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/sorting_bubblesort_2_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-f4eb214f-m [2019-10-13 17:43:33,504 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-13 17:43:33,506 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-13 17:43:33,523 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-13 17:43:33,524 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-13 17:43:33,525 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-13 17:43:33,526 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-13 17:43:33,528 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-13 17:43:33,532 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-13 17:43:33,533 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-13 17:43:33,534 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-13 17:43:33,536 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-13 17:43:33,536 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-13 17:43:33,537 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-13 17:43:33,538 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-13 17:43:33,539 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-13 17:43:33,540 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-13 17:43:33,541 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-13 17:43:33,543 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-13 17:43:33,545 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-13 17:43:33,547 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-13 17:43:33,548 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-13 17:43:33,549 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-13 17:43:33,550 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-13 17:43:33,552 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-13 17:43:33,555 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-13 17:43:33,558 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-13 17:43:33,559 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-13 17:43:33,560 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-13 17:43:33,561 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-13 17:43:33,561 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-13 17:43:33,565 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-13 17:43:33,565 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-13 17:43:33,566 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-13 17:43:33,566 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-13 17:43:33,567 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-13 17:43:33,568 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-13 17:43:33,593 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-13 17:43:33,593 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-13 17:43:33,595 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-13 17:43:33,595 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-13 17:43:33,595 INFO L138 SettingsManager]: * Use SBE=true [2019-10-13 17:43:33,595 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-13 17:43:33,595 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-13 17:43:33,596 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-13 17:43:33,596 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-13 17:43:33,596 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-13 17:43:33,597 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-13 17:43:33,597 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-13 17:43:33,598 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-13 17:43:33,598 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-13 17:43:33,598 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-13 17:43:33,599 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-13 17:43:33,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-13 17:43:33,599 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-13 17:43:33,599 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-13 17:43:33,599 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-13 17:43:33,600 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-13 17:43:33,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:43:33,600 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-13 17:43:33,601 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-13 17:43:33,601 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-13 17:43:33,601 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-13 17:43:33,601 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-13 17:43:33,601 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-13 17:43:33,602 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-13 17:43:33,910 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-13 17:43:33,931 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-13 17:43:33,934 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-13 17:43:33,936 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-13 17:43:33,936 INFO L275 PluginConnector]: CDTParser initialized [2019-10-13 17:43:33,937 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-10-13 17:43:34,017 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2073e7100/42a2b985a3084d5a864d877505a9dc31/FLAG5e2299d88 [2019-10-13 17:43:34,475 INFO L306 CDTParser]: Found 1 translation units. [2019-10-13 17:43:34,477 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/sorting_bubblesort_2_ground.i [2019-10-13 17:43:34,484 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2073e7100/42a2b985a3084d5a864d877505a9dc31/FLAG5e2299d88 [2019-10-13 17:43:34,886 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/2073e7100/42a2b985a3084d5a864d877505a9dc31 [2019-10-13 17:43:34,896 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-13 17:43:34,898 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-13 17:43:34,899 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:34,899 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-13 17:43:34,902 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-13 17:43:34,904 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:34" (1/1) ... [2019-10-13 17:43:34,906 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@70c599cf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:34, skipping insertion in model container [2019-10-13 17:43:34,907 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 13.10 05:43:34" (1/1) ... [2019-10-13 17:43:34,914 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-13 17:43:34,929 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-13 17:43:35,094 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:35,097 INFO L188 MainTranslator]: Completed pre-run [2019-10-13 17:43:35,119 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-13 17:43:35,138 INFO L192 MainTranslator]: Completed translation [2019-10-13 17:43:35,139 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35 WrapperNode [2019-10-13 17:43:35,139 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-13 17:43:35,139 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-13 17:43:35,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-13 17:43:35,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-13 17:43:35,231 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,231 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,240 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,240 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,257 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,259 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... [2019-10-13 17:43:35,261 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-13 17:43:35,262 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-13 17:43:35,262 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-13 17:43:35,262 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-13 17:43:35,267 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-13 17:43:35,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-13 17:43:35,319 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-13 17:43:35,319 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-13 17:43:35,319 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-13 17:43:35,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-13 17:43:35,319 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-13 17:43:35,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-13 17:43:35,321 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-13 17:43:35,645 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-13 17:43:35,645 INFO L284 CfgBuilder]: Removed 5 assume(true) statements. [2019-10-13 17:43:35,646 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:35 BoogieIcfgContainer [2019-10-13 17:43:35,646 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-13 17:43:35,648 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-13 17:43:35,648 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-13 17:43:35,650 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-13 17:43:35,651 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 13.10 05:43:34" (1/3) ... [2019-10-13 17:43:35,651 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d95d02b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:35, skipping insertion in model container [2019-10-13 17:43:35,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 13.10 05:43:35" (2/3) ... [2019-10-13 17:43:35,652 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@4d95d02b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 13.10 05:43:35, skipping insertion in model container [2019-10-13 17:43:35,652 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 13.10 05:43:35" (3/3) ... [2019-10-13 17:43:35,654 INFO L109 eAbstractionObserver]: Analyzing ICFG sorting_bubblesort_2_ground.i [2019-10-13 17:43:35,663 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-13 17:43:35,671 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-13 17:43:35,680 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-13 17:43:35,703 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-13 17:43:35,704 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-13 17:43:35,704 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-13 17:43:35,704 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-13 17:43:35,704 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-13 17:43:35,704 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-13 17:43:35,704 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-13 17:43:35,704 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-13 17:43:35,723 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2019-10-13 17:43:35,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:43:35,729 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:35,730 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:35,731 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:35,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:35,737 INFO L82 PathProgramCache]: Analyzing trace with hash -1296691801, now seen corresponding path program 1 times [2019-10-13 17:43:35,744 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:35,744 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2002252435] [2019-10-13 17:43:35,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:35,745 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:35,745 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:35,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:35,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:35,895 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:35,896 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2002252435] [2019-10-13 17:43:35,897 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:35,897 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-13 17:43:35,897 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379906228] [2019-10-13 17:43:35,902 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-13 17:43:35,903 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:35,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-13 17:43:35,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:35,920 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 3 states. [2019-10-13 17:43:36,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:36,068 INFO L93 Difference]: Finished difference Result 54 states and 75 transitions. [2019-10-13 17:43:36,069 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-13 17:43:36,071 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 16 [2019-10-13 17:43:36,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:36,088 INFO L225 Difference]: With dead ends: 54 [2019-10-13 17:43:36,088 INFO L226 Difference]: Without dead ends: 26 [2019-10-13 17:43:36,094 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-13 17:43:36,116 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-13 17:43:36,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-13 17:43:36,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-13 17:43:36,151 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 31 transitions. [2019-10-13 17:43:36,153 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 31 transitions. Word has length 16 [2019-10-13 17:43:36,154 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:36,154 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 31 transitions. [2019-10-13 17:43:36,155 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-13 17:43:36,155 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 31 transitions. [2019-10-13 17:43:36,157 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2019-10-13 17:43:36,157 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:36,157 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:36,158 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:36,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:36,159 INFO L82 PathProgramCache]: Analyzing trace with hash -1547542812, now seen corresponding path program 1 times [2019-10-13 17:43:36,160 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:36,160 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084324153] [2019-10-13 17:43:36,160 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,161 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,161 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:36,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,266 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-13 17:43:36,267 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084324153] [2019-10-13 17:43:36,267 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:36,268 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:36,268 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698403965] [2019-10-13 17:43:36,270 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:36,270 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:36,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:36,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,271 INFO L87 Difference]: Start difference. First operand 26 states and 31 transitions. Second operand 4 states. [2019-10-13 17:43:36,363 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:36,363 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2019-10-13 17:43:36,364 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:36,364 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2019-10-13 17:43:36,364 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:36,365 INFO L225 Difference]: With dead ends: 46 [2019-10-13 17:43:36,366 INFO L226 Difference]: Without dead ends: 28 [2019-10-13 17:43:36,367 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-10-13 17:43:36,373 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2019-10-13 17:43:36,373 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-13 17:43:36,374 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 32 transitions. [2019-10-13 17:43:36,375 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 32 transitions. Word has length 16 [2019-10-13 17:43:36,375 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:36,375 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 32 transitions. [2019-10-13 17:43:36,375 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:36,376 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 32 transitions. [2019-10-13 17:43:36,376 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2019-10-13 17:43:36,377 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:36,377 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:36,377 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:36,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:36,378 INFO L82 PathProgramCache]: Analyzing trace with hash -1387426810, now seen corresponding path program 1 times [2019-10-13 17:43:36,378 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:36,378 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [808868548] [2019-10-13 17:43:36,379 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,379 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,379 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:36,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,453 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:36,454 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [808868548] [2019-10-13 17:43:36,454 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:36,454 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:36,454 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092455835] [2019-10-13 17:43:36,455 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:36,455 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:36,455 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:36,456 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,456 INFO L87 Difference]: Start difference. First operand 27 states and 32 transitions. Second operand 4 states. [2019-10-13 17:43:36,537 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:36,538 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2019-10-13 17:43:36,539 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:36,539 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2019-10-13 17:43:36,540 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:36,540 INFO L225 Difference]: With dead ends: 44 [2019-10-13 17:43:36,540 INFO L226 Difference]: Without dead ends: 31 [2019-10-13 17:43:36,541 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,542 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-13 17:43:36,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2019-10-13 17:43:36,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2019-10-13 