,289 INFO L93 Difference]: Finished difference Result 70 states and 78 transitions. [2019-11-06 18:43:57,289 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:43:57,290 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2019-11-06 18:43:57,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:57,290 INFO L225 Difference]: With dead ends: 70 [2019-11-06 18:43:57,291 INFO L226 Difference]: Without dead ends: 43 [2019-11-06 18:43:57,291 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:57,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-11-06 18:43:57,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2019-11-06 18:43:57,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-11-06 18:43:57,297 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 46 transitions. [2019-11-06 18:43:57,297 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 46 transitions. Word has length 35 [2019-11-06 18:43:57,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:57,297 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 46 transitions. [2019-11-06 18:43:57,298 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:43:57,298 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 46 transitions. [2019-11-06 18:43:57,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2019-11-06 18:43:57,299 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:57,299 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:57,504 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:57,504 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:57,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:57,505 INFO L82 PathProgramCache]: Analyzing trace with hash -1474050655, now seen corresponding path program 7 times [2019-11-06 18:43:57,505 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:57,506 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [306168102] [2019-11-06 18:43:57,506 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:57,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,607 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-06 18:43:57,607 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [306168102] [2019-11-06 18:43:57,607 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2102646791] [2019-11-06 18:43:57,608 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 [2019-11-06 18:43:57,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,661 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:43:57,663 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:57,688 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-11-06 18:43:57,688 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:57,688 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:43:57,689 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036935013] [2019-11-06 18:43:57,689 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:43:57,689 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:57,690 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:43:57,690 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:57,690 INFO L87 Difference]: Start difference. First operand 43 states and 46 transitions. Second operand 12 states. [2019-11-06 18:43:57,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:57,814 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2019-11-06 18:43:57,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:43:57,815 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 38 [2019-11-06 18:43:57,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:57,816 INFO L225 Difference]: With dead ends: 75 [2019-11-06 18:43:57,816 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:43:57,817 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:57,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:43:57,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-06 18:43:57,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:43:57,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-11-06 18:43:57,823 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 38 [2019-11-06 18:43:57,823 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:57,823 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-11-06 18:43:57,823 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:43:57,824 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-11-06 18:43:57,824 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-06 18:43:57,824 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:57,825 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:58,028 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:58,028 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:58,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:58,029 INFO L82 PathProgramCache]: Analyzing trace with hash 2136639930, now seen corresponding path program 8 times [2019-11-06 18:43:58,029 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:58,030 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846137706] [2019-11-06 18:43:58,030 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:58,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:58,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:58,171 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-11-06 18:43:58,172 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846137706] [2019-11-06 18:43:58,172 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905845088] [2019-11-06 18:43:58,172 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 [2019-11-06 18:43:58,228 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:58,228 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:58,229 INFO L256 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:43:58,234 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:58,247 INFO L134 CoverageAnalysis]: Checked inductivity of 108 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-11-06 18:43:58,248 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:58,248 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:43:58,248 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580272231] [2019-11-06 18:43:58,249 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:43:58,249 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:58,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:43:58,249 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:58,249 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 13 states. [2019-11-06 18:43:58,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:58,378 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-11-06 18:43:58,379 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:43:58,379 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2019-11-06 18:43:58,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:58,380 INFO L225 Difference]: With dead ends: 80 [2019-11-06 18:43:58,380 INFO L226 Difference]: Without dead ends: 49 [2019-11-06 18:43:58,381 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:58,381 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-11-06 18:43:58,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2019-11-06 18:43:58,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2019-11-06 18:43:58,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2019-11-06 18:43:58,388 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 41 [2019-11-06 18:43:58,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:58,388 INFO L462 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2019-11-06 18:43:58,388 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:43:58,388 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2019-11-06 18:43:58,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-11-06 18:43:58,389 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:58,390 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:58,592 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:58,593 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:58,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:58,593 INFO L82 PathProgramCache]: Analyzing trace with hash -1548858751, now seen corresponding path program 9 times [2019-11-06 18:43:58,594 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:58,594 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1728975010] [2019-11-06 18:43:58,594 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:58,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:58,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:58,751 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 90 trivial. 0 not checked. [2019-11-06 18:43:58,752 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1728975010] [2019-11-06 18:43:58,752 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [623877943] [2019-11-06 18:43:58,752 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 [2019-11-06 18:43:59,138 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:43:59,138 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:59,140 INFO L256 TraceCheckSpWp]: Trace formula consists of 166 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:43:59,142 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:59,170 INFO L134 CoverageAnalysis]: Checked inductivity of 135 backedges. 