/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-examples/standard_init2_ground-1.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-fb55353 [2019-11-06 18:43:36,933 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-11-06 18:43:36,936 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-11-06 18:43:36,955 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-11-06 18:43:36,955 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-11-06 18:43:36,957 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-11-06 18:43:36,959 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-11-06 18:43:36,969 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-11-06 18:43:36,973 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-11-06 18:43:36,976 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-11-06 18:43:36,978 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-11-06 18:43:36,980 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-11-06 18:43:36,980 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-11-06 18:43:36,982 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-11-06 18:43:36,984 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-11-06 18:43:36,986 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-11-06 18:43:36,988 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-11-06 18:43:36,989 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-11-06 18:43:36,990 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-11-06 18:43:36,995 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-11-06 18:43:36,999 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-11-06 18:43:37,002 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-11-06 18:43:37,004 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-11-06 18:43:37,005 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-11-06 18:43:37,007 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-11-06 18:43:37,012 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-11-06 18:43:37,014 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-11-06 18:43:37,015 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-11-06 18:43:37,015 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-11-06 18:43:37,017 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-11-06 18:43:37,017 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-11-06 18:43:37,018 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-11-06 18:43:37,018 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-11-06 18:43:37,018 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-11-06 18:43:37,019 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-11-06 18:43:37,020 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-11-06 18:43:37,021 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-11-06 18:43:37,049 INFO L113 SettingsManager]: Loading preferences was successful [2019-11-06 18:43:37,050 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-11-06 18:43:37,051 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-11-06 18:43:37,051 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-11-06 18:43:37,051 INFO L138 SettingsManager]: * Use SBE=true [2019-11-06 18:43:37,051 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-11-06 18:43:37,052 INFO L138 SettingsManager]: * sizeof long=4 [2019-11-06 18:43:37,055 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-11-06 18:43:37,055 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-11-06 18:43:37,056 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-11-06 18:43:37,057 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-11-06 18:43:37,057 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-11-06 18:43:37,057 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-11-06 18:43:37,058 INFO L138 SettingsManager]: * sizeof long double=12 [2019-11-06 18:43:37,058 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-11-06 18:43:37,058 INFO L138 SettingsManager]: * Use constant arrays=true [2019-11-06 18:43:37,058 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-11-06 18:43:37,058 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-11-06 18:43:37,059 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-11-06 18:43:37,059 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-11-06 18:43:37,060 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-11-06 18:43:37,060 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:43:37,060 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-11-06 18:43:37,060 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-11-06 18:43:37,061 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-11-06 18:43:37,061 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-11-06 18:43:37,061 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-11-06 18:43:37,061 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-11-06 18:43:37,061 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-11-06 18:43:37,333 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-11-06 18:43:37,353 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-11-06 18:43:37,358 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-11-06 18:43:37,360 INFO L271 PluginConnector]: Initializing CDTParser... [2019-11-06 18:43:37,360 INFO L275 PluginConnector]: CDTParser initialized [2019-11-06 18:43:37,361 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_init2_ground-1.i [2019-11-06 18:43:37,437 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee427910a/8fea8e66d1a44b27ae7c1a8e4164e40c/FLAGcf1e58456 [2019-11-06 18:43:37,883 INFO L306 CDTParser]: Found 1 translation units. [2019-11-06 18:43:37,884 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_init2_ground-1.i [2019-11-06 18:43:37,889 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee427910a/8fea8e66d1a44b27ae7c1a8e4164e40c/FLAGcf1e58456 [2019-11-06 18:43:38,326 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ee427910a/8fea8e66d1a44b27ae7c1a8e4164e40c [2019-11-06 18:43:38,334 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-11-06 18:43:38,335 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-11-06 18:43:38,336 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:38,337 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-11-06 18:43:38,340 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-11-06 18:43:38,341 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,344 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@35cd8d39 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38, skipping insertion in model container [2019-11-06 18:43:38,344 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,352 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-11-06 18:43:38,372 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-11-06 18:43:38,585 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:38,589 INFO L188 MainTranslator]: Completed pre-run [2019-11-06 18:43:38,607 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-11-06 18:43:38,623 INFO L192 MainTranslator]: Completed translation [2019-11-06 18:43:38,623 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38 WrapperNode [2019-11-06 18:43:38,623 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-11-06 18:43:38,624 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-11-06 18:43:38,624 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-11-06 18:43:38,624 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-11-06 18:43:38,716 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,716 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,722 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,722 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,728 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,733 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,735 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... [2019-11-06 18:43:38,736 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-11-06 18:43:38,737 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-11-06 18:43:38,737 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-11-06 18:43:38,737 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-11-06 18:43:38,738 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-11-06 18:43:38,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-11-06 18:43:38,796 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-11-06 18:43:38,796 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-11-06 18:43:38,796 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-11-06 18:43:38,796 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-11-06 18:43:38,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-11-06 18:43:38,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-11-06 18:43:39,017 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-11-06 18:43:39,018 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-11-06 18:43:39,021 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:39 BoogieIcfgContainer [2019-11-06 18:43:39,021 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-11-06 18:43:39,029 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-11-06 18:43:39,030 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-11-06 18:43:39,035 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-11-06 18:43:39,035 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 06:43:38" (1/3) ... [2019-11-06 18:43:39,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@773eb747 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:39, skipping insertion in model container [2019-11-06 18:43:39,041 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 06:43:38" (2/3) ... [2019-11-06 18:43:39,041 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@773eb747 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 06:43:39, skipping insertion in model container [2019-11-06 18:43:39,042 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 06:43:39" (3/3) ... [2019-11-06 18:43:39,047 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_init2_ground-1.i [2019-11-06 18:43:39,068 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-11-06 18:43:39,082 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-11-06 18:43:39,093 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-11-06 18:43:39,115 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-11-06 18:43:39,116 INFO L374 AbstractCegarLoop]: Hoare is true [2019-11-06 18:43:39,116 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-11-06 18:43:39,116 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-11-06 18:43:39,116 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-11-06 18:43:39,116 INFO L378 AbstractCegarLoop]: Difference is false [2019-11-06 18:43:39,116 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-11-06 18:43:39,116 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-11-06 18:43:39,133 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states. [2019-11-06 18:43:39,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:43:39,138 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:39,139 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:39,141 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:39,145 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:39,145 INFO L82 PathProgramCache]: Analyzing trace with hash 2104113866, now seen corresponding path program 1 times [2019-11-06 18:43:39,152 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:39,152 