17:43:36,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 38 transitions. [2019-10-13 17:43:36,548 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 38 transitions. Word has length 18 [2019-10-13 17:43:36,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:36,549 INFO L462 AbstractCegarLoop]: Abstraction has 31 states and 38 transitions. [2019-10-13 17:43:36,549 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:36,549 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 38 transitions. [2019-10-13 17:43:36,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2019-10-13 17:43:36,550 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:36,550 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] [2019-10-13 17:43:36,551 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:36,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:36,551 INFO L82 PathProgramCache]: Analyzing trace with hash 1108929549, now seen corresponding path program 1 times [2019-10-13 17:43:36,552 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:36,552 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2041700128] [2019-10-13 17:43:36,552 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,552 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,552 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:36,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,626 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-10-13 17:43:36,626 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2041700128] [2019-10-13 17:43:36,627 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-13 17:43:36,627 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-13 17:43:36,627 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469985021] [2019-10-13 17:43:36,628 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-13 17:43:36,628 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:36,628 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-13 17:43:36,629 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,629 INFO L87 Difference]: Start difference. First operand 31 states and 38 transitions. Second operand 4 states. [2019-10-13 17:43:36,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:36,714 INFO L93 Difference]: Finished difference Result 56 states and 71 transitions. [2019-10-13 17:43:36,714 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-13 17:43:36,714 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2019-10-13 17:43:36,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:36,716 INFO L225 Difference]: With dead ends: 56 [2019-10-13 17:43:36,716 INFO L226 Difference]: Without dead ends: 35 [2019-10-13 17:43:36,717 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-13 17:43:36,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-13 17:43:36,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2019-10-13 17:43:36,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-13 17:43:36,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2019-10-13 17:43:36,724 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 20 [2019-10-13 17:43:36,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:36,724 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2019-10-13 17:43:36,724 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-13 17:43:36,725 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2019-10-13 17:43:36,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-13 17:43:36,726 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:36,726 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] [2019-10-13 17:43:36,726 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:36,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:36,727 INFO L82 PathProgramCache]: Analyzing trace with hash -2055572838, now seen corresponding path program 1 times [2019-10-13 17:43:36,727 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:36,727 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643671093] [2019-10-13 17:43:36,728 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,728 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:36,728 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:36,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,819 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:43:36,819 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1643671093] [2019-10-13 17:43:36,820 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [358670681] [2019-10-13 17:43:36,820 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:36,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:36,887 INFO L256 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:36,895 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:36,933 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:43:36,934 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:36,934 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-13 17:43:36,934 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1168217780] [2019-10-13 17:43:36,936 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-13 17:43:36,936 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:36,937 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-13 17:43:36,937 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:36,938 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2019-10-13 17:43:37,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:37,028 INFO L93 Difference]: Finished difference Result 58 states and 72 transitions. [2019-10-13 17:43:37,028 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-13 17:43:37,028 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 23 [2019-10-13 17:43:37,029 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:37,029 INFO L225 Difference]: With dead ends: 58 [2019-10-13 17:43:37,030 INFO L226 Difference]: Without dead ends: 35 [2019-10-13 17:43:37,030 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-13 17:43:37,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2019-10-13 17:43:37,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 34. [2019-10-13 17:43:37,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-10-13 17:43:37,036 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2019-10-13 17:43:37,036 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 23 [2019-10-13 17:43:37,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:37,037 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2019-10-13 17:43:37,037 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-13 17:43:37,037 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2019-10-13 17:43:37,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-13 17:43:37,038 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:37,038 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:37,243 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:37,243 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:37,244 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:37,244 INFO L82 PathProgramCache]: Analyzing trace with hash 442145592, now seen corresponding path program 2 times [2019-10-13 17:43:37,245 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:37,245 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947539473] [2019-10-13 17:43:37,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:37,246 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:37,246 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:37,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:37,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:37,364 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:43:37,364 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947539473] [2019-10-13 17:43:37,364 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1528401244] [2019-10-13 17:43:37,365 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:37,434 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:37,435 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:37,437 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:43:37,439 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:37,473 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:43:37,474 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:37,474 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-13 17:43:37,474 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229717806] [2019-10-13 17:43:37,475 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-13 17:43:37,475 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:37,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-13 17:43:37,476 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:37,476 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 7 states. [2019-10-13 17:43:37,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:37,552 INFO L93 Difference]: Finished difference Result 60 states and 74 transitions. [2019-10-13 17:43:37,552 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-13 17:43:37,552 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 25 [2019-10-13 17:43:37,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:37,553 INFO L225 Difference]: With dead ends: 60 [2019-10-13 17:43:37,553 INFO L226 Difference]: Without dead ends: 37 [2019-10-13 17:43:37,554 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-13 17:43:37,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2019-10-13 17:43:37,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 36. [2019-10-13 17:43:37,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-10-13 17:43:37,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2019-10-13 17:43:37,560 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 25 [2019-10-13 17:43:37,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:37,560 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2019-10-13 17:43:37,560 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-13 17:43:37,560 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2019-10-13 17:43:37,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-13 17:43:37,561 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:37,561 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:37,765 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:37,766 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:37,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:37,766 INFO L82 PathProgramCache]: Analyzing trace with hash -137161642, now seen corresponding path program 3 times [2019-10-13 17:43:37,767 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:37,767 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1849999690] [2019-10-13 17:43:37,768 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:37,768 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:37,768 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:37,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:37,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:37,871 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-13 17:43:37,872 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1849999690] [2019-10-13 17:43:37,872 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1206860328] [2019-10-13 17:43:37,872 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:37,922 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-13 17:43:37,922 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:37,923 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-13 17:43:37,925 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:37,953 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2019-10-13 17:43:37,953 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:37,955 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 4] total 9 [2019-10-13 17:43:37,955 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53217750] [2019-10-13 17:43:37,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:43:37,956 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:37,956 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:43:37,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:37,956 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand 9 states. [2019-10-13 17:43:38,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:38,100 INFO L93 Difference]: Finished difference Result 71 states and 90 transitions. [2019-10-13 17:43:38,101 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-13 17:43:38,101 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2019-10-13 17:43:38,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:38,102 INFO L225 Difference]: With dead ends: 71 [2019-10-13 17:43:38,103 INFO L226 Difference]: Without dead ends: 48 [2019-10-13 17:43:38,104 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:38,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-10-13 17:43:38,111 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 43. [2019-10-13 17:43:38,111 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2019-10-13 17:43:38,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2019-10-13 17:43:38,113 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 27 [2019-10-13 17:43:38,114 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:38,114 INFO L462 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2019-10-13 17:43:38,114 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:43:38,115 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2019-10-13 17:43:38,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-13 17:43:38,116 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:38,117 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:38,320 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:38,320 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:38,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:38,321 INFO L82 PathProgramCache]: Analyzing trace with hash -890436781, now seen corresponding path program 4 times [2019-10-13 17:43:38,321 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:38,321 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1094891612] [2019-10-13 17:43:38,322 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,322 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,323 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:38,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,455 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-13 17:43:38,455 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1094891612] [2019-10-13 17:43:38,455 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35236977] [2019-10-13 17:43:38,456 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:38,501 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:38,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:38,502 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:43:38,505 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:38,526 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-13 17:43:38,527 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:38,527 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-13 17:43:38,527 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871531191] [2019-10-13 17:43:38,528 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-13 17:43:38,528 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:38,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-13 17:43:38,529 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:38,529 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 9 states. [2019-10-13 17:43:38,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:38,647 INFO L93 Difference]: Finished difference Result 74 states and 90 transitions. [2019-10-13 17:43:38,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-13 17:43:38,648 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 32 [2019-10-13 17:43:38,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:38,649 INFO L225 Difference]: With dead ends: 74 [2019-10-13 17:43:38,650 INFO L226 Difference]: Without dead ends: 46 [2019-10-13 17:43:38,651 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-13 17:43:38,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-10-13 17:43:38,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2019-10-13 17:43:38,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2019-10-13 17:43:38,664 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2019-10-13 17:43:38,665 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 32 [2019-10-13 17:43:38,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:38,669 INFO L462 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2019-10-13 17:43:38,670 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-13 17:43:38,670 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2019-10-13 17:43:38,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2019-10-13 17:43:38,671 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:38,671 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:38,872 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:38,872 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:38,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:38,873 INFO L82 PathProgramCache]: Analyzing trace with hash -250762123, now seen corresponding path program 5 times [2019-10-13 17:43:38,873 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:38,874 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073697152] [2019-10-13 17:43:38,874 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,874 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:38,876 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:38,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:38,970 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-13 17:43:38,971 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073697152] [2019-10-13 17:43:38,972 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [869622684] [2019-10-13 17:43:38,972 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:39,013 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 5 check-sat command(s) [2019-10-13 17:43:39,013 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:39,014 INFO L256 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-13 17:43:39,020 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:39,060 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2019-10-13 17:43:39,061 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:39,062 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 5] total 12 [2019-10-13 17:43:39,062 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1353014533] [2019-10-13 17:43:39,063 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:43:39,063 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:39,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:43:39,063 