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_copyInitSum2_ground-2.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:44:15,047 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:44:15,050 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:44:15,063 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:44:15,063 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:44:15,064 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:44:15,066 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:44:15,068 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:44:15,070 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:44:15,071 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:44:15,072 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:44:15,073 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:44:15,073 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:44:15,074 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:44:15,076 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:44:15,077 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:44:15,078 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:44:15,081 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:44:15,083 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:44:15,085 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:44:15,090 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:44:15,091 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:44:15,092 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:44:15,095 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:44:15,098 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:44:15,104 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:44:15,105 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:44:15,106 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:44:15,107 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:44:15,111 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:44:15,111 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:44:15,112 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:44:15,112 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:44:15,112 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:44:15,114 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:44:15,117 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:44:15,117 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2019-10-14 21:44:15,137 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:44:15,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:44:15,139 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:44:15,139 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:44:15,139 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:44:15,140 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:44:15,140 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:44:15,140 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:44:15,140 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:44:15,140 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:44:15,141 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:44:15,142 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:44:15,142 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:44:15,142 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:44:15,143 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:44:15,143 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:44:15,143 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:44:15,143 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:44:15,143 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:44:15,143 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:44:15,144 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:44:15,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:15,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:44:15,144 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:44:15,144 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:44:15,145 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:44:15,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:44:15,145 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:44:15,145 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:44:15,443 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:44:15,464 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:44:15,467 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:44:15,469 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:44:15,469 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:44:15,470 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-2.i [2019-10-14 21:44:15,534 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c3525bd7/e86f4f74c0304951869eea86dc38dcd8/FLAG304cc7e54 [2019-10-14 21:44:15,960 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:44:15,961 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_copyInitSum2_ground-2.i [2019-10-14 21:44:15,967 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c3525bd7/e86f4f74c0304951869eea86dc38dcd8/FLAG304cc7e54 [2019-10-14 21:44:16,309 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1c3525bd7/e86f4f74c0304951869eea86dc38dcd8 [2019-10-14 21:44:16,318 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:44:16,320 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:44:16,321 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:16,321 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:44:16,326 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:44:16,327 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,330 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3f33695a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16, skipping insertion in model container [2019-10-14 21:44:16,330 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,338 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:44:16,359 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:44:16,566 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:16,578 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:44:16,611 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:44:16,636 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:44:16,637 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16 WrapperNode [2019-10-14 21:44:16,638 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:44:16,638 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:44:16,639 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:44:16,639 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:44:16,765 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,766 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,775 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,776 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,794 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,802 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,808 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... [2019-10-14 21:44:16,811 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:44:16,812 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:44:16,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:44:16,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:44:16,813 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:44:16,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:44:16,870 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:44:16,870 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:44:16,870 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:44:16,871 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:44:16,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:44:16,872 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:44:17,128 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:44:17,129 INFO L284 CfgBuilder]: Removed 4 assume(true) statements. [2019-10-14 21:44:17,131 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:17 BoogieIcfgContainer [2019-10-14 21:44:17,131 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:44:17,133 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:44:17,133 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:44:17,136 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:44:17,136 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:44:16" (1/3) ... [2019-10-14 21:44:17,137 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec24f8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:17, skipping insertion in model container [2019-10-14 21:44:17,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:44:16" (2/3) ... [2019-10-14 21:44:17,138 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2ec24f8e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:44:17, skipping insertion in model container [2019-10-14 21:44:17,138 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:44:17" (3/3) ... [2019-10-14 21:44:17,140 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_copyInitSum2_ground-2.i [2019-10-14 21:44:17,157 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:44:17,177 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:44:17,192 