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_copy2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:43:15,541 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:43:15,544 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:43:15,557 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:43:15,557 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:43:15,558 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:43:15,559 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:43:15,561 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:43:15,563 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:43:15,564 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:43:15,565 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:43:15,566 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:43:15,566 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:43:15,567 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:43:15,568 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:43:15,569 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:43:15,570 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:43:15,572 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:43:15,576 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:43:15,577 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:43:15,581 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:43:15,582 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:43:15,583 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:43:15,584 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:43:15,588 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:43:15,594 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:43:15,595 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:43:15,596 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:43:15,597 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:43:15,600 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:43:15,600 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:43:15,601 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:43:15,601 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:43:15,601 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:43:15,603 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:43:15,606 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:43:15,607 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:43:15,626 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:43:15,626 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:43:15,628 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:43:15,628 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:43:15,628 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:43:15,629 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:43:15,629 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:43:15,629 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:43:15,629 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:43:15,629 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:43:15,630 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:43:15,631 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:43:15,631 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:43:15,631 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:43:15,631 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:43:15,632 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:43:15,632 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:43:15,632 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:43:15,632 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:43:15,632 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:43:15,632 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:43:15,633 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:43:15,633 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:43:15,633 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:43:15,633 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:43:15,633 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:43:15,634 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:43:15,634 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:43:15,634 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:43:15,918 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:43:15,930 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:43:15,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:43:15,935 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:43:15,936 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:43:15,936 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-10-14 21:43:16,014 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca9f8e205/197825ecac0e4d329686f7151ee2fc0e/FLAGdc37355d5 [2019-10-14 21:43:16,499 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:43:16,500 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copy2_ground-2.i [2019-10-14 21:43:16,507 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca9f8e205/197825ecac0e4d329686f7151ee2fc0e/FLAGdc37355d5 [2019-10-14 21:43:16,858 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ca9f8e205/197825ecac0e4d329686f7151ee2fc0e [2019-10-14 21:43:16,869 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:43:16,870 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:43:16,871 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:43:16,871 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:43:16,875 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:43:16,876 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:43:16" (1/1) ... [2019-10-14 21:43:16,879 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1ef43f7e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:16, skipping insertion in model container [2019-10-14 21:43:16,879 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:43:16" (1/1) ... [2019-10-14 21:43:16,886 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:43:16,903 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:43:17,084 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:43:17,089 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:43:17,123 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:43:17,144 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:43:17,145 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17 WrapperNode [2019-10-14 21:43:17,145 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:43:17,146 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:43:17,146 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:43:17,146 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:43:17,248 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,257 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,258 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,281 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,287 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,288 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... [2019-10-14 21:43:17,290 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:43:17,291 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:43:17,291 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:43:17,291 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:43:17,292 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:43:17,340 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:43:17,340 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:43:17,340 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:43:17,340 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:43:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:43:17,340 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:43:17,341 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:43:17,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:43:17,342 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:43:17,600 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:43:17,601 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-14 21:43:17,602 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:43:17 BoogieIcfgContainer [2019-10-14 21:43:17,603 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:43:17,607 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:43:17,608 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:43:17,617 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:43:17,617 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:43:16" (1/3) ... [2019-10-14 21:43:17,618 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487f643d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:43:17, skipping insertion in model container [2019-10-14 21:43:17,618 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:43:17" (2/3) ... [2019-10-14 21:43:17,619 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@487f643d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:43:17, skipping insertion in model container [2019-10-14 21:43:17,619 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:43:17" (3/3) ... [2019-10-14 21:43:17,624 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copy2_ground-2.i [2019-10-14 21:43:17,635 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:43:17,644 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:43:17,679 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:43:17,708 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:43:17,708 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:43:17,708 