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305082496] [2019-11-06 18:43:39,153 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:39,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,326 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:39,326 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305082496] [2019-11-06 18:43:39,327 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:39,328 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-11-06 18:43:39,328 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926910084] [2019-11-06 18:43:39,335 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-11-06 18:43:39,336 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:39,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-11-06 18:43:39,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:39,348 INFO L87 Difference]: Start difference. First operand 25 states. Second operand 3 states. [2019-11-06 18:43:39,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:39,440 INFO L93 Difference]: Finished difference Result 43 states and 54 transitions. [2019-11-06 18:43:39,441 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-11-06 18:43:39,442 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 15 [2019-11-06 18:43:39,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:39,450 INFO L225 Difference]: With dead ends: 43 [2019-11-06 18:43:39,450 INFO L226 Difference]: Without dead ends: 20 [2019-11-06 18:43:39,453 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-11-06 18:43:39,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2019-11-06 18:43:39,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2019-11-06 18:43:39,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2019-11-06 18:43:39,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2019-11-06 18:43:39,485 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 15 [2019-11-06 18:43:39,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:39,486 INFO L462 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2019-11-06 18:43:39,486 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-11-06 18:43:39,486 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2019-11-06 18:43:39,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-11-06 18:43:39,487 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:39,487 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:39,488 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:39,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:39,488 INFO L82 PathProgramCache]: Analyzing trace with hash 743997126, now seen corresponding path program 1 times [2019-11-06 18:43:39,489 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:39,489 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [996732102] [2019-11-06 18:43:39,489 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:39,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,555 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-11-06 18:43:39,556 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [996732102] [2019-11-06 18:43:39,556 INFO L218 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-11-06 18:43:39,557 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-11-06 18:43:39,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165228736] [2019-11-06 18:43:39,559 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-11-06 18:43:39,559 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:39,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-11-06 18:43:39,560 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:39,560 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 4 states. [2019-11-06 18:43:39,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:39,633 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2019-11-06 18:43:39,634 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-11-06 18:43:39,634 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-11-06 18:43:39,634 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:39,635 INFO L225 Difference]: With dead ends: 35 [2019-11-06 18:43:39,635 INFO L226 Difference]: Without dead ends: 22 [2019-11-06 18:43:39,636 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-11-06 18:43:39,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2019-11-06 18:43:39,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2019-11-06 18:43:39,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-11-06 18:43:39,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-11-06 18:43:39,644 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-11-06 18:43:39,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:39,644 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-11-06 18:43:39,645 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-11-06 18:43:39,645 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-11-06 18:43:39,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-11-06 18:43:39,646 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:39,646 INFO L410 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:39,646 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:39,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:39,647 INFO L82 PathProgramCache]: Analyzing trace with hash 494025381, now seen corresponding path program 1 times [2019-11-06 18:43:39,647 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:39,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75772976] [2019-11-06 18:43:39,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:39,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,753 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,764 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:43:39,764 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75772976] [2019-11-06 18:43:39,765 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411526034] [2019-11-06 18:43:39,767 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:39,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:39,834 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-11-06 18:43:39,840 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:39,871 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2019-11-06 18:43:39,872 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:39,872 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-11-06 18:43:39,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [451840069] [2019-11-06 18:43:39,873 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-11-06 18:43:39,873 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:39,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-11-06 18:43:39,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:39,874 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2019-11-06 18:43:39,967 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:39,968 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2019-11-06 18:43:39,968 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-11-06 18:43:39,969 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-11-06 18:43:39,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:39,971 INFO L225 Difference]: With dead ends: 38 [2019-11-06 18:43:39,972 INFO L226 Difference]: Without dead ends: 24 [2019-11-06 18:43:39,972 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-11-06 18:43:39,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-11-06 18:43:39,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-11-06 18:43:39,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-11-06 18:43:39,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-11-06 18:43:39,984 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-11-06 18:43:39,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:39,984 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-11-06 18:43:39,985 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-11-06 18:43:39,986 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-11-06 18:43:39,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-11-06 18:43:39,989 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:39,989 INFO L410 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:40,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,198 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:40,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:40,199 INFO L82 PathProgramCache]: Analyzing trace with hash -254426330, now seen corresponding path program 2 times [2019-11-06 18:43:40,199 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:40,199 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1750540856] [2019-11-06 18:43:40,199 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:40,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,283 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:40,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1750540856] [2019-11-06 18:43:40,284 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [612836186] [2019-11-06 18:43:40,284 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,338 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:40,338 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:40,339 INFO L256 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 4 conjunts are in the unsatisfiable core [2019-11-06 18:43:40,341 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:40,358 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2019-11-06 18:43:40,368 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:40,368 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-11-06 18:43:40,369 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [225680712] [2019-11-06 18:43:40,369 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-11-06 18:43:40,369 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:40,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-11-06 18:43:40,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:40,370 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 7 states. [2019-11-06 18:43:40,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:40,464 INFO L93 Difference]: Finished difference Result 41 states and 46 transitions. [2019-11-06 18:43:40,464 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-11-06 18:43:40,465 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 19 [2019-11-06 18:43:40,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:40,466 INFO L225 Difference]: With dead ends: 41 [2019-11-06 18:43:40,466 INFO L226 Difference]: Without dead ends: 26 [2019-11-06 18:43:40,466 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-11-06 18:43:40,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-11-06 18:43:40,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-11-06 18:43:40,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-11-06 18:43:40,472 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-11-06 18:43:40,472 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2019-11-06 18:43:40,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:40,473 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-11-06 18:43:40,473 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-11-06 18:43:40,473 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-11-06 18:43:40,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-11-06 18:43:40,474 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:40,474 INFO L410 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:40,675 