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_vararg_ground.i -------------------------------------------------------------------------------- This is Ultimate 0.1.24-13a467a-m [2019-10-14 21:47:04,017 INFO L177 SettingsManager]: Resetting all preferences to default values... [2019-10-14 21:47:04,019 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2019-10-14 21:47:04,031 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2019-10-14 21:47:04,032 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2019-10-14 21:47:04,033 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2019-10-14 21:47:04,034 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2019-10-14 21:47:04,036 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2019-10-14 21:47:04,037 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2019-10-14 21:47:04,038 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2019-10-14 21:47:04,039 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2019-10-14 21:47:04,040 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2019-10-14 21:47:04,041 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2019-10-14 21:47:04,042 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2019-10-14 21:47:04,043 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2019-10-14 21:47:04,044 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2019-10-14 21:47:04,045 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2019-10-14 21:47:04,045 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2019-10-14 21:47:04,047 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2019-10-14 21:47:04,049 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2019-10-14 21:47:04,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2019-10-14 21:47:04,051 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2019-10-14 21:47:04,052 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2019-10-14 21:47:04,053 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2019-10-14 21:47:04,055 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2019-10-14 21:47:04,058 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2019-10-14 21:47:04,059 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2019-10-14 21:47:04,059 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2019-10-14 21:47:04,060 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2019-10-14 21:47:04,061 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2019-10-14 21:47:04,061 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2019-10-14 21:47:04,062 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2019-10-14 21:47:04,062 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2019-10-14 21:47:04,062 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2019-10-14 21:47:04,063 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2019-10-14 21:47:04,064 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2019-10-14 21:47:04,064 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 21:47:04,077 INFO L113 SettingsManager]: Loading preferences was successful [2019-10-14 21:47:04,078 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2019-10-14 21:47:04,079 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2019-10-14 21:47:04,079 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2019-10-14 21:47:04,079 INFO L138 SettingsManager]: * Use SBE=true [2019-10-14 21:47:04,080 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2019-10-14 21:47:04,080 INFO L138 SettingsManager]: * sizeof long=4 [2019-10-14 21:47:04,080 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2019-10-14 21:47:04,080 INFO L138 SettingsManager]: * sizeof POINTER=4 [2019-10-14 21:47:04,080 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2019-10-14 21:47:04,080 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2019-10-14 21:47:04,081 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2019-10-14 21:47:04,081 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2019-10-14 21:47:04,081 INFO L138 SettingsManager]: * sizeof long double=12 [2019-10-14 21:47:04,081 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2019-10-14 21:47:04,081 INFO L138 SettingsManager]: * Use constant arrays=true [2019-10-14 21:47:04,082 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2019-10-14 21:47:04,082 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2019-10-14 21:47:04,082 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2019-10-14 21:47:04,082 INFO L138 SettingsManager]: * To the following directory=./dump/ [2019-10-14 21:47:04,082 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2019-10-14 21:47:04,083 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2019-10-14 21:47:04,083 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2019-10-14 21:47:04,083 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2019-10-14 21:47:04,083 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2019-10-14 21:47:04,083 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2019-10-14 21:47:04,084 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2019-10-14 21:47:04,084 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2019-10-14 21:47:04,084 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2019-10-14 21:47:04,364 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2019-10-14 21:47:04,377 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2019-10-14 21:47:04,381 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2019-10-14 21:47:04,382 INFO L271 PluginConnector]: Initializing CDTParser... [2019-10-14 21:47:04,382 INFO L275 PluginConnector]: CDTParser initialized [2019-10-14 21:47:04,383 INFO L428 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-examples/standard_vararg_ground.i [2019-10-14 21:47:04,453 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462fcccf/def0e54c506143efbf9152a670804c96/FLAG080fd74bc [2019-10-14 21:47:04,905 INFO L306 CDTParser]: Found 1 translation units. [2019-10-14 21:47:04,906 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/array-examples/standard_vararg_ground.i [2019-10-14 21:47:04,910 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462fcccf/def0e54c506143efbf9152a670804c96/FLAG080fd74bc [2019-10-14 21:47:05,268 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/4462fcccf/def0e54c506143efbf9152a670804c96 [2019-10-14 21:47:05,277 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2019-10-14 21:47:05,279 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2019-10-14 21:47:05,280 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:05,280 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2019-10-14 21:47:05,284 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2019-10-14 21:47:05,285 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,288 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7d836b77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05, skipping insertion in model container [2019-10-14 21:47:05,288 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,296 INFO L142 MainTranslator]: Starting translation in SV-COMP mode [2019-10-14 21:47:05,314 INFO L173 MainTranslator]: Built tables and reachable declarations [2019-10-14 21:47:05,470 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:05,474 INFO L188 MainTranslator]: Completed pre-run [2019-10-14 21:47:05,495 INFO L206 PostProcessor]: Analyzing one entry point: main [2019-10-14 21:47:05,515 INFO L192 MainTranslator]: Completed translation [2019-10-14 21:47:05,515 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05 WrapperNode [2019-10-14 21:47:05,515 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2019-10-14 21:47:05,516 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2019-10-14 21:47:05,516 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2019-10-14 21:47:05,516 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2019-10-14 21:47:05,611 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,612 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,620 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,620 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,627 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,632 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,633 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (1/1) ... [2019-10-14 21:47:05,635 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2019-10-14 21:47:05,636 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2019-10-14 21:47:05,636 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2019-10-14 21:47:05,636 INFO L275 PluginConnector]: RCFGBuilder initialized [2019-10-14 21:47:05,637 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (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 21:47:05,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2019-10-14 21:47:05,704 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2019-10-14 21:47:05,704 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2019-10-14 21:47:05,704 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2019-10-14 21:47:05,704 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure main [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2019-10-14 21:47:05,705 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2019-10-14 21:47:05,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2019-10-14 21:47:05,706 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2019-10-14 21:47:06,026 INFO L279 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2019-10-14 21:47:06,026 INFO L284 CfgBuilder]: Removed 3 assume(true) statements. [2019-10-14 21:47:06,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:06 BoogieIcfgContainer [2019-10-14 21:47:06,028 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2019-10-14 21:47:06,028 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2019-10-14 21:47:06,029 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2019-10-14 21:47:06,031 INFO L275 PluginConnector]: TraceAbstraction initialized [2019-10-14 21:47:06,031 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 14.10 09:47:05" (1/3) ... [2019-10-14 21:47:06,032 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e5adac9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:06, skipping insertion in model container [2019-10-14 21:47:06,032 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 14.10 09:47:05" (2/3) ... [2019-10-14 21:47:06,033 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e5adac9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 14.10 09:47:06, skipping insertion in model container [2019-10-14 21:47:06,033 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 14.10 09:47:06" (3/3) ... [2019-10-14 21:47:06,034 INFO L109 eAbstractionObserver]: Analyzing ICFG standard_vararg_ground.i [2019-10-14 21:47:06,042 INFO L152 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2019-10-14 21:47:06,049 INFO L164 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2019-10-14 21:47:06,060 INFO L249 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2019-10-14 21:47:06,085 INFO L373 AbstractCegarLoop]: Interprodecural is true [2019-10-14 21:47:06,085 INFO L374 AbstractCegarLoop]: Hoare is true [2019-10-14 21:47:06,085 INFO L375 AbstractCegarLoop]: Compute interpolants for FPandBP [2019-10-14 21:47:06,085 INFO L376 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2019-10-14 21:47:06,085 INFO L377 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2019-10-14 21:47:06,086 INFO L378 AbstractCegarLoop]: Difference is false [2019-10-14 21:47:06,086 INFO L379 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2019-10-14 21:47:06,086 INFO L383 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2019-10-14 21:47:06,103 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states. [2019-10-14 