/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy CAMEL_NO_AM -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-79ed534 [2020-07-19 21:28:23,219 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-19 21:28:23,221 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-19 21:28:23,235 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-19 21:28:23,235 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-19 21:28:23,236 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-19 21:28:23,238 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-19 21:28:23,240 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-19 21:28:23,241 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-19 21:28:23,242 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-19 21:28:23,243 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-19 21:28:23,244 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-19 21:28:23,245 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-19 21:28:23,246 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-19 21:28:23,247 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-19 21:28:23,248 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-19 21:28:23,249 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-19 21:28:23,250 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-19 21:28:23,252 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-19 21:28:23,254 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-19 21:28:23,256 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-19 21:28:23,257 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-19 21:28:23,258 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-19 21:28:23,259 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-19 21:28:23,262 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-19 21:28:23,283 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-19 21:28:23,284 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-19 21:28:23,285 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-19 21:28:23,288 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 [2020-07-19 21:28:23,316 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-19 21:28:23,317 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-19 21:28:23,318 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-19 21:28:23,319 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-19 21:28:23,319 INFO L138 SettingsManager]: * Use SBE=true [2020-07-19 21:28:23,319 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-19 21:28:23,319 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-19 21:28:23,319 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-19 21:28:23,320 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-19 21:28:23,320 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-19 21:28:23,321 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-19 21:28:23,321 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-19 21:28:23,321 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-19 21:28:23,322 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-19 21:28:23,322 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-19 21:28:23,322 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-19 21:28:23,322 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-19 21:28:23,323 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-19 21:28:23,323 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-19 21:28:23,323 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-19 21:28:23,323 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-19 21:28:23,323 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-19 21:28:23,324 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-19 21:28:23,324 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-19 21:28:23,324 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-19 21:28:23,324 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-19 21:28:23,324 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-19 21:28:23,325 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-19 21:28:23,325 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-19 21:28:23,325 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> CAMEL_NO_AM [2020-07-19 21:28:23,648 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-19 21:28:23,664 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-19 21:28:23,669 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-19 21:28:23,671 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-19 21:28:23,672 INFO L275 PluginConnector]: CDTParser initialized [2020-07-19 21:28:23,673 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c [2020-07-19 21:28:23,753 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b41dbcbe5/457ab81178a0424a8ee47f98d976916f/FLAG007f75434 [2020-07-19 21:28:24,297 INFO L306 CDTParser]: Found 1 translation units. [2020-07-19 21:28:24,298 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_i20_o20-2.c [2020-07-19 21:28:24,305 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b41dbcbe5/457ab81178a0424a8ee47f98d976916f/FLAG007f75434 [2020-07-19 21:28:24,645 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/b41dbcbe5/457ab81178a0424a8ee47f98d976916f [2020-07-19 21:28:24,654 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-19 21:28:24,657 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-19 21:28:24,658 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-19 21:28:24,658 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-19 21:28:24,662 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-19 21:28:24,663 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,666 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3dda2912 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24, skipping insertion in model container [2020-07-19 21:28:24,667 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,675 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-19 21:28:24,693 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-19 21:28:24,867 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-19 21:28:24,871 INFO L203 MainTranslator]: Completed pre-run [2020-07-19 21:28:24,889 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-19 21:28:24,907 INFO L208 MainTranslator]: Completed translation [2020-07-19 21:28:24,909 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24 WrapperNode [2020-07-19 21:28:24,909 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-19 21:28:24,910 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-19 21:28:24,910 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-19 21:28:24,911 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-19 21:28:24,926 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,929 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,936 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,936 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,940 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,943 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,944 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (1/1) ... [2020-07-19 21:28:24,945 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-19 21:28:24,947 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-19 21:28:24,947 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-19 21:28:24,947 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-19 21:28:24,948 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (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 [2020-07-19 21:28:25,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-19 21:28:25,122 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-19 21:28:25,122 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-07-19 21:28:25,122 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-19 21:28:25,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-19 21:28:25,122 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-19 21:28:25,123 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-07-19 21:28:25,123 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-19 21:28:25,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-19 21:28:25,123 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-19 21:28:25,295 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-19 21:28:25,296 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-19 21:28:25,300 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 09:28:25 BoogieIcfgContainer [2020-07-19 21:28:25,300 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-19 21:28:25,301 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-19 21:28:25,301 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-19 21:28:25,304 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-19 21:28:25,305 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.07 09:28:24" (1/3) ... [2020-07-19 21:28:25,305 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41fc5a7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 09:28:25, skipping insertion in model container [2020-07-19 21:28:25,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.07 09:28:24" (2/3) ... [2020-07-19 21:28:25,306 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41fc5a7a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.07 09:28:25, skipping insertion in model container [2020-07-19 21:28:25,306 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.07 09:28:25" (3/3) ... [2020-07-19 21:28:25,308 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i20_o20-2.c [2020-07-19 21:28:25,322 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-07-19 21:28:25,332 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-19 21:28:25,349 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-19 21:28:25,379 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-19 21:28:25,380 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-19 21:28:25,380 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-07-19 21:28:25,381 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-19 21:28:25,381 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-19 21:28:25,381 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-19 21:28:25,381 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-19 21:28:25,381 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-19 21:28:25,399 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-07-19 21:28:25,405 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-19 21:28:25,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:25,406 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:25,407 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:25,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:25,412 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-07-19 21:28:25,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:25,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [807387252] [2020-07-19 21:28:25,421 