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,675 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:40,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:40,676 INFO L82 PathProgramCache]: Analyzing trace with hash -254217403, now seen corresponding path program 3 times [2019-11-06 18:43:40,676 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:40,677 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1335281775] [2019-11-06 18:43:40,677 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:40,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:40,772 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:43:40,774 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1335281775] [2019-11-06 18:43:40,774 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85417438] [2019-11-06 18:43:40,775 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:40,828 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-11-06 18:43:40,828 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:40,829 INFO L256 TraceCheckSpWp]: Trace formula consists of 79 conjuncts, 5 conjunts are in the unsatisfiable core [2019-11-06 18:43:40,832 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:40,846 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-11-06 18:43:40,846 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:40,846 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-11-06 18:43:40,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [237961574] [2019-11-06 18:43:40,849 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-11-06 18:43:40,849 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:40,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-11-06 18:43:40,850 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:40,850 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2019-11-06 18:43:40,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:40,923 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2019-11-06 18:43:40,923 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-11-06 18:43:40,923 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2019-11-06 18:43:40,924 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:40,924 INFO L225 Difference]: With dead ends: 44 [2019-11-06 18:43:40,924 INFO L226 Difference]: Without dead ends: 28 [2019-11-06 18:43:40,925 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-11-06 18:43:40,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2019-11-06 18:43:40,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2019-11-06 18:43:40,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-11-06 18:43:40,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-11-06 18:43:40,931 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2019-11-06 18:43:40,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:40,931 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-11-06 18:43:40,931 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-11-06 18:43:40,931 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-11-06 18:43:40,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-11-06 18:43:40,932 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:40,932 INFO L410 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:41,141 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,141 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:41,141 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:41,142 INFO L82 PathProgramCache]: Analyzing trace with hash 1902727046, now seen corresponding path program 4 times [2019-11-06 18:43:41,142 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:41,142 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [974590078] [2019-11-06 18:43:41,143 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:41,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,233 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:43:41,234 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [974590078] [2019-11-06 18:43:41,234 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [659310259] [2019-11-06 18:43:41,234 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,286 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:41,286 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:41,288 INFO L256 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 6 conjunts are in the unsatisfiable core [2019-11-06 18:43:41,289 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:41,316 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2019-11-06 18:43:41,316 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:41,316 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-11-06 18:43:41,317 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [802315489] [2019-11-06 18:43:41,317 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-11-06 18:43:41,317 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:41,318 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-11-06 18:43:41,318 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:41,318 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 9 states. [2019-11-06 18:43:41,433 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:41,434 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2019-11-06 18:43:41,434 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-11-06 18:43:41,434 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 23 [2019-11-06 18:43:41,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:41,435 INFO L225 Difference]: With dead ends: 47 [2019-11-06 18:43:41,435 INFO L226 Difference]: Without dead ends: 30 [2019-11-06 18:43:41,436 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-11-06 18:43:41,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2019-11-06 18:43:41,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2019-11-06 18:43:41,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-11-06 18:43:41,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-11-06 18:43:41,441 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-11-06 18:43:41,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:41,442 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-11-06 18:43:41,442 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-11-06 18:43:41,442 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-11-06 18:43:41,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-11-06 18:43:41,443 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:41,443 INFO L410 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:41,646 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,646 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:41,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:41,647 INFO L82 PathProgramCache]: Analyzing trace with hash 768730085, now seen corresponding path program 5 times [2019-11-06 18:43:41,647 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:41,648 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1530282126] [2019-11-06 18:43:41,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:41,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:41,775 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:43:41,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1530282126] [2019-11-06 18:43:41,775 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099940914] [2019-11-06 18:43:41,782 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:41,873 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2019-11-06 18:43:41,873 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:41,874 INFO L256 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 7 conjunts are in the unsatisfiable core [2019-11-06 18:43:41,878 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:41,897 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2019-11-06 18:43:41,898 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:41,898 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-11-06 18:43:41,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1975090209] [2019-11-06 18:43:41,900 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-11-06 18:43:41,900 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:41,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-11-06 18:43:41,901 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:41,902 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 10 states. [2019-11-06 18:43:41,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:41,998 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2019-11-06 18:43:41,998 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-11-06 18:43:41,998 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 25 [2019-11-06 18:43:41,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:41,999 INFO L225 Difference]: With dead ends: 50 [2019-11-06 18:43:42,000 INFO L226 Difference]: Without dead ends: 32 [2019-11-06 18:43:42,000 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-11-06 18:43:42,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2019-11-06 18:43:42,005 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2019-11-06 18:43:42,005 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-11-06 18:43:42,006 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2019-11-06 18:43:42,007 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 25 [2019-11-06 18:43:42,007 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:42,007 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2019-11-06 18:43:42,007 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-11-06 18:43:42,007 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2019-11-06 18:43:42,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-11-06 18:43:42,008 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:42,008 INFO L410 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:42,212 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,215 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:42,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:42,216 INFO L82 PathProgramCache]: Analyzing trace with hash 598811622, now seen corresponding path program 6 times [2019-11-06 18:43:42,216 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:42,216 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478513127] [2019-11-06 18:43:42,217 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:42,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,315 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:43:42,315 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478513127] [2019-11-06 18:43:42,315 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636142934] [2019-11-06 18:43:42,316 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,394 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2019-11-06 18:43:42,394 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:42,396 INFO L256 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 8 conjunts are in the unsatisfiable core [2019-11-06 18:43:42,397 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:42,420 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2019-11-06 18:43:42,420 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:42,420 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-11-06 18:43:42,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [987881141] [2019-11-06 18:43:42,421 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-11-06 18:43:42,421 