21:47:06,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2019-10-14 21:47:06,108 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:06,109 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:06,111 INFO L410 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:06,116 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:06,117 INFO L82 PathProgramCache]: Analyzing trace with hash -161951569, now seen corresponding path program 1 times [2019-10-14 21:47:06,125 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:06,126 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [551561872] [2019-10-14 21:47:06,126 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,126 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,126 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:06,208 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,294 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 21:47:06,295 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [551561872] [2019-10-14 21:47:06,296 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:06,296 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2019-10-14 21:47:06,297 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128885978] [2019-10-14 21:47:06,300 INFO L442 AbstractCegarLoop]: Interpolant automaton has 3 states [2019-10-14 21:47:06,301 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:06,310 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2019-10-14 21:47:06,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2019-10-14 21:47:06,313 INFO L87 Difference]: Start difference. First operand 26 states. Second operand 3 states. [2019-10-14 21:47:06,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:06,400 INFO L93 Difference]: Finished difference Result 44 states and 55 transitions. [2019-10-14 21:47:06,400 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2019-10-14 21:47:06,402 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2019-10-14 21:47:06,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:06,412 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:47:06,412 INFO L226 Difference]: Without dead ends: 21 [2019-10-14 21:47:06,417 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 21:47:06,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2019-10-14 21:47:06,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2019-10-14 21:47:06,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2019-10-14 21:47:06,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2019-10-14 21:47:06,455 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 14 [2019-10-14 21:47:06,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:06,455 INFO L462 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2019-10-14 21:47:06,455 INFO L463 AbstractCegarLoop]: Interpolant automaton has 3 states. [2019-10-14 21:47:06,456 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2019-10-14 21:47:06,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2019-10-14 21:47:06,456 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:06,457 INFO L380 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:06,457 INFO L410 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:06,457 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:06,458 INFO L82 PathProgramCache]: Analyzing trace with hash 932758337, now seen corresponding path program 1 times [2019-10-14 21:47:06,458 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:06,458 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464184201] [2019-10-14 21:47:06,459 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,459 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,459 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:06,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,551 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 21:47:06,552 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464184201] [2019-10-14 21:47:06,552 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2019-10-14 21:47:06,552 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2019-10-14 21:47:06,553 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384930803] [2019-10-14 21:47:06,554 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:06,555 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:06,555 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:06,556 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2019-10-14 21:47:06,557 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2019-10-14 21:47:06,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:06,620 INFO L93 Difference]: Finished difference Result 36 states and 40 transitions. [2019-10-14 21:47:06,621 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:06,621 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2019-10-14 21:47:06,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:06,622 INFO L225 Difference]: With dead ends: 36 [2019-10-14 21:47:06,623 INFO L226 Difference]: Without dead ends: 23 [2019-10-14 21:47:06,624 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 21:47:06,624 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2019-10-14 21:47:06,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2019-10-14 21:47:06,629 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2019-10-14 21:47:06,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2019-10-14 21:47:06,633 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 15 [2019-10-14 21:47:06,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:06,634 INFO L462 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2019-10-14 21:47:06,634 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:06,634 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2019-10-14 21:47:06,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2019-10-14 21:47:06,635 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:06,635 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 21:47:06,636 INFO L410 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:06,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:06,636 INFO L82 PathProgramCache]: Analyzing trace with hash 1344598495, now seen corresponding path program 1 times [2019-10-14 21:47:06,637 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:06,637 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988389363] [2019-10-14 21:47:06,637 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,637 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:06,638 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:06,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:06,726 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988389363] [2019-10-14 21:47:06,727 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [984821738] [2019-10-14 21:47:06,727 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 21:47:06,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:06,800 INFO L256 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:47:06,806 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:06,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:06,845 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:06,845 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 4] total 6 [2019-10-14 21:47:06,846 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1712926912] [2019-10-14 21:47:06,846 INFO L442 AbstractCegarLoop]: Interpolant automaton has 6 states [2019-10-14 21:47:06,846 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:06,847 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2019-10-14 21:47:06,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:06,847 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 6 states. [2019-10-14 21:47:06,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:06,935 INFO L93 Difference]: Finished difference Result 38 states and 42 transitions. [2019-10-14 21:47:06,936 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2019-10-14 21:47:06,936 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 17 [2019-10-14 21:47:06,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:06,937 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:47:06,938 INFO L226 Difference]: Without dead ends: 25 [2019-10-14 21:47:06,940 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2019-10-14 21:47:06,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2019-10-14 21:47:06,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 24. [2019-10-14 21:47:06,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2019-10-14 21:47:06,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2019-10-14 21:47:06,954 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 17 [2019-10-14 21:47:06,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:06,956 INFO L462 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2019-10-14 21:47:06,956 INFO L463 AbstractCegarLoop]: Interpolant automaton has 6 states. [2019-10-14 21:47:06,956 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2019-10-14 21:47:06,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2019-10-14 21:47:06,957 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:06,958 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:07,168 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:07,168 INFO L410 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:07,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:07,169 INFO L82 PathProgramCache]: Analyzing trace with hash 1985999101, now seen corresponding path program 2 times [2019-10-14 21:47:07,170 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:07,171 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1040315660] [2019-10-14 21:47:07,171 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,171 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,172 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:07,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,276 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2019-10-14 21:47:07,277 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1040315660] [2019-10-14 21:47:07,278 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991099173] [2019-10-14 21:47:07,278 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 21:47:07,326 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2019-10-14 21:47:07,326 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:07,327 INFO L256 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2019-10-14 21:47:07,332 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:07,366 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:47:07,367 INFO L223 tionRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2019-10-14 21:47:07,367 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2019-10-14 21:47:07,368 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1173186298] [2019-10-14 21:47:07,368 INFO L442 AbstractCegarLoop]: Interpolant automaton has 4 states [2019-10-14 21:47:07,368 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:07,380 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2019-10-14 21:47:07,388 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:07,388 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 4 states. [2019-10-14 21:47:07,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:07,409 INFO L93 Difference]: Finished difference Result 38 states and 41 transitions. [2019-10-14 21:47:07,409 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2019-10-14 21:47:07,409 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 19 [2019-10-14 21:47:07,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:07,410 INFO L225 Difference]: With dead ends: 38 [2019-10-14 21:47:07,410 INFO L226 Difference]: Without dead ends: 26 [2019-10-14 21:47:07,411 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:07,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2019-10-14 