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:44:17,230 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:44:17,233 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:44:17,233 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:44:17,234 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:44:17,234 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:44:17,234 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:44:17,234 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:44:17,234 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:44:17,255 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2019-10-14 21:44:17,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:44:17,263 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:17,264 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:17,266 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:17,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:17,273 INFO L82 PathProgramCache]: Analyzing trace with hash 1001985310, now seen corresponding path program 1 times [2019-10-14 21:44:17,290 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:17,290 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214804020] [2019-10-14 21:44:17,294 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,294 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,294 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:17,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:17,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:17,464 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:17,465 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214804020] [2019-10-14 21:44:17,465 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:17,466 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:44:17,466 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948682029] [2019-10-14 21:44:17,471 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:44:17,471 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:17,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:44:17,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:17,488 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 3 states. [2019-10-14 21:44:17,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:17,614 INFO L93 Difference]: Finished difference Result 51 states and 66 transitions. [2019-10-14 21:44:17,614 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:44:17,616 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 17 [2019-10-14 21:44:17,616 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:17,623 INFO L225 Difference]: With dead ends: 51 [2019-10-14 21:44:17,624 INFO L226 Difference]: Without dead ends: 24 [2019-10-14 21:44:17,627 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:44:17,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2019-10-14 21:44:17,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2019-10-14 21:44:17,665 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:44:17,666 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2019-10-14 21:44:17,668 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 17 [2019-10-14 21:44:17,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:17,668 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2019-10-14 21:44:17,669 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:44:17,669 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2019-10-14 21:44:17,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:44:17,670 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:17,670 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:17,671 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:17,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:17,671 INFO L82 PathProgramCache]: Analyzing trace with hash -400143846, now seen corresponding path program 1 times [2019-10-14 21:44:17,672 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:17,672 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422021879] [2019-10-14 21:44:17,672 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,672 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,673 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:17,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:17,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:17,746 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:44:17,746 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422021879] [2019-10-14 21:44:17,747 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:44:17,747 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:44:17,747 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106458941] [2019-10-14 21:44:17,749 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:44:17,749 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:17,750 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:44:17,750 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:17,750 INFO L87 Difference]: Start difference. First operand 24 states and 27 transitions. Second operand 4 states. [2019-10-14 21:44:17,888 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:17,888 INFO L93 Difference]: Finished difference Result 46 states and 54 transitions. [2019-10-14 21:44:17,889 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:44:17,889 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 17 [2019-10-14 21:44:17,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:17,891 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:44:17,891 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:44:17,893 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:44:17,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:44:17,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2019-10-14 21:44:17,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2019-10-14 21:44:17,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 30 transitions. [2019-10-14 21:44:17,909 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 30 transitions. Word has length 17 [2019-10-14 21:44:17,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:17,910 INFO L462 AbstractCegarLoop]: Abstraction has 27 states and 30 transitions. [2019-10-14 21:44:17,910 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:44:17,910 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 30 transitions. [2019-10-14 21:44:17,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2019-10-14 21:44:17,913 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:17,914 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:17,914 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:17,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:17,915 INFO L82 PathProgramCache]: Analyzing trace with hash -1150570790, now seen corresponding path program 1 times [2019-10-14 21:44:17,916 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:17,917 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [303277105] [2019-10-14 21:44:17,917 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,917 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:17,918 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:17,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:18,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:18,062 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:44:18,062 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [303277105] [2019-10-14 21:44:18,062 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010146807] [2019-10-14 21:44:18,063 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:18,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:18,127 INFO L256 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:44:18,139 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:18,179 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:44:18,179 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:18,179 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:44:18,180 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092125682] [2019-10-14 21:44:18,180 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:44:18,181 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:18,181 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:44:18,181 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:18,181 INFO L87 Difference]: Start difference. First operand 27 states and 30 transitions. Second operand 6 states. [2019-10-14 21:44:18,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:18,303 INFO L93 Difference]: Finished difference Result 53 states and 61 transitions. [2019-10-14 21:44:18,303 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:44:18,303 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 22 [2019-10-14 21:44:18,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:18,305 INFO L225 Difference]: With dead ends: 53 [2019-10-14 21:44:18,305 INFO L226 Difference]: Without dead ends: 34 [2019-10-14 21:44:18,306 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:44:18,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2019-10-14 21:44:18,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2019-10-14 21:44:18,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2019-10-14 