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:42,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-11-06 18:43:42,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:42,422 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 11 states. [2019-11-06 18:43:42,507 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:42,507 INFO L93 Difference]: Finished difference Result 53 states and 58 transitions. [2019-11-06 18:43:42,508 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-11-06 18:43:42,508 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 27 [2019-11-06 18:43:42,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:42,509 INFO L225 Difference]: With dead ends: 53 [2019-11-06 18:43:42,509 INFO L226 Difference]: Without dead ends: 34 [2019-11-06 18:43:42,510 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-11-06 18:43:42,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-11-06 18:43:42,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2019-11-06 18:43:42,514 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2019-11-06 18:43:42,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2019-11-06 18:43:42,515 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 27 [2019-11-06 18:43:42,515 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:42,515 INFO L462 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2019-11-06 18:43:42,515 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-11-06 18:43:42,515 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2019-11-06 18:43:42,516 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2019-11-06 18:43:42,516 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:42,516 INFO L410 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:42,720 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,721 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:42,722 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:42,722 INFO L82 PathProgramCache]: Analyzing trace with hash -1765864315, now seen corresponding path program 7 times [2019-11-06 18:43:42,722 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:42,723 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2144118684] [2019-11-06 18:43:42,723 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:42,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,838 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:43:42,839 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2144118684] [2019-11-06 18:43:42,839 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000550762] [2019-11-06 18:43:42,839 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:42,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:42,890 INFO L256 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 9 conjunts are in the unsatisfiable core [2019-11-06 18:43:42,893 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:42,911 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-11-06 18:43:42,911 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:42,911 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-11-06 18:43:42,912 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [391994688] [2019-11-06 18:43:42,912 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-11-06 18:43:42,912 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:42,913 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-11-06 18:43:42,913 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:42,913 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 12 states. [2019-11-06 18:43:43,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:43,009 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2019-11-06 18:43:43,010 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-11-06 18:43:43,010 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 29 [2019-11-06 18:43:43,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:43,010 INFO L225 Difference]: With dead ends: 56 [2019-11-06 18:43:43,011 INFO L226 Difference]: Without dead ends: 36 [2019-11-06 18:43:43,011 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-11-06 18:43:43,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2019-11-06 18:43:43,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2019-11-06 18:43:43,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2019-11-06 18:43:43,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2019-11-06 18:43:43,017 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 29 [2019-11-06 18:43:43,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:43,017 INFO L462 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2019-11-06 18:43:43,017 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-11-06 18:43:43,017 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2019-11-06 18:43:43,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2019-11-06 18:43:43,018 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:43,018 INFO L410 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:43,228 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:43,229 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:43,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:43,229 INFO L82 PathProgramCache]: Analyzing trace with hash 97206342, now seen corresponding path program 8 times [2019-11-06 18:43:43,230 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:43,230 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251829976] [2019-11-06 18:43:43,230 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:43,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,357 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:43:43,358 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251829976] [2019-11-06 18:43:43,358 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [45554235] [2019-11-06 18:43:43,358 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:43,405 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:43,405 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:43,406 INFO L256 TraceCheckSpWp]: Trace formula consists of 119 conjuncts, 10 conjunts are in the unsatisfiable core [2019-11-06 18:43:43,408 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:43,428 INFO L134 CoverageAnalysis]: Checked inductivity of 72 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:43:43,429 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:43,429 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-11-06 18:43:43,429 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365096534] [2019-11-06 18:43:43,430 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-11-06 18:43:43,431 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:43,432 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-11-06 18:43:43,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:43,432 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 13 states. [2019-11-06 18:43:43,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:43,543 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2019-11-06 18:43:43,543 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-11-06 18:43:43,543 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 31 [2019-11-06 18:43:43,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:43,544 INFO L225 Difference]: With dead ends: 59 [2019-11-06 18:43:43,544 INFO L226 Difference]: Without dead ends: 38 [2019-11-06 18:43:43,545 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-11-06 18:43:43,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2019-11-06 18:43:43,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2019-11-06 18:43:43,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-11-06 18:43:43,550 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-11-06 18:43:43,550 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 31 [2019-11-06 18:43:43,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:43,551 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-11-06 18:43:43,551 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-11-06 18:43:43,551 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-11-06 18:43:43,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2019-11-06 18:43:43,552 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:43,552 INFO L410 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:43,755 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:43,756 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:43,756 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:43,756 INFO L82 PathProgramCache]: Analyzing trace with hash 1434610981, now seen corresponding path program 9 times [2019-11-06 18:43:43,757 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:43,757 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1996861637] [2019-11-06 18:43:43,757 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:43,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:43,884 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2019-11-06 18:43:43,885 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1996861637] [2019-11-06 18:43:43,885 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1026470129] [2019-11-06 18:43:43,885 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:43,979 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-11-06 18:43:43,979 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:43,981 INFO L256 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:43:43,983 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:44,013 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 9 proven. 45 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-11-06 18:43:44,013 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:44,014 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2019-11-06 18:43:44,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489847641] [2019-11-06 18:43:44,015 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:44,015 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:44,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:44,015 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:44,016 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2019-11-06 18:43:44,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:44,126 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2019-11-06 18:43:44,126 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:44,126 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 33 [2019-11-06 18:43:44,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:44,127 INFO L225 Difference]: With dead ends: 62 [2019-11-06 18:43:44,128 INFO L226 Difference]: Without dead ends: 40 [2019-11-06 18:43:44,129 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:44,129 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2019-11-06 18:43:44,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2019-11-06 18:43:44,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-11-06 18:43:44,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-11-06 18:43:44,135 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 33 [2019-11-06 18:43:44,135 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:44,135 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-11-06 18:43:44,135 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:44,135 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-11-06 18:43:44,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-11-06 18:43:44,136 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:44,136 INFO L410 