21:47:07,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2019-10-14 21:47:07,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2019-10-14 21:47:07,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2019-10-14 21:47:07,416 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 19 [2019-10-14 21:47:07,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:07,416 INFO L462 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2019-10-14 21:47:07,416 INFO L463 AbstractCegarLoop]: Interpolant automaton has 4 states. [2019-10-14 21:47:07,417 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2019-10-14 21:47:07,417 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2019-10-14 21:47:07,417 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:07,418 INFO L380 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:07,626 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:07,626 INFO L410 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:07,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:07,627 INFO L82 PathProgramCache]: Analyzing trace with hash -1034468606, now seen corresponding path program 1 times [2019-10-14 21:47:07,627 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:07,627 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [842474543] [2019-10-14 21:47:07,627 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,628 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:07,628 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:07,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,720 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:07,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [842474543] [2019-10-14 21:47:07,721 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757455983] [2019-10-14 21:47:07,721 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:47:07,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:07,770 INFO L256 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 4 conjunts are in the unsatisfiable core [2019-10-14 21:47:07,772 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:07,788 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:07,791 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:07,791 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5] total 7 [2019-10-14 21:47:07,791 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849566837] [2019-10-14 21:47:07,792 INFO L442 AbstractCegarLoop]: Interpolant automaton has 7 states [2019-10-14 21:47:07,792 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:07,792 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2019-10-14 21:47:07,792 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2019-10-14 21:47:07,793 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 7 states. [2019-10-14 21:47:07,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:07,888 INFO L93 Difference]: Finished difference Result 44 states and 48 transitions. [2019-10-14 21:47:07,890 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2019-10-14 21:47:07,890 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2019-10-14 21:47:07,890 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:07,891 INFO L225 Difference]: With dead ends: 44 [2019-10-14 21:47:07,892 INFO L226 Difference]: Without dead ends: 29 [2019-10-14 21:47:07,893 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 22 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 21:47:07,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2019-10-14 21:47:07,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 28. [2019-10-14 21:47:07,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2019-10-14 21:47:07,903 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2019-10-14 21:47:07,903 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 21 [2019-10-14 21:47:07,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:07,903 INFO L462 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2019-10-14 21:47:07,903 INFO L463 AbstractCegarLoop]: Interpolant automaton has 7 states. [2019-10-14 21:47:07,903 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2019-10-14 21:47:07,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2019-10-14 21:47:07,907 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:07,907 INFO L380 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:08,111 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:08,112 INFO L410 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:08,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:08,113 INFO L82 PathProgramCache]: Analyzing trace with hash 1184989984, now seen corresponding path program 2 times [2019-10-14 21:47:08,113 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:08,113 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [431829990] [2019-10-14 21:47:08,114 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,114 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,114 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:08,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,185 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:08,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [431829990] [2019-10-14 21:47:08,185 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [183683523] [2019-10-14 21:47:08,185 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 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 21:47:08,232 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:08,232 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:08,233 INFO L256 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 5 conjunts are in the unsatisfiable core [2019-10-14 21:47:08,235 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:08,253 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:08,253 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:08,254 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6] total 8 [2019-10-14 21:47:08,254 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2036798868] [2019-10-14 21:47:08,254 INFO L442 AbstractCegarLoop]: Interpolant automaton has 8 states [2019-10-14 21:47:08,255 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:08,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2019-10-14 21:47:08,255 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2019-10-14 21:47:08,255 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 8 states. [2019-10-14 21:47:08,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:08,328 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2019-10-14 21:47:08,328 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2019-10-14 21:47:08,328 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2019-10-14 21:47:08,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:08,329 INFO L225 Difference]: With dead ends: 46 [2019-10-14 21:47:08,329 INFO L226 Difference]: Without dead ends: 31 [2019-10-14 21:47:08,330 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 24 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 21:47:08,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2019-10-14 21:47:08,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 30. [2019-10-14 21:47:08,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2019-10-14 21:47:08,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2019-10-14 21:47:08,340 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 23 [2019-10-14 21:47:08,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:08,341 INFO L462 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2019-10-14 21:47:08,341 INFO L463 AbstractCegarLoop]: Interpolant automaton has 8 states. [2019-10-14 21:47:08,341 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2019-10-14 21:47:08,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2019-10-14 21:47:08,342 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:08,342 INFO L380 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:08,552 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:08,553 INFO L410 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:08,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:08,553 INFO L82 PathProgramCache]: Analyzing trace with hash -514051138, now seen corresponding path program 3 times [2019-10-14 21:47:08,553 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:08,553 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [340718423] [2019-10-14 21:47:08,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,554 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:08,554 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:08,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:08,656 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2019-10-14 21:47:08,661 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [340718423] [2019-10-14 21:47:08,662 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404482803] [2019-10-14 21:47:08,662 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 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 21:47:08,702 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2019-10-14 21:47:08,703 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:08,704 INFO L256 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:47:08,707 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:08,834 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-14 21:47:08,836 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:08,839 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:08,840 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:08,840 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-14 21:47:08,855 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:47:08,893 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2019-10-14 21:47:08,895 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:08,895 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 15 [2019-10-14 21:47:08,896 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1838742359] [2019-10-14 21:47:08,896 INFO L442 AbstractCegarLoop]: Interpolant automaton has 15 states [2019-10-14 21:47:08,896 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:08,897 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2019-10-14 21:47:08,897 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2019-10-14 21:47:08,897 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 15 states. [2019-10-14 21:47:09,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:09,248 INFO L93 Difference]: Finished difference Result 56 states and 61 transitions. [2019-10-14 21:47:09,248 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:47:09,248 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 25 [2019-10-14 21:47:09,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:09,249 INFO L225 Difference]: With dead ends: 56 [2019-10-14 21:47:09,249 INFO L226 Difference]: Without dead ends: 41 [2019-10-14 21:47:09,250 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2019-10-14 21:47:09,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-14 21:47:09,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2019-10-14 21:47:09,256 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2019-10-14 21:47:09,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2019-10-14 21:47:09,257 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 25 [2019-10-14 21:47:09,257 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:09,258 INFO L462 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2019-10-14 21:47:09,258 INFO L463 AbstractCegarLoop]: Interpolant automaton has 15 states. [2019-10-14 21:47:09,258 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2019-10-14 21:47:09,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2019-10-14 21:47:09,259 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:09,259 INFO L380 BasicCegarLoop]: trace