9 proven. 45 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-11-06 18:43:59,171 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:59,171 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2019-11-06 18:43:59,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198715855] [2019-11-06 18:43:59,171 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:59,172 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:59,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:59,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:59,172 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2019-11-06 18:43:59,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:59,302 INFO L93 Difference]: Finished difference Result 85 states and 93 transitions. [2019-11-06 18:43:59,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:59,303 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2019-11-06 18:43:59,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:59,303 INFO L225 Difference]: With dead ends: 85 [2019-11-06 18:43:59,303 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 18:43:59,304 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:59,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 18:43:59,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-11-06 18:43:59,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:43:59,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-11-06 18:43:59,312 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 44 [2019-11-06 18:43:59,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:59,312 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-11-06 18:43:59,312 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:59,312 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-11-06 18:43:59,313 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:43:59,313 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:59,313 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:59,517 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:59,518 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:59,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:59,519 INFO L82 PathProgramCache]: Analyzing trace with hash 1397676122, now seen corresponding path program 10 times [2019-11-06 18:43:59,519 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:59,519 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [300107744] [2019-11-06 18:43:59,519 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:59,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,642 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-11-06 18:43:59,642 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [300107744] [2019-11-06 18:43:59,642 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1021435263] [2019-11-06 18:43:59,642 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 [2019-11-06 18:43:59,691 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:59,691 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:59,693 INFO L256 TraceCheckSpWp]: Trace formula consists of 178 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:43:59,695 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:59,724 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2019-11-06 18:43:59,724 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:59,725 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:43:59,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072175288] [2019-11-06 18:43:59,725 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:59,725 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:59,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:59,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:59,726 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 15 states. [2019-11-06 18:43:59,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:59,843 INFO L93 Difference]: Finished difference Result 90 states and 98 transitions. [2019-11-06 18:43:59,843 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:59,844 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 47 [2019-11-06 18:43:59,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:59,845 INFO L225 Difference]: With dead ends: 90 [2019-11-06 18:43:59,845 INFO L226 Difference]: Without dead ends: 55 [2019-11-06 18:43:59,846 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:59,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-11-06 18:43:59,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2019-11-06 18:43:59,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2019-11-06 18:43:59,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2019-11-06 18:43:59,853 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 47 [2019-11-06 18:43:59,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:59,854 INFO L462 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2019-11-06 18:43:59,854 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:59,854 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2019-11-06 18:43:59,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2019-11-06 18:43:59,855 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:59,855 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:00,058 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:00,059 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:00,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:00,059 INFO L82 PathProgramCache]: Analyzing trace with hash -110123167, now seen corresponding path program 11 times [2019-11-06 18:44:00,060 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:00,060 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1397902867] [2019-11-06 18:44:00,060 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:00,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,245 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-11-06 18:44:00,246 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1397902867] [2019-11-06 18:44:00,246 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [116142008] [2019-11-06 18:44:00,246 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 [2019-11-06 18:44:03,428 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:44:03,429 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:03,435 INFO L256 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:44:03,437 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:03,463 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-11-06 18:44:03,463 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:03,463 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:44:03,464 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114645757] [2019-11-06 18:44:03,464 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:44:03,464 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:03,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:44:03,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:44:03,465 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 16 states. [2019-11-06 18:44:03,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:03,577 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2019-11-06 18:44:03,578 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:44:03,578 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 50 [2019-11-06 18:44:03,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:03,579 INFO L225 Difference]: With dead ends: 95 [2019-11-06 18:44:03,580 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 18:44:03,581 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:44:03,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 18:44:03,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-11-06 18:44:03,587 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 18:44:03,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 61 transitions. [2019-11-06 18:44:03,588 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 61 transitions. Word has length 50 [2019-11-06 18:44:03,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:03,589 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 61 transitions. [2019-11-06 18:44:03,589 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:44:03,589 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 61 transitions. [2019-11-06 18:44:03,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 18:44:03,590 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:03,590 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:03,796 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:03,796 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:03,797 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:03,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1531998470, now seen corresponding path program 12 times [2019-11-06 18:44:03,797 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:03,798 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1936529775] [2019-11-06 18:44:03,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:03,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:03,958 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 156 trivial. 