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:44,339 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:44,340 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:44,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:44,341 INFO L82 PathProgramCache]: Analyzing trace with hash 2119541926, now seen corresponding path program 10 times [2019-11-06 18:43:44,341 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:44,341 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43658376] [2019-11-06 18:43:44,342 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:44,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:44,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:44,465 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:43:44,465 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43658376] [2019-11-06 18:43:44,466 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [339597646] [2019-11-06 18:43:44,466 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:44,541 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:44,542 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:44,543 INFO L256 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2019-11-06 18:43:44,544 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:44,561 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2019-11-06 18:43:44,562 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:44,562 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-11-06 18:43:44,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782203850] [2019-11-06 18:43:44,563 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-11-06 18:43:44,563 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:44,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-11-06 18:43:44,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:44,564 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 15 states. [2019-11-06 18:43:44,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:44,675 INFO L93 Difference]: Finished difference Result 65 states and 70 transitions. [2019-11-06 18:43:44,676 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-11-06 18:43:44,676 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 35 [2019-11-06 18:43:44,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:44,677 INFO L225 Difference]: With dead ends: 65 [2019-11-06 18:43:44,677 INFO L226 Difference]: Without dead ends: 42 [2019-11-06 18:43:44,677 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-11-06 18:43:44,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2019-11-06 18:43:44,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2019-11-06 18:43:44,683 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-11-06 18:43:44,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2019-11-06 18:43:44,686 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 35 [2019-11-06 18:43:44,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:44,687 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2019-11-06 18:43:44,687 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-11-06 18:43:44,687 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2019-11-06 18:43:44,690 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-11-06 18:43:44,690 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:44,690 INFO L410 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:44,893 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:44,894 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:44,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:44,894 INFO L82 PathProgramCache]: Analyzing trace with hash 461243845, now seen corresponding path program 11 times [2019-11-06 18:43:44,894 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:44,894 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [587064833] [2019-11-06 18:43:44,894 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:44,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:45,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:45,039 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:43:45,039 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [587064833] [2019-11-06 18:43:45,040 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [714066994] [2019-11-06 18:43:45,040 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:45,687 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 7 check-sat command(s) [2019-11-06 18:43:45,687 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:45,690 INFO L256 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 13 conjunts are in the unsatisfiable core [2019-11-06 18:43:45,692 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:45,720 INFO L134 CoverageAnalysis]: Checked inductivity of 132 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-11-06 18:43:45,720 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:45,720 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-11-06 18:43:45,721 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379025827] [2019-11-06 18:43:45,721 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-11-06 18:43:45,721 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:45,721 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-11-06 18:43:45,722 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:45,722 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 16 states. [2019-11-06 18:43:45,844 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:45,844 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2019-11-06 18:43:45,845 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-11-06 18:43:45,845 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 37 [2019-11-06 18:43:45,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:45,846 INFO L225 Difference]: With dead ends: 68 [2019-11-06 18:43:45,846 INFO L226 Difference]: Without dead ends: 44 [2019-11-06 18:43:45,846 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-11-06 18:43:45,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-11-06 18:43:45,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2019-11-06 18:43:45,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-11-06 18:43:45,851 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-11-06 18:43:45,852 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2019-11-06 18:43:45,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:45,852 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-11-06 18:43:45,852 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-11-06 18:43:45,852 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-11-06 18:43:45,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2019-11-06 18:43:45,853 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:45,853 INFO L410 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:46,057 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:46,058 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:46,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:46,058 INFO L82 PathProgramCache]: Analyzing trace with hash 1013862662, now seen corresponding path program 12 times [2019-11-06 18:43:46,058 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:46,058 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1522767390] [2019-11-06 18:43:46,059 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:46,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:46,194 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-06 18:43:46,194 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1522767390] [2019-11-06 18:43:46,194 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2093588860] [2019-11-06 18:43:46,195 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:46,779 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-11-06 18:43:46,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:46,782 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 14 conjunts are in the unsatisfiable core [2019-11-06 18:43:46,784 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:46,804 INFO L134 CoverageAnalysis]: Checked inductivity of 156 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2019-11-06 18:43:46,804 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:46,804 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-11-06 18:43:46,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1920298222] [2019-11-06 18:43:46,805 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-11-06 18:43:46,805 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:46,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-11-06 18:43:46,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:43:46,806 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 17 states. [2019-11-06 18:43:46,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:46,907 INFO L93 Difference]: Finished difference Result 71 states and 76 transitions. [2019-11-06 18:43:46,907 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-11-06 18:43:46,907 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2019-11-06 18:43:46,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:46,908 INFO L225 Difference]: With dead ends: 71 [2019-11-06 18:43:46,908 INFO L226 Difference]: Without dead ends: 46 [2019-11-06 18:43:46,909 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-11-06 18:43:46,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2019-11-06 18:43:46,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2019-11-06 18:43:46,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2019-11-06 18:43:46,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2019-11-06 18:43:46,914 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 39 [2019-11-06 18:43:46,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:46,915 INFO L462 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2019-11-06 18:43:46,915 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-11-06 18:43:46,915 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2019-11-06 18:43:46,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-11-06 18:43:46,916 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:46,916 INFO L410 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:47,120 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,120 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:47,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:47,121 INFO L82 PathProgramCache]: Analyzing trace with hash 1100207717, now seen corresponding path program 13 times [2019-11-06 18:43:47,121 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:47,122 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1761556747] [2019-11-06 18:43:47,122 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:47,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,293 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-06 18:43:47,293 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1761556747] [2019-11-06 18:43:47,293 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857475327] [2019-11-06 18:43:47,293 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,344 INFO L256 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 15 conjunts are in the unsatisfiable core [2019-11-06 18:43:47,346 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:47,391 INFO L134 CoverageAnalysis]: Checked inductivity of 182 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2019-11-06 18:43:47,392 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:47,392 