/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc config/AutomizerReach.xml -s config/svcomp-Reach-64bit-Automizer_Default.epf -i ../sv-benchmarks/c/recursive-simple/id2_b3_o5.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-bitabs-178dd20 [2021-01-06 19:20:04,111 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-01-06 19:20:04,114 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-01-06 19:20:04,153 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-01-06 19:20:04,154 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-01-06 19:20:04,156 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-01-06 19:20:04,157 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-01-06 19:20:04,160 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-01-06 19:20:04,162 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-01-06 19:20:04,164 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-01-06 19:20:04,165 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-01-06 19:20:04,167 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-01-06 19:20:04,168 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-01-06 19:20:04,169 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-01-06 19:20:04,171 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-01-06 19:20:04,172 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-01-06 19:20:04,173 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-01-06 19:20:04,175 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-01-06 19:20:04,177 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-01-06 19:20:04,180 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-01-06 19:20:04,182 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-01-06 19:20:04,184 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-01-06 19:20:04,185 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-01-06 19:20:04,197 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-01-06 19:20:04,201 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-01-06 19:20:04,206 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-01-06 19:20:04,207 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-01-06 19:20:04,208 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-01-06 19:20:04,209 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-01-06 19:20:04,210 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-01-06 19:20:04,211 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-01-06 19:20:04,211 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-01-06 19:20:04,212 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-01-06 19:20:04,212 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-01-06 19:20:04,213 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-01-06 19:20:04,215 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-01-06 19:20:04,216 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2021-01-06 19:20:04,245 INFO L113 SettingsManager]: Loading preferences was successful [2021-01-06 19:20:04,245 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-01-06 19:20:04,247 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-01-06 19:20:04,247 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-01-06 19:20:04,248 INFO L138 SettingsManager]: * Use SBE=true [2021-01-06 19:20:04,248 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-01-06 19:20:04,248 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-01-06 19:20:04,249 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-01-06 19:20:04,249 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-01-06 19:20:04,249 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-01-06 19:20:04,250 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-01-06 19:20:04,250 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-01-06 19:20:04,250 INFO L138 SettingsManager]: * Use constant arrays=true [2021-01-06 19:20:04,251 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-01-06 19:20:04,251 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-01-06 19:20:04,251 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-01-06 19:20:04,252 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-01-06 19:20:04,252 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-01-06 19:20:04,253 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-01-06 19:20:04,253 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-01-06 19:20:04,253 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-01-06 19:20:04,254 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-01-06 19:20:04,254 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-01-06 19:20:04,254 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-01-06 19:20:04,255 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-01-06 19:20:04,255 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-01-06 19:20:04,642 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-01-06 19:20:04,672 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-01-06 19:20:04,676 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-01-06 19:20:04,678 INFO L271 PluginConnector]: Initializing CDTParser... [2021-01-06 19:20:04,679 INFO L275 PluginConnector]: CDTParser initialized [2021-01-06 19:20:04,680 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_b3_o5.c [2021-01-06 19:20:04,782 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c650cbf87/2bcb62694bd14955b76c72bbe524355b/FLAG32aa7f641 [2021-01-06 19:20:05,424 INFO L306 CDTParser]: Found 1 translation units. [2021-01-06 19:20:05,425 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c [2021-01-06 19:20:05,433 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c650cbf87/2bcb62694bd14955b76c72bbe524355b/FLAG32aa7f641 [2021-01-06 19:20:05,828 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-bitabs/releaseScripts/default/UAutomizer-linux/data/c650cbf87/2bcb62694bd14955b76c72bbe524355b [2021-01-06 19:20:05,832 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-01-06 19:20:05,835 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-01-06 19:20:05,840 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-01-06 19:20:05,840 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-01-06 19:20:05,844 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-01-06 19:20:05,845 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 07:20:05" (1/1) ... [2021-01-06 19:20:05,848 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7cb491e9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:05, skipping insertion in model container [2021-01-06 19:20:05,848 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.01 07:20:05" (1/1) ... [2021-01-06 19:20:05,857 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-01-06 19:20:05,874 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-01-06 19:20:06,096 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c[771,784] [2021-01-06 19:20:06,106 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 19:20:06,120 INFO L203 MainTranslator]: Completed pre-run [2021-01-06 19:20:06,137 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate-bitabs/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c[771,784] [2021-01-06 19:20:06,138 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-01-06 19:20:06,154 INFO L208 MainTranslator]: Completed translation [2021-01-06 19:20:06,154 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06 WrapperNode [2021-01-06 19:20:06,155 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-01-06 19:20:06,156 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-01-06 19:20:06,156 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-01-06 19:20:06,156 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-01-06 19:20:06,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,174 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,192 