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:43:17,709 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:43:17,709 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:43:17,709 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:43:17,709 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:43:17,709 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:43:17,725 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states. [2019-10-14 21:43:17,730 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:43:17,730 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:17,731 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:17,733 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:17,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:17,738 INFO L82 PathProgramCache]: Analyzing trace with hash 415311520, now seen corresponding path program 1 times [2019-10-14 21:43:17,746 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:17,746 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [805854612] [2019-10-14 21:43:17,747 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:17,747 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:17,747 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:17,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:17,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:17,891 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:43:17,892 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [805854612] [2019-10-14 21:43:17,893 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:43:17,893 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:43:17,893 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [797440258] [2019-10-14 21:43:17,898 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:43:17,898 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:17,912 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:43:17,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:43:17,918 INFO L87 Difference]: Start difference. First operand 30 states. Second operand 3 states. [2019-10-14 21:43:18,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:18,021 INFO L93 Difference]: Finished difference Result 52 states and 67 transitions. [2019-10-14 21:43:18,022 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:43:18,023 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 21:43:18,024 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:18,030 INFO L225 Difference]: With dead ends: 52 [2019-10-14 21:43:18,031 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:43:18,034 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:43:18,048 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:43:18,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2019-10-14 21:43:18,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2019-10-14 21:43:18,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2019-10-14 21:43:18,068 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 17 [2019-10-14 21:43:18,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:18,068 INFO L462 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2019-10-14 21:43:18,069 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:43:18,069 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2019-10-14 21:43:18,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:43:18,070 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:18,070 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:18,070 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:18,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:18,071 INFO L82 PathProgramCache]: Analyzing trace with hash -1687882214, now seen corresponding path program 1 times [2019-10-14 21:43:18,071 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:18,072 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [80322152] [2019-10-14 21:43:18,072 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,072 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,072 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:18,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,152 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:43:18,153 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [80322152] [2019-10-14 21:43:18,153 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:43:18,154 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:43:18,154 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [234688237] [2019-10-14 21:43:18,157 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:43:18,157 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:18,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:43:18,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:43:18,158 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 4 states. [2019-10-14 21:43:18,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:18,248 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2019-10-14 21:43:18,249 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:43:18,249 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-14 21:43:18,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:18,250 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:43:18,250 INFO L226 Difference]: Without dead ends: 27 [2019-10-14 21:43:18,252 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:43:18,253 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2019-10-14 21:43:18,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2019-10-14 21:43:18,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:43:18,264 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2019-10-14 21:43:18,264 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 17 [2019-10-14 21:43:18,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:18,265 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2019-10-14 21:43:18,265 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:43:18,265 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2019-10-14 21:43:18,267 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:43:18,268 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:18,268 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:18,268 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:18,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:18,270 INFO L82 PathProgramCache]: Analyzing trace with hash 1114616120, now seen corresponding path program 1 times [2019-10-14 21:43:18,270 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:18,271 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829539279] [2019-10-14 21:43:18,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,271 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,272 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:18,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,377 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-14 21:43:18,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829539279] [2019-10-14 21:43:18,377 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:43:18,378 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:43:18,378 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658681703] [2019-10-14 21:43:18,378 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:43:18,379 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:18,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:43:18,381 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:43:18,381 INFO L87 Difference]: Start difference. First operand 26 states and 29 transitions. Second operand 4 states. [2019-10-14 21:43:18,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:18,478 INFO L93 Difference]: Finished difference Result 44 states and 50 transitions. [2019-10-14 21:43:18,480 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:43:18,480 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-10-14 21:43:18,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:18,481 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:43:18,482 INFO L226 Difference]: Without dead ends: 30 [2019-10-14 21:43:18,483 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:43:18,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-10-14 21:43:18,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2019-10-14 21:43:18,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:43:18,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2019-10-14 21:43:18,493 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 19 [2019-10-14 21:43:18,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:18,493 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2019-10-14 21:43:18,494 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:43:18,494 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2019-10-14 21:43:18,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:43:18,494 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:18,495 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:18,495 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:18,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:18,496 INFO L82 PathProgramCache]: Analyzing trace with hash -825329612, now seen corresponding path program 1 times [2019-10-14 21:43:18,496 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:18,497 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750705319] [2019-10-14 21:43:18,498 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,498 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:18,498 