histogram [5, 5, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:09,462 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:09,463 INFO L410 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:09,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:09,463 INFO L82 PathProgramCache]: Analyzing trace with hash 1543350547, now seen corresponding path program 1 times [2019-10-14 21:47:09,464 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:09,464 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2016300188] [2019-10-14 21:47:09,465 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,465 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,465 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:09,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:09,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:09,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:09,546 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2019-10-14 21:47:09,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2016300188] [2019-10-14 21:47:09,547 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1360404036] [2019-10-14 21:47:09,547 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 21:47:09,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:09,588 INFO L256 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:47:09,590 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:09,612 INFO L134 CoverageAnalysis]: Checked inductivity of 31 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:47:09,613 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:09,613 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 10 [2019-10-14 21:47:09,613 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [613803917] [2019-10-14 21:47:09,615 INFO L442 AbstractCegarLoop]: Interpolant automaton has 10 states [2019-10-14 21:47:09,618 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:09,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2019-10-14 21:47:09,619 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2019-10-14 21:47:09,619 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 10 states. [2019-10-14 21:47:09,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:09,709 INFO L93 Difference]: Finished difference Result 62 states and 66 transitions. [2019-10-14 21:47:09,709 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2019-10-14 21:47:09,709 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 35 [2019-10-14 21:47:09,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:09,712 INFO L225 Difference]: With dead ends: 62 [2019-10-14 21:47:09,712 INFO L226 Difference]: Without dead ends: 41 [2019-10-14 21:47:09,714 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 38 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 21:47:09,715 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2019-10-14 21:47:09,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 40. [2019-10-14 21:47:09,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2019-10-14 21:47:09,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2019-10-14 21:47:09,721 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 35 [2019-10-14 21:47:09,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:09,722 INFO L462 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2019-10-14 21:47:09,722 INFO L463 AbstractCegarLoop]: Interpolant automaton has 10 states. [2019-10-14 21:47:09,722 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2019-10-14 21:47:09,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2019-10-14 21:47:09,724 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:09,724 INFO L380 BasicCegarLoop]: trace histogram [6, 6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:09,924 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:09,925 INFO L410 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:09,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:09,926 INFO L82 PathProgramCache]: Analyzing trace with hash -116499279, now seen corresponding path program 2 times [2019-10-14 21:47:09,926 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:09,927 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949005131] [2019-10-14 21:47:09,927 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,927 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:09,928 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:09,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,055 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2019-10-14 21:47:10,056 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949005131] [2019-10-14 21:47:10,056 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828725666] [2019-10-14 21:47:10,056 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 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 21:47:10,106 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:10,106 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:10,107 INFO L256 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 8 conjunts are in the unsatisfiable core [2019-10-14 21:47:10,116 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:10,214 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2019-10-14 21:47:10,214 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:10,214 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 14 [2019-10-14 21:47:10,215 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585055857] [2019-10-14 21:47:10,215 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:47:10,215 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:10,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:47:10,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=134, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:10,216 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 14 states. [2019-10-14 21:47:10,420 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:10,420 INFO L93 Difference]: Finished difference Result 72 states and 78 transitions. [2019-10-14 21:47:10,421 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2019-10-14 21:47:10,421 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 37 [2019-10-14 21:47:10,421 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:10,422 INFO L225 Difference]: With dead ends: 72 [2019-10-14 21:47:10,422 INFO L226 Difference]: Without dead ends: 45 [2019-10-14 21:47:10,423 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=129, Invalid=333, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:47:10,423 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2019-10-14 21:47:10,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 44. [2019-10-14 21:47:10,432 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2019-10-14 21:47:10,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2019-10-14 21:47:10,433 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 37 [2019-10-14 21:47:10,433 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:10,433 INFO L462 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2019-10-14 21:47:10,434 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:47:10,434 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2019-10-14 21:47:10,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2019-10-14 21:47:10,435 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:10,435 INFO L380 BasicCegarLoop]: trace histogram [7, 7, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:10,646 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:10,647 INFO L410 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:10,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:10,647 INFO L82 PathProgramCache]: Analyzing trace with hash 601056020, now seen corresponding path program 3 times [2019-10-14 21:47:10,647 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:10,648 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166267981] [2019-10-14 21:47:10,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:10,648 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:10,648 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:10,669 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:10,773 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2019-10-14 21:47:10,778 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166267981] [2019-10-14 21:47:10,778 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825333879] [2019-10-14 21:47:10,779 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 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 21:47:10,833 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2019-10-14 21:47:10,833 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:10,835 INFO L256 TraceCheckSpWp]: Trace formula consists of 94 conjuncts, 26 conjunts are in the unsatisfiable core [2019-10-14 21:47:10,839 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:11,060 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-14 21:47:11,060 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:11,062 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:11,062 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:11,063 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-14 21:47:11,076 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:47:11,111 INFO L134 CoverageAnalysis]: Checked inductivity of 59 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2019-10-14 21:47:11,112 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:11,112 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 14] total 23 [2019-10-14 21:47:11,112 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1047866108] [2019-10-14 21:47:11,113 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:47:11,113 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:11,113 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:47:11,113 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=428, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:47:11,114 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 23 states. [2019-10-14 21:47:21,947 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:21,948 INFO L93 Difference]: Finished difference Result 80 states and 85 transitions. [2019-10-14 21:47:21,948 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2019-10-14 21:47:21,948 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 41 [2019-10-14 21:47:21,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:21,949 INFO L225 Difference]: With dead ends: 80 [2019-10-14 21:47:21,949 INFO L226 Difference]: Without dead ends: 57 [2019-10-14 21:47:21,951 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 297 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=226, Invalid=1334, Unknown=0, NotChecked=0, Total=1560 [2019-10-14 21:47:21,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-14 21:47:21,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2019-10-14 21:47:21,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2019-10-14 21:47:21,958 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2019-10-14 21:47:21,958 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 41 [2019-10-14 21:47:21,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:21,959 INFO L462 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2019-10-14 21:47:21,959 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:47:21,959 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2019-10-14 21:47:21,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2019-10-14 21:47:21,960 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:21,961 INFO L380 BasicCegarLoop]: trace histogram [8, 8, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:22,164 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:22,164 INFO L410 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:22,165 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:22,165 INFO L82 PathProgramCache]: Analyzing trace with hash -564844951, now seen corresponding path program 4 times [2019-10-14 21:47:22,166 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:22,166 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1480634240] [2019-10-14 21:47:22,166 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:22,167 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:22,167 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:22,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,287 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,291 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 4 proven. 