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:25,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,634 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-19 21:28:25,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [807387252] [2020-07-19 21:28:25,636 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-19 21:28:25,637 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-19 21:28:25,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003055779] [2020-07-19 21:28:25,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-19 21:28:25,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:25,674 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-19 21:28:25,675 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-19 21:28:25,679 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-07-19 21:28:25,764 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:25,764 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-07-19 21:28:25,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-19 21:28:25,767 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-19 21:28:25,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:25,780 INFO L225 Difference]: With dead ends: 30 [2020-07-19 21:28:25,780 INFO L226 Difference]: Without dead ends: 18 [2020-07-19 21:28:25,785 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-19 21:28:25,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-07-19 21:28:25,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-07-19 21:28:25,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-07-19 21:28:25,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-07-19 21:28:25,832 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-07-19 21:28:25,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:25,833 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-07-19 21:28:25,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-19 21:28:25,833 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-07-19 21:28:25,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-07-19 21:28:25,836 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:25,836 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:25,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-07-19 21:28:25,837 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:25,837 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:25,838 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-07-19 21:28:25,838 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:25,839 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1788685078] [2020-07-19 21:28:25,839 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:25,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:25,985 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-19 21:28:25,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1788685078] [2020-07-19 21:28:25,986 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1073056182] [2020-07-19 21:28:25,986 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:26,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-19 21:28:26,051 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:26,150 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-07-19 21:28:26,151 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:26,151 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-07-19 21:28:26,153 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086278434] [2020-07-19 21:28:26,154 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-19 21:28:26,154 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:26,155 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-19 21:28:26,155 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-19 21:28:26,155 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-07-19 21:28:26,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:26,236 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-07-19 21:28:26,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-19 21:28:26,237 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-07-19 21:28:26,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:26,238 INFO L225 Difference]: With dead ends: 25 [2020-07-19 21:28:26,238 INFO L226 Difference]: Without dead ends: 21 [2020-07-19 21:28:26,240 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-07-19 21:28:26,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-19 21:28:26,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-19 21:28:26,247 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-19 21:28:26,248 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-07-19 21:28:26,248 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-07-19 21:28:26,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:26,249 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-07-19 21:28:26,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-19 21:28:26,249 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-07-19 21:28:26,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-07-19 21:28:26,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:26,251 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:26,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-07-19 21:28:26,466 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:26,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:26,467 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-07-19 21:28:26,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:26,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1258393711] [2020-07-19 21:28:26,468 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:26,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,658 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-19 21:28:26,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1258393711] [2020-07-19 21:28:26,659 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1014047338] [2020-07-19 21:28:26,659 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:26,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:26,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-19 21:28:26,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:26,735 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-07-19 21:28:26,736 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:26,736 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-07-19 21:28:26,736 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1471170409] [2020-07-19 21:28:26,737 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-19 21:28:26,738 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:26,738 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-19 21:28:26,739 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-19 21:28:26,739 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-07-19 21:28:26,812 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:26,813 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-07-19 21:28:26,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-19 21:28:26,814 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-07-19 21:28:26,814 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:26,815 INFO L225 Difference]: With dead ends: 28 [2020-07-19 21:28:26,815 INFO L226 Difference]: Without dead ends: 24 [2020-07-19 21:28:26,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2020-07-19 21:28:26,817 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-07-19 21:28:26,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-07-19 21:28:26,823 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-07-19 21:28:26,824 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-07-19 21:28:26,824 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-07-19 21:28:26,825 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:26,825 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-07-19 21:28:26,825 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-19 21:28:26,826 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-07-19 21:28:26,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-07-19 21:28:26,827 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:26,827 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:27,041 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:27,042 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:27,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:27,043 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-07-19 21:28:27,043 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:27,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084440159] [2020-07-19 21:28:27,044 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:27,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,219 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-19 21:28:27,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084440159] [2020-07-19 21:28:27,220 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740949234] [2020-07-19 21:28:27,220 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:27,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-19 21:28:27,258 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:27,298 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-07-19 21:28:27,299 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:27,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 10 [2020-07-19 21:28:27,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [141703946] [2020-07-19 21:28:27,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-19 21:28:27,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:27,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-19 21:28:27,301 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-07-19 21:28:27,302 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 10 states. [2020-07-19 21:28:27,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:27,392 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-07-19 21:28:27,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-19 21:28:27,393 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 31 [2020-07-19 21:28:27,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:27,394 INFO L225 Difference]: With dead ends: 31 [2020-07-19 21:28:27,394 INFO L226 Difference]: Without dead ends: 27 [2020-07-19 21:28:27,395 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-07-19 21:28:27,396 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-19 21:28:27,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-07-19 21:28:27,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-07-19 21:28:27,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-07-19 21:28:27,402 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-07-19 21:28:27,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:27,403 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-07-19 21:28:27,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-19 21:28:27,403 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-07-19 