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:18,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,636 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:43:18,638 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750705319] [2019-10-14 21:43:18,639 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2005980882] [2019-10-14 21:43:18,639 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:18,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:18,707 INFO L256 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:43:18,713 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:18,755 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:43:18,756 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:18,756 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 7 [2019-10-14 21:43:18,756 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1069733147] [2019-10-14 21:43:18,757 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:43:18,757 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:18,758 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:43:18,758 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:43:18,758 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand 7 states. [2019-10-14 21:43:18,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:18,888 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2019-10-14 21:43:18,888 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:43:18,888 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 23 [2019-10-14 21:43:18,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:18,889 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:43:18,890 INFO L226 Difference]: Without dead ends: 37 [2019-10-14 21:43:18,890 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:43:18,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-14 21:43:18,896 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2019-10-14 21:43:18,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-14 21:43:18,899 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 37 transitions. [2019-10-14 21:43:18,900 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 37 transitions. Word has length 23 [2019-10-14 21:43:18,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:18,900 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 37 transitions. [2019-10-14 21:43:18,900 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:43:18,900 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 37 transitions. [2019-10-14 21:43:18,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-10-14 21:43:18,902 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:18,902 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:19,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:19,107 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:19,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:19,108 INFO L82 PathProgramCache]: Analyzing trace with hash 1714175694, now seen corresponding path program 2 times [2019-10-14 21:43:19,108 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:19,108 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [382723864] [2019-10-14 21:43:19,108 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:19,108 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:19,109 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:19,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:19,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:19,207 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-14 21:43:19,208 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [382723864] [2019-10-14 21:43:19,208 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [24898883] [2019-10-14 21:43:19,208 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:19,253 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:19,253 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:19,254 INFO L256 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:43:19,256 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:19,291 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-14 21:43:19,291 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:19,292 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 9 [2019-10-14 21:43:19,292 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [713670287] [2019-10-14 21:43:19,293 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:43:19,293 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:19,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:43:19,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:43:19,294 INFO L87 Difference]: Start difference. First operand 34 states and 37 transitions. Second operand 9 states. [2019-10-14 21:43:19,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:19,442 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2019-10-14 21:43:19,443 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:43:19,443 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 29 [2019-10-14 21:43:19,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:19,444 INFO L225 Difference]: With dead ends: 66 [2019-10-14 21:43:19,444 INFO L226 Difference]: Without dead ends: 43 [2019-10-14 21:43:19,445 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:43:19,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2019-10-14 21:43:19,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2019-10-14 21:43:19,453 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:43:19,454 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 43 transitions. [2019-10-14 21:43:19,454 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 43 transitions. Word has length 29 [2019-10-14 21:43:19,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:19,454 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 43 transitions. [2019-10-14 21:43:19,454 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:43:19,455 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 43 transitions. [2019-10-14 21:43:19,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:43:19,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:19,456 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:19,656 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:19,657 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:19,657 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:19,657 INFO L82 PathProgramCache]: Analyzing trace with hash 561048040, now seen corresponding path program 3 times [2019-10-14 21:43:19,658 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:19,658 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633444339] [2019-10-14 21:43:19,658 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:19,658 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:19,658 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:19,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:19,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:19,737 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:43:19,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633444339] [2019-10-14 21:43:19,738 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [337230319] [2019-10-14 21:43:19,738 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:19,791 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:43:19,792 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:19,793 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:43:19,795 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:19,844 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:43:19,844 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:19,844 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 11 [2019-10-14 21:43:19,845 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [839768918] [2019-10-14 21:43:19,845 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:43:19,846 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:19,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:43:19,846 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:19,846 INFO L87 Difference]: Start difference. First operand 40 states and 43 transitions. Second operand 11 states. [2019-10-14 21:43:19,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:19,976 INFO L93 Difference]: Finished difference Result 76 states and 84 transitions. [2019-10-14 21:43:19,976 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:43:19,976 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 35 [2019-10-14 21:43:19,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:19,977 INFO L225 Difference]: With dead ends: 76 [2019-10-14 21:43:19,978 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:43:19,978 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:19,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:43:19,984 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2019-10-14 21:43:19,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-10-14 21:43:19,985 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 49 transitions. [2019-10-14 21:43:19,985 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 49 transitions. Word has length 35 [2019-10-14 21:43:19,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:19,986 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 49 transitions. [2019-10-14 21:43:19,986 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:43:19,986 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 49 transitions. [2019-10-14 21:43:19,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:43:19,987 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:19,987 