0 not checked. [2019-11-06 18:44:03,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1936529775] [2019-11-06 18:44:03,958 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064881390] [2019-11-06 18:44:03,958 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 [2019-11-06 18:44:08,888 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:44:08,888 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:08,898 INFO L256 TraceCheckSpWp]: Trace formula consists of 202 conjuncts, 20 conjunts are in the unsatisfiable core [2019-11-06 18:44:08,900 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:08,938 INFO L134 CoverageAnalysis]: Checked inductivity of 234 backedges. 24 proven. 78 refuted. 0 times theorem prover too weak. 132 trivial. 0 not checked. [2019-11-06 18:44:08,938 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:08,938 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2019-11-06 18:44:08,939 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [537128314] [2019-11-06 18:44:08,939 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:44:08,939 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:08,940 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:44:08,940 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:08,940 INFO L87 Difference]: Start difference. First operand 58 states and 61 transitions. Second operand 18 states. [2019-11-06 18:44:09,112 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:09,112 INFO L93 Difference]: Finished difference Result 100 states and 108 transitions. [2019-11-06 18:44:09,113 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:44:09,113 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 53 [2019-11-06 18:44:09,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:09,114 INFO L225 Difference]: With dead ends: 100 [2019-11-06 18:44:09,114 INFO L226 Difference]: Without dead ends: 61 [2019-11-06 18:44:09,114 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:09,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2019-11-06 18:44:09,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2019-11-06 18:44:09,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-11-06 18:44:09,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2019-11-06 18:44:09,125 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 53 [2019-11-06 18:44:09,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:09,126 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2019-11-06 18:44:09,126 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:44:09,126 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2019-11-06 18:44:09,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2019-11-06 18:44:09,129 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:09,129 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:09,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:09,340 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:09,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:09,340 INFO L82 PathProgramCache]: Analyzing trace with hash -420881343, now seen corresponding path program 13 times [2019-11-06 18:44:09,341 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:09,341 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989008948] [2019-11-06 18:44:09,341 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:09,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:09,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:09,514 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-11-06 18:44:09,515 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989008948] [2019-11-06 18:44:09,515 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434275291] [2019-11-06 18:44:09,515 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 [2019-11-06 18:44:09,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:09,595 INFO L256 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:44:09,598 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:09,640 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 182 trivial. 0 not checked. [2019-11-06 18:44:09,641 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:09,641 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:44:09,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318863481] [2019-11-06 18:44:09,642 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:44:09,642 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:09,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:44:09,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:09,644 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 18 states. [2019-11-06 18:44:09,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:09,813 INFO L93 Difference]: Finished difference Result 105 states and 113 transitions. [2019-11-06 18:44:09,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:44:09,814 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 56 [2019-11-06 18:44:09,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:09,815 INFO L225 Difference]: With dead ends: 105 [2019-11-06 18:44:09,815 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:44:09,819 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:44:09,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:44:09,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-11-06 18:44:09,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-06 18:44:09,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 67 transitions. [2019-11-06 18:44:09,831 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 67 transitions. Word has length 56 [2019-11-06 18:44:09,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:09,831 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 67 transitions. [2019-11-06 18:44:09,832 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:44:09,832 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 67 transitions. [2019-11-06 18:44:09,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:44:09,833 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:09,838 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:10,042 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:10,042 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:10,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:10,043 INFO L82 PathProgramCache]: Analyzing trace with hash -1004884582, now seen corresponding path program 14 times [2019-11-06 18:44:10,043 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:10,043 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665627589] [2019-11-06 18:44:10,044 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:10,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,251 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-11-06 18:44:10,251 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665627589] [2019-11-06 18:44:10,251 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618841845] [2019-11-06 18:44:10,251 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 [2019-11-06 18:44:10,318 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:44:10,318 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:10,320 INFO L256 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:44:10,326 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:10,350 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-11-06 18:44:10,350 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:10,351 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:44:10,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1037636772] [2019-11-06 18:44:10,351 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:44:10,352 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:10,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:44:10,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:44:10,357 INFO L87 Difference]: Start difference. First operand 64 states and 67 transitions. Second operand 19 states. [2019-11-06 18:44:10,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:10,553 INFO L93 Difference]: Finished difference Result 110 states and 118 transitions. [2019-11-06 18:44:10,554 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:44:10,554 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 59 [2019-11-06 18:44:10,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:10,555 INFO L225 Difference]: With dead ends: 110 [2019-11-06 