21:28:27,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-07-19 21:28:27,405 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:27,405 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:27,611 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:27,613 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:27,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:27,613 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-07-19 21:28:27,614 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:27,615 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [849168375] [2020-07-19 21:28:27,615 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:27,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,678 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,816 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-19 21:28:27,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [849168375] [2020-07-19 21:28:27,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1460186557] [2020-07-19 21:28:27,817 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:27,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:27,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-19 21:28:27,853 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:27,895 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-07-19 21:28:27,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:27,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2020-07-19 21:28:27,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [465776381] [2020-07-19 21:28:27,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-19 21:28:27,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:27,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-19 21:28:27,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-07-19 21:28:27,898 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 11 states. [2020-07-19 21:28:28,005 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:28,005 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-07-19 21:28:28,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-19 21:28:28,006 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-07-19 21:28:28,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:28,008 INFO L225 Difference]: With dead ends: 34 [2020-07-19 21:28:28,008 INFO L226 Difference]: Without dead ends: 30 [2020-07-19 21:28:28,009 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2020-07-19 21:28:28,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-19 21:28:28,014 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-19 21:28:28,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-19 21:28:28,016 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-07-19 21:28:28,016 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-07-19 21:28:28,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:28,017 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-07-19 21:28:28,017 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-19 21:28:28,017 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-07-19 21:28:28,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-07-19 21:28:28,018 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:28,018 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:28,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:28,233 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:28,234 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:28,234 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-07-19 21:28:28,235 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:28,235 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574281427] [2020-07-19 21:28:28,235 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:28,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,274 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,403 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,445 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-19 21:28:28,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574281427] [2020-07-19 21:28:28,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513040264] [2020-07-19 21:28:28,446 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:28,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,482 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-19 21:28:28,485 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:28,532 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 40 trivial. 0 not checked. [2020-07-19 21:28:28,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:28,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 12 [2020-07-19 21:28:28,533 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [340719206] [2020-07-19 21:28:28,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-19 21:28:28,535 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:28,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-19 21:28:28,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=89, Unknown=0, NotChecked=0, Total=132 [2020-07-19 21:28:28,536 INFO L87 Difference]: Start difference. First operand 30 states and 31 transitions. Second operand 12 states. [2020-07-19 21:28:28,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:28,684 INFO L93 Difference]: Finished difference Result 37 states and 38 transitions. [2020-07-19 21:28:28,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-19 21:28:28,685 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 43 [2020-07-19 21:28:28,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:28,687 INFO L225 Difference]: With dead ends: 37 [2020-07-19 21:28:28,687 INFO L226 Difference]: Without dead ends: 33 [2020-07-19 21:28:28,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 55 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-07-19 21:28:28,688 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-19 21:28:28,701 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-19 21:28:28,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-19 21:28:28,705 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 34 transitions. [2020-07-19 21:28:28,705 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 34 transitions. Word has length 43 [2020-07-19 21:28:28,706 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:28,706 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 34 transitions. [2020-07-19 21:28:28,707 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-19 21:28:28,707 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 34 transitions. [2020-07-19 21:28:28,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-07-19 21:28:28,712 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:28,712 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:28,913 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-07-19 21:28:28,913 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:28,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:28,914 INFO L82 PathProgramCache]: Analyzing trace with hash -1590630787, now seen corresponding path program 6 times [2020-07-19 21:28:28,914 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:28,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070958363] [2020-07-19 21:28:28,915 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:28,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:28,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,182 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-19 21:28:29,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070958363] [2020-07-19 21:28:29,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041928565] [2020-07-19 21:28:29,184 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:29,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-19 21:28:29,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:29,281 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2020-07-19 21:28:29,281 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:29,282 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 13 [2020-07-19 21:28:29,282 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786874486] [2020-07-19 21:28:29,283 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-19 21:28:29,283 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:29,284 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-19 21:28:29,284 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2020-07-19 21:28:29,284 INFO L87 Difference]: Start difference. First operand 33 states and 34 transitions. Second operand 13 states. [2020-07-19 21:28:29,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:29,402 INFO L93 Difference]: Finished difference Result 40 states and 41 transitions. [2020-07-19 21:28:29,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-19 21:28:29,403 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 49 [2020-07-19 21:28:29,403 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:29,404 INFO L225 Difference]: With dead ends: 40 [2020-07-19 21:28:29,404 INFO L226 Difference]: Without dead ends: 36 [2020-07-19 21:28:29,405 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 63 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=130, Invalid=250, Unknown=0, NotChecked=0, Total=380 [2020-07-19 21:28:29,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-07-19 21:28:29,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-07-19 21:28:29,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-19 21:28:29,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2020-07-19 21:28:29,412 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 49 [2020-07-19 21:28:29,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:29,413 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2020-07-19 21:28:29,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-19 21:28:29,413 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2020-07-19 21:28:29,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-07-19 21:28:29,414 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:29,414 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:29,628 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:29,629 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:29,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:29,630 INFO L82 PathProgramCache]: Analyzing trace with hash 1532150511, now seen corresponding path program 7 times [2020-07-19 21:28:29,630 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:29,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1426284810] [2020-07-19 21:28:29,631 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:29,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,666 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,718 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,783 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,847 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-19 21:28:29,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1426284810] [2020-07-19 21:28:29,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379643434] [2020-07-19 21:28:29,848 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:29,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:29,902 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-19 21:28:29,906 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:29,969 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 77 trivial. 