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-01-06 19:20:06,193 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-01-06 19:20:06,193 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-01-06 19:20:06,193 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-01-06 19:20:06,202 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,203 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,204 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,205 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,209 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,211 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,212 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... [2021-01-06 19:20:06,214 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-01-06 19:20:06,215 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-01-06 19:20:06,216 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-01-06 19:20:06,216 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-01-06 19:20:06,217 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (1/1) ... No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:06,308 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-01-06 19:20:06,308 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-01-06 19:20:06,309 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2021-01-06 19:20:06,309 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2021-01-06 19:20:06,309 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-01-06 19:20:06,309 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-01-06 19:20:06,309 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-01-06 19:20:06,309 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-01-06 19:20:06,549 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-01-06 19:20:06,550 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-01-06 19:20:06,553 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:06 BoogieIcfgContainer [2021-01-06 19:20:06,553 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-01-06 19:20:06,556 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-01-06 19:20:06,556 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-01-06 19:20:06,559 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-01-06 19:20:06,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.01 07:20:05" (1/3) ... [2021-01-06 19:20:06,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a9ae068 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 07:20:06, skipping insertion in model container [2021-01-06 19:20:06,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.01 07:20:06" (2/3) ... [2021-01-06 19:20:06,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a9ae068 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.01 07:20:06, skipping insertion in model container [2021-01-06 19:20:06,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:06" (3/3) ... [2021-01-06 19:20:06,564 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o5.c [2021-01-06 19:20:06,574 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-01-06 19:20:06,580 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-01-06 19:20:06,606 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-01-06 19:20:06,659 INFO L377 AbstractCegarLoop]: Interprodecural is true [2021-01-06 19:20:06,660 INFO L378 AbstractCegarLoop]: Hoare is true [2021-01-06 19:20:06,660 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-01-06 19:20:06,660 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-01-06 19:20:06,660 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-01-06 19:20:06,661 INFO L382 AbstractCegarLoop]: Difference is false [2021-01-06 19:20:06,661 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-01-06 19:20:06,661 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-01-06 19:20:06,683 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2021-01-06 19:20:06,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-01-06 19:20:06,706 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:06,707 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:06,707 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:06,714 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:06,714 INFO L82 PathProgramCache]: Analyzing trace with hash 794002500, now seen corresponding path program 1 times [2021-01-06 19:20:06,726 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:06,727 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1655666576] [2021-01-06 19:20:06,727 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:06,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,073 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 19:20:07,074 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1655666576] [2021-01-06 19:20:07,076 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:07,077 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-01-06 19:20:07,079 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505927275] [2021-01-06 19:20:07,089 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:07,090 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:07,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:07,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,108 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2021-01-06 19:20:07,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:07,154 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2021-01-06 19:20:07,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:07,156 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2021-01-06 19:20:07,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:07,165 INFO L225 Difference]: With dead ends: 36 [2021-01-06 19:20:07,165 INFO L226 Difference]: Without dead ends: 23 [2021-01-06 19:20:07,169 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,186 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-01-06 19:20:07,207 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-01-06 19:20:07,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-01-06 19:20:07,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2021-01-06 19:20:07,211 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2021-01-06 19:20:07,212 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:07,212 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2021-01-06 19:20:07,212 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:07,212 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2021-01-06 19:20:07,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 19:20:07,214 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:07,214 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:07,214 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-01-06 19:20:07,215 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:07,216 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:07,216 INFO L82 PathProgramCache]: Analyzing trace with hash 1040166181, now seen corresponding path program 1 times [2021-01-06 19:20:07,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:07,217 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1596131352] [2021-01-06 19:20:07,217 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:07,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,436 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 19:20:07,439 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1596131352] [2021-01-06 19:20:07,439 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:07,439 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-01-06 19:20:07,439 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2120066712] [2021-01-06 19:20:07,442 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:07,443 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:07,444 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:07,445 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,448 