64 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:47:22,292 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1480634240] [2019-10-14 21:47:22,292 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [528136974] [2019-10-14 21:47:22,292 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 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 21:47:22,354 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:22,355 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:22,355 INFO L256 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 10 conjunts are in the unsatisfiable core [2019-10-14 21:47:22,358 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:22,376 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-14 21:47:22,376 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:22,376 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 11] total 13 [2019-10-14 21:47:22,376 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462891439] [2019-10-14 21:47:22,377 INFO L442 AbstractCegarLoop]: Interpolant automaton has 13 states [2019-10-14 21:47:22,377 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:22,377 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2019-10-14 21:47:22,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2019-10-14 21:47:22,378 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 13 states. [2019-10-14 21:47:22,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:22,465 INFO L93 Difference]: Finished difference Result 88 states and 92 transitions. [2019-10-14 21:47:22,465 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2019-10-14 21:47:22,466 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 51 [2019-10-14 21:47:22,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:22,466 INFO L225 Difference]: With dead ends: 88 [2019-10-14 21:47:22,467 INFO L226 Difference]: Without dead ends: 57 [2019-10-14 21:47:22,467 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 56 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 21:47:22,468 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2019-10-14 21:47:22,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 56. [2019-10-14 21:47:22,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2019-10-14 21:47:22,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2019-10-14 21:47:22,481 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 51 [2019-10-14 21:47:22,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:22,481 INFO L462 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2019-10-14 21:47:22,481 INFO L463 AbstractCegarLoop]: Interpolant automaton has 13 states. [2019-10-14 21:47:22,481 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2019-10-14 21:47:22,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2019-10-14 21:47:22,482 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:22,485 INFO L380 BasicCegarLoop]: trace histogram [9, 9, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:22,691 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:22,692 INFO L410 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:22,692 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:22,692 INFO L82 PathProgramCache]: Analyzing trace with hash -361308665, now seen corresponding path program 5 times [2019-10-14 21:47:22,692 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:22,692 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1047748679] [2019-10-14 21:47:22,692 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:22,693 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:22,693 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:22,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:22,815 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 4 proven. 81 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:47:22,816 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1047748679] [2019-10-14 21:47:22,816 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [42927411] [2019-10-14 21:47:22,816 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 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 21:47:22,926 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 10 check-sat command(s) [2019-10-14 21:47:22,926 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:22,928 INFO L256 TraceCheckSpWp]: Trace formula consists of 151 conjuncts, 11 conjunts are in the unsatisfiable core [2019-10-14 21:47:22,935 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:22,967 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2019-10-14 21:47:22,968 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:22,968 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12] total 14 [2019-10-14 21:47:22,968 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1567879700] [2019-10-14 21:47:22,969 INFO L442 AbstractCegarLoop]: Interpolant automaton has 14 states [2019-10-14 21:47:22,972 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:22,973 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2019-10-14 21:47:22,973 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:22,973 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 14 states. [2019-10-14 21:47:23,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:23,072 INFO L93 Difference]: Finished difference Result 90 states and 94 transitions. [2019-10-14 21:47:23,073 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2019-10-14 21:47:23,073 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 53 [2019-10-14 21:47:23,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:23,074 INFO L225 Difference]: With dead ends: 90 [2019-10-14 21:47:23,074 INFO L226 Difference]: Without dead ends: 59 [2019-10-14 21:47:23,075 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 58 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2019-10-14 21:47:23,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2019-10-14 21:47:23,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 58. [2019-10-14 21:47:23,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2019-10-14 21:47:23,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2019-10-14 21:47:23,092 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 53 [2019-10-14 21:47:23,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:23,094 INFO L462 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2019-10-14 21:47:23,094 INFO L463 AbstractCegarLoop]: Interpolant automaton has 14 states. [2019-10-14 21:47:23,094 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2019-10-14 21:47:23,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2019-10-14 21:47:23,095 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:23,096 INFO L380 BasicCegarLoop]: trace histogram [10, 10, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:23,303 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:23,303 INFO L410 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:23,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:23,304 INFO L82 PathProgramCache]: Analyzing trace with hash 1963533861, now seen corresponding path program 6 times [2019-10-14 21:47:23,304 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:23,304 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [56517196] [2019-10-14 21:47:23,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:23,304 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:23,305 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:23,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:23,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:23,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:23,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:23,469 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 4 proven. 100 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2019-10-14 21:47:23,470 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [56517196] [2019-10-14 21:47:23,470 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2106362177] [2019-10-14 21:47:23,470 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 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 21:47:23,514 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 5 check-sat command(s) [2019-10-14 21:47:23,514 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:23,515 INFO L256 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 7 conjunts are in the unsatisfiable core [2019-10-14 21:47:23,516 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:23,625 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 12 proven. 6 refuted. 0 times theorem prover too weak. 104 trivial. 0 not checked. [2019-10-14 21:47:23,626 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:23,626 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 8] total 20 [2019-10-14 21:47:23,626 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943525862] [2019-10-14 21:47:23,626 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:47:23,627 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:23,627 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:47:23,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=279, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:23,627 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 20 states. [2019-10-14 21:47:23,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:23,976 INFO L93 Difference]: Finished difference Result 104 states and 111 transitions. [2019-10-14 21:47:23,977 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2019-10-14 21:47:23,977 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 55 [2019-10-14 21:47:23,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:23,978 INFO L225 Difference]: With dead ends: 104 [2019-10-14 21:47:23,979 INFO L226 Difference]: Without dead ends: 63 [2019-10-14 21:47:23,980 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=277, Invalid=653, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:47:23,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2019-10-14 21:47:23,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2019-10-14 21:47:23,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2019-10-14 21:47:23,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2019-10-14 21:47:23,988 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 55 [2019-10-14 21:47:23,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:23,989 INFO L462 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2019-10-14 21:47:23,989 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:47:23,989 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2019-10-14 21:47:23,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2019-10-14 21:47:23,990 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:23,990 INFO L380 BasicCegarLoop]: trace histogram [11, 11, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:24,193 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:24,194 INFO L410 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:24,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:24,195 INFO L82 PathProgramCache]: Analyzing trace with hash -35368760, now seen corresponding path program 7 times [2019-10-14 21:47:24,195 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:24,195 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2047221290] [2019-10-14 21:47:24,195 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:24,196 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:24,196 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:24,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,315 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 4 proven. 