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:43:39,063 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 12 states. [2019-10-13 17:43:39,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:39,186 INFO L93 Difference]: Finished difference Result 86 states and 108 transitions. [2019-10-13 17:43:39,186 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:43:39,186 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2019-10-13 17:43:39,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:39,187 INFO L225 Difference]: With dead ends: 86 [2019-10-13 17:43:39,187 INFO L226 Difference]: Without dead ends: 58 [2019-10-13 17:43:39,188 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:43:39,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-10-13 17:43:39,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 53. [2019-10-13 17:43:39,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2019-10-13 17:43:39,194 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 63 transitions. [2019-10-13 17:43:39,194 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 63 transitions. Word has length 34 [2019-10-13 17:43:39,194 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:39,195 INFO L462 AbstractCegarLoop]: Abstraction has 53 states and 63 transitions. [2019-10-13 17:43:39,195 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:43:39,195 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 63 transitions. [2019-10-13 17:43:39,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-10-13 17:43:39,196 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:39,196 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:39,399 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:39,400 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:39,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:39,401 INFO L82 PathProgramCache]: Analyzing trace with hash -1537034928, now seen corresponding path program 6 times [2019-10-13 17:43:39,401 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:39,402 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932074955] [2019-10-13 17:43:39,402 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,402 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:39,402 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:39,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:39,535 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2019-10-13 17:43:39,535 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932074955] [2019-10-13 17:43:39,536 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1445008803] [2019-10-13 17:43:39,536 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:39,598 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-13 17:43:39,599 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:39,600 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-13 17:43:39,602 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:39,645 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:43:39,645 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:39,646 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6] total 14 [2019-10-13 17:43:39,646 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1492424888] [2019-10-13 17:43:39,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-13 17:43:39,647 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:39,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-13 17:43:39,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:39,647 INFO L87 Difference]: Start difference. First operand 53 states and 63 transitions. Second operand 14 states. [2019-10-13 17:43:39,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:39,814 INFO L93 Difference]: Finished difference Result 100 states and 126 transitions. [2019-10-13 17:43:39,814 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:43:39,814 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2019-10-13 17:43:39,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:39,816 INFO L225 Difference]: With dead ends: 100 [2019-10-13 17:43:39,816 INFO L226 Difference]: Without dead ends: 66 [2019-10-13 17:43:39,817 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 37 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=130, Unknown=0, NotChecked=0, Total=182 [2019-10-13 17:43:39,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-13 17:43:39,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2019-10-13 17:43:39,822 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2019-10-13 17:43:39,823 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 73 transitions. [2019-10-13 17:43:39,823 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 73 transitions. Word has length 39 [2019-10-13 17:43:39,824 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:39,824 INFO L462 AbstractCegarLoop]: Abstraction has 61 states and 73 transitions. [2019-10-13 17:43:39,824 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-13 17:43:39,824 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 73 transitions. [2019-10-13 17:43:39,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2019-10-13 17:43:39,825 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:39,825 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,026 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,027 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,028 INFO L82 PathProgramCache]: Analyzing trace with hash 747611417, now seen corresponding path program 7 times [2019-10-13 17:43:40,029 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,029 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [705533178] [2019-10-13 17:43:40,029 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,029 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,029 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,168 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 17:43:40,168 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [705533178] [2019-10-13 17:43:40,169 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94040719] [2019-10-13 17:43:40,169 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,230 INFO L256 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:43:40,232 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:40,253 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 17:43:40,254 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:40,254 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-13 17:43:40,254 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958819902] [2019-10-13 17:43:40,255 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-13 17:43:40,255 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-13 17:43:40,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:43:40,256 INFO L87 Difference]: Start difference. First operand 61 states and 73 transitions. Second operand 12 states. [2019-10-13 17:43:40,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,344 INFO L93 Difference]: Finished difference Result 104 states and 128 transitions. [2019-10-13 17:43:40,345 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-13 17:43:40,345 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 44 [2019-10-13 17:43:40,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,346 INFO L225 Difference]: With dead ends: 104 [2019-10-13 17:43:40,346 INFO L226 Difference]: Without dead ends: 64 [2019-10-13 17:43:40,350 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-13 17:43:40,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-13 17:43:40,358 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2019-10-13 17:43:40,359 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2019-10-13 17:43:40,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 75 transitions. [2019-10-13 17:43:40,360 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 75 transitions. Word has length 44 [2019-10-13 17:43:40,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,360 INFO L462 AbstractCegarLoop]: Abstraction has 63 states and 75 transitions. [2019-10-13 17:43:40,363 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-13 17:43:40,363 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 75 transitions. [2019-10-13 17:43:40,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2019-10-13 17:43:40,364 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,364 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:40,565 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,565 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:40,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:40,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1331800891, now seen corresponding path program 8 times [2019-10-13 17:43:40,566 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:40,567 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [668536684] [2019-10-13 17:43:40,567 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,567 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:40,568 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:40,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:40,692 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 17:43:40,693 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [668536684] [2019-10-13 17:43:40,693 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [429881915] [2019-10-13 17:43:40,693 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:40,759 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:40,759 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:40,760 INFO L256 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:43:40,763 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:40,785 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 17:43:40,785 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:40,785 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-13 17:43:40,786 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966756884] [2019-10-13 17:43:40,786 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-13 17:43:40,787 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:40,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-13 17:43:40,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:43:40,787 INFO L87 Difference]: Start difference. First operand 63 states and 75 transitions. Second operand 13 states. [2019-10-13 17:43:40,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:40,862 INFO L93 Difference]: Finished difference Result 106 states and 130 transitions. [2019-10-13 17:43:40,862 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-13 17:43:40,862 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 46 [2019-10-13 17:43:40,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:40,863 INFO L225 Difference]: With dead ends: 106 [2019-10-13 17:43:40,863 INFO L226 Difference]: Without dead ends: 66 [2019-10-13 17:43:40,864 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-13 17:43:40,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-10-13 17:43:40,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2019-10-13 17:43:40,869 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2019-10-13 17:43:40,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 77 transitions. [2019-10-13 17:43:40,870 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 77 transitions. Word has length 46 [2019-10-13 17:43:40,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:40,870 INFO L462 AbstractCegarLoop]: Abstraction has 65 states and 77 transitions. [2019-10-13 17:43:40,871 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-13 17:43:40,871 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 77 transitions. [2019-10-13 17:43:40,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2019-10-13 17:43:40,872 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:40,872 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,075 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,076 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,076 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,076 INFO L82 PathProgramCache]: Analyzing trace with hash 97169629, now seen corresponding path program 9 times [2019-10-13 17:43:41,077 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,077 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077874602] [2019-10-13 17:43:41,077 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,078 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,078 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,213 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2019-10-13 17:43:41,214 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077874602] [2019-10-13 17:43:41,214 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023440412] [2019-10-13 17:43:41,214 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,278 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-13 17:43:41,279 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:41,279 INFO L256 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,287 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,371 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 1 proven. 22 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2019-10-13 17:43:41,372 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:41,372 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 7] total 18 [2019-10-13 17:43:41,372 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023378400] [2019-10-13 17:43:41,373 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:43:41,373 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,373 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:43:41,373 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:41,373 INFO L87 Difference]: Start difference. First operand 65 states and 77 transitions. Second operand 18 states. [2019-10-13 17:43:41,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:41,523 INFO L93 Difference]: Finished difference Result 118 states and 148 transitions. [2019-10-13 17:43:41,524 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:43:41,524 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 48 [2019-10-13 17:43:41,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:41,524 INFO L225 Difference]: With dead ends: 118 [2019-10-13 17:43:41,525 INFO L226 Difference]: Without dead ends: 78 [2019-10-13 17:43:41,525 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=218, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:41,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2019-10-13 17:43:41,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 73. [2019-10-13 17:43:41,532 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2019-10-13 17:43:41,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 87 transitions. [2019-10-13 17:43:41,533 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 87 transitions. Word has length 48 [2019-10-13 17:43:41,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:41,533 INFO L462 AbstractCegarLoop]: Abstraction has 73 states and 87 transitions. [2019-10-13 17:43:41,533 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:43:41,533 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 87 transitions. [2019-10-13 17:43:41,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-13 17:43:41,534 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:41,534 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:41,734 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,735 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:41,735 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:41,736 INFO L82 PathProgramCache]: Analyzing trace with hash 830729064, now seen corresponding path program 10 times [2019-10-13 17:43:41,736 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:41,736 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [933409046] [2019-10-13 17:43:41,737 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,737 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:41,737 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:41,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:41,875 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:43:41,875 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [933409046] [2019-10-13 17:43:41,876 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854898277] [2019-10-13 17:43:41,876 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:41,933 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:41,933 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:41,934 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:43:41,936 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:41,960 INFO L134 CoverageAnalysis]: Checked inductivity of 136 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:43:41,960 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:41,960 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-13 17:43:41,961 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516969375] [2019-10-13 17:43:41,961 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-13 17:43:41,961 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:41,962 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-13 17:43:41,962 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:43:41,963 INFO L87 Difference]: Start difference. First operand 73 states and 87 transitions. Second operand 15 states. [2019-10-13 17:43:42,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,066 INFO L93 Difference]: Finished difference Result 122 states and 150 transitions. [2019-10-13 17:43:42,066 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-13 17:43:42,067 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 53 [2019-10-13 17:43:42,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,068 INFO L225 Difference]: With dead ends: 122 [2019-10-13 17:43:42,068 INFO L226 Difference]: Without dead ends: 76 [2019-10-13 17:43:42,068 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-13 17:43:42,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2019-10-13 17:43:42,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2019-10-13 17:43:42,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2019-10-13 17:43:42,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 89 transitions. [2019-10-13 17:43:42,074 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 89 transitions. Word has length 53 [2019-10-13 17:43:42,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,075 INFO L462 AbstractCegarLoop]: Abstraction has 75 states and 89 transitions. [2019-10-13 17:43:42,075 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-13 17:43:42,075 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 89 transitions. [2019-10-13 17:43:42,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-13 17:43:42,076 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,076 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:42,277 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,277 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:42,277 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:42,278 INFO L82 PathProgramCache]: Analyzing trace with hash 1163504518, now seen corresponding path program 11 times [2019-10-13 17:43:42,278 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:42,278 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445035508] [2019-10-13 17:43:42,278 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,278 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:42,278 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:42,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:42,413 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-13 17:43:42,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445035508] [2019-10-13 17:43:42,413 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214177763] [2019-10-13 17:43:42,414 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:42,500 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 11 check-sat command(s) [2019-10-13 17:43:42,501 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:42,501 INFO L256 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-13 17:43:42,503 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:42,616 INFO L134 CoverageAnalysis]: Checked inductivity of 157 backedges. 