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2021-01-06 19:20:07,488 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:07,488 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2021-01-06 19:20:07,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:07,490 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2021-01-06 19:20:07,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:07,491 INFO L225 Difference]: With dead ends: 41 [2021-01-06 19:20:07,491 INFO L226 Difference]: Without dead ends: 29 [2021-01-06 19:20:07,493 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-01-06 19:20:07,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-01-06 19:20:07,501 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-01-06 19:20:07,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-01-06 19:20:07,503 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2021-01-06 19:20:07,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:07,503 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-01-06 19:20:07,504 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:07,504 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-01-06 19:20:07,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-01-06 19:20:07,505 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:07,505 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:07,505 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-01-06 19:20:07,506 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:07,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:07,507 INFO L82 PathProgramCache]: Analyzing trace with hash 1068795332, now seen corresponding path program 1 times [2021-01-06 19:20:07,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:07,507 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1226930825] [2021-01-06 19:20:07,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:07,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,679 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-01-06 19:20:07,679 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1226930825] [2021-01-06 19:20:07,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:07,680 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-01-06 19:20:07,680 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421579586] [2021-01-06 19:20:07,681 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 19:20:07,681 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:07,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 19:20:07,683 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-01-06 19:20:07,683 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 8 states. [2021-01-06 19:20:07,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:07,748 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2021-01-06 19:20:07,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 19:20:07,748 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2021-01-06 19:20:07,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:07,750 INFO L225 Difference]: With dead ends: 33 [2021-01-06 19:20:07,750 INFO L226 Difference]: Without dead ends: 29 [2021-01-06 19:20:07,751 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-01-06 19:20:07,752 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-01-06 19:20:07,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2021-01-06 19:20:07,757 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2021-01-06 19:20:07,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2021-01-06 19:20:07,759 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2021-01-06 19:20:07,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:07,759 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2021-01-06 19:20:07,759 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 19:20:07,760 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2021-01-06 19:20:07,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 19:20:07,761 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:07,761 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:07,761 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-01-06 19:20:07,762 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:07,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:07,762 INFO L82 PathProgramCache]: Analyzing trace with hash 1632008158, now seen corresponding path program 1 times [2021-01-06 19:20:07,763 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:07,763 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1570487255] [2021-01-06 19:20:07,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:07,786 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,886 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:07,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:07,915 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:07,916 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1570487255] [2021-01-06 19:20:07,917 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:07,917 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-01-06 19:20:07,917 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947881153] [2021-01-06 19:20:07,918 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:07,918 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:07,921 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:07,922 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,922 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2021-01-06 19:20:07,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:07,963 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2021-01-06 19:20:07,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:07,966 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2021-01-06 19:20:07,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:07,968 INFO L225 Difference]: With dead ends: 45 [2021-01-06 19:20:07,968 INFO L226 Difference]: Without dead ends: 33 [2021-01-06 19:20:07,970 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-01-06 19:20:07,971 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-01-06 19:20:07,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2021-01-06 19:20:07,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-01-06 19:20:07,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-01-06 19:20:07,989 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2021-01-06 19:20:07,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:07,989 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-01-06 19:20:07,990 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:07,990 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-01-06 19:20:07,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 19:20:07,994 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:07,994 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:07,995 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-01-06 19:20:07,995 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:07,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:07,996 INFO L82 PathProgramCache]: Analyzing trace with hash 1435494653, now seen corresponding path program 1 times [2021-01-06 19:20:07,996 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:07,997 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2061927796] [2021-01-06 19:20:07,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:08,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,102 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,162 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,284 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:08,285 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2061927796] [2021-01-06 19:20:08,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:08,286 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-01-06 19:20:08,286 