0 not checked. [2020-07-19 21:28:29,970 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:29,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 14 [2020-07-19 21:28:29,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [227458230] [2020-07-19 21:28:29,971 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-19 21:28:29,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:29,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-19 21:28:29,972 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=120, Unknown=0, NotChecked=0, Total=182 [2020-07-19 21:28:29,972 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand 14 states. [2020-07-19 21:28:30,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:30,097 INFO L93 Difference]: Finished difference Result 43 states and 44 transitions. [2020-07-19 21:28:30,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-19 21:28:30,098 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 55 [2020-07-19 21:28:30,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:30,099 INFO L225 Difference]: With dead ends: 43 [2020-07-19 21:28:30,099 INFO L226 Difference]: Without dead ends: 39 [2020-07-19 21:28:30,100 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 63 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=159, Invalid=303, Unknown=0, NotChecked=0, Total=462 [2020-07-19 21:28:30,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-07-19 21:28:30,106 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-07-19 21:28:30,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-07-19 21:28:30,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-07-19 21:28:30,107 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 55 [2020-07-19 21:28:30,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:30,108 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-07-19 21:28:30,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-19 21:28:30,108 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-07-19 21:28:30,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-07-19 21:28:30,109 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:30,110 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:30,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:30,323 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:30,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:30,324 INFO L82 PathProgramCache]: Analyzing trace with hash 1140618237, now seen corresponding path program 8 times [2020-07-19 21:28:30,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:30,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1991635495] [2020-07-19 21:28:30,325 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:30,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,596 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-19 21:28:30,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1991635495] [2020-07-19 21:28:30,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1043828142] [2020-07-19 21:28:30,597 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:30,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:30,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-19 21:28:30,645 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:30,705 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2020-07-19 21:28:30,706 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:30,706 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 15 [2020-07-19 21:28:30,706 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [424595783] [2020-07-19 21:28:30,707 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-19 21:28:30,707 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:30,708 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-19 21:28:30,708 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=137, Unknown=0, NotChecked=0, Total=210 [2020-07-19 21:28:30,708 INFO L87 Difference]: Start difference. First operand 39 states and 40 transitions. Second operand 15 states. [2020-07-19 21:28:30,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:30,857 INFO L93 Difference]: Finished difference Result 46 states and 47 transitions. [2020-07-19 21:28:30,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-19 21:28:30,858 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 61 [2020-07-19 21:28:30,859 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:30,860 INFO L225 Difference]: With dead ends: 46 [2020-07-19 21:28:30,863 INFO L226 Difference]: Without dead ends: 42 [2020-07-19 21:28:30,865 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 101 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 80 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=191, Invalid=361, Unknown=0, NotChecked=0, Total=552 [2020-07-19 21:28:30,866 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-19 21:28:30,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-07-19 21:28:30,877 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-19 21:28:30,878 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 43 transitions. [2020-07-19 21:28:30,878 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 43 transitions. Word has length 61 [2020-07-19 21:28:30,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:30,879 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 43 transitions. [2020-07-19 21:28:30,879 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-19 21:28:30,879 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 43 transitions. [2020-07-19 21:28:30,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-07-19 21:28:30,883 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:30,883 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:31,084 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2020-07-19 21:28:31,085 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:31,085 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:31,085 INFO L82 PathProgramCache]: Analyzing trace with hash -1749177617, now seen corresponding path program 9 times [2020-07-19 21:28:31,085 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:31,086 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1462892177] [2020-07-19 21:28:31,086 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:31,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,426 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-19 21:28:31,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1462892177] [2020-07-19 21:28:31,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624561157] [2020-07-19 21:28:31,427 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:31,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,475 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-19 21:28:31,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 126 trivial. 0 not checked. [2020-07-19 21:28:31,564 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:31,564 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 16 [2020-07-19 21:28:31,564 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [798942193] [2020-07-19 21:28:31,567 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-19 21:28:31,568 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:31,568 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-19 21:28:31,568 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=155, Unknown=0, NotChecked=0, Total=240 [2020-07-19 21:28:31,569 INFO L87 Difference]: Start difference. First operand 42 states and 43 transitions. Second operand 16 states. [2020-07-19 21:28:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:31,722 INFO L93 Difference]: Finished difference Result 49 states and 50 transitions. [2020-07-19 21:28:31,723 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-19 21:28:31,723 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 67 [2020-07-19 21:28:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:31,726 INFO L225 Difference]: With dead ends: 49 [2020-07-19 21:28:31,727 INFO L226 Difference]: Without dead ends: 45 [2020-07-19 21:28:31,728 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 87 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=226, Invalid=424, Unknown=0, NotChecked=0, Total=650 [2020-07-19 21:28:31,728 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-07-19 21:28:31,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-07-19 21:28:31,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-19 21:28:31,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 46 transitions. [2020-07-19 21:28:31,733 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 46 transitions. Word has length 67 [2020-07-19 21:28:31,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:31,734 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 46 transitions. [2020-07-19 21:28:31,734 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-19 21:28:31,734 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 46 transitions. [2020-07-19 21:28:31,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-07-19 21:28:31,735 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:31,735 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:31,948 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:31,949 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:31,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:31,950 INFO L82 PathProgramCache]: Analyzing trace with hash -1580609155, now seen corresponding path program 10 times [2020-07-19 21:28:31,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:31,951 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1673379833] [2020-07-19 21:28:31,951 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:31,998 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,328 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-19 21:28:32,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1673379833] [2020-07-19 21:28:32,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1947801528] [2020-07-19 21:28:32,329 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:32,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,376 INFO L263 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-19 21:28:32,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:32,434 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 155 trivial. 