121 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-14 21:47:24,315 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2047221290] [2019-10-14 21:47:24,315 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36428774] [2019-10-14 21:47:24,316 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 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 21:47:24,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,363 INFO L256 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 13 conjunts are in the unsatisfiable core [2019-10-14 21:47:24,365 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:24,385 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-14 21:47:24,386 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:24,386 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 16 [2019-10-14 21:47:24,386 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92938364] [2019-10-14 21:47:24,386 INFO L442 AbstractCegarLoop]: Interpolant automaton has 16 states [2019-10-14 21:47:24,387 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:24,387 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2019-10-14 21:47:24,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:47:24,387 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 16 states. [2019-10-14 21:47:24,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:24,501 INFO L93 Difference]: Finished difference Result 98 states and 102 transitions. [2019-10-14 21:47:24,501 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2019-10-14 21:47:24,501 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 59 [2019-10-14 21:47:24,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:24,503 INFO L225 Difference]: With dead ends: 98 [2019-10-14 21:47:24,503 INFO L226 Difference]: Without dead ends: 65 [2019-10-14 21:47:24,504 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 64 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2019-10-14 21:47:24,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2019-10-14 21:47:24,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 64. [2019-10-14 21:47:24,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2019-10-14 21:47:24,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2019-10-14 21:47:24,511 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 59 [2019-10-14 21:47:24,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:24,511 INFO L462 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2019-10-14 21:47:24,511 INFO L463 AbstractCegarLoop]: Interpolant automaton has 16 states. [2019-10-14 21:47:24,512 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2019-10-14 21:47:24,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2019-10-14 21:47:24,513 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:24,513 INFO L380 BasicCegarLoop]: trace histogram [12, 12, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:24,715 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:24,716 INFO L410 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:24,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:24,717 INFO L82 PathProgramCache]: Analyzing trace with hash -962885018, now seen corresponding path program 8 times [2019-10-14 21:47:24,717 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:24,717 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [337019207] [2019-10-14 21:47:24,717 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:24,718 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:24,718 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:24,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:24,876 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 4 proven. 144 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-14 21:47:24,877 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [337019207] [2019-10-14 21:47:24,877 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1119459555] [2019-10-14 21:47:24,877 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 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 21:47:24,933 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:24,934 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:24,935 INFO L256 TraceCheckSpWp]: Trace formula consists of 174 conjuncts, 14 conjunts are in the unsatisfiable core [2019-10-14 21:47:24,936 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:24,953 INFO L134 CoverageAnalysis]: Checked inductivity of 172 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2019-10-14 21:47:24,954 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:24,954 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 15] total 17 [2019-10-14 21:47:24,954 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1244622836] [2019-10-14 21:47:24,955 INFO L442 AbstractCegarLoop]: Interpolant automaton has 17 states [2019-10-14 21:47:24,955 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:24,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2019-10-14 21:47:24,955 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2019-10-14 21:47:24,956 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 17 states. [2019-10-14 21:47:25,061 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:25,061 INFO L93 Difference]: Finished difference Result 100 states and 104 transitions. [2019-10-14 21:47:25,061 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2019-10-14 21:47:25,061 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 61 [2019-10-14 21:47:25,062 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:25,063 INFO L225 Difference]: With dead ends: 100 [2019-10-14 21:47:25,063 INFO L226 Difference]: Without dead ends: 67 [2019-10-14 21:47:25,064 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 66 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 21:47:25,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2019-10-14 21:47:25,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 66. [2019-10-14 21:47:25,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2019-10-14 21:47:25,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2019-10-14 21:47:25,071 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 61 [2019-10-14 21:47:25,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:25,071 INFO L462 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2019-10-14 21:47:25,071 INFO L463 AbstractCegarLoop]: Interpolant automaton has 17 states. [2019-10-14 21:47:25,071 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2019-10-14 21:47:25,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2019-10-14 21:47:25,072 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:25,072 INFO L380 BasicCegarLoop]: trace histogram [13, 13, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:25,275 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:25,276 INFO L410 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:25,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:25,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1047188612, now seen corresponding path program 9 times [2019-10-14 21:47:25,277 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:25,277 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005688339] [2019-10-14 21:47:25,277 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:25,278 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:25,278 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:25,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:25,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:25,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:25,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:25,444 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 4 proven. 169 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2019-10-14 21:47:25,444 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005688339] [2019-10-14 21:47:25,445 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1507817680] [2019-10-14 21:47:25,445 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 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 21:47:25,509 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2019-10-14 21:47:25,509 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:25,510 INFO L256 TraceCheckSpWp]: Trace formula consists of 120 conjuncts, 30 conjunts are in the unsatisfiable core [2019-10-14 21:47:25,512 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:25,902 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-14 21:47:25,903 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:25,905 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:25,905 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:25,905 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-14 21:47:25,929 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:47:25,998 INFO L134 CoverageAnalysis]: Checked inductivity of 197 backedges. 3 proven. 24 refuted. 0 times theorem prover too weak. 170 trivial. 0 not checked. [2019-10-14 21:47:25,999 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:25,999 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16] total 31 [2019-10-14 21:47:25,999 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609110871] [2019-10-14 21:47:26,000 INFO L442 AbstractCegarLoop]: Interpolant automaton has 31 states [2019-10-14 21:47:26,000 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:26,000 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2019-10-14 21:47:26,000 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=771, Unknown=0, NotChecked=0, Total=930 [2019-10-14 21:47:26,001 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 31 states. [2019-10-14 21:47:37,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:37,133 INFO L93 Difference]: Finished difference Result 112 states and 117 transitions. [2019-10-14 21:47:37,133 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2019-10-14 21:47:37,134 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 63 [2019-10-14 21:47:37,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:37,135 INFO L225 Difference]: With dead ends: 112 [2019-10-14 21:47:37,135 INFO L226 Difference]: Without dead ends: 79 [2019-10-14 21:47:37,137 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 109 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 630 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=464, Invalid=2506, Unknown=0, NotChecked=0, Total=2970 [2019-10-14 21:47:37,138 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2019-10-14 21:47:37,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2019-10-14 21:47:37,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2019-10-14 21:47:37,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2019-10-14 21:47:37,144 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 63 [2019-10-14 21:47:37,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:37,145 INFO L462 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2019-10-14 21:47:37,145 INFO L463 AbstractCegarLoop]: Interpolant automaton has 31 states. [2019-10-14 21:47:37,145 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2019-10-14 21:47:37,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2019-10-14 21:47:37,146 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:37,146 INFO L380 BasicCegarLoop]: trace histogram [14, 14, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:37,350 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:37,350 INFO L410 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:37,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:37,351 INFO L82 PathProgramCache]: Analyzing trace with hash -224600743, now seen corresponding path program 10 times [2019-10-14 21:47:37,351 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:37,351 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1101775020] [2019-10-14 21:47:37,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:37,351 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:37,352 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:37,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:37,472 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 208 trivial. 