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575409169] [2021-01-06 19:20:08,286 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 19:20:08,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:08,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 19:20:08,288 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-01-06 19:20:08,288 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2021-01-06 19:20:08,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:08,342 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2021-01-06 19:20:08,343 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 19:20:08,343 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2021-01-06 19:20:08,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:08,344 INFO L225 Difference]: With dead ends: 49 [2021-01-06 19:20:08,344 INFO L226 Difference]: Without dead ends: 37 [2021-01-06 19:20:08,345 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-01-06 19:20:08,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-01-06 19:20:08,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2021-01-06 19:20:08,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-01-06 19:20:08,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-01-06 19:20:08,352 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 24 [2021-01-06 19:20:08,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:08,353 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-01-06 19:20:08,353 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 19:20:08,353 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-01-06 19:20:08,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-01-06 19:20:08,354 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:08,355 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:08,355 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-01-06 19:20:08,355 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:08,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:08,356 INFO L82 PathProgramCache]: Analyzing trace with hash 1464123804, now seen corresponding path program 1 times [2021-01-06 19:20:08,356 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:08,356 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429560094] [2021-01-06 19:20:08,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:08,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,415 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,422 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,547 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:08,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,576 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:08,578 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429560094] [2021-01-06 19:20:08,582 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1991392471] [2021-01-06 19:20:08,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:08,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:08,650 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 20 conjunts are in the unsatisfiable core [2021-01-06 19:20:08,663 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:08,840 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-01-06 19:20:08,841 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:08,841 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2021-01-06 19:20:08,841 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502603665] [2021-01-06 19:20:08,843 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2021-01-06 19:20:08,843 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:08,844 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-01-06 19:20:08,844 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2021-01-06 19:20:08,845 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 12 states. [2021-01-06 19:20:08,941 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:08,941 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2021-01-06 19:20:08,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-01-06 19:20:08,942 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 24 [2021-01-06 19:20:08,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:08,945 INFO L225 Difference]: With dead ends: 41 [2021-01-06 19:20:08,945 INFO L226 Difference]: Without dead ends: 37 [2021-01-06 19:20:08,946 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 28 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:08,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-01-06 19:20:08,957 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 31. [2021-01-06 19:20:08,957 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2021-01-06 19:20:08,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-01-06 19:20:08,960 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2021-01-06 19:20:08,960 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:08,961 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-01-06 19:20:08,961 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2021-01-06 19:20:08,961 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-01-06 19:20:08,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-01-06 19:20:08,968 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:08,968 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:09,181 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-01-06 19:20:09,183 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:09,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:09,184 INFO L82 PathProgramCache]: Analyzing trace with hash 937223766, now seen corresponding path program 1 times [2021-01-06 19:20:09,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:09,185 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546300115] [2021-01-06 19:20:09,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:09,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,236 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,393 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:09,393 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546300115] [2021-01-06 19:20:09,394 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-01-06 19:20:09,394 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-01-06 19:20:09,395 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737267740] [2021-01-06 19:20:09,396 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-01-06 19:20:09,396 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:09,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-01-06 19:20:09,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2021-01-06 19:20:09,397 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2021-01-06 19:20:09,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:09,448 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2021-01-06 19:20:09,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-01-06 19:20:09,449 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2021-01-06 19:20:09,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:09,452 INFO L225 Difference]: With dead ends: 53 [2021-01-06 19:20:09,452 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 19:20:09,453 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2021-01-06 19:20:09,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 19:20:09,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-01-06 19:20:09,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-01-06 19:20:09,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-01-06 19:20:09,470 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 31 [2021-01-06 19:20:09,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:09,471 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-01-06 19:20:09,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-01-06 19:20:09,472 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-01-06 