0 not checked. [2020-07-19 21:28:32,435 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:32,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 17 [2020-07-19 21:28:32,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907644598] [2020-07-19 21:28:32,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-19 21:28:32,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:32,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-19 21:28:32,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=174, Unknown=0, NotChecked=0, Total=272 [2020-07-19 21:28:32,437 INFO L87 Difference]: Start difference. First operand 45 states and 46 transitions. Second operand 17 states. [2020-07-19 21:28:32,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:32,631 INFO L93 Difference]: Finished difference Result 52 states and 53 transitions. [2020-07-19 21:28:32,632 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-19 21:28:32,632 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 73 [2020-07-19 21:28:32,633 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:32,634 INFO L225 Difference]: With dead ends: 52 [2020-07-19 21:28:32,634 INFO L226 Difference]: Without dead ends: 48 [2020-07-19 21:28:32,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 121 GetRequests, 95 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 120 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=264, Invalid=492, Unknown=0, NotChecked=0, Total=756 [2020-07-19 21:28:32,637 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-19 21:28:32,651 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-07-19 21:28:32,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-07-19 21:28:32,652 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 49 transitions. [2020-07-19 21:28:32,652 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 49 transitions. Word has length 73 [2020-07-19 21:28:32,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:32,653 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 49 transitions. [2020-07-19 21:28:32,653 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-19 21:28:32,653 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 49 transitions. [2020-07-19 21:28:32,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-19 21:28:32,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:32,654 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:32,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:32,868 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:32,869 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:32,869 INFO L82 PathProgramCache]: Analyzing trace with hash -223837457, now seen corresponding path program 11 times [2020-07-19 21:28:32,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:32,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2055862367] [2020-07-19 21:28:32,870 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:32,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:32,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,308 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-19 21:28:33,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2055862367] [2020-07-19 21:28:33,309 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1666965593] [2020-07-19 21:28:33,309 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:33,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-19 21:28:33,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:33,424 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 0 proven. 187 refuted. 0 times theorem prover too weak. 187 trivial. 0 not checked. [2020-07-19 21:28:33,425 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:33,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 18 [2020-07-19 21:28:33,426 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [894582534] [2020-07-19 21:28:33,427 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-19 21:28:33,427 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:33,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-19 21:28:33,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=194, Unknown=0, NotChecked=0, Total=306 [2020-07-19 21:28:33,429 INFO L87 Difference]: Start difference. First operand 48 states and 49 transitions. Second operand 18 states. [2020-07-19 21:28:33,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:33,638 INFO L93 Difference]: Finished difference Result 55 states and 56 transitions. [2020-07-19 21:28:33,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-19 21:28:33,639 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 79 [2020-07-19 21:28:33,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:33,640 INFO L225 Difference]: With dead ends: 55 [2020-07-19 21:28:33,640 INFO L226 Difference]: Without dead ends: 51 [2020-07-19 21:28:33,642 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 103 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 143 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=305, Invalid=565, Unknown=0, NotChecked=0, Total=870 [2020-07-19 21:28:33,642 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-07-19 21:28:33,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2020-07-19 21:28:33,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-19 21:28:33,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 52 transitions. [2020-07-19 21:28:33,649 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 52 transitions. Word has length 79 [2020-07-19 21:28:33,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:33,650 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 52 transitions. [2020-07-19 21:28:33,650 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-19 21:28:33,650 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 52 transitions. [2020-07-19 21:28:33,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-07-19 21:28:33,651 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:33,652 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:33,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2020-07-19 21:28:33,866 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:33,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:33,867 INFO L82 PathProgramCache]: Analyzing trace with hash 1653931773, now seen corresponding path program 12 times [2020-07-19 21:28:33,867 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:33,867 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039202980] [2020-07-19 21:28:33,868 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:33,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:33,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,330 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-19 21:28:34,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039202980] [2020-07-19 21:28:34,331 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2146856572] [2020-07-19 21:28:34,331 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:34,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,386 INFO L263 TraceCheckSpWp]: Trace formula consists of 200 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-19 21:28:34,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:34,457 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 0 proven. 222 refuted. 0 times theorem prover too weak. 222 trivial. 0 not checked. [2020-07-19 21:28:34,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:34,458 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17] total 19 [2020-07-19 21:28:34,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786435876] [2020-07-19 21:28:34,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-19 21:28:34,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:34,460 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-19 21:28:34,460 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=215, Unknown=0, NotChecked=0, Total=342 [2020-07-19 21:28:34,460 INFO L87 Difference]: Start difference. First operand 51 states and 52 transitions. Second operand 19 states. [2020-07-19 21:28:34,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:34,685 INFO L93 Difference]: Finished difference Result 58 states and 59 transitions. [2020-07-19 21:28:34,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-19 21:28:34,686 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 85 [2020-07-19 21:28:34,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:34,687 INFO L225 Difference]: With dead ends: 58 [2020-07-19 21:28:34,687 INFO L226 Difference]: Without dead ends: 54 [2020-07-19 21:28:34,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 141 GetRequests, 111 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=349, Invalid=643, Unknown=0, NotChecked=0, Total=992 [2020-07-19 21:28:34,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-07-19 21:28:34,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2020-07-19 21:28:34,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-07-19 21:28:34,702 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 55 transitions. [2020-07-19 21:28:34,702 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 55 transitions. Word has length 85 [2020-07-19 21:28:34,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:34,703 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 55 transitions. [2020-07-19 21:28:34,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-19 21:28:34,706 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 55 transitions. [2020-07-19 21:28:34,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-07-19 21:28:34,707 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:34,707 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:34,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2020-07-19 21:28:34,908 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:34,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:34,909 INFO L82 PathProgramCache]: Analyzing trace with hash -218674449, now seen corresponding path program 13 times [2020-07-19 21:28:34,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:34,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477825064] [2020-07-19 21:28:34,909 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:34,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:34,983 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,370 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-19 21:28:35,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477825064] [2020-07-19 21:28:35,371 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2072355202] [2020-07-19 21:28:35,371 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:35,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:35,423 INFO L263 TraceCheckSpWp]: Trace formula consists of 214 conjuncts, 30 conjunts are in the unsatisfiable core [2020-07-19 21:28:35,426 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:35,522 INFO L134 CoverageAnalysis]: Checked inductivity of 520 backedges. 0 proven. 260 refuted. 0 times theorem prover too weak. 260 trivial. 