1 proven. 35 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2019-10-13 17:43:42,617 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:42,617 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 8] total 21 [2019-10-13 17:43:42,617 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152152486] [2019-10-13 17:43:42,617 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-13 17:43:42,618 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:42,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-13 17:43:42,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:43:42,618 INFO L87 Difference]: Start difference. First operand 75 states and 89 transitions. Second operand 21 states. [2019-10-13 17:43:42,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:42,799 INFO L93 Difference]: Finished difference Result 134 states and 168 transitions. [2019-10-13 17:43:42,799 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-13 17:43:42,799 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 55 [2019-10-13 17:43:42,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:42,800 INFO L225 Difference]: With dead ends: 134 [2019-10-13 17:43:42,801 INFO L226 Difference]: Without dead ends: 88 [2019-10-13 17:43:42,801 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=120, Invalid=300, Unknown=0, NotChecked=0, Total=420 [2019-10-13 17:43:42,802 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2019-10-13 17:43:42,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 83. [2019-10-13 17:43:42,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2019-10-13 17:43:42,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 99 transitions. [2019-10-13 17:43:42,807 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 99 transitions. Word has length 55 [2019-10-13 17:43:42,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:42,808 INFO L462 AbstractCegarLoop]: Abstraction has 83 states and 99 transitions. [2019-10-13 17:43:42,808 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-13 17:43:42,808 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 99 transitions. [2019-10-13 17:43:42,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2019-10-13 17:43:42,809 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:42,809 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,019 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,019 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,020 INFO L82 PathProgramCache]: Analyzing trace with hash -264767709, now seen corresponding path program 12 times [2019-10-13 17:43:43,020 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,020 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1149803987] [2019-10-13 17:43:43,021 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,021 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,022 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:43,200 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 52 trivial. 0 not checked. [2019-10-13 17:43:43,200 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1149803987] [2019-10-13 17:43:43,201 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678613594] [2019-10-13 17:43:43,201 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,439 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-13 17:43:43,439 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:43,440 INFO L256 TraceCheckSpWp]: Trace formula consists of 187 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-13 17:43:43,442 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:43,558 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 1 proven. 51 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2019-10-13 17:43:43,558 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:43,559 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 9] total 23 [2019-10-13 17:43:43,559 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138951253] [2019-10-13 17:43:43,560 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 17:43:43,560 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:43,560 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 17:43:43,561 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:43:43,561 INFO L87 Difference]: Start difference. First operand 83 states and 99 transitions. Second operand 23 states. [2019-10-13 17:43:43,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:43,751 INFO L93 Difference]: Finished difference Result 148 states and 186 transitions. [2019-10-13 17:43:43,751 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 17:43:43,752 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2019-10-13 17:43:43,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:43,753 INFO L225 Difference]: With dead ends: 148 [2019-10-13 17:43:43,753 INFO L226 Difference]: Without dead ends: 96 [2019-10-13 17:43:43,754 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=142, Invalid=364, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:43:43,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-13 17:43:43,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 91. [2019-10-13 17:43:43,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2019-10-13 17:43:43,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 109 transitions. [2019-10-13 17:43:43,761 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 109 transitions. Word has length 60 [2019-10-13 17:43:43,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:43,761 INFO L462 AbstractCegarLoop]: Abstraction has 91 states and 109 transitions. [2019-10-13 17:43:43,761 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 17:43:43,761 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 109 transitions. [2019-10-13 17:43:43,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2019-10-13 17:43:43,762 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:43,762 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:43,962 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:43,963 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:43,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:43,964 INFO L82 PathProgramCache]: Analyzing trace with hash 980957794, now seen corresponding path program 13 times [2019-10-13 17:43:43,964 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:43,964 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1024425940] [2019-10-13 17:43:43,965 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,965 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:43,965 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:43,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,429 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-13 17:43:44,430 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1024425940] [2019-10-13 17:43:44,430 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107834750] [2019-10-13 17:43:44,430 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:44,484 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:43:44,486 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:44,509 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-13 17:43:44,509 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:44,509 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-13 17:43:44,510 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1748296431] [2019-10-13 17:43:44,510 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-13 17:43:44,510 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:44,511 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-13 17:43:44,511 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:44,511 INFO L87 Difference]: Start difference. First operand 91 states and 109 transitions. Second operand 18 states. [2019-10-13 17:43:44,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:44,639 INFO L93 Difference]: Finished difference Result 152 states and 188 transitions. [2019-10-13 17:43:44,639 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-13 17:43:44,639 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 65 [2019-10-13 17:43:44,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:44,640 INFO L225 Difference]: With dead ends: 152 [2019-10-13 17:43:44,640 INFO L226 Difference]: Without dead ends: 94 [2019-10-13 17:43:44,641 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-13 17:43:44,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-13 17:43:44,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2019-10-13 17:43:44,645 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2019-10-13 17:43:44,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 111 transitions. [2019-10-13 17:43:44,646 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 111 transitions. Word has length 65 [2019-10-13 17:43:44,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:44,646 INFO L462 AbstractCegarLoop]: Abstraction has 93 states and 111 transitions. [2019-10-13 17:43:44,646 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-13 17:43:44,646 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 111 transitions. [2019-10-13 17:43:44,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-13 17:43:44,647 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:44,647 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:44,851 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:44,851 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:44,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:44,852 INFO L82 PathProgramCache]: Analyzing trace with hash 1862843776, now seen corresponding path program 14 times [2019-10-13 17:43:44,852 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:44,852 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788963640] [2019-10-13 17:43:44,853 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,853 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:44,853 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:44,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,023 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-13 17:43:45,023 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788963640] [2019-10-13 17:43:45,024 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1214028798] [2019-10-13 17:43:45,024 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,085 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:45,085 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:45,086 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:43:45,087 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:45,103 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-13 17:43:45,103 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:45,104 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-13 17:43:45,104 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861149040] [2019-10-13 17:43:45,104 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-13 17:43:45,104 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:45,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-13 17:43:45,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:43:45,105 INFO L87 Difference]: Start difference. First operand 93 states and 111 transitions. Second operand 19 states. [2019-10-13 17:43:45,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:45,272 INFO L93 Difference]: Finished difference Result 154 states and 190 transitions. [2019-10-13 17:43:45,272 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-13 17:43:45,273 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 67 [2019-10-13 17:43:45,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:45,273 INFO L225 Difference]: With dead ends: 154 [2019-10-13 17:43:45,274 INFO L226 Difference]: Without dead ends: 96 [2019-10-13 17:43:45,274 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-13 17:43:45,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2019-10-13 17:43:45,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2019-10-13 17:43:45,279 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2019-10-13 17:43:45,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 113 transitions. [2019-10-13 17:43:45,280 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 113 transitions. Word has length 67 [2019-10-13 17:43:45,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:45,281 INFO L462 AbstractCegarLoop]: Abstraction has 95 states and 113 transitions. [2019-10-13 17:43:45,281 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-13 17:43:45,281 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 113 transitions. [2019-10-13 17:43:45,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2019-10-13 17:43:45,282 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:45,282 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:45,485 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,485 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:45,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:45,486 INFO L82 PathProgramCache]: Analyzing trace with hash -1048252130, now seen corresponding path program 15 times [2019-10-13 17:43:45,486 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:45,487 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2846851] [2019-10-13 17:43:45,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,487 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:45,488 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:45,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:45,701 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2019-10-13 17:43:45,702 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2846851] [2019-10-13 17:43:45,702 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1838187110] [2019-10-13 17:43:45,702 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:45,789 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-13 17:43:45,789 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:45,790 INFO L256 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-13 17:43:45,791 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:45,886 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 1 proven. 70 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2019-10-13 17:43:45,887 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:45,887 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 10] total 27 [2019-10-13 17:43:45,887 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598133910] [2019-10-13 17:43:45,887 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 17:43:45,887 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:45,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 17:43:45,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:45,888 INFO L87 Difference]: Start difference. First operand 95 states and 113 transitions. Second operand 27 states. [2019-10-13 17:43:46,123 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:46,123 INFO L93 Difference]: Finished difference Result 166 states and 208 transitions. [2019-10-13 17:43:46,124 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2019-10-13 17:43:46,124 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 69 [2019-10-13 17:43:46,124 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:46,125 INFO L225 Difference]: With dead ends: 166 [2019-10-13 17:43:46,125 INFO L226 Difference]: Without dead ends: 108 [2019-10-13 17:43:46,126 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=199, Invalid=503, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:46,126 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2019-10-13 17:43:46,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 103. [2019-10-13 17:43:46,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2019-10-13 17:43:46,130 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 123 transitions. [2019-10-13 17:43:46,131 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 123 transitions. Word has length 69 [2019-10-13 17:43:46,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:46,131 INFO L462 AbstractCegarLoop]: Abstraction has 103 states and 123 transitions. [2019-10-13 17:43:46,131 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 17:43:46,131 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 123 transitions. [2019-10-13 17:43:46,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2019-10-13 17:43:46,132 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:46,132 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:46,336 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:46,337 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:46,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:46,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1331337461, now seen corresponding path program 16 times [2019-10-13 17:43:46,337 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:46,338 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1339052258] [2019-10-13 17:43:46,338 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:46,338 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:46,338 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:46,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:46,528 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 93 trivial. 