21:44:18,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 35 transitions. [2019-10-14 21:44:18,314 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 35 transitions. Word has length 22 [2019-10-14 21:44:18,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:18,314 INFO L462 AbstractCegarLoop]: Abstraction has 32 states and 35 transitions. [2019-10-14 21:44:18,314 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:44:18,315 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 35 transitions. [2019-10-14 21:44:18,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2019-10-14 21:44:18,316 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:18,316 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:18,520 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:18,520 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:18,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:18,521 INFO L82 PathProgramCache]: Analyzing trace with hash -1868122094, now seen corresponding path program 2 times [2019-10-14 21:44:18,521 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:18,521 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725163210] [2019-10-14 21:44:18,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:18,522 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:18,522 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:18,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:18,636 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:18,659 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-14 21:44:18,660 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725163210] [2019-10-14 21:44:18,661 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1114001413] [2019-10-14 21:44:18,662 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:18,704 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:18,705 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:18,706 INFO L256 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:44:18,708 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:18,720 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2019-10-14 21:44:18,721 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:18,721 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:44:18,721 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089020878] [2019-10-14 21:44:18,722 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:44:18,722 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:18,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:44:18,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:18,723 INFO L87 Difference]: Start difference. First operand 32 states and 35 transitions. Second operand 7 states. [2019-10-14 21:44:18,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:18,836 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2019-10-14 21:44:18,836 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:44:18,836 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 27 [2019-10-14 21:44:18,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:18,837 INFO L225 Difference]: With dead ends: 62 [2019-10-14 21:44:18,837 INFO L226 Difference]: Without dead ends: 39 [2019-10-14 21:44:18,838 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:44:18,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2019-10-14 21:44:18,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 37. [2019-10-14 21:44:18,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2019-10-14 21:44:18,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 40 transitions. [2019-10-14 21:44:18,845 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 40 transitions. Word has length 27 [2019-10-14 21:44:18,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:18,846 INFO L462 AbstractCegarLoop]: Abstraction has 37 states and 40 transitions. [2019-10-14 21:44:18,846 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:44:18,846 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 40 transitions. [2019-10-14 21:44:18,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2019-10-14 21:44:18,847 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:18,847 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:19,051 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:19,052 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:19,052 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:19,052 INFO L82 PathProgramCache]: Analyzing trace with hash 150752210, now seen corresponding path program 3 times [2019-10-14 21:44:19,053 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:19,053 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [243105813] [2019-10-14 21:44:19,054 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:19,054 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:19,054 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:19,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:19,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:19,177 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:44:19,178 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [243105813] [2019-10-14 21:44:19,178 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411246081] [2019-10-14 21:44:19,178 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:19,231 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:44:19,231 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:19,232 INFO L256 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:44:19,236 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:19,259 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:44:19,261 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:19,261 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:44:19,261 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1460334235] [2019-10-14 21:44:19,262 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:44:19,262 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:19,262 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:44:19,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:19,263 INFO L87 Difference]: Start difference. First operand 37 states and 40 transitions. Second operand 8 states. [2019-10-14 21:44:19,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:19,416 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2019-10-14 21:44:19,416 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:44:19,417 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 32 [2019-10-14 21:44:19,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:19,418 INFO L225 Difference]: With dead ends: 71 [2019-10-14 21:44:19,418 INFO L226 Difference]: Without dead ends: 44 [2019-10-14 21:44:19,422 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:44:19,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2019-10-14 21:44:19,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 42. [2019-10-14 21:44:19,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2019-10-14 21:44:19,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 45 transitions. [2019-10-14 21:44:19,436 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 45 transitions. Word has length 32 [2019-10-14 21:44:19,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:19,437 INFO L462 AbstractCegarLoop]: Abstraction has 42 states and 45 transitions. [2019-10-14 21:44:19,437 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:44:19,437 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 45 transitions. [2019-10-14 21:44:19,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:44:19,439 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:19,439 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:19,648 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:19,648 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:19,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:19,649 INFO L82 PathProgramCache]: Analyzing trace with hash -125121014, now seen corresponding path program 4 times [2019-10-14 21:44:19,649 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:19,649 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [480018861] [2019-10-14 21:44:19,649 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:19,650 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:19,650 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:19,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:19,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:19,730 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2019-10-14 21:44:19,730 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [480018861] [2019-10-14 21:44:19,730 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984202189] [2019-10-14 21:44:19,730 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:19,772 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:19,772 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:19,773 INFO L256 TraceCheckSpWp]: Trace formula consists of 112 conjuncts, 6 conjunts are in the unsatisfiable core [2019-10-14 21:44:19,776 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:19,793 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2019-10-14 21:44:19,794 