0 not checked. [2020-07-19 21:28:35,523 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:35,523 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 20 [2020-07-19 21:28:35,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089347813] [2020-07-19 21:28:35,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-19 21:28:35,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:35,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-19 21:28:35,527 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=237, Unknown=0, NotChecked=0, Total=380 [2020-07-19 21:28:35,527 INFO L87 Difference]: Start difference. First operand 54 states and 55 transitions. Second operand 20 states. [2020-07-19 21:28:35,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:35,828 INFO L93 Difference]: Finished difference Result 61 states and 62 transitions. [2020-07-19 21:28:35,829 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-07-19 21:28:35,830 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 91 [2020-07-19 21:28:35,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:35,832 INFO L225 Difference]: With dead ends: 61 [2020-07-19 21:28:35,832 INFO L226 Difference]: Without dead ends: 57 [2020-07-19 21:28:35,834 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 151 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 195 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=396, Invalid=726, Unknown=0, NotChecked=0, Total=1122 [2020-07-19 21:28:35,834 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-19 21:28:35,847 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-19 21:28:35,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-19 21:28:35,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 58 transitions. [2020-07-19 21:28:35,852 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 58 transitions. Word has length 91 [2020-07-19 21:28:35,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:35,853 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 58 transitions. [2020-07-19 21:28:35,853 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-19 21:28:35,853 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 58 transitions. [2020-07-19 21:28:35,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2020-07-19 21:28:35,856 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:35,856 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 14, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:36,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2020-07-19 21:28:36,071 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:36,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:36,072 INFO L82 PathProgramCache]: Analyzing trace with hash 492436605, now seen corresponding path program 14 times [2020-07-19 21:28:36,072 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:36,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1114065920] [2020-07-19 21:28:36,073 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:36,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,678 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-19 21:28:36,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1114065920] [2020-07-19 21:28:36,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545301042] [2020-07-19 21:28:36,680 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:36,726 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:36,728 INFO L263 TraceCheckSpWp]: Trace formula consists of 228 conjuncts, 32 conjunts are in the unsatisfiable core [2020-07-19 21:28:36,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:36,794 INFO L134 CoverageAnalysis]: Checked inductivity of 602 backedges. 0 proven. 301 refuted. 0 times theorem prover too weak. 301 trivial. 0 not checked. [2020-07-19 21:28:36,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:36,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19] total 21 [2020-07-19 21:28:36,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [422165036] [2020-07-19 21:28:36,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-19 21:28:36,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:36,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-19 21:28:36,798 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=260, Unknown=0, NotChecked=0, Total=420 [2020-07-19 21:28:36,798 INFO L87 Difference]: Start difference. First operand 57 states and 58 transitions. Second operand 21 states. [2020-07-19 21:28:37,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:37,040 INFO L93 Difference]: Finished difference Result 64 states and 65 transitions. [2020-07-19 21:28:37,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-19 21:28:37,041 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 97 [2020-07-19 21:28:37,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:37,042 INFO L225 Difference]: With dead ends: 64 [2020-07-19 21:28:37,042 INFO L226 Difference]: Without dead ends: 60 [2020-07-19 21:28:37,046 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 127 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=446, Invalid=814, Unknown=0, NotChecked=0, Total=1260 [2020-07-19 21:28:37,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-07-19 21:28:37,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2020-07-19 21:28:37,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-19 21:28:37,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2020-07-19 21:28:37,055 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 97 [2020-07-19 21:28:37,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:37,056 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2020-07-19 21:28:37,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-19 21:28:37,056 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2020-07-19 21:28:37,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2020-07-19 21:28:37,057 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:37,057 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 15, 15, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:37,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,15 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:37,272 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:37,272 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:37,272 INFO L82 PathProgramCache]: Analyzing trace with hash 1083048687, now seen corresponding path program 15 times [2020-07-19 21:28:37,273 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:37,273 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733496547] [2020-07-19 21:28:37,273 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:37,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,414 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,902 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-19 21:28:37,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733496547] [2020-07-19 21:28:37,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578975498] [2020-07-19 21:28:37,903 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:37,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:37,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 34 conjunts are in the unsatisfiable core [2020-07-19 21:28:37,970 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:38,043 INFO L134 CoverageAnalysis]: Checked inductivity of 690 backedges. 0 proven. 345 refuted. 0 times theorem prover too weak. 345 trivial. 0 not checked. [2020-07-19 21:28:38,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:38,044 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 22 [2020-07-19 21:28:38,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1017216452] [2020-07-19 21:28:38,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-19 21:28:38,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:38,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-19 21:28:38,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=284, Unknown=0, NotChecked=0, Total=462 [2020-07-19 21:28:38,047 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand 22 states. [2020-07-19 21:28:38,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:38,331 INFO L93 Difference]: Finished difference Result 67 states and 68 transitions. [2020-07-19 21:28:38,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-07-19 21:28:38,332 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 103 [2020-07-19 21:28:38,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:38,333 INFO L225 Difference]: With dead ends: 67 [2020-07-19 21:28:38,333 INFO L226 Difference]: Without dead ends: 63 [2020-07-19 21:28:38,334 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 255 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=499, Invalid=907, Unknown=0, NotChecked=0, Total=1406 [2020-07-19 21:28:38,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-19 21:28:38,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2020-07-19 21:28:38,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-07-19 21:28:38,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 64 transitions. [2020-07-19 21:28:38,339 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 64 transitions. Word has length 103 [2020-07-19 21:28:38,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:38,340 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 64 transitions. [2020-07-19 21:28:38,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-19 21:28:38,340 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 64 transitions. [2020-07-19 21:28:38,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2020-07-19 21:28:38,341 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:38,342 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 16, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:38,557 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2020-07-19 21:28:38,557 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:38,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:38,558 INFO L82 PathProgramCache]: Analyzing trace with hash 404015613, now seen corresponding path program 16 times [2020-07-19 21:28:38,558 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:38,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1574999145] [2020-07-19 21:28:38,559 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:38,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:38,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,298 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-07-19 21:28:39,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1574999145] [2020-07-19 21:28:39,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [450689327] [2020-07-19 21:28:39,299 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:39,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 256 conjuncts, 36 conjunts are in the unsatisfiable core [2020-07-19 21:28:39,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:39,418 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 392 refuted. 0 times theorem prover too weak. 392 trivial. 