18:44:10,555 INFO L226 Difference]: Without dead ends: 67 [2019-11-06 18:44:10,556 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:44:10,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-11-06 18:44:10,561 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2019-11-06 18:44:10,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-11-06 18:44:10,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-11-06 18:44:10,562 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 59 [2019-11-06 18:44:10,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:10,562 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-11-06 18:44:10,562 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:44:10,562 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-11-06 18:44:10,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-11-06 18:44:10,563 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:10,563 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:10,766 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:10,767 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:10,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:10,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1390483167, now seen corresponding path program 15 times [2019-11-06 18:44:10,768 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:10,768 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2098258460] [2019-11-06 18:44:10,768 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:10,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:10,954 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-11-06 18:44:10,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2098258460] [2019-11-06 18:44:10,954 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412384094] [2019-11-06 18:44:10,954 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 [2019-11-06 18:44:17,997 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:44:17,997 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:18,003 INFO L256 TraceCheckSpWp]: Trace formula consists of 238 conjuncts, 27 conjunts are in the unsatisfiable core [2019-11-06 18:44:18,004 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:18,019 INFO L134 CoverageAnalysis]: Checked inductivity of 360 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 240 trivial. 0 not checked. [2019-11-06 18:44:18,020 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:18,020 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:44:18,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [624127780] [2019-11-06 18:44:18,021 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:44:18,021 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:18,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:44:18,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:44:18,022 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 20 states. [2019-11-06 18:44:18,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:18,223 INFO L93 Difference]: Finished difference Result 115 states and 123 transitions. [2019-11-06 18:44:18,223 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:44:18,223 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 62 [2019-11-06 18:44:18,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:18,225 INFO L225 Difference]: With dead ends: 115 [2019-11-06 18:44:18,225 INFO L226 Difference]: Without dead ends: 70 [2019-11-06 18:44:18,226 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:44:18,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2019-11-06 18:44:18,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2019-11-06 18:44:18,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2019-11-06 18:44:18,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 73 transitions. [2019-11-06 18:44:18,234 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 73 transitions. Word has length 62 [2019-11-06 18:44:18,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:18,234 INFO L462 AbstractCegarLoop]: Abstraction has 70 states and 73 transitions. [2019-11-06 18:44:18,234 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:44:18,234 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 73 transitions. [2019-11-06 18:44:18,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-11-06 18:44:18,235 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:18,235 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:18,436 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:18,436 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:18,436 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:18,437 INFO L82 PathProgramCache]: Analyzing trace with hash 2125345850, now seen corresponding path program 16 times [2019-11-06 18:44:18,437 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:18,437 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1387588315] [2019-11-06 18:44:18,438 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:18,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:18,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:18,661 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-11-06 18:44:18,661 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1387588315] [2019-11-06 18:44:18,661 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779973430] [2019-11-06 18:44:18,662 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 [2019-11-06 18:44:18,724 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:44:18,724 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:18,725 INFO L256 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:44:18,730 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:18,746 INFO L134 CoverageAnalysis]: Checked inductivity of 408 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 272 trivial. 0 not checked. [2019-11-06 18:44:18,746 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:18,747 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:44:18,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813742767] [2019-11-06 18:44:18,747 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:44:18,747 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:18,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:44:18,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:44:18,748 INFO L87 Difference]: Start difference. First operand 70 states and 73 transitions. Second operand 21 states. [2019-11-06 18:44:18,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:18,937 INFO L93 Difference]: Finished difference Result 120 states and 128 transitions. [2019-11-06 18:44:18,939 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:44:18,939 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 65 [2019-11-06 18:44:18,939 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:18,939 INFO L225 Difference]: With dead ends: 120 [2019-11-06 18:44:18,940 INFO L226 Difference]: Without dead ends: 73 [2019-11-06 18:44:18,940 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:44:18,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2019-11-06 18:44:18,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 73. [2019-11-06 18:44:18,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-11-06 18:44:18,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2019-11-06 18:44:18,945 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 65 [2019-11-06 18:44:18,945 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:18,945 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2019-11-06 18:44:18,945 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:44:18,945 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2019-11-06 18:44:18,946 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2019-11-06 18:44:18,946 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:18,946 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:19,150 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:19,150 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:19,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:19,151 INFO L82 PathProgramCache]: Analyzing trace with hash -1332687359, now seen corresponding path program 17 times [2019-11-06 18:44:19,151 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:19,152 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030580857] [2019-11-06 18:44:19,152 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:19,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:19,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:19,466 INFO L134 CoverageAnalysis]: Checked inductivity of 459 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 306 trivial. 0 not checked. [2019-11-06 18:44:19,467 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030580857] [2019-11-06 18:44:19,467 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1385076426] [2019-11-06 18:44:19,467 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