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-11-06 18:43:47,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [865764435] [2019-11-06 18:43:47,393 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-11-06 18:43:47,393 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:47,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-11-06 18:43:47,394 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:47,394 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 18 states. [2019-11-06 18:43:47,524 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:47,524 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2019-11-06 18:43:47,525 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-11-06 18:43:47,525 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 41 [2019-11-06 18:43:47,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:47,526 INFO L225 Difference]: With dead ends: 74 [2019-11-06 18:43:47,526 INFO L226 Difference]: Without dead ends: 48 [2019-11-06 18:43:47,527 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-11-06 18:43:47,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2019-11-06 18:43:47,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2019-11-06 18:43:47,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2019-11-06 18:43:47,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2019-11-06 18:43:47,533 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 41 [2019-11-06 18:43:47,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:47,534 INFO L462 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2019-11-06 18:43:47,534 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-11-06 18:43:47,534 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2019-11-06 18:43:47,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2019-11-06 18:43:47,535 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:47,535 INFO L410 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:47,738 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,739 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:47,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:47,739 INFO L82 PathProgramCache]: Analyzing trace with hash 397624678, now seen corresponding path program 14 times [2019-11-06 18:43:47,740 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:47,740 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [292757195] [2019-11-06 18:43:47,740 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:47,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:47,927 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-06 18:43:47,928 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [292757195] [2019-11-06 18:43:47,928 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213223130] [2019-11-06 18:43:47,928 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:47,989 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:43:47,989 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:47,992 INFO L256 TraceCheckSpWp]: Trace formula consists of 167 conjuncts, 16 conjunts are in the unsatisfiable core [2019-11-06 18:43:47,994 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:48,025 INFO L134 CoverageAnalysis]: Checked inductivity of 210 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2019-11-06 18:43:48,025 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:48,025 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-11-06 18:43:48,026 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1845986667] [2019-11-06 18:43:48,026 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-11-06 18:43:48,026 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:48,027 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-11-06 18:43:48,031 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:48,031 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 19 states. [2019-11-06 18:43:48,164 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:48,164 INFO L93 Difference]: Finished difference Result 77 states and 82 transitions. [2019-11-06 18:43:48,164 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-11-06 18:43:48,164 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 43 [2019-11-06 18:43:48,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:48,165 INFO L225 Difference]: With dead ends: 77 [2019-11-06 18:43:48,165 INFO L226 Difference]: Without dead ends: 50 [2019-11-06 18:43:48,167 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 44 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-11-06 18:43:48,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2019-11-06 18:43:48,172 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2019-11-06 18:43:48,172 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2019-11-06 18:43:48,173 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2019-11-06 18:43:48,177 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 43 [2019-11-06 18:43:48,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:48,177 INFO L462 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2019-11-06 18:43:48,177 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-11-06 18:43:48,177 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2019-11-06 18:43:48,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2019-11-06 18:43:48,178 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:48,178 INFO L410 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:48,381 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:48,381 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:48,381 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:48,382 INFO L82 PathProgramCache]: Analyzing trace with hash -400171259, now seen corresponding path program 15 times [2019-11-06 18:43:48,382 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:48,382 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [970719664] [2019-11-06 18:43:48,382 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:48,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:48,589 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-06 18:43:48,589 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [970719664] [2019-11-06 18:43:48,590 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [405097026] [2019-11-06 18:43:48,591 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,055 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-11-06 18:43:49,056 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:49,057 INFO L256 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 17 conjunts are in the unsatisfiable core [2019-11-06 18:43:49,059 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:49,075 INFO L134 CoverageAnalysis]: Checked inductivity of 240 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2019-11-06 18:43:49,079 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:49,080 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-11-06 18:43:49,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1488189373] [2019-11-06 18:43:49,080 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-11-06 18:43:49,081 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:49,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-11-06 18:43:49,082 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:43:49,082 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 20 states. [2019-11-06 18:43:49,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:49,170 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2019-11-06 18:43:49,170 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-11-06 18:43:49,170 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 45 [2019-11-06 18:43:49,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:49,171 INFO L225 Difference]: With dead ends: 80 [2019-11-06 18:43:49,171 INFO L226 Difference]: Without dead ends: 52 [2019-11-06 18:43:49,172 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-11-06 18:43:49,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2019-11-06 18:43:49,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 52. [2019-11-06 18:43:49,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-11-06 18:43:49,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2019-11-06 18:43:49,177 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 45 [2019-11-06 18:43:49,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:49,177 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2019-11-06 18:43:49,177 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-11-06 18:43:49,177 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2019-11-06 18:43:49,178 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-11-06 18:43:49,178 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:49,178 INFO L410 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:49,387 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,387 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:49,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:49,388 INFO L82 PathProgramCache]: Analyzing trace with hash -264076858, now seen corresponding path program 16 times [2019-11-06 18:43:49,388 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:49,388 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898632588] [2019-11-06 18:43:49,388 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:49,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:49,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:49,570 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:43:49,570 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898632588] [2019-11-06 18:43:49,570 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1000047538] [2019-11-06 18:43:49,571 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,621 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:43:49,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:49,622 INFO L256 TraceCheckSpWp]: Trace formula consists of 183 conjuncts, 18 conjunts are in the unsatisfiable core [2019-11-06 18:43:49,623 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:49,645 INFO L134 CoverageAnalysis]: Checked inductivity of 272 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2019-11-06 18:43:49,645 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:49,645 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-11-06 18:43:49,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1238561702] [2019-11-06 18:43:49,646 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-11-06 18:43:49,646 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:49,646 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-11-06 18:43:49,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:49,647 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 21 states. [2019-11-06 18:43:49,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:49,746 INFO L93 Difference]: Finished difference Result 83 states and 88 transitions. [2019-11-06 18:43:49,747 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-11-06 18:43:49,747 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 47 [2019-11-06 18:43:49,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:49,748 INFO L225 Difference]: With dead ends: 83 [2019-11-06 18:43:49,748 INFO L226 Difference]: Without dead ends: 54 [2019-11-06 18:43:49,748 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-11-06 18:43:49,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-11-06 