0 not checked. [2019-10-13 17:43:46,528 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1339052258] [2019-10-13 17:43:46,528 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815646492] [2019-10-13 17:43:46,528 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:46,592 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:46,592 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:46,597 INFO L256 TraceCheckSpWp]: Trace formula consists of 227 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-13 17:43:46,599 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:46,746 INFO L134 CoverageAnalysis]: Checked inductivity of 349 backedges. 1 proven. 92 refuted. 0 times theorem prover too weak. 256 trivial. 0 not checked. [2019-10-13 17:43:46,746 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:46,746 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11] total 29 [2019-10-13 17:43:46,747 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [761766669] [2019-10-13 17:43:46,747 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 17:43:46,747 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:46,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 17:43:46,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:43:46,748 INFO L87 Difference]: Start difference. First operand 103 states and 123 transitions. Second operand 29 states. [2019-10-13 17:43:46,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:46,921 INFO L93 Difference]: Finished difference Result 180 states and 226 transitions. [2019-10-13 17:43:46,921 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-13 17:43:46,922 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 74 [2019-10-13 17:43:46,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:46,923 INFO L225 Difference]: With dead ends: 180 [2019-10-13 17:43:46,923 INFO L226 Difference]: Without dead ends: 116 [2019-10-13 17:43:46,924 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 94 GetRequests, 67 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=227, Invalid=585, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:43:46,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2019-10-13 17:43:46,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 111. [2019-10-13 17:43:46,929 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2019-10-13 17:43:46,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 133 transitions. [2019-10-13 17:43:46,930 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 133 transitions. Word has length 74 [2019-10-13 17:43:46,930 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:46,930 INFO L462 AbstractCegarLoop]: Abstraction has 111 states and 133 transitions. [2019-10-13 17:43:46,931 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-13 17:43:46,931 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 133 transitions. [2019-10-13 17:43:46,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-13 17:43:46,931 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:46,932 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:47,135 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,136 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:47,136 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:47,137 INFO L82 PathProgramCache]: Analyzing trace with hash 261485818, now seen corresponding path program 17 times [2019-10-13 17:43:47,137 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:47,137 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [214674646] [2019-10-13 17:43:47,138 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,138 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:47,138 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:47,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:47,356 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 118 trivial. 0 not checked. [2019-10-13 17:43:47,356 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [214674646] [2019-10-13 17:43:47,356 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285236437] [2019-10-13 17:43:47,357 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:47,629 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 17 check-sat command(s) [2019-10-13 17:43:47,629 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:47,631 INFO L256 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-13 17:43:47,632 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:47,824 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 1 proven. 117 refuted. 0 times theorem prover too weak. 289 trivial. 0 not checked. [2019-10-13 17:43:47,825 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:47,825 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 12] total 31 [2019-10-13 17:43:47,825 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814961666] [2019-10-13 17:43:47,825 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-13 17:43:47,826 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:47,826 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-13 17:43:47,826 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:43:47,827 INFO L87 Difference]: Start difference. First operand 111 states and 133 transitions. Second operand 31 states. [2019-10-13 17:43:48,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:48,164 INFO L93 Difference]: Finished difference Result 194 states and 244 transitions. [2019-10-13 17:43:48,165 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2019-10-13 17:43:48,165 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 79 [2019-10-13 17:43:48,165 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:48,166 INFO L225 Difference]: With dead ends: 194 [2019-10-13 17:43:48,166 INFO L226 Difference]: Without dead ends: 124 [2019-10-13 17:43:48,167 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 187 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=257, Invalid=673, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:43:48,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-10-13 17:43:48,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 119. [2019-10-13 17:43:48,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2019-10-13 17:43:48,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 143 transitions. [2019-10-13 17:43:48,172 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 143 transitions. Word has length 79 [2019-10-13 17:43:48,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:48,172 INFO L462 AbstractCegarLoop]: Abstraction has 119 states and 143 transitions. [2019-10-13 17:43:48,172 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-13 17:43:48,172 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 143 transitions. [2019-10-13 17:43:48,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2019-10-13 17:43:48,173 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:48,173 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:48,374 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:48,374 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:48,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:48,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1674935505, now seen corresponding path program 18 times [2019-10-13 17:43:48,375 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:48,375 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362263904] [2019-10-13 17:43:48,375 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,375 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:48,376 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:48,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:48,615 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:48,615 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362263904] [2019-10-13 17:43:48,616 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [118876737] [2019-10-13 17:43:48,616 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:49,190 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 19 check-sat command(s) [2019-10-13 17:43:49,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:49,193 INFO L256 TraceCheckSpWp]: Trace formula consists of 255 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-13 17:43:49,194 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:49,222 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:49,222 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:49,223 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-13 17:43:49,223 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607532816] [2019-10-13 17:43:49,223 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-13 17:43:49,223 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:49,224 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-13 17:43:49,224 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:43:49,224 INFO L87 Difference]: Start difference. First operand 119 states and 143 transitions. Second operand 23 states. [2019-10-13 17:43:49,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:49,374 INFO L93 Difference]: Finished difference Result 198 states and 246 transitions. [2019-10-13 17:43:49,376 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-13 17:43:49,377 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 84 [2019-10-13 17:43:49,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:49,378 INFO L225 Difference]: With dead ends: 198 [2019-10-13 17:43:49,378 INFO L226 Difference]: Without dead ends: 122 [2019-10-13 17:43:49,378 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 85 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-13 17:43:49,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2019-10-13 17:43:49,382 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2019-10-13 17:43:49,382 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2019-10-13 17:43:49,383 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 145 transitions. [2019-10-13 17:43:49,383 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 145 transitions. Word has length 84 [2019-10-13 17:43:49,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:49,383 INFO L462 AbstractCegarLoop]: Abstraction has 121 states and 145 transitions. [2019-10-13 17:43:49,384 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-13 17:43:49,384 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 145 transitions. [2019-10-13 17:43:49,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2019-10-13 17:43:49,385 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:49,385 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:49,588 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:49,589 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:49,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:49,589 INFO L82 PathProgramCache]: Analyzing trace with hash 1933852497, now seen corresponding path program 19 times [2019-10-13 17:43:49,590 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:49,590 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117999697] [2019-10-13 17:43:49,590 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:49,590 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:49,591 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:49,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,830 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:49,830 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117999697] [2019-10-13 17:43:49,830 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [483636652] [2019-10-13 17:43:49,830 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:49,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:49,903 INFO L256 TraceCheckSpWp]: Trace formula consists of 261 conjuncts, 21 conjunts are in the unsatisfiable core [2019-10-13 17:43:49,904 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:49,921 INFO L134 CoverageAnalysis]: Checked inductivity of 507 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:49,921 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:49,921 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-10-13 17:43:49,922 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [584240416] [2019-10-13 17:43:49,922 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-10-13 17:43:49,922 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:49,922 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-10-13 17:43:49,923 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:43:49,923 INFO L87 Difference]: Start difference. First operand 121 states and 145 transitions. Second operand 24 states. [2019-10-13 17:43:50,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:50,066 INFO L93 Difference]: Finished difference Result 200 states and 248 transitions. [2019-10-13 17:43:50,067 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-10-13 17:43:50,067 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 86 [2019-10-13 17:43:50,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:50,069 INFO L225 Difference]: With dead ends: 200 [2019-10-13 17:43:50,069 INFO L226 Difference]: Without dead ends: 124 [2019-10-13 17:43:50,070 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-10-13 17:43:50,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2019-10-13 17:43:50,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2019-10-13 17:43:50,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2019-10-13 17:43:50,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 147 transitions. [2019-10-13 17:43:50,075 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 147 transitions. Word has length 86 [2019-10-13 17:43:50,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:50,076 INFO L462 AbstractCegarLoop]: Abstraction has 123 states and 147 transitions. [2019-10-13 17:43:50,076 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-10-13 17:43:50,076 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 147 transitions. [2019-10-13 17:43:50,077 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2019-10-13 17:43:50,077 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:50,077 INFO L380 BasicCegarLoop]: trace histogram [20, 20, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:50,280 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:50,281 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:50,281 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:50,281 INFO L82 PathProgramCache]: Analyzing trace with hash -354452749, now seen corresponding path program 20 times [2019-10-13 17:43:50,281 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:50,282 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1992811669] [2019-10-13 17:43:50,282 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:50,282 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:50,282 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:50,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:50,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:50,559 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:50,559 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1992811669] [2019-10-13 17:43:50,559 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [731819734] [2019-10-13 17:43:50,559 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:50,632 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:50,633 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:50,634 INFO L256 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 22 conjunts are in the unsatisfiable core [2019-10-13 17:43:50,635 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:50,653 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:50,654 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:50,654 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-10-13 17:43:50,654 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502687379] [2019-10-13 17:43:50,655 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-10-13 17:43:50,655 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:50,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-10-13 17:43:50,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:43:50,656 INFO L87 Difference]: Start difference. First operand 123 states and 147 transitions. Second operand 25 states. [2019-10-13 17:43:50,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:50,828 INFO L93 Difference]: Finished difference Result 202 states and 250 transitions. [2019-10-13 17:43:50,829 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-10-13 17:43:50,829 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 88 [2019-10-13 17:43:50,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:50,830 INFO L225 Difference]: With dead ends: 202 [2019-10-13 17:43:50,831 INFO L226 Difference]: Without dead ends: 126 [2019-10-13 17:43:50,832 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 89 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-10-13 17:43:50,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2019-10-13 17:43:50,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2019-10-13 17:43:50,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2019-10-13 17:43:50,837 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 149 transitions. [2019-10-13 17:43:50,837 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 149 transitions. Word has length 88 [2019-10-13 17:43:50,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:50,838 INFO L462 AbstractCegarLoop]: Abstraction has 125 states and 149 transitions. [2019-10-13 17:43:50,838 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-10-13 17:43:50,838 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 149 transitions. [2019-10-13 17:43:50,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2019-10-13 17:43:50,839 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:50,839 INFO L380 BasicCegarLoop]: trace histogram [21, 21, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:51,042 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:51,043 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:51,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:51,043 INFO L82 PathProgramCache]: Analyzing trace with hash -392538603, now seen corresponding path program 21 times [2019-10-13 17:43:51,043 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:51,043 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713771188] [2019-10-13 17:43:51,043 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:51,043 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:51,043 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:51,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:51,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:51,358 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 146 trivial. 