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:19,794 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2019-10-14 21:44:19,794 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1858667467] [2019-10-14 21:44:19,794 INFO L442 AbstractCegarLoop]: Interpolant automaton has 9 states [2019-10-14 21:44:19,795 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:19,795 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2019-10-14 21:44:19,795 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:19,795 INFO L87 Difference]: Start difference. First operand 42 states and 45 transitions. Second operand 9 states. [2019-10-14 21:44:19,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:19,894 INFO L93 Difference]: Finished difference Result 80 states and 88 transitions. [2019-10-14 21:44:19,895 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2019-10-14 21:44:19,895 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 37 [2019-10-14 21:44:19,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:19,896 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:44:19,896 INFO L226 Difference]: Without dead ends: 49 [2019-10-14 21:44:19,897 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2019-10-14 21:44:19,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2019-10-14 21:44:19,903 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 47. [2019-10-14 21:44:19,903 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2019-10-14 21:44:19,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 50 transitions. [2019-10-14 21:44:19,905 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 50 transitions. Word has length 37 [2019-10-14 21:44:19,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:19,905 INFO L462 AbstractCegarLoop]: Abstraction has 47 states and 50 transitions. [2019-10-14 21:44:19,905 INFO L463 AbstractCegarLoop]: Interpolant automaton has 9 states. [2019-10-14 21:44:19,906 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 50 transitions. [2019-10-14 21:44:19,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2019-10-14 21:44:19,907 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:19,907 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,118 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:20,119 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1558523702, now seen corresponding path program 5 times [2019-10-14 21:44:20,121 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,121 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876407504] [2019-10-14 21:44:20,121 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,122 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,122 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:20,265 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 21:44:20,265 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876407504] [2019-10-14 21:44:20,266 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [708779714] [2019-10-14 21:44:20,266 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:20,451 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2019-10-14 21:44:20,451 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:20,453 INFO L256 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:44:20,455 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:20,488 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2019-10-14 21:44:20,489 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:20,489 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:44:20,489 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124695514] [2019-10-14 21:44:20,490 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:44:20,491 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:20,491 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:44:20,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:20,492 INFO L87 Difference]: Start difference. First operand 47 states and 50 transitions. Second operand 10 states. [2019-10-14 21:44:20,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:20,640 INFO L93 Difference]: Finished difference Result 89 states and 97 transitions. [2019-10-14 21:44:20,641 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:44:20,641 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 42 [2019-10-14 21:44:20,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:20,642 INFO L225 Difference]: With dead ends: 89 [2019-10-14 21:44:20,642 INFO L226 Difference]: Without dead ends: 54 [2019-10-14 21:44:20,643 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:44:20,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2019-10-14 21:44:20,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 52. [2019-10-14 21:44:20,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2019-10-14 21:44:20,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 55 transitions. [2019-10-14 21:44:20,650 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 55 transitions. Word has length 42 [2019-10-14 21:44:20,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:20,650 INFO L462 AbstractCegarLoop]: Abstraction has 52 states and 55 transitions. [2019-10-14 21:44:20,650 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:44:20,651 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 55 transitions. [2019-10-14 21:44:20,652 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2019-10-14 21:44:20,652 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:20,652 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:20,856 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:20,856 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:20,857 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:20,857 INFO L82 PathProgramCache]: Analyzing trace with hash -1349350398, now seen corresponding path program 6 times [2019-10-14 21:44:20,857 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:20,858 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2053586481] [2019-10-14 21:44:20,858 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,858 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:20,858 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:20,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,015 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2019-10-14 21:44:21,015 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2053586481] [2019-10-14 21:44:21,015 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643404073] [2019-10-14 21:44:21,015 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,144 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 7 check-sat command(s) [2019-10-14 21:44:21,144 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:21,146 INFO L256 TraceCheckSpWp]: Trace formula consists of 136 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:44:21,150 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:21,172 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2019-10-14 21:44:21,173 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:21,173 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 11 [2019-10-14 21:44:21,173 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [685316985] [2019-10-14 21:44:21,174 INFO L442 AbstractCegarLoop]: Interpolant automaton has 11 states [2019-10-14 21:44:21,174 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:21,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2019-10-14 21:44:21,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:21,175 INFO L87 Difference]: Start difference. First operand 52 states and 55 transitions. Second operand 11 states. [2019-10-14 21:44:21,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:21,336 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2019-10-14 21:44:21,336 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2019-10-14 21:44:21,337 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 47 [2019-10-14 21:44:21,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:21,338 INFO L225 Difference]: With dead ends: 98 [2019-10-14 21:44:21,338 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 21:44:21,339 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2019-10-14 21:44:21,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 21:44:21,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 57. [2019-10-14 21:44:21,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2019-10-14 21:44:21,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2019-10-14 21:44:21,346 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 47 [2019-10-14 21:44:21,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:21,346 INFO L462 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2019-10-14 21:44:21,346 INFO L463 AbstractCegarLoop]: Interpolant automaton has 11 states. [2019-10-14 21:44:21,346 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2019-10-14 21:44:21,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2019-10-14 21:44:21,347 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:21,348 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:21,552 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,553 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:21,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:21,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1128841790, now seen corresponding path program 7 times [2019-10-14 21:44:21,553 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:21,553 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [878049666] [2019-10-14 21:44:21,553 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:21,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:21,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,658 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-14 21:44:21,659 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [878049666] [2019-10-14 21:44:21,659 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [51997160] [2019-10-14 21:44:21,659 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:21,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:21,713 INFO L256 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 9 conjunts are in the unsatisfiable core [2019-10-14 21:44:21,716 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:21,736 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 98 trivial. 