18:43:49,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2019-11-06 18:43:49,753 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-11-06 18:43:49,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2019-11-06 18:43:49,753 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 47 [2019-11-06 18:43:49,754 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:49,754 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2019-11-06 18:43:49,754 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-11-06 18:43:49,754 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2019-11-06 18:43:49,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2019-11-06 18:43:49,754 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:49,755 INFO L410 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:49,964 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:49,964 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:49,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:49,965 INFO L82 PathProgramCache]: Analyzing trace with hash 387325861, now seen corresponding path program 17 times [2019-11-06 18:43:49,965 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:49,965 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [320885339] [2019-11-06 18:43:49,966 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:49,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:50,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:50,182 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:43:50,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [320885339] [2019-11-06 18:43:50,182 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [758127267] [2019-11-06 18:43:50,183 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 [2019-11-06 18:43:56,684 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-11-06 18:43:56,684 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:56,695 INFO L256 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 19 conjunts are in the unsatisfiable core [2019-11-06 18:43:56,696 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:56,726 INFO L134 CoverageAnalysis]: Checked inductivity of 306 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 153 trivial. 0 not checked. [2019-11-06 18:43:56,726 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:56,726 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-11-06 18:43:56,726 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [180863426] [2019-11-06 18:43:56,726 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-11-06 18:43:56,727 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:56,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-11-06 18:43:56,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:56,728 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 22 states. [2019-11-06 18:43:56,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:56,815 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2019-11-06 18:43:56,815 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-11-06 18:43:56,815 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 49 [2019-11-06 18:43:56,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:56,816 INFO L225 Difference]: With dead ends: 86 [2019-11-06 18:43:56,816 INFO L226 Difference]: Without dead ends: 56 [2019-11-06 18:43:56,817 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-11-06 18:43:56,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2019-11-06 18:43:56,821 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 56. [2019-11-06 18:43:56,821 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-11-06 18:43:56,821 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-11-06 18:43:56,822 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 49 [2019-11-06 18:43:56,822 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:56,822 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-11-06 18:43:56,822 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-11-06 18:43:56,822 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-11-06 18:43:56,823 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-11-06 18:43:56,823 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:56,823 INFO L410 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:57,030 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:57,031 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:57,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:57,031 INFO L82 PathProgramCache]: Analyzing trace with hash -1900411354, now seen corresponding path program 18 times [2019-11-06 18:43:57,031 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:57,032 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [151450786] [2019-11-06 18:43:57,032 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:57,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:57,277 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-11-06 18:43:57,277 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [151450786] [2019-11-06 18:43:57,277 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1030306788] [2019-11-06 18:43:57,277 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 [2019-11-06 18:43:58,593 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 10 check-sat command(s) [2019-11-06 18:43:58,593 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:43:58,600 INFO L256 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 18:43:58,601 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:58,618 INFO L134 CoverageAnalysis]: Checked inductivity of 342 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2019-11-06 18:43:58,619 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:58,619 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-11-06 18:43:58,619 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2047080174] [2019-11-06 18:43:58,620 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-11-06 18:43:58,620 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:58,620 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-11-06 18:43:58,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:43:58,621 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 23 states. [2019-11-06 18:43:58,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:58,735 INFO L93 Difference]: Finished difference Result 89 states and 94 transitions. [2019-11-06 18:43:58,735 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-11-06 18:43:58,736 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 51 [2019-11-06 18:43:58,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:58,736 INFO L225 Difference]: With dead ends: 89 [2019-11-06 18:43:58,736 INFO L226 Difference]: Without dead ends: 58 [2019-11-06 18:43:58,737 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-11-06 18:43:58,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2019-11-06 18:43:58,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2019-11-06 18:43:58,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-11-06 18:43:58,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-11-06 18:43:58,748 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 51 [2019-11-06 18:43:58,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:58,749 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-11-06 18:43:58,749 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-11-06 18:43:58,749 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-11-06 18:43:58,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-11-06 18:43:58,749 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:58,750 INFO L410 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:58,955 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:58,955 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:58,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:58,956 INFO L82 PathProgramCache]: Analyzing trace with hash -574187451, now seen corresponding path program 19 times [2019-11-06 18:43:58,956 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:58,957 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [978896309] [2019-11-06 18:43:58,957 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:58,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,222 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-11-06 18:43:59,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [978896309] [2019-11-06 18:43:59,223 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [743082265] [2019-11-06 18:43:59,223 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 [2019-11-06 18:43:59,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:43:59,303 INFO L256 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 21 conjunts are in the unsatisfiable core [2019-11-06 18:43:59,306 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:43:59,351 INFO L134 CoverageAnalysis]: Checked inductivity of 380 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2019-11-06 18:43:59,351 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:43:59,352 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22] total 24 [2019-11-06 18:43:59,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233216265] [2019-11-06 18:43:59,352 INFO L442 AbstractCegarLoop]: Interpolant automaton has 24 states [2019-11-06 18:43:59,353 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:43:59,354 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2019-11-06 18:43:59,355 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:59,355 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 24 states. [2019-11-06 18:43:59,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:43:59,562 INFO L93 Difference]: Finished difference Result 92 states and 97 transitions. [2019-11-06 18:43:59,562 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2019-11-06 18:43:59,562 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 53 [2019-11-06 18:43:59,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:43:59,563 INFO L225 Difference]: With dead ends: 92 [2019-11-06 18:43:59,564 INFO L226 Difference]: Without dead ends: 60 [2019-11-06 18:43:59,564 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2019-11-06 18:43:59,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2019-11-06 18:43:59,568 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2019-11-06 18:43:59,569 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2019-11-06 18:43:59,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2019-11-06 18:43:59,570 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 53 [2019-11-06 18:43:59,570 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:43:59,570 INFO L462 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2019-11-06 18:43:59,570 INFO L463 AbstractCegarLoop]: Interpolant automaton has 24 states. [2019-11-06 18:43:59,570 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2019-11-06 18:43:59,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-11-06 18:43:59,571 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:43:59,571 INFO L410 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:43:59,776 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:43:59,777 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:43:59,777 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:43:59,777 INFO L82 PathProgramCache]: Analyzing trace with hash -2076716410, now seen corresponding path program 20 times [2019-11-06 18:43:59,777 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:43:59,777 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1097638329] [2019-11-06 18:43:59,777 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:43:59,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,032 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-11-06 18:44:00,032 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1097638329] [2019-11-06 18:44:00,032 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888953182] [2019-11-06 18:44:00,032 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 [2019-11-06 18:44:00,097 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-11-06 18:44:00,097 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:00,099 INFO L256 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 22 conjunts are in the unsatisfiable core [2019-11-06 18:44:00,100 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:00,116 INFO L134 CoverageAnalysis]: Checked inductivity of 420 backedges. 