0 not checked. [2020-07-19 21:28:39,418 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:39,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21] total 23 [2020-07-19 21:28:39,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [897586867] [2020-07-19 21:28:39,420 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-19 21:28:39,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:39,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-19 21:28:39,421 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=197, Invalid=309, Unknown=0, NotChecked=0, Total=506 [2020-07-19 21:28:39,421 INFO L87 Difference]: Start difference. First operand 63 states and 64 transitions. Second operand 23 states. [2020-07-19 21:28:39,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:39,665 INFO L93 Difference]: Finished difference Result 70 states and 71 transitions. [2020-07-19 21:28:39,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-19 21:28:39,666 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 109 [2020-07-19 21:28:39,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:39,668 INFO L225 Difference]: With dead ends: 70 [2020-07-19 21:28:39,668 INFO L226 Difference]: Without dead ends: 66 [2020-07-19 21:28:39,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 143 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=555, Invalid=1005, Unknown=0, NotChecked=0, Total=1560 [2020-07-19 21:28:39,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-07-19 21:28:39,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2020-07-19 21:28:39,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-19 21:28:39,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 67 transitions. [2020-07-19 21:28:39,679 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 67 transitions. Word has length 109 [2020-07-19 21:28:39,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:39,680 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 67 transitions. [2020-07-19 21:28:39,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-19 21:28:39,680 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 67 transitions. [2020-07-19 21:28:39,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 116 [2020-07-19 21:28:39,682 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:39,682 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 17, 17, 17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:39,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2020-07-19 21:28:39,899 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:39,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:39,900 INFO L82 PathProgramCache]: Analyzing trace with hash -464475409, now seen corresponding path program 17 times [2020-07-19 21:28:39,900 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:39,901 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790882661] [2020-07-19 21:28:39,901 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:39,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:39,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,761 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-07-19 21:28:40,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790882661] [2020-07-19 21:28:40,762 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342265522] [2020-07-19 21:28:40,762 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:40,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:40,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 38 conjunts are in the unsatisfiable core [2020-07-19 21:28:40,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:40,892 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 0 proven. 442 refuted. 0 times theorem prover too weak. 442 trivial. 0 not checked. [2020-07-19 21:28:40,893 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:40,893 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 24 [2020-07-19 21:28:40,893 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1024177138] [2020-07-19 21:28:40,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-19 21:28:40,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:40,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-19 21:28:40,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=335, Unknown=0, NotChecked=0, Total=552 [2020-07-19 21:28:40,896 INFO L87 Difference]: Start difference. First operand 66 states and 67 transitions. Second operand 24 states. [2020-07-19 21:28:41,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:41,197 INFO L93 Difference]: Finished difference Result 73 states and 74 transitions. [2020-07-19 21:28:41,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-07-19 21:28:41,197 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 115 [2020-07-19 21:28:41,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:41,199 INFO L225 Difference]: With dead ends: 73 [2020-07-19 21:28:41,199 INFO L226 Difference]: Without dead ends: 69 [2020-07-19 21:28:41,200 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 151 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=614, Invalid=1108, Unknown=0, NotChecked=0, Total=1722 [2020-07-19 21:28:41,200 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-07-19 21:28:41,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2020-07-19 21:28:41,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-07-19 21:28:41,205 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 70 transitions. [2020-07-19 21:28:41,205 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 70 transitions. Word has length 115 [2020-07-19 21:28:41,205 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:41,205 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 70 transitions. [2020-07-19 21:28:41,206 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-19 21:28:41,206 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 70 transitions. [2020-07-19 21:28:41,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-19 21:28:41,207 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:41,207 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:41,408 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2020-07-19 21:28:41,409 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:41,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:41,409 INFO L82 PathProgramCache]: Analyzing trace with hash 130115453, now seen corresponding path program 18 times [2020-07-19 21:28:41,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:41,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411614912] [2020-07-19 21:28:41,410 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:41,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,449 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,764 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:41,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,034 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,195 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-07-19 21:28:42,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411614912] [2020-07-19 21:28:42,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1483663663] [2020-07-19 21:28:42,197 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:42,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,256 INFO L263 TraceCheckSpWp]: Trace formula consists of 284 conjuncts, 40 conjunts are in the unsatisfiable core [2020-07-19 21:28:42,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:42,339 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 0 proven. 495 refuted. 0 times theorem prover too weak. 495 trivial. 0 not checked. [2020-07-19 21:28:42,339 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:42,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23] total 25 [2020-07-19 21:28:42,340 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [683492528] [2020-07-19 21:28:42,340 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-19 21:28:42,341 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:42,341 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-19 21:28:42,341 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=238, Invalid=362, Unknown=0, NotChecked=0, Total=600 [2020-07-19 21:28:42,342 INFO L87 Difference]: Start difference. First operand 69 states and 70 transitions. Second operand 25 states. [2020-07-19 21:28:42,658 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:42,660 INFO L93 Difference]: Finished difference Result 76 states and 77 transitions. [2020-07-19 21:28:42,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-07-19 21:28:42,661 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 121 [2020-07-19 21:28:42,662 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:42,663 INFO L225 Difference]: With dead ends: 76 [2020-07-19 21:28:42,663 INFO L226 Difference]: Without dead ends: 72 [2020-07-19 21:28:42,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 159 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 360 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=676, Invalid=1216, Unknown=0, NotChecked=0, Total=1892 [2020-07-19 21:28:42,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-19 21:28:42,671 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 72. [2020-07-19 21:28:42,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-07-19 21:28:42,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 73 transitions. [2020-07-19 21:28:42,674 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 73 transitions. Word has length 121 [2020-07-19 21:28:42,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:42,675 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 73 transitions. [2020-07-19 21:28:42,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-19 21:28:42,675 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 73 transitions. [2020-07-19 21:28:42,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2020-07-19 21:28:42,677 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:42,678 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 19, 19, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:42,890 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,19 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:42,891 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:42,891 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:42,891 INFO L82 PathProgramCache]: Analyzing trace with hash -2010955025, now seen corresponding path program 19 times [2020-07-19 21:28:42,892 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:42,892 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1594038814] [2020-07-19 21:28:42,892 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:42,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:42,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,172 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,238 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,700 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-07-19 21:28:43,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1594038814] [2020-07-19 21:28:43,700 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1516185079] [2020-07-19 21:28:43,700 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 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 [2020-07-19 21:28:43,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-07-19 21:28:43,757 INFO L263 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 42 conjunts are in the unsatisfiable core [2020-07-19 21:28:43,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-19 21:28:43,847 INFO L134 CoverageAnalysis]: Checked inductivity of 1102 backedges. 