0 not checked. [2019-10-14 21:44:21,737 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:21,737 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 12 [2019-10-14 21:44:21,737 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387824512] [2019-10-14 21:44:21,737 INFO L442 AbstractCegarLoop]: Interpolant automaton has 12 states [2019-10-14 21:44:21,738 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:21,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2019-10-14 21:44:21,738 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:21,738 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 12 states. [2019-10-14 21:44:21,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:21,913 INFO L93 Difference]: Finished difference Result 107 states and 115 transitions. [2019-10-14 21:44:21,914 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2019-10-14 21:44:21,914 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 52 [2019-10-14 21:44:21,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:21,915 INFO L225 Difference]: With dead ends: 107 [2019-10-14 21:44:21,915 INFO L226 Difference]: Without dead ends: 64 [2019-10-14 21:44:21,916 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 53 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2019-10-14 21:44:21,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2019-10-14 21:44:21,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 62. [2019-10-14 21:44:21,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-14 21:44:21,923 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 65 transitions. [2019-10-14 21:44:21,923 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 65 transitions. Word has length 52 [2019-10-14 21:44:21,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:21,923 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 65 transitions. [2019-10-14 21:44:21,923 INFO L463 AbstractCegarLoop]: Interpolant automaton has 12 states. [2019-10-14 21:44:21,924 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 65 transitions. [2019-10-14 21:44:21,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2019-10-14 21:44:21,925 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:21,925 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:22,134 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:22,135 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:22,135 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:22,135 INFO L82 PathProgramCache]: Analyzing trace with hash -612503046, now seen corresponding path program 8 times [2019-10-14 21:44:22,136 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:22,136 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [374601156] [2019-10-14 21:44:22,137 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:22,137 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:22,138 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:22,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,284 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-14 21:44:22,284 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [374601156] [2019-10-14 21:44:22,285 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [400478910] [2019-10-14 21:44:22,285 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:22,342 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:22,343 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:22,344 INFO L256 TraceCheckSpWp]: Trace formula consists of 160 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:44:22,346 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:22,365 INFO L134 CoverageAnalysis]: Checked inductivity of 164 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 128 trivial. 0 not checked. [2019-10-14 21:44:22,370 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:22,370 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:44:22,371 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255087755] [2019-10-14 21:44:22,371 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:44:22,372 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:22,372 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:44:22,372 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:22,372 INFO L87 Difference]: Start difference. First operand 62 states and 65 transitions. Second operand 13 states. [2019-10-14 21:44:22,492 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:22,492 INFO L93 Difference]: Finished difference Result 116 states and 124 transitions. [2019-10-14 21:44:22,492 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:44:22,493 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 57 [2019-10-14 21:44:22,493 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:22,494 INFO L225 Difference]: With dead ends: 116 [2019-10-14 21:44:22,494 INFO L226 Difference]: Without dead ends: 69 [2019-10-14 21:44:22,495 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 69 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:44:22,496 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2019-10-14 21:44:22,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 67. [2019-10-14 21:44:22,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2019-10-14 21:44:22,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2019-10-14 21:44:22,503 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 57 [2019-10-14 21:44:22,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:22,503 INFO L462 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2019-10-14 21:44:22,503 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:44:22,503 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2019-10-14 21:44:22,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2019-10-14 21:44:22,504 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:22,504 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:22,713 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:22,714 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:22,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:22,714 INFO L82 PathProgramCache]: Analyzing trace with hash -490630470, now seen corresponding path program 9 times [2019-10-14 21:44:22,715 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:22,715 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91529520] [2019-10-14 21:44:22,715 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:22,715 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:22,715 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:22,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:22,858 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:44:22,859 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91529520] [2019-10-14 21:44:22,859 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [86647197] [2019-10-14 21:44:22,859 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,059 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:44:23,060 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:23,061 INFO L256 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:44:23,064 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:23,085 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 162 trivial. 