0 proven. 210 refuted. 0 times theorem prover too weak. 210 trivial. 0 not checked. [2019-11-06 18:44:00,116 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:00,116 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 23] total 25 [2019-11-06 18:44:00,116 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493313827] [2019-11-06 18:44:00,117 INFO L442 AbstractCegarLoop]: Interpolant automaton has 25 states [2019-11-06 18:44:00,117 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:00,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2019-11-06 18:44:00,117 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:44:00,117 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 25 states. [2019-11-06 18:44:00,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:00,258 INFO L93 Difference]: Finished difference Result 95 states and 100 transitions. [2019-11-06 18:44:00,261 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2019-11-06 18:44:00,261 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 55 [2019-11-06 18:44:00,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:00,262 INFO L225 Difference]: With dead ends: 95 [2019-11-06 18:44:00,262 INFO L226 Difference]: Without dead ends: 62 [2019-11-06 18:44:00,262 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 56 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2019-11-06 18:44:00,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2019-11-06 18:44:00,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2019-11-06 18:44:00,267 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-11-06 18:44:00,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-11-06 18:44:00,267 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 55 [2019-11-06 18:44:00,268 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:00,268 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-11-06 18:44:00,268 INFO L463 AbstractCegarLoop]: Interpolant automaton has 25 states. [2019-11-06 18:44:00,268 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-11-06 18:44:00,269 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-11-06 18:44:00,269 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:00,269 INFO L410 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:00,472 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:00,473 INFO L410 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:00,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:00,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1931036901, now seen corresponding path program 21 times [2019-11-06 18:44:00,474 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:00,474 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75639654] [2019-11-06 18:44:00,474 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:00,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:00,768 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-11-06 18:44:00,769 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75639654] [2019-11-06 18:44:00,769 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [324137390] [2019-11-06 18:44:00,769 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 [2019-11-06 18:44:02,262 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2019-11-06 18:44:02,262 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:02,265 INFO L256 TraceCheckSpWp]: Trace formula consists of 223 conjuncts, 23 conjunts are in the unsatisfiable core [2019-11-06 18:44:02,267 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:02,280 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 231 refuted. 0 times theorem prover too weak. 231 trivial. 0 not checked. [2019-11-06 18:44:02,280 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:02,280 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 24] total 26 [2019-11-06 18:44:02,281 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227657123] [2019-11-06 18:44:02,281 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-11-06 18:44:02,281 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:02,282 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-11-06 18:44:02,282 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:44:02,282 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 26 states. [2019-11-06 18:44:02,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:02,411 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2019-11-06 18:44:02,412 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-11-06 18:44:02,412 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 57 [2019-11-06 18:44:02,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:02,413 INFO L225 Difference]: With dead ends: 98 [2019-11-06 18:44:02,413 INFO L226 Difference]: Without dead ends: 64 [2019-11-06 18:44:02,413 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2019-11-06 18:44:02,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-11-06 18:44:02,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2019-11-06 18:44:02,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-11-06 18:44:02,418 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-11-06 18:44:02,418 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 57 [2019-11-06 18:44:02,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:02,419 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-11-06 18:44:02,419 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-11-06 18:44:02,419 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-11-06 18:44:02,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-11-06 18:44:02,419 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:02,419 INFO L410 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:02,625 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:02,626 INFO L410 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:02,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:02,626 INFO L82 PathProgramCache]: Analyzing trace with hash 173663974, now seen corresponding path program 22 times [2019-11-06 18:44:02,626 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:02,626 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [999555945] [2019-11-06 18:44:02,626 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:02,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:02,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:02,929 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-06 18:44:02,930 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [999555945] [2019-11-06 18:44:02,930 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [135712025] [2019-11-06 18:44:02,930 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 [2019-11-06 18:44:03,026 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-11-06 18:44:03,027 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-11-06 18:44:03,028 INFO L256 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 24 conjunts are in the unsatisfiable core [2019-11-06 18:44:03,029 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-11-06 18:44:03,047 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2019-11-06 18:44:03,048 INFO L218 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-11-06 18:44:03,048 INFO L231 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25] total 27 [2019-11-06 18:44:03,048 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [21228171] [2019-11-06 18:44:03,048 INFO L442 AbstractCegarLoop]: Interpolant automaton has 27 states [2019-11-06 18:44:03,049 INFO L141 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-11-06 18:44:03,049 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2019-11-06 18:44:03,049 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:44:03,049 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 27 states. [2019-11-06 18:44:03,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-11-06 18:44:03,237 INFO L93 Difference]: Finished difference Result 101 states and 106 transitions. [2019-11-06 18:44:03,237 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-11-06 18:44:03,237 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 59 [2019-11-06 18:44:03,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-11-06 18:44:03,238 INFO L225 Difference]: With dead ends: 101 [2019-11-06 18:44:03,238 INFO L226 Difference]: Without dead ends: 66 [2019-11-06 18:44:03,239 INFO L630 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2019-11-06 18:44:03,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2019-11-06 18:44:03,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2019-11-06 18:44:03,242 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-11-06 18:44:03,243 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-11-06 18:44:03,243 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 59 [2019-11-06 18:44:03,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-11-06 18:44:03,243 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-11-06 18:44:03,243 INFO L463 AbstractCegarLoop]: Interpolant automaton has 27 states. [2019-11-06 18:44:03,243 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-11-06 18:44:03,244 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-11-06 18:44:03,244 INFO L402 BasicCegarLoop]: Found error trace [2019-11-06 18:44:03,244 INFO L410 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-11-06 18:44:03,447 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-11-06 18:44:03,448 INFO L410 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-11-06 18:44:03,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-11-06 18:44:03,448 INFO L82 PathProgramCache]: Analyzing trace with hash 1433416069, now seen corresponding path program 23 times [2019-11-06 18:44:03,449 INFO L161 FreeRefinementEngine]: Executing refinement strategy CAMEL [2019-11-06 18:44:03,449 INFO L337 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129885175] [2019-11-06 18:44:03,449 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-11-06 18:44:03,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:03,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-11-06 18:44:03,806 INFO L134 CoverageAnalysis]: Checked inductivity of 552 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 276 trivial. 0 not checked. [2019-11-06 18:44:03,806 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129885175] [2019-11-06 18:44:03,806 INFO L337 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2035652832] [2019-11-06 18:44:03,806 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