0 proven. 551 refuted. 0 times theorem prover too weak. 551 trivial. 0 not checked. [2020-07-19 21:28:43,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-19 21:28:43,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 26 [2020-07-19 21:28:43,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [744631468] [2020-07-19 21:28:43,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-19 21:28:43,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL_NO_AM [2020-07-19 21:28:43,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-19 21:28:43,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=390, Unknown=0, NotChecked=0, Total=650 [2020-07-19 21:28:43,849 INFO L87 Difference]: Start difference. First operand 72 states and 73 transitions. Second operand 26 states. [2020-07-19 21:28:44,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-19 21:28:44,232 INFO L93 Difference]: Finished difference Result 79 states and 80 transitions. [2020-07-19 21:28:44,232 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-07-19 21:28:44,232 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 127 [2020-07-19 21:28:44,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-19 21:28:44,234 INFO L225 Difference]: With dead ends: 79 [2020-07-19 21:28:44,234 INFO L226 Difference]: Without dead ends: 75 [2020-07-19 21:28:44,236 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 167 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=741, Invalid=1329, Unknown=0, NotChecked=0, Total=2070 [2020-07-19 21:28:44,238 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-07-19 21:28:44,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2020-07-19 21:28:44,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-19 21:28:44,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 76 transitions. [2020-07-19 21:28:44,247 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 76 transitions. Word has length 127 [2020-07-19 21:28:44,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-19 21:28:44,248 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 76 transitions. [2020-07-19 21:28:44,249 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-19 21:28:44,249 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 76 transitions. [2020-07-19 21:28:44,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 134 [2020-07-19 21:28:44,251 INFO L414 BasicCegarLoop]: Found error trace [2020-07-19 21:28:44,251 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-19 21:28:44,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,20 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-07-19 21:28:44,465 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-19 21:28:44,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-19 21:28:44,465 INFO L82 PathProgramCache]: Analyzing trace with hash -799288067, now seen corresponding path program 20 times [2020-07-19 21:28:44,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL_NO_AM [2020-07-19 21:28:44,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1643696699] [2020-07-19 21:28:44,466 INFO L95 rtionOrderModulation]: Keeping assertion order de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.tracecheck.ITraceCheckPreferences$AssertCodeBlockOrder@291b25f9 [2020-07-19 21:28:44,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-19 21:28:44,495 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-19 21:28:44,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-07-19 21:28:44,515 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-07-19 21:28:44,552 INFO L174 FreeRefinementEngine]: Strategy CAMEL_NO_AM found a feasible trace [2020-07-19 21:28:44,553 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-07-19 21:28:44,556 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-07-19 21:28:44,632 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.07 09:28:44 BoogieIcfgContainer [2020-07-19 21:28:44,633 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-07-19 21:28:44,635 INFO L168 Benchmark]: Toolchain (without parser) took 19978.77 ms. Allocated memory was 145.2 MB in the beginning and 494.4 MB in the end (delta: 349.2 MB). Free memory was 102.1 MB in the beginning and 366.9 MB in the end (delta: -264.8 MB). Peak memory consumption was 84.3 MB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,637 INFO L168 Benchmark]: CDTParser took 0.21 ms. Allocated memory is still 145.2 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,640 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.76 ms. Allocated memory is still 145.2 MB. Free memory was 101.7 MB in the beginning and 92.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,644 INFO L168 Benchmark]: Boogie Preprocessor took 34.90 ms. Allocated memory is still 145.2 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,645 INFO L168 Benchmark]: RCFGBuilder took 353.22 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 91.2 MB in the beginning and 171.0 MB in the end (delta: -79.8 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,645 INFO L168 Benchmark]: TraceAbstraction took 19331.52 ms. Allocated memory was 202.4 MB in the beginning and 494.4 MB in the end (delta: 292.0 MB). Free memory was 170.3 MB in the beginning and 366.9 MB in the end (delta: -196.6 MB). Peak memory consumption was 95.4 MB. Max. memory is 7.1 GB. [2020-07-19 21:28:44,649 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.21 ms. Allocated memory is still 145.2 MB. Free memory was 120.2 MB in the beginning and 120.0 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 251.76 ms. Allocated memory is still 145.2 MB. Free memory was 101.7 MB in the beginning and 92.5 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.1 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 34.90 ms. Allocated memory is still 145.2 MB. Free memory was 92.5 MB in the beginning and 91.2 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.4 MB. Max. memory is 7.1 GB. * RCFGBuilder took 353.22 ms. Allocated memory was 145.2 MB in the beginning and 202.4 MB in the end (delta: 57.1 MB). Free memory was 91.2 MB in the beginning and 171.0 MB in the end (delta: -79.8 MB). Peak memory consumption was 10.2 MB. Max. memory is 7.1 GB. * TraceAbstraction took 19331.52 ms. Allocated memory was 202.4 MB in the beginning and 494.4 MB in the end (delta: 292.0 MB). Free memory was 170.3 MB in the beginning and 366.9 MB in the end (delta: -196.6 MB). Peak memory consumption was 95.4 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 20; VAL [input=20] [L11] CALL, EXPR id(input) VAL [\old(x)=20] [L5] COND FALSE !(x==0) VAL [\old(x)=20, x=20] [L6] CALL, EXPR id(x-1) VAL [\old(x)=19] [L5] COND FALSE !(x==0) VAL [\old(x)=19, x=19] [L6] CALL, EXPR id(x-1) VAL [\old(x)=18] [L5] COND FALSE !(x==0) VAL [\old(x)=18, x=18] [L6] CALL, EXPR id(x-1) VAL [\old(x)=17] [L5] COND FALSE !(x==0) VAL [\old(x)=17, x=17] [L6] CALL, EXPR id(x-1) VAL [\old(x)=16] [L5] COND FALSE !(x==0) VAL [\old(x)=16, x=16] [L6] CALL, EXPR id(x-1) VAL [\old(x)=15] [L5] COND FALSE !(x==0) VAL [\old(x)=15, x=15] [L6] CALL, EXPR id(x-1) VAL [\old(x)=14] [L5] COND FALSE !(x==0) VAL [\old(x)=14, x=14] [L6] CALL, EXPR id(x-1) VAL [\old(x)=13] [L5] COND FALSE !(x==0) VAL [\old(x)=13, x=13] [L6] CALL, EXPR id(x-1) VAL [\old(x)=12] [L5] COND FALSE !(x==0) VAL [\old(x)=12, x=12] [L6] CALL, EXPR id(x-1) VAL [\old(x)=11] [L5] COND FALSE !(x==0) VAL [\old(x)=11, x=11] [L6] CALL, EXPR id(x-1) VAL [\old(x)=10] [L5] COND FALSE !(x==0) VAL [\old(x)=10, x=10] [L6] CALL, EXPR id(x-1) VAL [\old(x)=9] [L5] COND FALSE !(x==0) VAL [\old(x)=9, x=9] [L6] CALL, EXPR id(x-1) VAL [\old(x)=8] [L5] COND FALSE !(x==0) VAL [\old(x)=8, x=8] [L6] CALL, EXPR id(x-1) VAL [\old(x)=7] [L5] COND FALSE !(x==0) VAL [\old(x)=7, x=7] [L6] CALL, EXPR id(x-1) VAL [\old(x)=6] [L5] COND FALSE !(x==0) VAL [\old(x)=6, x=6] [L6] CALL, EXPR id(x-1) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=6, id(x-1)=5, x=6] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=7, id(x-1)=6, x=7] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=8, id(x-1)=7, x=8] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=9, id(x-1)=8, x=9] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=10, id(x-1)=9, x=10] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=11, id(x-1)=10, x=11] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=12, id(x-1)=11, x=12] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=13, id(x-1)=12, x=13] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=14, id(x-1)=13, x=14] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=15, id(x-1)=14, x=15] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=16, id(x-1)=15, x=16] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=17, id(x-1)=16, x=17] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=18, id(x-1)=17, x=18] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=19, id(x-1)=18, x=19] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=20, id(x-1)=19, x=20] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=20, input=20] [L11] int result = id(input); [L12] COND TRUE result == 20 VAL [input=20, result=20] [L13] __VERIFIER_error() VAL [input=20, result=20] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 19.1s, OverallIterations: 21, TraceHistogramMax: 21, AutomataDifference: 3.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 264 SDtfs, 877 SDslu, 1288 SDs, 0 SdLazy, 752 SolverSat, 229 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 2308 GetRequests, 1810 SyntacticMatches, 0 SemanticMatches, 498 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2850 ImplicationChecksByTransitivity, 5.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=75occurred in iteration=20, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 20 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.7s SatisfiabilityAnalysisTime, 9.1s InterpolantComputationTime, 2920 NumberOfCodeBlocks, 2920 NumberOfCodeBlocksAsserted, 40 NumberOfCheckSat, 2748 ConstructedInterpolants, 0 QuantifiedInterpolants, 602160 SizeOfPredicates, 228 NumberOfNonLiveVariables, 3268 ConjunctsInSsa, 456 ConjunctsInUnsatCore, 39 InterpolantComputations, 1 PerfectInterpolantSequences, 7600/15200 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...