0 not checked. [2019-10-14 21:44:23,085 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:23,086 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:44:23,086 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321440741] [2019-10-14 21:44:23,086 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:44:23,087 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:23,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:44:23,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:44:23,087 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 14 states. [2019-10-14 21:44:23,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:23,289 INFO L93 Difference]: Finished difference Result 125 states and 133 transitions. [2019-10-14 21:44:23,290 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:44:23,290 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 62 [2019-10-14 21:44:23,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:23,291 INFO L225 Difference]: With dead ends: 125 [2019-10-14 21:44:23,291 INFO L226 Difference]: Without dead ends: 74 [2019-10-14 21:44:23,292 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:44:23,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2019-10-14 21:44:23,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 72. [2019-10-14 21:44:23,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2019-10-14 21:44:23,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 75 transitions. [2019-10-14 21:44:23,299 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 75 transitions. Word has length 62 [2019-10-14 21:44:23,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:23,300 INFO L462 AbstractCegarLoop]: Abstraction has 72 states and 75 transitions. [2019-10-14 21:44:23,300 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:44:23,300 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 75 transitions. [2019-10-14 21:44:23,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2019-10-14 21:44:23,301 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:23,301 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:23,507 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,507 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:23,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:23,508 INFO L82 PathProgramCache]: Analyzing trace with hash -1207107598, now seen corresponding path program 10 times [2019-10-14 21:44:23,508 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:23,509 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1428060337] [2019-10-14 21:44:23,509 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,509 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:23,509 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:23,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:23,661 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2019-10-14 21:44:23,661 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1428060337] [2019-10-14 21:44:23,662 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2296474] [2019-10-14 21:44:23,662 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:23,716 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:44:23,717 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:23,718 INFO L256 TraceCheckSpWp]: Trace formula consists of 184 conjuncts, 12 conjunts are in the unsatisfiable core [2019-10-14 21:44:23,720 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:23,748 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2019-10-14 21:44:23,748 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:23,749 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13] total 15 [2019-10-14 21:44:23,750 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213355281] [2019-10-14 21:44:23,750 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:44:23,752 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:23,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:44:23,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:23,754 INFO L87 Difference]: Start difference. First operand 72 states and 75 transitions. Second operand 15 states. [2019-10-14 21:44:23,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:23,912 INFO L93 Difference]: Finished difference Result 134 states and 142 transitions. [2019-10-14 21:44:23,912 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:44:23,913 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 67 [2019-10-14 21:44:23,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:23,914 INFO L225 Difference]: With dead ends: 134 [2019-10-14 21:44:23,914 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 21:44:23,915 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:44:23,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 21:44:23,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 77. [2019-10-14 21:44:23,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2019-10-14 21:44:23,927 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2019-10-14 21:44:23,927 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 67 [2019-10-14 21:44:23,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:23,931 INFO L462 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2019-10-14 21:44:23,931 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:44:23,932 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2019-10-14 21:44:23,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2019-10-14 21:44:23,933 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:23,938 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:24,142 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:24,143 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:24,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:24,143 INFO L82 PathProgramCache]: Analyzing trace with hash 2083114930, now seen corresponding path program 11 times [2019-10-14 21:44:24,144 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:24,144 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [194248822] [2019-10-14 21:44:24,144 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:24,145 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:24,145 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:24,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:24,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:24,350 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 242 trivial. 0 not checked. [2019-10-14 21:44:24,351 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [194248822] [2019-10-14 21:44:24,351 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995540483] [2019-10-14 21:44:24,352 INFO L92 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,186 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 12 check-sat command(s) [2019-10-14 21:44:44,187 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:44,206 INFO L256 TraceCheckSpWp]: Trace formula consists of 196 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:44:44,209 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:44,235 INFO L134 CoverageAnalysis]: Checked inductivity of 308 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2019-10-14 21:44:44,235 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:44,236 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:44:44,236 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1361221966] [2019-10-14 21:44:44,237 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:44:44,237 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:44,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:44:44,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:44,238 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 16 states. [2019-10-14 21:44:44,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:44,467 INFO L93 Difference]: Finished difference Result 143 states and 151 transitions. [2019-10-14 21:44:44,469 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:44:44,469 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 72 [2019-10-14 21:44:44,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:44,470 INFO L225 Difference]: With dead ends: 143 [2019-10-14 21:44:44,470 INFO L226 Difference]: Without dead ends: 84 [2019-10-14 21:44:44,471 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 73 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:44:44,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2019-10-14 21:44:44,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 82. [2019-10-14 21:44:44,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 21:44:44,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 85 transitions. [2019-10-14 21:44:44,489 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 85 transitions. Word has length 72 [2019-10-14 21:44:44,489 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:44,489 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 85 transitions. [2019-10-14 21:44:44,489 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:44:44,489 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 85 transitions. [2019-10-14 21:44:44,490 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-14 21:44:44,490 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:44,491 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:44,703 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:44,704 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:44,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:44,704 INFO L82 PathProgramCache]: Analyzing trace with hash 385857002, now seen corresponding path program 12 times [2019-10-14 21:44:44,705 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:44,705 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137123861] [2019-10-14 21:44:44,706 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,706 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:44,706 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:44,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:44,863 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 288 trivial. 