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:20,191 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:20,192 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:20,192 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:20,192 INFO L82 PathProgramCache]: Analyzing trace with hash 2115443074, now seen corresponding path program 4 times [2019-10-14 21:43:20,193 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:20,193 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751760887] [2019-10-14 21:43:20,193 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:20,194 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:20,194 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:20,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:20,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:20,298 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-14 21:43:20,299 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751760887] [2019-10-14 21:43:20,299 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [996862973] [2019-10-14 21:43:20,299 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:20,351 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:20,351 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:20,352 INFO L256 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:43:20,354 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:20,425 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-14 21:43:20,426 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:20,426 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 13 [2019-10-14 21:43:20,426 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1431810241] [2019-10-14 21:43:20,427 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:43:20,427 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:20,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:43:20,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:43:20,428 INFO L87 Difference]: Start difference. First operand 46 states and 49 transitions. Second operand 13 states. [2019-10-14 21:43:20,609 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:20,609 INFO L93 Difference]: Finished difference Result 86 states and 94 transitions. [2019-10-14 21:43:20,609 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:43:20,609 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 41 [2019-10-14 21:43:20,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:20,610 INFO L225 Difference]: With dead ends: 86 [2019-10-14 21:43:20,611 INFO L226 Difference]: Without dead ends: 55 [2019-10-14 21:43:20,611 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:43:20,612 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2019-10-14 21:43:20,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2019-10-14 21:43:20,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:43:20,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 21:43:20,618 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 41 [2019-10-14 21:43:20,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:20,619 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 21:43:20,619 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:43:20,619 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 21:43:20,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:43:20,620 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:20,620 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:20,823 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:20,824 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:20,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:20,825 INFO L82 PathProgramCache]: Analyzing trace with hash -249467492, now seen corresponding path program 5 times [2019-10-14 21:43:20,825 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:20,825 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817285769] [2019-10-14 21:43:20,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:20,826 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:20,826 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:20,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:20,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:20,936 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 21:43:20,936 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817285769] [2019-10-14 21:43:20,936 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288280988] [2019-10-14 21:43:20,936 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:21,482 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:43:21,482 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:21,485 INFO L256 TraceCheckSpWp]: Trace formula consists of 142 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:43:21,487 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:21,502 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 21:43:21,503 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:21,503 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:43:21,503 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573175771] [2019-10-14 21:43:21,504 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:43:21,504 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:21,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:43:21,504 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:43:21,505 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 10 states. [2019-10-14 21:43:21,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:21,634 INFO L93 Difference]: Finished difference Result 81 states and 87 transitions. [2019-10-14 21:43:21,637 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:43:21,637 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 47 [2019-10-14 21:43:21,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:21,638 INFO L225 Difference]: With dead ends: 81 [2019-10-14 21:43:21,638 INFO L226 Difference]: Without dead ends: 58 [2019-10-14 21:43:21,639 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:43:21,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-14 21:43:21,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 56. [2019-10-14 21:43:21,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:43:21,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 59 transitions. [2019-10-14 21:43:21,645 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 59 transitions. Word has length 47 [2019-10-14 21:43:21,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:21,645 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 59 transitions. [2019-10-14 21:43:21,645 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:43:21,645 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 59 transitions. [2019-10-14 21:43:21,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:43:21,646 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:21,647 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:21,858 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:21,859 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:21,860 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:21,860 INFO L82 PathProgramCache]: Analyzing trace with hash -619179368, now seen corresponding path program 6 times [2019-10-14 21:43:21,860 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:21,861 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [951495456] [2019-10-14 21:43:21,861 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:21,862 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:21,862 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:21,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:21,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:21,963 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2019-10-14 21:43:21,963 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [951495456] [2019-10-14 21:43:21,964 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [792547807] [2019-10-14 21:43:21,964 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:22,145 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:43:22,146 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:22,147 INFO L256 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:43:22,151 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:22,169 INFO L134 CoverageAnalysis]: Checked inductivity of 97 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 61 trivial. 