0 not checked. [2019-10-13 17:43:51,359 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713771188] [2019-10-13 17:43:51,359 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186666656] [2019-10-13 17:43:51,359 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:51,510 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-10-13 17:43:51,510 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:51,512 INFO L256 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-13 17:43:51,513 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:51,751 INFO L134 CoverageAnalysis]: Checked inductivity of 587 backedges. 1 proven. 145 refuted. 0 times theorem prover too weak. 441 trivial. 0 not checked. [2019-10-13 17:43:51,752 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:51,752 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 13] total 36 [2019-10-13 17:43:51,752 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159474032] [2019-10-13 17:43:51,753 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-13 17:43:51,753 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:51,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-13 17:43:51,754 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:43:51,754 INFO L87 Difference]: Start difference. First operand 125 states and 149 transitions. Second operand 36 states. [2019-10-13 17:43:52,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:52,082 INFO L93 Difference]: Finished difference Result 214 states and 268 transitions. [2019-10-13 17:43:52,082 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-13 17:43:52,082 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 90 [2019-10-13 17:43:52,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:52,083 INFO L225 Difference]: With dead ends: 214 [2019-10-13 17:43:52,084 INFO L226 Difference]: Without dead ends: 138 [2019-10-13 17:43:52,084 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 81 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=355, Invalid=905, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:43:52,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 138 states. [2019-10-13 17:43:52,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 138 to 133. [2019-10-13 17:43:52,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 133 states. [2019-10-13 17:43:52,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 159 transitions. [2019-10-13 17:43:52,090 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 159 transitions. Word has length 90 [2019-10-13 17:43:52,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:52,090 INFO L462 AbstractCegarLoop]: Abstraction has 133 states and 159 transitions. [2019-10-13 17:43:52,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-13 17:43:52,090 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 159 transitions. [2019-10-13 17:43:52,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2019-10-13 17:43:52,091 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:52,091 INFO L380 BasicCegarLoop]: trace histogram [22, 22, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:52,295 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:52,295 INFO L410 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:52,296 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:52,296 INFO L82 PathProgramCache]: Analyzing trace with hash 1768371632, now seen corresponding path program 22 times [2019-10-13 17:43:52,296 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:52,296 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2102784848] [2019-10-13 17:43:52,297 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:52,297 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:52,297 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:52,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:52,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:52,707 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-13 17:43:52,707 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2102784848] [2019-10-13 17:43:52,707 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1975616538] [2019-10-13 17:43:52,708 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:52,814 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:43:52,814 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:52,815 INFO L256 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 24 conjunts are in the unsatisfiable core [2019-10-13 17:43:52,817 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:52,838 INFO L134 CoverageAnalysis]: Checked inductivity of 661 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-13 17:43:52,838 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:52,838 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-10-13 17:43:52,838 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1251916279] [2019-10-13 17:43:52,839 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-10-13 17:43:52,839 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:52,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-10-13 17:43:52,840 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:52,840 INFO L87 Difference]: Start difference. First operand 133 states and 159 transitions. Second operand 27 states. [2019-10-13 17:43:53,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:53,019 INFO L93 Difference]: Finished difference Result 218 states and 270 transitions. [2019-10-13 17:43:53,019 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-13 17:43:53,019 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 95 [2019-10-13 17:43:53,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:53,021 INFO L225 Difference]: With dead ends: 218 [2019-10-13 17:43:53,021 INFO L226 Difference]: Without dead ends: 136 [2019-10-13 17:43:53,021 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 96 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-10-13 17:43:53,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2019-10-13 17:43:53,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 135. [2019-10-13 17:43:53,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 135 states. [2019-10-13 17:43:53,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 135 states to 135 states and 161 transitions. [2019-10-13 17:43:53,026 INFO L78 Accepts]: Start accepts. Automaton has 135 states and 161 transitions. Word has length 95 [2019-10-13 17:43:53,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:53,026 INFO L462 AbstractCegarLoop]: Abstraction has 135 states and 161 transitions. [2019-10-13 17:43:53,027 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-10-13 17:43:53,027 INFO L276 IsEmpty]: Start isEmpty. Operand 135 states and 161 transitions. [2019-10-13 17:43:53,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-13 17:43:53,027 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:53,028 INFO L380 BasicCegarLoop]: trace histogram [23, 23, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:53,231 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:53,231 INFO L410 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:53,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:53,232 INFO L82 PathProgramCache]: Analyzing trace with hash -742920114, now seen corresponding path program 23 times [2019-10-13 17:43:53,232 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:53,232 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316619158] [2019-10-13 17:43:53,232 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,233 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:53,233 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:53,252 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:53,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:53,574 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 177 trivial. 0 not checked. [2019-10-13 17:43:53,574 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316619158] [2019-10-13 17:43:53,574 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683748733] [2019-10-13 17:43:53,575 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:54,312 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 23 check-sat command(s) [2019-10-13 17:43:54,312 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:54,316 INFO L256 TraceCheckSpWp]: Trace formula consists of 234 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-13 17:43:54,317 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:54,558 INFO L134 CoverageAnalysis]: Checked inductivity of 706 backedges. 1 proven. 176 refuted. 0 times theorem prover too weak. 529 trivial. 0 not checked. [2019-10-13 17:43:54,558 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:54,558 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 14] total 39 [2019-10-13 17:43:54,558 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [506406987] [2019-10-13 17:43:54,559 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-13 17:43:54,559 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:54,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-13 17:43:54,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-10-13 17:43:54,560 INFO L87 Difference]: Start difference. First operand 135 states and 161 transitions. Second operand 39 states. [2019-10-13 17:43:54,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:54,924 INFO L93 Difference]: Finished difference Result 230 states and 288 transitions. [2019-10-13 17:43:54,924 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2019-10-13 17:43:54,924 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 97 [2019-10-13 17:43:54,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:54,926 INFO L225 Difference]: With dead ends: 230 [2019-10-13 17:43:54,926 INFO L226 Difference]: Without dead ends: 148 [2019-10-13 17:43:54,927 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 299 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=417, Invalid=1065, Unknown=0, NotChecked=0, Total=1482 [2019-10-13 17:43:54,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-10-13 17:43:54,933 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 143. [2019-10-13 17:43:54,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 143 states. [2019-10-13 17:43:54,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 171 transitions. [2019-10-13 17:43:54,935 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 171 transitions. Word has length 97 [2019-10-13 17:43:54,935 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:54,935 INFO L462 AbstractCegarLoop]: Abstraction has 143 states and 171 transitions. [2019-10-13 17:43:54,935 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-13 17:43:54,936 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 171 transitions. [2019-10-13 17:43:54,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-13 17:43:54,937 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:54,937 INFO L380 BasicCegarLoop]: trace histogram [24, 24, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:55,146 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:55,146 INFO L410 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:55,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:55,146 INFO L82 PathProgramCache]: Analyzing trace with hash -1743015205, now seen corresponding path program 24 times [2019-10-13 17:43:55,146 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:55,147 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427582583] [2019-10-13 17:43:55,147 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:55,147 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:55,147 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:55,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:55,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:55,510 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:55,511 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427582583] [2019-10-13 17:43:55,511 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1137004977] [2019-10-13 17:43:55,511 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,519 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 25 check-sat command(s) [2019-10-13 17:43:56,519 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:56,522 INFO L256 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-13 17:43:56,524 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:56,570 INFO L134 CoverageAnalysis]: Checked inductivity of 787 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:56,571 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:56,571 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 27] total 29 [2019-10-13 17:43:56,571 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995019542] [2019-10-13 17:43:56,571 INFO L442 AbstractCegarLoop]: Interpolant automaton has 29 states [2019-10-13 17:43:56,572 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:56,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2019-10-13 17:43:56,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:43:56,573 INFO L87 Difference]: Start difference. First operand 143 states and 171 transitions. Second operand 29 states. [2019-10-13 17:43:56,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:56,751 INFO L93 Difference]: Finished difference Result 234 states and 290 transitions. [2019-10-13 17:43:56,752 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2019-10-13 17:43:56,752 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 102 [2019-10-13 17:43:56,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:56,753 INFO L225 Difference]: With dead ends: 234 [2019-10-13 17:43:56,753 INFO L226 Difference]: Without dead ends: 146 [2019-10-13 17:43:56,754 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 130 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2019-10-13 17:43:56,755 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2019-10-13 17:43:56,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 145. [2019-10-13 17:43:56,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 145 states. [2019-10-13 17:43:56,759 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 173 transitions. [2019-10-13 17:43:56,759 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 173 transitions. Word has length 102 [2019-10-13 17:43:56,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:56,759 INFO L462 AbstractCegarLoop]: Abstraction has 145 states and 173 transitions. [2019-10-13 17:43:56,759 INFO L463 AbstractCegarLoop]: Interpolant automaton has 29 states. [2019-10-13 17:43:56,759 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 173 transitions. [2019-10-13 17:43:56,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2019-10-13 17:43:56,760 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:56,760 INFO L380 BasicCegarLoop]: trace histogram [25, 25, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:56,965 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:56,965 INFO L410 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:56,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:56,966 INFO L82 PathProgramCache]: Analyzing trace with hash -1419810179, now seen corresponding path program 25 times [2019-10-13 17:43:56,966 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:56,967 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1549712664] [2019-10-13 17:43:56,967 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,967 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:56,967 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:56,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,398 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:57,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1549712664] [2019-10-13 17:43:57,398 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [667045656] [2019-10-13 17:43:57,399 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:57,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:57,489 INFO L256 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 27 conjunts are in the unsatisfiable core [2019-10-13 17:43:57,491 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:57,528 INFO L134 CoverageAnalysis]: Checked inductivity of 836 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:57,529 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:57,529 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 28] total 30 [2019-10-13 17:43:57,529 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2096920349] [2019-10-13 17:43:57,530 INFO L442 AbstractCegarLoop]: Interpolant automaton has 30 states [2019-10-13 17:43:57,530 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:57,530 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2019-10-13 17:43:57,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:43:57,531 INFO L87 Difference]: Start difference. First operand 145 states and 173 transitions. Second operand 30 states. [2019-10-13 17:43:57,725 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:57,726 INFO L93 Difference]: Finished difference Result 236 states and 292 transitions. [2019-10-13 17:43:57,726 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2019-10-13 17:43:57,726 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 104 [2019-10-13 17:43:57,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:57,728 INFO L225 Difference]: With dead ends: 236 [2019-10-13 17:43:57,728 INFO L226 Difference]: Without dead ends: 148 [2019-10-13 17:43:57,729 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 133 GetRequests, 105 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2019-10-13 17:43:57,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2019-10-13 17:43:57,733 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2019-10-13 17:43:57,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2019-10-13 17:43:57,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 175 transitions. [2019-10-13 17:43:57,734 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 175 transitions. Word has length 104 [2019-10-13 17:43:57,734 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:57,734 INFO L462 AbstractCegarLoop]: Abstraction has 147 states and 175 transitions. [2019-10-13 17:43:57,734 INFO L463 AbstractCegarLoop]: Interpolant automaton has 30 states. [2019-10-13 17:43:57,735 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 175 transitions. [2019-10-13 17:43:57,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2019-10-13 17:43:57,735 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:57,735 