0 not checked. [2019-10-14 21:44:44,863 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137123861] [2019-10-14 21:44:44,863 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1548076162] [2019-10-14 21:44:44,864 INFO L92 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:58,621 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 13 check-sat command(s) [2019-10-14 21:44:58,621 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:58,633 INFO L256 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:44:58,635 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:58,665 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2019-10-14 21:44:58,666 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:58,666 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:44:58,666 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823963790] [2019-10-14 21:44:58,667 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:44:58,668 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:58,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:44:58,668 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:44:58,669 INFO L87 Difference]: Start difference. First operand 82 states and 85 transitions. Second operand 17 states. [2019-10-14 21:44:58,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:58,826 INFO L93 Difference]: Finished difference Result 152 states and 160 transitions. [2019-10-14 21:44:58,826 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:44:58,826 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 77 [2019-10-14 21:44:58,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:58,827 INFO L225 Difference]: With dead ends: 152 [2019-10-14 21:44:58,827 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 21:44:58,828 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 78 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:44:58,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 21:44:58,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 87. [2019-10-14 21:44:58,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2019-10-14 21:44:58,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2019-10-14 21:44:58,842 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 77 [2019-10-14 21:44:58,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:58,842 INFO L462 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2019-10-14 21:44:58,842 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:44:58,843 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2019-10-14 21:44:58,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2019-10-14 21:44:58,846 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:58,846 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:59,047 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,047 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:59,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:59,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1239413930, now seen corresponding path program 13 times [2019-10-14 21:44:59,048 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:59,048 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212005540] [2019-10-14 21:44:59,048 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,048 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,049 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:59,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,244 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2019-10-14 21:44:59,244 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212005540] [2019-10-14 21:44:59,244 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [791493015] [2019-10-14 21:44:59,244 INFO L92 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,307 INFO L256 TraceCheckSpWp]: Trace formula consists of 220 conjuncts, 15 conjunts are in the unsatisfiable core [2019-10-14 21:44:59,309 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:59,353 INFO L134 CoverageAnalysis]: Checked inductivity of 429 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 338 trivial. 0 not checked. [2019-10-14 21:44:59,353 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:44:59,353 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 18 [2019-10-14 21:44:59,354 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66080100] [2019-10-14 21:44:59,355 INFO L442 AbstractCegarLoop]: Interpolant automaton has 18 states [2019-10-14 21:44:59,356 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:44:59,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2019-10-14 21:44:59,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:59,356 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 18 states. [2019-10-14 21:44:59,519 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:44:59,519 INFO L93 Difference]: Finished difference Result 161 states and 169 transitions. [2019-10-14 21:44:59,520 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2019-10-14 21:44:59,520 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 82 [2019-10-14 21:44:59,520 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:44:59,520 INFO L225 Difference]: With dead ends: 161 [2019-10-14 21:44:59,521 INFO L226 Difference]: Without dead ends: 94 [2019-10-14 21:44:59,521 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 83 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2019-10-14 21:44:59,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2019-10-14 21:44:59,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 92. [2019-10-14 21:44:59,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2019-10-14 21:44:59,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 95 transitions. [2019-10-14 21:44:59,527 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 95 transitions. Word has length 82 [2019-10-14 21:44:59,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:44:59,527 INFO L462 AbstractCegarLoop]: Abstraction has 92 states and 95 transitions. [2019-10-14 21:44:59,527 INFO L463 AbstractCegarLoop]: Interpolant automaton has 18 states. [2019-10-14 21:44:59,528 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 95 transitions. [2019-10-14 21:44:59,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 21:44:59,529 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:44:59,529 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:44:59,729 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,730 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:44:59,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:44:59,730 INFO L82 PathProgramCache]: Analyzing trace with hash -535424030, now seen corresponding path program 14 times [2019-10-14 21:44:59,730 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:44:59,730 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1879334065] [2019-10-14 21:44:59,730 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,731 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:44:59,731 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:44:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:44:59,911 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-14 21:44:59,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1879334065] [2019-10-14 21:44:59,911 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528519472] [2019-10-14 21:44:59,912 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:44:59,977 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:44:59,977 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:44:59,978 INFO L256 TraceCheckSpWp]: Trace formula consists of 232 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:44:59,980 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:44:59,999 INFO L134 CoverageAnalysis]: Checked inductivity of 497 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-14 21:45:00,003 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:00,004 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 17] total 19 [2019-10-14 21:45:00,004 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594821758] [2019-10-14 21:45:00,005 INFO L442 AbstractCegarLoop]: Interpolant automaton has 19 states [2019-10-14 21:45:00,005 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:00,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2019-10-14 21:45:00,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:45:00,006 INFO L87 Difference]: Start difference. First operand 92 states and 95 transitions. Second operand 19 states. [2019-10-14 21:45:00,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:00,284 INFO L93 Difference]: Finished difference Result 170 states and 178 transitions. [2019-10-14 21:45:00,285 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2019-10-14 21:45:00,285 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 87 [2019-10-14 21:45:00,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:00,287 INFO L225 Difference]: With dead ends: 170 [2019-10-14 21:45:00,287 INFO L226 Difference]: Without dead ends: 99 [2019-10-14 21:45:00,287 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2019-10-14 21:45:00,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2019-10-14 21:45:00,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 