0 not checked. [2019-10-14 21:47:37,472 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1101775020] [2019-10-14 21:47:37,473 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1581956682] [2019-10-14 21:47:37,473 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 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 21:47:37,527 INFO L249 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2019-10-14 21:47:37,527 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:37,529 INFO L256 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 16 conjunts are in the unsatisfiable core [2019-10-14 21:47:37,530 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:37,742 INFO L134 CoverageAnalysis]: Checked inductivity of 244 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2019-10-14 21:47:37,742 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:37,742 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 26 [2019-10-14 21:47:37,742 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [149168227] [2019-10-14 21:47:37,743 INFO L442 AbstractCegarLoop]: Interpolant automaton has 26 states [2019-10-14 21:47:37,743 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:37,744 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2019-10-14 21:47:37,744 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=164, Invalid=486, Unknown=0, NotChecked=0, Total=650 [2019-10-14 21:47:37,744 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 26 states. [2019-10-14 21:47:38,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:38,212 INFO L93 Difference]: Finished difference Result 136 states and 144 transitions. [2019-10-14 21:47:38,212 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2019-10-14 21:47:38,213 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 73 [2019-10-14 21:47:38,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:38,213 INFO L225 Difference]: With dead ends: 136 [2019-10-14 21:47:38,214 INFO L226 Difference]: Without dead ends: 81 [2019-10-14 21:47:38,215 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 66 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 292 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=497, Invalid=1395, Unknown=0, NotChecked=0, Total=1892 [2019-10-14 21:47:38,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2019-10-14 21:47:38,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2019-10-14 21:47:38,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2019-10-14 21:47:38,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2019-10-14 21:47:38,230 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 73 [2019-10-14 21:47:38,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:38,232 INFO L462 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2019-10-14 21:47:38,232 INFO L463 AbstractCegarLoop]: Interpolant automaton has 26 states. [2019-10-14 21:47:38,232 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2019-10-14 21:47:38,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2019-10-14 21:47:38,233 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:38,234 INFO L380 BasicCegarLoop]: trace histogram [15, 15, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:38,437 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:38,437 INFO L410 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:38,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:38,437 INFO L82 PathProgramCache]: Analyzing trace with hash -305865668, now seen corresponding path program 11 times [2019-10-14 21:47:38,438 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:38,438 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1847631180] [2019-10-14 21:47:38,438 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,438 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:38,438 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:38,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:38,666 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 6 proven. 225 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 21:47:38,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1847631180] [2019-10-14 21:47:38,666 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [726688100] [2019-10-14 21:47:38,666 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 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 21:47:38,853 INFO L249 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 16 check-sat command(s) [2019-10-14 21:47:38,854 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:38,856 INFO L256 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 17 conjunts are in the unsatisfiable core [2019-10-14 21:47:38,857 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:38,886 INFO L134 CoverageAnalysis]: Checked inductivity of 281 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2019-10-14 21:47:38,887 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:38,887 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 18] total 20 [2019-10-14 21:47:38,887 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1456814304] [2019-10-14 21:47:38,888 INFO L442 AbstractCegarLoop]: Interpolant automaton has 20 states [2019-10-14 21:47:38,888 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:38,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2019-10-14 21:47:38,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2019-10-14 21:47:38,888 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 20 states. [2019-10-14 21:47:39,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:39,037 INFO L93 Difference]: Finished difference Result 126 states and 130 transitions. [2019-10-14 21:47:39,038 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2019-10-14 21:47:39,038 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 77 [2019-10-14 21:47:39,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:39,039 INFO L225 Difference]: With dead ends: 126 [2019-10-14 21:47:39,039 INFO L226 Difference]: Without dead ends: 83 [2019-10-14 21:47:39,040 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 84 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 21:47:39,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2019-10-14 21:47:39,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 82. [2019-10-14 21:47:39,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2019-10-14 21:47:39,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2019-10-14 21:47:39,046 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 77 [2019-10-14 21:47:39,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:39,047 INFO L462 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2019-10-14 21:47:39,047 INFO L463 AbstractCegarLoop]: Interpolant automaton has 20 states. [2019-10-14 21:47:39,047 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2019-10-14 21:47:39,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2019-10-14 21:47:39,048 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:39,048 INFO L380 BasicCegarLoop]: trace histogram [16, 16, 5, 4, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:39,250 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:39,251 INFO L410 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:39,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:39,251 INFO L82 PathProgramCache]: Analyzing trace with hash 1973955162, now seen corresponding path program 12 times [2019-10-14 21:47:39,252 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:39,252 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1616851649] [2019-10-14 21:47:39,252 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,253 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:39,253 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:39,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,455 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:39,462 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 6 proven. 256 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2019-10-14 21:47:39,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1616851649] [2019-10-14 21:47:39,462 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1012360749] [2019-10-14 21:47:39,462 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 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:39,549 INFO L249 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 9 check-sat command(s) [2019-10-14 21:47:39,549 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:39,550 INFO L256 TraceCheckSpWp]: Trace formula consists of 170 conjuncts, 23 conjunts are in the unsatisfiable core [2019-10-14 21:47:39,552 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:40,079 INFO L172 IndexEqualityManager]: detected equality via solver [2019-10-14 21:47:40,082 INFO L341 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:40,082 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 10 [2019-10-14 21:47:40,083 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:40,088 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:40,089 INFO L496 ElimStorePlain]: Start of recursive call 1: 3 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:40,089 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 4 variables, input treesize:28, output treesize:3 [2019-10-14 21:47:40,106 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:47:40,163 INFO L134 CoverageAnalysis]: Checked inductivity of 312 backedges. 15 proven. 29 refuted. 0 times theorem prover too weak. 268 trivial. 