INFO L380 BasicCegarLoop]: trace histogram [26, 26, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:57,936 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:57,936 INFO L410 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:57,937 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:57,937 INFO L82 PathProgramCache]: Analyzing trace with hash -57425505, now seen corresponding path program 26 times [2019-10-13 17:43:57,937 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:57,938 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767047623] [2019-10-13 17:43:57,938 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:57,938 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:57,938 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:57,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:58,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:58,455 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:58,455 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767047623] [2019-10-13 17:43:58,456 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1876688858] [2019-10-13 17:43:58,456 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:58,584 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:43:58,584 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:58,587 INFO L256 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 28 conjunts are in the unsatisfiable core [2019-10-13 17:43:58,590 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:58,627 INFO L134 CoverageAnalysis]: Checked inductivity of 887 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:58,627 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:58,627 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29] total 31 [2019-10-13 17:43:58,628 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [32383134] [2019-10-13 17:43:58,629 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-13 17:43:58,630 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:58,630 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-13 17:43:58,631 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:43:58,631 INFO L87 Difference]: Start difference. First operand 147 states and 175 transitions. Second operand 31 states. [2019-10-13 17:43:58,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:43:58,917 INFO L93 Difference]: Finished difference Result 238 states and 294 transitions. [2019-10-13 17:43:58,917 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2019-10-13 17:43:58,917 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 106 [2019-10-13 17:43:58,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:43:58,919 INFO L225 Difference]: With dead ends: 238 [2019-10-13 17:43:58,919 INFO L226 Difference]: Without dead ends: 150 [2019-10-13 17:43:58,920 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 107 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 76 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2019-10-13 17:43:58,920 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2019-10-13 17:43:58,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 149. [2019-10-13 17:43:58,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 149 states. [2019-10-13 17:43:58,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 149 states to 149 states and 177 transitions. [2019-10-13 17:43:58,925 INFO L78 Accepts]: Start accepts. Automaton has 149 states and 177 transitions. Word has length 106 [2019-10-13 17:43:58,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:43:58,926 INFO L462 AbstractCegarLoop]: Abstraction has 149 states and 177 transitions. [2019-10-13 17:43:58,926 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-13 17:43:58,926 INFO L276 IsEmpty]: Start isEmpty. Operand 149 states and 177 transitions. [2019-10-13 17:43:58,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2019-10-13 17:43:58,927 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:43:58,927 INFO L380 BasicCegarLoop]: trace histogram [27, 27, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:43:59,131 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:59,131 INFO L410 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:43:59,131 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:43:59,131 INFO L82 PathProgramCache]: Analyzing trace with hash -770779071, now seen corresponding path program 27 times [2019-10-13 17:43:59,131 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:43:59,132 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231337715] [2019-10-13 17:43:59,132 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:59,132 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:43:59,132 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:43:59,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:59,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:43:59,546 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 211 trivial. 0 not checked. [2019-10-13 17:43:59,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231337715] [2019-10-13 17:43:59,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [497755221] [2019-10-13 17:43:59,547 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:43:59,752 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2019-10-13 17:43:59,752 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:43:59,754 INFO L256 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-13 17:43:59,756 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:43:59,982 INFO L134 CoverageAnalysis]: Checked inductivity of 940 backedges. 1 proven. 210 refuted. 0 times theorem prover too weak. 729 trivial. 0 not checked. [2019-10-13 17:43:59,982 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:43:59,982 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 15] total 44 [2019-10-13 17:43:59,982 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401748819] [2019-10-13 17:43:59,983 INFO L442 AbstractCegarLoop]: Interpolant automaton has 44 states [2019-10-13 17:43:59,983 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:43:59,983 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2019-10-13 17:43:59,984 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-10-13 17:43:59,984 INFO L87 Difference]: Start difference. First operand 149 states and 177 transitions. Second operand 44 states. [2019-10-13 17:44:00,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:00,385 INFO L93 Difference]: Finished difference Result 250 states and 312 transitions. [2019-10-13 17:44:00,385 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2019-10-13 17:44:00,385 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 108 [2019-10-13 17:44:00,385 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:00,386 INFO L225 Difference]: With dead ends: 250 [2019-10-13 17:44:00,386 INFO L226 Difference]: Without dead ends: 162 [2019-10-13 17:44:00,388 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 97 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=541, Invalid=1351, Unknown=0, NotChecked=0, Total=1892 [2019-10-13 17:44:00,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2019-10-13 17:44:00,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 157. [2019-10-13 17:44:00,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2019-10-13 17:44:00,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 187 transitions. [2019-10-13 17:44:00,394 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 187 transitions. Word has length 108 [2019-10-13 17:44:00,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:00,394 INFO L462 AbstractCegarLoop]: Abstraction has 157 states and 187 transitions. [2019-10-13 17:44:00,395 INFO L463 AbstractCegarLoop]: Interpolant automaton has 44 states. [2019-10-13 17:44:00,395 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 187 transitions. [2019-10-13 17:44:00,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 114 [2019-10-13 17:44:00,395 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:00,396 INFO L380 BasicCegarLoop]: trace histogram [28, 28, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:00,600 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:00,600 INFO L410 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:00,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:00,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1597532292, now seen corresponding path program 28 times [2019-10-13 17:44:00,601 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:00,601 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [135108404] [2019-10-13 17:44:00,601 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:00,602 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:00,602 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:00,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:01,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:01,131 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-13 17:44:01,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [135108404] [2019-10-13 17:44:01,131 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2037390290] [2019-10-13 17:44:01,131 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:01,235 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:44:01,235 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:01,236 INFO L256 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-13 17:44:01,238 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:01,260 INFO L134 CoverageAnalysis]: Checked inductivity of 1032 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-13 17:44:01,260 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:01,260 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 31] total 33 [2019-10-13 17:44:01,261 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1983103399] [2019-10-13 17:44:01,261 INFO L442 AbstractCegarLoop]: Interpolant automaton has 33 states [2019-10-13 17:44:01,261 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:01,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2019-10-13 17:44:01,262 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:44:01,262 INFO L87 Difference]: Start difference. First operand 157 states and 187 transitions. Second operand 33 states. [2019-10-13 17:44:01,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:01,420 INFO L93 Difference]: Finished difference Result 254 states and 314 transitions. [2019-10-13 17:44:01,420 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2019-10-13 17:44:01,420 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 113 [2019-10-13 17:44:01,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:01,422 INFO L225 Difference]: With dead ends: 254 [2019-10-13 17:44:01,422 INFO L226 Difference]: Without dead ends: 160 [2019-10-13 17:44:01,423 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 145 GetRequests, 114 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 82 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2019-10-13 17:44:01,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2019-10-13 17:44:01,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 159. [2019-10-13 17:44:01,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 159 states. [2019-10-13 17:44:01,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 189 transitions. [2019-10-13 17:44:01,432 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 189 transitions. Word has length 113 [2019-10-13 17:44:01,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:01,432 INFO L462 AbstractCegarLoop]: Abstraction has 159 states and 189 transitions. [2019-10-13 17:44:01,432 INFO L463 AbstractCegarLoop]: Interpolant automaton has 33 states. [2019-10-13 17:44:01,432 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 189 transitions. [2019-10-13 17:44:01,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2019-10-13 17:44:01,433 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:01,433 INFO L380 BasicCegarLoop]: trace histogram [29, 29, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:01,637 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:01,637 INFO L410 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:01,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:01,637 INFO L82 PathProgramCache]: Analyzing trace with hash -1883834462, now seen corresponding path program 29 times [2019-10-13 17:44:01,638 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:01,638 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2132371161] [2019-10-13 17:44:01,638 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:01,638 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:01,638 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:01,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:02,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:02,047 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 248 trivial. 0 not checked. [2019-10-13 17:44:02,048 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2132371161] [2019-10-13 17:44:02,048 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1768555166] [2019-10-13 17:44:02,048 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:02,773 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 29 check-sat command(s) [2019-10-13 17:44:02,774 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:02,777 INFO L256 TraceCheckSpWp]: Trace formula consists of 286 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-13 17:44:02,778 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:03,059 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 1 proven. 247 refuted. 0 times theorem prover too weak. 841 trivial. 0 not checked. [2019-10-13 17:44:03,060 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:03,060 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 16] total 47 [2019-10-13 17:44:03,060 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019116038] [2019-10-13 17:44:03,061 INFO L442 AbstractCegarLoop]: Interpolant automaton has 47 states [2019-10-13 17:44:03,061 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:03,061 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2019-10-13 17:44:03,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-10-13 17:44:03,062 INFO L87 Difference]: Start difference. First operand 159 states and 189 transitions. Second operand 47 states. [2019-10-13 17:44:03,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:03,330 INFO L93 Difference]: Finished difference Result 266 states and 332 transitions. [2019-10-13 17:44:03,330 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2019-10-13 17:44:03,330 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 115 [2019-10-13 17:44:03,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:03,332 INFO L225 Difference]: With dead ends: 266 [2019-10-13 17:44:03,332 INFO L226 Difference]: Without dead ends: 172 [2019-10-13 17:44:03,334 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 148 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 435 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=617, Invalid=1545, Unknown=0, NotChecked=0, Total=2162 [2019-10-13 17:44:03,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-10-13 17:44:03,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 167. [2019-10-13 17:44:03,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 167 states. [2019-10-13 17:44:03,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 199 transitions. [2019-10-13 17:44:03,339 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 199 transitions. Word has length 115 [2019-10-13 17:44:03,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:03,340 INFO L462 AbstractCegarLoop]: Abstraction has 167 states and 199 transitions. [2019-10-13 17:44:03,340 INFO L463 AbstractCegarLoop]: Interpolant automaton has 47 states. [2019-10-13 17:44:03,340 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 199 transitions. [2019-10-13 17:44:03,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2019-10-13 17:44:03,341 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:03,341 INFO L380 BasicCegarLoop]: trace histogram [30, 30, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:03,546 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:03,547 INFO L410 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:03,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:03,548 INFO L82 PathProgramCache]: Analyzing trace with hash -1764460921, now seen corresponding path program 30 times [2019-10-13 17:44:03,548 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:03,548 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144127949] [2019-10-13 17:44:03,548 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:03,549 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:03,549 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:03,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:04,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:04,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:04,195 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144127949] [2019-10-13 17:44:04,195 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288666790] [2019-10-13 17:44:04,196 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:07,594 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 31 check-sat command(s) [2019-10-13 17:44:07,594 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:07,600 INFO L256 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-13 17:44:07,604 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:07,672 INFO L134 CoverageAnalysis]: Checked inductivity of 1188 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:07,673 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:07,673 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 33] total 35 [2019-10-13 17:44:07,673 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1770125099] [2019-10-13 17:44:07,674 INFO L442 AbstractCegarLoop]: Interpolant automaton has 35 states [2019-10-13 17:44:07,674 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:07,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2019-10-13 17:44:07,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 17:44:07,675 INFO L87 Difference]: Start difference. First operand 167 states and 199 transitions. Second operand 35 states. [2019-10-13 17:44:07,937 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:07,937 INFO L93 Difference]: Finished difference Result 270 states and 334 transitions. [2019-10-13 17:44:07,938 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-13 17:44:07,938 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 120 [2019-10-13 17:44:07,938 