0 not checked. [2019-10-14 21:43:22,169 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:22,169 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:43:22,170 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1082659207] [2019-10-14 21:43:22,170 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:43:22,170 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:22,170 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:43:22,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:22,171 INFO L87 Difference]: Start difference. First operand 56 states and 59 transitions. Second operand 11 states. [2019-10-14 21:43:22,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:22,322 INFO L93 Difference]: Finished difference Result 87 states and 93 transitions. [2019-10-14 21:43:22,323 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:43:22,323 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 51 [2019-10-14 21:43:22,323 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:22,324 INFO L225 Difference]: With dead ends: 87 [2019-10-14 21:43:22,324 INFO L226 Difference]: Without dead ends: 62 [2019-10-14 21:43:22,324 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:22,325 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-10-14 21:43:22,330 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 60. [2019-10-14 21:43:22,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-10-14 21:43:22,331 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 63 transitions. [2019-10-14 21:43:22,331 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 63 transitions. Word has length 51 [2019-10-14 21:43:22,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:22,332 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 63 transitions. [2019-10-14 21:43:22,332 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:43:22,332 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 63 transitions. [2019-10-14 21:43:22,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:43:22,333 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:22,333 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:22,537 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:22,538 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:22,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:22,538 INFO L82 PathProgramCache]: Analyzing trace with hash 2123942292, now seen corresponding path program 7 times [2019-10-14 21:43:22,539 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:22,541 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [260710412] [2019-10-14 21:43:22,541 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:22,541 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:22,541 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:22,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:22,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:22,684 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2019-10-14 21:43:22,684 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [260710412] [2019-10-14 21:43:22,685 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118242773] [2019-10-14 21:43:22,685 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:22,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:22,742 INFO L256 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:43:22,744 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:22,835 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-14 21:43:22,836 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:22,836 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 17 [2019-10-14 21:43:22,836 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [804916612] [2019-10-14 21:43:22,837 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:43:22,837 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:22,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:43:22,838 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:43:22,839 INFO L87 Difference]: Start difference. First operand 60 states and 63 transitions. Second operand 17 states. [2019-10-14 21:43:23,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:23,029 INFO L93 Difference]: Finished difference Result 112 states and 120 transitions. [2019-10-14 21:43:23,030 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:43:23,030 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 55 [2019-10-14 21:43:23,030 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:23,031 INFO L225 Difference]: With dead ends: 112 [2019-10-14 21:43:23,031 INFO L226 Difference]: Without dead ends: 69 [2019-10-14 21:43:23,032 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:43:23,032 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-14 21:43:23,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2019-10-14 21:43:23,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-10-14 21:43:23,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 69 transitions. [2019-10-14 21:43:23,039 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 69 transitions. Word has length 55 [2019-10-14 21:43:23,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:23,039 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 69 transitions. [2019-10-14 21:43:23,039 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:43:23,039 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 69 transitions. [2019-10-14 21:43:23,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:43:23,040 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:23,041 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:23,244 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:23,244 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:23,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:23,245 INFO L82 PathProgramCache]: Analyzing trace with hash 1961527342, now seen corresponding path program 8 times [2019-10-14 21:43:23,245 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:23,246 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1607571059] [2019-10-14 21:43:23,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:23,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:23,247 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:23,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:23,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:23,376 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-14 21:43:23,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1607571059] [2019-10-14 21:43:23,377 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743357868] [2019-10-14 21:43:23,377 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:23,441 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:23,441 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:23,442 INFO L256 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:43:23,454 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:23,489 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-14 21:43:23,490 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:23,490 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:43:23,490 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72204541] [2019-10-14 21:43:23,491 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:43:23,491 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:23,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:43:23,491 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:23,491 INFO L87 Difference]: Start difference. First operand 66 states and 69 transitions. Second operand 11 states. [2019-10-14 21:43:23,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:23,574 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2019-10-14 21:43:23,574 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:43:23,575 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 61 [2019-10-14 21:43:23,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:23,576 INFO L225 Difference]: With dead ends: 116 [2019-10-14 21:43:23,576 INFO L226 Difference]: Without dead ends: 69 [2019-10-14 21:43:23,577 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:43:23,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-14 21:43:23,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 68. [2019-10-14 21:43:23,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2019-10-14 21:43:23,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 71 transitions. [2019-10-14 21:43:23,583 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 71 transitions. Word has length 61 [2019-10-14 21:43:23,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:23,584 INFO L462 AbstractCegarLoop]: Abstraction has 68 states and 71 transitions. [2019-10-14 21:43:23,584 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:43:23,584 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 71 transitions. [2019-10-14 21:43:23,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:43:23,585 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:23,585 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:23,795 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:23,796 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:23,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:23,797 INFO L82 PathProgramCache]: Analyzing trace with hash -1042313652, now seen corresponding path program 9 times [2019-10-14 21:43:23,797 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:23,798 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1789342758] [2019-10-14 21:43:23,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:23,798 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:23,798 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:23,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:23,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:23,949 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 113 trivial. 