0 not checked. [2019-10-14 21:47:40,163 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:40,163 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 16] total 34 [2019-10-14 21:47:40,164 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [345333840] [2019-10-14 21:47:40,164 INFO L442 AbstractCegarLoop]: Interpolant automaton has 34 states [2019-10-14 21:47:40,164 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:40,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2019-10-14 21:47:40,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=223, Invalid=899, Unknown=0, NotChecked=0, Total=1122 [2019-10-14 21:47:40,165 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 34 states. [2019-10-14 21:47:51,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:51,648 INFO L93 Difference]: Finished difference Result 151 states and 160 transitions. [2019-10-14 21:47:51,648 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2019-10-14 21:47:51,648 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 79 [2019-10-14 21:47:51,649 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:51,650 INFO L225 Difference]: With dead ends: 151 [2019-10-14 21:47:51,650 INFO L226 Difference]: Without dead ends: 87 [2019-10-14 21:47:51,652 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 69 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 899 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=699, Invalid=3083, Unknown=0, NotChecked=0, Total=3782 [2019-10-14 21:47:51,652 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2019-10-14 21:47:51,657 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 86. [2019-10-14 21:47:51,657 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2019-10-14 21:47:51,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2019-10-14 21:47:51,658 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 79 [2019-10-14 21:47:51,658 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:51,658 INFO L462 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2019-10-14 21:47:51,658 INFO L463 AbstractCegarLoop]: Interpolant automaton has 34 states. [2019-10-14 21:47:51,658 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2019-10-14 21:47:51,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2019-10-14 21:47:51,659 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:51,659 INFO L380 BasicCegarLoop]: trace histogram [17, 17, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:51,865 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:51,865 INFO L410 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:51,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:51,866 INFO L82 PathProgramCache]: Analyzing trace with hash -261636483, now seen corresponding path program 13 times [2019-10-14 21:47:51,866 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:51,866 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926210637] [2019-10-14 21:47:51,867 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,867 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:51,867 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:51,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,092 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 6 proven. 289 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:47:52,092 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926210637] [2019-10-14 21:47:52,092 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1779509725] [2019-10-14 21:47:52,092 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 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,179 INFO L256 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 19 conjunts are in the unsatisfiable core [2019-10-14 21:47:52,181 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:52,194 INFO L134 CoverageAnalysis]: Checked inductivity of 355 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:47:52,194 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:52,194 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 20] total 22 [2019-10-14 21:47:52,194 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2138177601] [2019-10-14 21:47:52,195 INFO L442 AbstractCegarLoop]: Interpolant automaton has 22 states [2019-10-14 21:47:52,195 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:52,195 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2019-10-14 21:47:52,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:47:52,195 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 22 states. [2019-10-14 21:47:52,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:52,358 INFO L93 Difference]: Finished difference Result 134 states and 138 transitions. [2019-10-14 21:47:52,359 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2019-10-14 21:47:52,359 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 83 [2019-10-14 21:47:52,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:52,360 INFO L225 Difference]: With dead ends: 134 [2019-10-14 21:47:52,360 INFO L226 Difference]: Without dead ends: 89 [2019-10-14 21:47:52,361 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2019-10-14 21:47:52,361 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2019-10-14 21:47:52,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 88. [2019-10-14 21:47:52,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2019-10-14 21:47:52,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2019-10-14 21:47:52,366 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 83 [2019-10-14 21:47:52,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:52,367 INFO L462 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2019-10-14 21:47:52,367 INFO L463 AbstractCegarLoop]: Interpolant automaton has 22 states. [2019-10-14 21:47:52,367 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2019-10-14 21:47:52,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2019-10-14 21:47:52,368 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:52,368 INFO L380 BasicCegarLoop]: trace histogram [18, 18, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:52,578 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,578 INFO L410 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:52,578 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:52,579 INFO L82 PathProgramCache]: Analyzing trace with hash 454262299, now seen corresponding path program 14 times [2019-10-14 21:47:52,579 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:52,579 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2011525222] [2019-10-14 21:47:52,580 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,580 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:52,580 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:52,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:52,799 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 6 proven. 324 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:47:52,799 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2011525222] [2019-10-14 21:47:52,799 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1416409195] [2019-10-14 21:47:52,799 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 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:52,867 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2019-10-14 21:47:52,867 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:52,868 INFO L256 TraceCheckSpWp]: Trace formula consists of 235 conjuncts, 20 conjunts are in the unsatisfiable core [2019-10-14 21:47:52,870 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:52,898 INFO L134 CoverageAnalysis]: Checked inductivity of 390 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2019-10-14 21:47:52,899 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:52,899 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 21] total 23 [2019-10-14 21:47:52,899 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836774844] [2019-10-14 21:47:52,899 INFO L442 AbstractCegarLoop]: Interpolant automaton has 23 states [2019-10-14 21:47:52,899 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:52,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2019-10-14 21:47:52,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:47:52,900 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 23 states. [2019-10-14 21:47:53,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2019-10-14 21:47:53,080 INFO L93 Difference]: Finished difference Result 136 states and 140 transitions. [2019-10-14 21:47:53,080 INFO L142 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2019-10-14 21:47:53,081 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 85 [2019-10-14 21:47:53,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2019-10-14 21:47:53,082 INFO L225 Difference]: With dead ends: 136 [2019-10-14 21:47:53,082 INFO L226 Difference]: Without dead ends: 91 [2019-10-14 21:47:53,083 INFO L600 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 92 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2019-10-14 21:47:53,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2019-10-14 21:47:53,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 90. [2019-10-14 21:47:53,089 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2019-10-14 21:47:53,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2019-10-14 21:47:53,089 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 85 [2019-10-14 21:47:53,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2019-10-14 21:47:53,090 INFO L462 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2019-10-14 21:47:53,090 INFO L463 AbstractCegarLoop]: Interpolant automaton has 23 states. [2019-10-14 21:47:53,090 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2019-10-14 21:47:53,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2019-10-14 21:47:53,091 INFO L372 BasicCegarLoop]: Found error trace [2019-10-14 21:47:53,091 INFO L380 BasicCegarLoop]: trace histogram [19, 19, 6, 5, 4, 4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2019-10-14 21:47:53,294 WARN L499 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:53,295 INFO L410 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2019-10-14 21:47:53,295 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2019-10-14 21:47:53,295 INFO L82 PathProgramCache]: Analyzing trace with hash 1238224441, now seen corresponding path program 15 times [2019-10-14 21:47:53,296 INFO L157 tionRefinementEngine]: Executing refinement strategy CAMEL [2019-10-14 21:47:53,296 INFO L342 tionRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399475242] [2019-10-14 21:47:53,297 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,297 INFO L116 rtionOrderModulation]: Craig_NestedInterpolation forces the order to NOT_INCREMENTALLY [2019-10-14 21:47:53,297 INFO L94 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2019-10-14 21:47:53,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2019-10-14 21:47:53,542 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 6 proven. 361 refuted. 0 times theorem prover too weak. 60 trivial. 0 not checked. [2019-10-14 21:47:53,542 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399475242] [2019-10-14 21:47:53,543 INFO L342 tionRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1033719576] [2019-10-14 21:47:53,543 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 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2019-10-14 21:47:53,613 INFO L249 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2019-10-14 21:47:53,614 INFO L250 tOrderPrioritization]: Conjunction of SSA is unsat [2019-10-14 21:47:53,615 INFO L256 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 34 conjunts are in the unsatisfiable core [2019-10-14 21:47:53,616 INFO L279 TraceCheckSpWp]: Computing forward predicates... [2019-10-14 21:47:54,099 INFO L375 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2019-10-14 21:47:54,100 INFO L496 ElimStorePlain]: Start of recursive call 2: End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,101 INFO L567 ElimStorePlain]: treesize reduction 0, result has 100.0 percent of original size [2019-10-14 21:47:54,101 INFO L496 ElimStorePlain]: Start of recursive call 1: 1 dim-0 vars, 1 dim-2 vars, End of recursive call: and 1 xjuncts. [2019-10-14 21:47:54,101 INFO L221 ElimStorePlain]: Needed 2 recursive calls to eliminate 2 variables, input treesize:15, output treesize:3 [2019-10-14 21:47:54,121 INFO L319 QuantifierPusher]: Applying distributivity, recursing on 2 terms [2019-10-14 21:47:54,176 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 6 proven. 52 refuted. 0 times theorem prover too weak. 369 trivial. 0 not checked. [2019-10-14 21:47:54,176 INFO L223 tionRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2019-10-14 21:47:54,177 INFO L236 tionRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 18] total 39 [2019-10-14 21:47:54,177 INFO L342 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1092110297] [2019-10-14 21:47:54,177 INFO L442 AbstractCegarLoop]: Interpolant automaton has 39 states [2019-10-14 21:47:54,177 INFO L137 tionRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2019-10-14 21:47:54,178 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2019-10-14 21:47:54,178 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=276, Invalid=1206, Unknown=0, NotChecked=0, Total=1482 [2019-10-14 21:47:54,178 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 39 states.