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:07,939 INFO L225 Difference]: With dead ends: 270 [2019-10-13 17:44:07,940 INFO L226 Difference]: Without dead ends: 170 [2019-10-13 17:44:07,941 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 154 GetRequests, 121 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 88 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2019-10-13 17:44:07,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2019-10-13 17:44:07,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 169. [2019-10-13 17:44:07,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 169 states. [2019-10-13 17:44:07,948 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 169 states to 169 states and 201 transitions. [2019-10-13 17:44:07,948 INFO L78 Accepts]: Start accepts. Automaton has 169 states and 201 transitions. Word has length 120 [2019-10-13 17:44:07,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:07,948 INFO L462 AbstractCegarLoop]: Abstraction has 169 states and 201 transitions. [2019-10-13 17:44:07,948 INFO L463 AbstractCegarLoop]: Interpolant automaton has 35 states. [2019-10-13 17:44:07,948 INFO L276 IsEmpty]: Start isEmpty. Operand 169 states and 201 transitions. [2019-10-13 17:44:07,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2019-10-13 17:44:07,949 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:07,950 INFO L380 BasicCegarLoop]: trace histogram [31, 31, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:08,158 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:08,158 INFO L410 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:08,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:08,159 INFO L82 PathProgramCache]: Analyzing trace with hash 1896499625, now seen corresponding path program 31 times [2019-10-13 17:44:08,159 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:08,160 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2146989050] [2019-10-13 17:44:08,160 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:08,160 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:08,160 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:08,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:08,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:08,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:08,910 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2146989050] [2019-10-13 17:44:08,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [104462456] [2019-10-13 17:44:08,911 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 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:09,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:09,015 INFO L256 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2019-10-13 17:44:09,017 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:09,041 INFO L134 CoverageAnalysis]: Checked inductivity of 1249 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:09,041 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:09,041 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 34] total 36 [2019-10-13 17:44:09,042 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228014647] [2019-10-13 17:44:09,042 INFO L442 AbstractCegarLoop]: Interpolant automaton has 36 states [2019-10-13 17:44:09,042 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:09,042 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2019-10-13 17:44:09,043 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:44:09,043 INFO L87 Difference]: Start difference. First operand 169 states and 201 transitions. Second operand 36 states. [2019-10-13 17:44:09,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:09,324 INFO L93 Difference]: Finished difference Result 272 states and 336 transitions. [2019-10-13 17:44:09,325 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2019-10-13 17:44:09,325 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 122 [2019-10-13 17:44:09,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:09,326 INFO L225 Difference]: With dead ends: 272 [2019-10-13 17:44:09,326 INFO L226 Difference]: Without dead ends: 172 [2019-10-13 17:44:09,327 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2019-10-13 17:44:09,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2019-10-13 17:44:09,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 171. [2019-10-13 17:44:09,332 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 171 states. [2019-10-13 17:44:09,333 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 203 transitions. [2019-10-13 17:44:09,333 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 203 transitions. Word has length 122 [2019-10-13 17:44:09,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:09,333 INFO L462 AbstractCegarLoop]: Abstraction has 171 states and 203 transitions. [2019-10-13 17:44:09,333 INFO L463 AbstractCegarLoop]: Interpolant automaton has 36 states. [2019-10-13 17:44:09,334 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 203 transitions. [2019-10-13 17:44:09,334 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2019-10-13 17:44:09,334 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:09,335 INFO L380 BasicCegarLoop]: trace histogram [32, 32, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:09,538 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:09,538 INFO L410 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:09,538 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:09,538 INFO L82 PathProgramCache]: Analyzing trace with hash -1793598389, now seen corresponding path program 32 times [2019-10-13 17:44:09,539 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:09,539 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1711435482] [2019-10-13 17:44:09,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:09,539 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:09,539 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:10,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:10,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:10,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1711435482] [2019-10-13 17:44:10,087 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1186143957] [2019-10-13 17:44:10,087 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 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:10,190 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-13 17:44:10,190 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:10,192 INFO L256 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-13 17:44:10,193 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:10,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1312 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:10,223 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:10,224 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 35] total 37 [2019-10-13 17:44:10,224 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [98410278] [2019-10-13 17:44:10,225 INFO L442 AbstractCegarLoop]: Interpolant automaton has 37 states [2019-10-13 17:44:10,226 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:10,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2019-10-13 17:44:10,227 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 17:44:10,227 INFO L87 Difference]: Start difference. First operand 171 states and 203 transitions. Second operand 37 states. [2019-10-13 17:44:10,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:10,469 INFO L93 Difference]: Finished difference Result 274 states and 338 transitions. [2019-10-13 17:44:10,470 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2019-10-13 17:44:10,470 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 124 [2019-10-13 17:44:10,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:10,472 INFO L225 Difference]: With dead ends: 274 [2019-10-13 17:44:10,472 INFO L226 Difference]: Without dead ends: 174 [2019-10-13 17:44:10,473 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 125 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2019-10-13 17:44:10,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 174 states. [2019-10-13 17:44:10,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 174 to 173. [2019-10-13 17:44:10,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 173 states. [2019-10-13 17:44:10,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 205 transitions. [2019-10-13 17:44:10,480 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 205 transitions. Word has length 124 [2019-10-13 17:44:10,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:10,481 INFO L462 AbstractCegarLoop]: Abstraction has 173 states and 205 transitions. [2019-10-13 17:44:10,481 INFO L463 AbstractCegarLoop]: Interpolant automaton has 37 states. [2019-10-13 17:44:10,481 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 205 transitions. [2019-10-13 17:44:10,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2019-10-13 17:44:10,482 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:10,482 INFO L380 BasicCegarLoop]: trace histogram [33, 33, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:10,687 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:10,687 INFO L410 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:10,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:10,687 INFO L82 PathProgramCache]: Analyzing trace with hash -334803347, now seen corresponding path program 33 times [2019-10-13 17:44:10,687 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:10,688 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448001761] [2019-10-13 17:44:10,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:10,688 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:10,688 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:10,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:11,241 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:11,251 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-13 17:44:11,251 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448001761] [2019-10-13 17:44:11,252 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [296829180] [2019-10-13 17:44:11,252 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 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:11,544 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 16 check-sat command(s) [2019-10-13 17:44:11,544 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:11,546 INFO L256 TraceCheckSpWp]: Trace formula consists of 269 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-13 17:44:11,549 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:11,883 INFO L134 CoverageAnalysis]: Checked inductivity of 1377 backedges. 1 proven. 287 refuted. 0 times theorem prover too weak. 1089 trivial. 0 not checked. [2019-10-13 17:44:11,884 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:11,884 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37, 17] total 52 [2019-10-13 17:44:11,884 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2057277550] [2019-10-13 17:44:11,884 INFO L442 AbstractCegarLoop]: Interpolant automaton has 52 states [2019-10-13 17:44:11,884 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:11,885 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2019-10-13 17:44:11,885 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-10-13 17:44:11,885 INFO L87 Difference]: Start difference. First operand 173 states and 205 transitions. Second operand 52 states. [2019-10-13 17:44:12,379 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:12,380 INFO L93 Difference]: Finished difference Result 286 states and 356 transitions. [2019-10-13 17:44:12,380 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2019-10-13 17:44:12,380 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 126 [2019-10-13 17:44:12,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:12,381 INFO L225 Difference]: With dead ends: 286 [2019-10-13 17:44:12,381 INFO L226 Difference]: Without dead ends: 186 [2019-10-13 17:44:12,382 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 113 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 528 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=767, Invalid=1885, Unknown=0, NotChecked=0, Total=2652 [2019-10-13 17:44:12,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 186 states. [2019-10-13 17:44:12,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 186 to 181. [2019-10-13 17:44:12,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 181 states. [2019-10-13 17:44:12,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 215 transitions. [2019-10-13 17:44:12,387 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 215 transitions. Word has length 126 [2019-10-13 17:44:12,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:12,387 INFO L462 AbstractCegarLoop]: Abstraction has 181 states and 215 transitions. [2019-10-13 17:44:12,387 INFO L463 AbstractCegarLoop]: Interpolant automaton has 52 states. [2019-10-13 17:44:12,387 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 215 transitions. [2019-10-13 17:44:12,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2019-10-13 17:44:12,388 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:12,388 INFO L380 BasicCegarLoop]: trace histogram [34, 34, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:12,588 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:12,589 INFO L410 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:12,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:12,589 INFO L82 PathProgramCache]: Analyzing trace with hash 912852824, now seen corresponding path program 34 times [2019-10-13 17:44:12,590 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:12,590 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1491500675] [2019-10-13 17:44:12,590 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:12,591 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:12,591 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:12,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:13,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:13,319 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-10-13 17:44:13,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1491500675] [2019-10-13 17:44:13,319 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219568038] [2019-10-13 17:44:13,319 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 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:13,426 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-13 17:44:13,426 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-13 17:44:13,428 INFO L256 TraceCheckSpWp]: Trace formula consists of 391 conjuncts, 36 conjunts are in the unsatisfiable core [2019-10-13 17:44:13,429 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-13 17:44:13,467 INFO L134 CoverageAnalysis]: Checked inductivity of 1487 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-10-13 17:44:13,467 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-13 17:44:13,468 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 37] total 39 [2019-10-13 17:44:13,468 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377310379] [2019-10-13 17:44:13,468 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-13 17:44:13,468 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-13 17:44:13,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-13 17:44:13,469 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-10-13 17:44:13,469 INFO L87 Difference]: Start difference. First operand 181 states and 215 transitions. Second operand 39 states. [2019-10-13 17:44:13,742 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-13 17:44:13,742 INFO L93 Difference]: Finished difference Result 290 states and 358 transitions. [2019-10-13 17:44:13,743 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-13 17:44:13,743 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 131 [2019-10-13 17:44:13,743 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-13 17:44:13,745 INFO L225 Difference]: With dead ends: 290 [2019-10-13 17:44:13,745 INFO L226 Difference]: Without dead ends: 184 [2019-10-13 17:44:13,747 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 100 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2019-10-13 17:44:13,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2019-10-13 17:44:13,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 183. [2019-10-13 17:44:13,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 183 states. [2019-10-13 17:44:13,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 183 states to 183 states and 217 transitions. [2019-10-13 17:44:13,752 INFO L78 Accepts]: Start accepts. Automaton has 183 states and 217 transitions. Word has length 131 [2019-10-13 17:44:13,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-13 17:44:13,752 INFO L462 AbstractCegarLoop]: Abstraction has 183 states and 217 transitions. [2019-10-13 17:44:13,753 INFO L463 AbstractCegarLoop]: Interpolant automaton has 39 states. [2019-10-13 17:44:13,753 INFO L276 IsEmpty]: Start isEmpty. Operand 183 states and 217 transitions. [2019-10-13 17:44:13,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2019-10-13 17:44:13,754 INFO L372 BasicCegarLoop]: Found error trace [2019-10-13 17:44:13,754 INFO L380 BasicCegarLoop]: trace histogram [35, 35, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-13 17:44:13,957 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-13 17:44:13,958 INFO L410 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-13 17:44:13,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-13 17:44:13,958 INFO L82 PathProgramCache]: Analyzing trace with hash -906409226, now seen corresponding path program 35 times [2019-10-13 17:44:13,958 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-13 17:44:13,958 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [785519399] [2019-10-13 17:44:13,958 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,958 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-13 17:44:13,958 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-13 17:44:13,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:14,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-13 17:44:14,608 INFO L134 CoverageAnalysis]: Checked inductivity of 1556 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 331 trivial. 0 not checked. [2019-10-13 17:44:14,609 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [785519399] [2019-10-13 17:44:14,609 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1216245717] [2019-10-13 17:44:14,609 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 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 -smt2 -in SMTLIB2_COMPLIANT=true