97. [2019-10-14 21:45:00,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2019-10-14 21:45:00,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2019-10-14 21:45:00,293 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 87 [2019-10-14 21:45:00,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:00,293 INFO L462 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2019-10-14 21:45:00,293 INFO L463 AbstractCegarLoop]: Interpolant automaton has 19 states. [2019-10-14 21:45:00,293 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2019-10-14 21:45:00,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2019-10-14 21:45:00,294 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:00,294 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:00,498 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:00,498 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:00,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:00,499 INFO L82 PathProgramCache]: Analyzing trace with hash -422313566, now seen corresponding path program 15 times [2019-10-14 21:45:00,499 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:00,499 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464574564] [2019-10-14 21:45:00,500 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:00,500 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:00,500 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:00,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:00,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:00,683 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2019-10-14 21:45:00,683 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464574564] [2019-10-14 21:45:00,684 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1028689472] [2019-10-14 21:45:00,684 INFO L92 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:03,034 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2019-10-14 21:45:03,035 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:03,039 INFO L256 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 32 conjunts are in the unsatisfiable core [2019-10-14 21:45:03,040 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:03,079 INFO L134 CoverageAnalysis]: Checked inductivity of 570 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 450 trivial. 0 not checked. [2019-10-14 21:45:03,079 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:03,080 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:45:03,080 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800431802] [2019-10-14 21:45:03,080 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:45:03,080 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:45:03,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:45:03,081 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 20 states. [2019-10-14 21:45:03,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:03,248 INFO L93 Difference]: Finished difference Result 179 states and 187 transitions. [2019-10-14 21:45:03,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:45:03,248 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 92 [2019-10-14 21:45:03,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:03,250 INFO L225 Difference]: With dead ends: 179 [2019-10-14 21:45:03,250 INFO L226 Difference]: Without dead ends: 104 [2019-10-14 21:45:03,251 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:45:03,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2019-10-14 21:45:03,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 102. [2019-10-14 21:45:03,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 102 states. [2019-10-14 21:45:03,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 105 transitions. [2019-10-14 21:45:03,256 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 105 transitions. Word has length 92 [2019-10-14 21:45:03,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:03,256 INFO L462 AbstractCegarLoop]: Abstraction has 102 states and 105 transitions. [2019-10-14 21:45:03,256 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:45:03,256 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 105 transitions. [2019-10-14 21:45:03,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2019-10-14 21:45:03,257 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:03,257 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:03,469 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:03,470 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:03,470 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:03,471 INFO L82 PathProgramCache]: Analyzing trace with hash -1861215782, now seen corresponding path program 16 times [2019-10-14 21:45:03,471 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:03,471 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [118328938] [2019-10-14 21:45:03,471 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,472 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:03,472 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:03,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:03,704 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 512 trivial. 0 not checked. [2019-10-14 21:45:03,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [118328938] [2019-10-14 21:45:03,705 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1643521205] [2019-10-14 21:45:03,705 INFO L92 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:03,779 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:45:03,780 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:45:03,781 INFO L256 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 18 conjunts are in the unsatisfiable core [2019-10-14 21:45:03,783 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:45:03,810 INFO L134 CoverageAnalysis]: Checked inductivity of 648 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2019-10-14 21:45:03,811 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:45:03,811 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 19] total 21 [2019-10-14 21:45:03,811 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [496508090] [2019-10-14 21:45:03,812 INFO L442 AbstractCegarLoop]: Interpolant automaton has 21 states [2019-10-14 21:45:03,812 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:45:03,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2019-10-14 21:45:03,813 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:45:03,814 INFO L87 Difference]: Start difference. First operand 102 states and 105 transitions. Second operand 21 states. [2019-10-14 21:45:04,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:45:04,056 INFO L93 Difference]: Finished difference Result 188 states and 196 transitions. [2019-10-14 21:45:04,057 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:45:04,057 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 97 [2019-10-14 21:45:04,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:45:04,058 INFO L225 Difference]: With dead ends: 188 [2019-10-14 21:45:04,058 INFO L226 Difference]: Without dead ends: 109 [2019-10-14 21:45:04,059 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2019-10-14 21:45:04,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2019-10-14 21:45:04,064 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 107. [2019-10-14 21:45:04,064 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2019-10-14 21:45:04,065 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2019-10-14 21:45:04,066 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 97 [2019-10-14 21:45:04,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:45:04,066 INFO L462 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2019-10-14 21:45:04,066 INFO L463 AbstractCegarLoop]: Interpolant automaton has 21 states. [2019-10-14 21:45:04,066 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2019-10-14 21:45:04,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2019-10-14 21:45:04,068 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:45:04,068 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:45:04,268 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:45:04,269 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:45:04,269 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:45:04,269 INFO L82 PathProgramCache]: Analyzing trace with hash 1207301786, now seen corresponding path program 17 times [2019-10-14 21:45:04,269 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:45:04,269 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673240784] [2019-10-14 21:45:04,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,270 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:45:04,270 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:45:04,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:45:04,496 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 0 proven. 153 refuted. 0 times theorem prover too weak. 578 trivial. 0 not checked. [2019-10-14 21:45:04,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673240784] [2019-10-14 21:45:04,497 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1294058364] [2019-10-14 21:45:04,497 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