0 not checked. [2019-10-14 21:43:23,949 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1789342758] [2019-10-14 21:43:23,949 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1139260490] [2019-10-14 21:43:23,949 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:24,564 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2019-10-14 21:43:24,564 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:24,566 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:43:24,569 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:24,666 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-14 21:43:24,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:24,667 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 10] total 20 [2019-10-14 21:43:24,667 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [670349209] [2019-10-14 21:43:24,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:43:24,668 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:24,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:43:24,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:24,668 INFO L87 Difference]: Start difference. First operand 68 states and 71 transitions. Second operand 20 states. [2019-10-14 21:43:24,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:24,883 INFO L93 Difference]: Finished difference Result 124 states and 132 transitions. [2019-10-14 21:43:24,883 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:43:24,884 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 63 [2019-10-14 21:43:24,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:24,884 INFO L225 Difference]: With dead ends: 124 [2019-10-14 21:43:24,885 INFO L226 Difference]: Without dead ends: 77 [2019-10-14 21:43:24,885 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:24,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-14 21:43:24,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2019-10-14 21:43:24,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2019-10-14 21:43:24,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 77 transitions. [2019-10-14 21:43:24,892 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 77 transitions. Word has length 63 [2019-10-14 21:43:24,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:24,892 INFO L462 AbstractCegarLoop]: Abstraction has 74 states and 77 transitions. [2019-10-14 21:43:24,892 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:43:24,893 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 77 transitions. [2019-10-14 21:43:24,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-14 21:43:24,894 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:24,894 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:25,107 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:25,108 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:25,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:25,108 INFO L82 PathProgramCache]: Analyzing trace with hash -965958938, now seen corresponding path program 10 times [2019-10-14 21:43:25,109 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:25,109 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115983057] [2019-10-14 21:43:25,110 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:25,110 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:25,110 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:25,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:25,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:25,235 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:25,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115983057] [2019-10-14 21:43:25,236 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1376183344] [2019-10-14 21:43:25,236 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:25,299 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:25,299 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:25,300 INFO L256 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:43:25,302 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:25,325 INFO L134 CoverageAnalysis]: Checked inductivity of 226 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:25,325 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:25,325 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:43:25,325 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749018708] [2019-10-14 21:43:25,326 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:43:25,326 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:25,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:43:25,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:43:25,327 INFO L87 Difference]: Start difference. First operand 74 states and 77 transitions. Second operand 13 states. [2019-10-14 21:43:25,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:25,413 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2019-10-14 21:43:25,413 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:43:25,414 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 69 [2019-10-14 21:43:25,414 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:25,414 INFO L225 Difference]: With dead ends: 128 [2019-10-14 21:43:25,415 INFO L226 Difference]: Without dead ends: 77 [2019-10-14 21:43:25,418 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:43:25,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2019-10-14 21:43:25,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 76. [2019-10-14 21:43:25,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:43:25,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 79 transitions. [2019-10-14 21:43:25,430 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 79 transitions. Word has length 69 [2019-10-14 21:43:25,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:25,430 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 79 transitions. [2019-10-14 21:43:25,430 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:43:25,430 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 79 transitions. [2019-10-14 21:43:25,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2019-10-14 21:43:25,432 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:25,432 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:25,632 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:25,633 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:25,634 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:25,634 INFO L82 PathProgramCache]: Analyzing trace with hash 1224780548, now seen corresponding path program 11 times [2019-10-14 21:43:25,634 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:25,635 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [228108944] [2019-10-14 21:43:25,635 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:25,636 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:25,636 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:25,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:25,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:25,776 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:25,776 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [228108944] [2019-10-14 21:43:25,777 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791721726] [2019-10-14 21:43:25,777 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:36,416 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-10-14 21:43:36,417 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:36,426 INFO L256 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:43:36,428 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:36,448 INFO L134 CoverageAnalysis]: Checked inductivity of 243 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:36,448 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:36,448 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:43:36,448 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1529855684] [2019-10-14 21:43:36,452 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:43:36,452 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:36,452 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:43:36,452 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:43:36,453 INFO L87 Difference]: Start difference. First operand 76 states and 79 transitions. Second operand 14 states. [2019-10-14 21:43:36,555 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:36,555 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2019-10-14 21:43:36,556 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:43:36,556 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 71 [2019-10-14 21:43:36,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:36,557 INFO L225 Difference]: With dead ends: 130 [2019-10-14 21:43:36,557 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 21:43:36,557 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 72 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:43:36,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 21:43:36,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2019-10-14 21:43:36,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2019-10-14 21:43:36,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 81 transitions. [2019-10-14 21:43:36,564 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 81 transitions. Word has length 71 [2019-10-14 21:43:36,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:36,564 INFO L462 AbstractCegarLoop]: Abstraction has 78 states and 81 transitions. [2019-10-14 21:43:36,564 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:43:36,564 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 81 transitions. [2019-10-14 21:43:36,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-14 21:43:36,565 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:36,565 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:36,772 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:36,773 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:36,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:36,774 INFO L82 PathProgramCache]: Analyzing trace with hash 1991451554, now seen corresponding path program 12 times [2019-10-14 21:43:36,774 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:36,774 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1748145826] [2019-10-14 21:43:36,774 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:36,775 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:36,775 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:36,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:36,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:36,944 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:36,944 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1748145826] [2019-10-14 21:43:36,944 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1149380262] [2019-10-14 21:43:36,944 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:39,446 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 11 check-sat command(s) [2019-10-14 21:43:39,446 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:39,451 INFO L256 TraceCheckSpWp]: Trace formula consists of 204 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:43:39,453 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:39,474 INFO L134 CoverageAnalysis]: Checked inductivity of 262 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:39,474 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:39,475 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:43:39,475 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317332733] [2019-10-14 21:43:39,475 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:43:39,476 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:39,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:43:39,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:43:39,476 INFO L87 Difference]: Start difference. First operand 78 states and 81 transitions. Second operand 15 states. [2019-10-14 21:43:39,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:39,574 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2019-10-14 21:43:39,575 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:43:39,575 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 73 [2019-10-14 21:43:39,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:39,576 INFO L225 Difference]: With dead ends: 132 [2019-10-14 21:43:39,576 INFO L226 Difference]: Without dead ends: 81 [2019-10-14 21:43:39,577 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:43:39,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-10-14 21:43:39,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2019-10-14 21:43:39,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-14 21:43:39,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 83 transitions. [2019-10-14 21:43:39,582 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 83 transitions. Word has length 73 [2019-10-14 21:43:39,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:39,583 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 83 transitions. [2019-10-14 21:43:39,583 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:43:39,583 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 83 transitions. [2019-10-14 21:43:39,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2019-10-14 21:43:39,584 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:39,584 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:39,790 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:39,791 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:39,791 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:39,791 INFO L82 PathProgramCache]: Analyzing trace with hash 27913408, now seen corresponding path program 13 times [2019-10-14 21:43:39,791 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:39,791 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131174658] [2019-10-14 21:43:39,792 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:39,792 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:39,792 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:39,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:39,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:39,961 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 202 trivial. 0 not checked. [2019-10-14 21:43:39,962 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131174658] [2019-10-14 21:43:39,962 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1884826235] [2019-10-14 21:43:39,962 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:40,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:40,032 INFO L256 TraceCheckSpWp]: Trace formula consists of 210 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:43:40,034 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:40,238 INFO L134 CoverageAnalysis]: Checked inductivity of 283 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:43:40,239 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:40,239 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14] total 25 [2019-10-14 21:43:40,239 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863024114] [2019-10-14 21:43:40,240 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-14 21:43:40,240 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:40,243 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-14 21:43:40,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:43:40,245 INFO L87 Difference]: Start difference. First operand 80 states and 83 transitions. Second operand 25 states. [2019-10-14 21:43:40,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:40,491 INFO L93 Difference]: Finished difference Result 140 states and 148 transitions. [2019-10-14 21:43:40,491 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:43:40,491 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 75 [2019-10-14 21:43:40,491 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:40,492 INFO L225 Difference]: With dead ends: 140 [2019-10-14 21:43:40,492 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 21:43:40,493 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 65 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2019-10-14 21:43:40,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 21:43:40,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2019-10-14 21:43:40,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-10-14 21:43:40,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 89 transitions. [2019-10-14 21:43:40,501 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 89 transitions. Word has length 75 [2019-10-14 21:43:40,502 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:40,502 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 89 transitions. [2019-10-14 21:43:40,502 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-14 21:43:40,502 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 89 transitions. [2019-10-14 21:43:40,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2019-10-14 21:43:40,503 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:40,503 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:40,712 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:40,712 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:40,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:40,713 INFO L82 PathProgramCache]: Analyzing trace with hash -557376934, now seen corresponding path program 14 times [2019-10-14 21:43:40,713 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:40,713 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1706321934] [2019-10-14 21:43:40,713 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:40,713 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:40,713 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:40,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:40,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:40,864 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-14 21:43:40,864 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1706321934] [2019-10-14 21:43:40,865 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [581518335] [2019-10-14 21:43:40,865 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:40,922 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:43:40,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:40,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 224 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:43:40,925 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:40,943 INFO L134 CoverageAnalysis]: Checked inductivity of 344 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-14 21:43:40,944 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:40,944 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:43:40,944 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612381661] [2019-10-14 21:43:40,945 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:43:40,945 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:40,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:43:40,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:43:40,946 INFO L87 Difference]: Start difference. First operand 86 states and 89 transitions. Second operand 17 states. [2019-10-14 21:43:41,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:41,076 INFO L93 Difference]: Finished difference Result 144 states and 150 transitions. [2019-10-14 21:43:41,090 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:43:41,090 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 81 [2019-10-14 21:43:41,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:41,091 INFO L225 Difference]: With dead ends: 144 [2019-10-14 21:43:41,091 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 21:43:41,092 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 82 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:43:41,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 21:43:41,098 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-10-14 21:43:41,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 21:43:41,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 91 transitions. [2019-10-14 21:43:41,099 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 91 transitions. Word has length 81 [2019-10-14 21:43:41,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:41,101 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 91 transitions. [2019-10-14 21:43:41,101 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:43:41,101 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 91 transitions. [2019-10-14 21:43:41,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 21:43:41,102 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:41,102 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:41,308 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:41,309 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:41,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:41,309 INFO L82 PathProgramCache]: Analyzing trace with hash 787080568, now seen corresponding path program 15 times [2019-10-14 21:43:41,309 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:41,310 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377849847] [2019-10-14 21:43:41,310 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:41,310 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:41,310 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:41,331 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:41,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:41,503 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-14 21:43:41,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377849847] [2019-10-14 21:43:41,503 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [495484860] [2019-10-14 21:43:41,503 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:44,818 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2019-10-14 21:43:44,818 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:44,823 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-14 21:43:44,825 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:45,056 INFO L134 CoverageAnalysis]: Checked inductivity of 369 backedges. 44 proven. 100 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-14 21:43:45,057 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:45,057 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 32 [2019-10-14 21:43:45,057 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552714746] [2019-10-14 21:43:45,058 INFO L442 AbstractCegarLoop]: Interpolant automaton has 32 states [2019-10-14 21:43:45,058 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:45,058 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2019-10-14 21:43:45,059 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=733, Unknown=0, NotChecked=0, Total=992 [2019-10-14 21:43:45,059 INFO L87 Difference]: Start difference. First operand 88 states and 91 transitions. Second operand 32 states. [2019-10-14 21:43:45,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:45,569 INFO L93 Difference]: Finished difference Result 155 states and 166 transitions. [2019-10-14 21:43:45,569 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-14 21:43:45,569 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 83 [2019-10-14 21:43:45,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:45,570 INFO L225 Difference]: With dead ends: 155 [2019-10-14 21:43:45,570 INFO L226 Difference]: Without dead ends: 100 [2019-10-14 21:43:45,571 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=467, Invalid=1513, Unknown=0, NotChecked=0, Total=1980 [2019-10-14 21:43:45,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2019-10-14 21:43:45,574 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 100. [2019-10-14 21:43:45,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 100 states. [2019-10-14 21:43:45,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 103 transitions. [2019-10-14 21:43:45,575 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 103 transitions. Word has length 83 [2019-10-14 21:43:45,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:45,575 INFO L462 AbstractCegarLoop]: Abstraction has 100 states and 103 transitions. [2019-10-14 21:43:45,575 INFO L463 AbstractCegarLoop]: Interpolant automaton has 32 states. [2019-10-14 21:43:45,576 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 103 transitions. [2019-10-14 21:43:45,576 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-14 21:43:45,576 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:45,576 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:45,777 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:45,777 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:45,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:45,778 INFO L82 PathProgramCache]: Analyzing trace with hash 986321196, now seen corresponding path program 16 times [2019-10-14 21:43:45,778 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:45,778 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977086417] [2019-10-14 21:43:45,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:45,778 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:45,778 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:45,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:45,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:45,951 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:45,952 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977086417] [2019-10-14 21:43:45,952 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [719373372] [2019-10-14 21:43:45,952 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:46,021 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:43:46,022 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:43:46,023 INFO L256 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:43:46,025 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:43:46,056 INFO L134 CoverageAnalysis]: Checked inductivity of 513 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:46,056 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:43:46,056 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:43:46,057 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254319504] [2019-10-14 21:43:46,057 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:43:46,057 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:43:46,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:43:46,058 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:46,058 INFO L87 Difference]: Start difference. First operand 100 states and 103 transitions. Second operand 20 states. [2019-10-14 21:43:46,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:43:46,193 INFO L93 Difference]: Finished difference Result 166 states and 172 transitions. [2019-10-14 21:43:46,193 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:43:46,194 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 95 [2019-10-14 21:43:46,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:43:46,194 INFO L225 Difference]: With dead ends: 166 [2019-10-14 21:43:46,194 INFO L226 Difference]: Without dead ends: 103 [2019-10-14 21:43:46,195 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:43:46,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2019-10-14 21:43:46,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 102. [2019-10-14 21:43:46,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-10-14 21:43:46,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 105 transitions. [2019-10-14 21:43:46,201 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 105 transitions. Word has length 95 [2019-10-14 21:43:46,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:43:46,201 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 105 transitions. [2019-10-14 21:43:46,201 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:43:46,201 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 105 transitions. [2019-10-14 21:43:46,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-14 21:43:46,202 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:43:46,202 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:43:46,406 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:43:46,407 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:43:46,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:43:46,407 INFO L82 PathProgramCache]: Analyzing trace with hash 744755146, now seen corresponding path program 17 times [2019-10-14 21:43:46,407 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:43:46,408 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1265005598] [2019-10-14 21:43:46,408 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:46,408 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:43:46,408 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:43:46,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:46,610 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:43:46,621 INFO L134 CoverageAnalysis]: Checked inductivity of 544 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:43:46,621 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1265005598] [2019-10-14 21:43:46,622 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961828218] [2019-10-14 21:43:46,622 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