19:20:09,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-01-06 19:20:09,475 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:09,476 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:09,476 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-01-06 19:20:09,476 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:09,478 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:09,478 INFO L82 PathProgramCache]: Analyzing trace with hash 740710261, now seen corresponding path program 1 times [2021-01-06 19:20:09,478 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:09,479 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1238160509] [2021-01-06 19:20:09,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:09,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,519 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,560 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:09,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,676 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:09,676 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1238160509] [2021-01-06 19:20:09,676 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [411518611] [2021-01-06 19:20:09,677 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:09,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:09,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2021-01-06 19:20:09,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:09,803 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-01-06 19:20:09,803 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 19:20:09,804 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2021-01-06 19:20:09,805 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [598192720] [2021-01-06 19:20:09,805 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:09,806 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:09,807 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:09,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:09,811 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 5 states. [2021-01-06 19:20:09,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:09,828 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2021-01-06 19:20:09,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:09,828 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2021-01-06 19:20:09,830 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:09,834 INFO L225 Difference]: With dead ends: 45 [2021-01-06 19:20:09,834 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 19:20:09,836 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:09,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 19:20:09,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-01-06 19:20:09,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-01-06 19:20:09,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-01-06 19:20:09,850 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 31 [2021-01-06 19:20:09,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:09,851 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-01-06 19:20:09,851 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:09,851 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-01-06 19:20:09,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2021-01-06 19:20:09,852 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:09,854 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:10,068 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:10,069 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:10,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:10,070 INFO L82 PathProgramCache]: Analyzing trace with hash 769339412, now seen corresponding path program 1 times [2021-01-06 19:20:10,071 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:10,071 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [35842497] [2021-01-06 19:20:10,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:10,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,157 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,230 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,303 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,354 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:10,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [35842497] [2021-01-06 19:20:10,354 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315242257] [2021-01-06 19:20:10,355 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:10,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,409 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 27 conjunts are in the unsatisfiable core [2021-01-06 19:20:10,412 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:10,531 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-01-06 19:20:10,532 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:10,532 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2021-01-06 19:20:10,532 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065169681] [2021-01-06 19:20:10,534 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2021-01-06 19:20:10,534 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:10,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-01-06 19:20:10,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2021-01-06 19:20:10,535 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 15 states. [2021-01-06 19:20:10,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:10,683 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2021-01-06 19:20:10,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 19:20:10,683 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2021-01-06 19:20:10,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:10,684 INFO L225 Difference]: With dead ends: 63 [2021-01-06 19:20:10,684 INFO L226 Difference]: Without dead ends: 47 [2021-01-06 19:20:10,685 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 37 SyntacticMatches, 2 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=266, Unknown=0, NotChecked=0, Total=306 [2021-01-06 19:20:10,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-01-06 19:20:10,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2021-01-06 19:20:10,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2021-01-06 19:20:10,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2021-01-06 19:20:10,690 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2021-01-06 19:20:10,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:10,690 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2021-01-06 19:20:10,690 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2021-01-06 19:20:10,690 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2021-01-06 19:20:10,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 19:20:10,691 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:10,691 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:10,905 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:10,906 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:10,906 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:10,906 INFO L82 PathProgramCache]: Analyzing trace with hash 1806151381, now seen corresponding path program 1 times [2021-01-06 19:20:10,906 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:10,907 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1008639758] [2021-01-06 19:20:10,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:10,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:10,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:10,993 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,025 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,084 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 19:20:11,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1008639758] [2021-01-06 19:20:11,084 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [409900107] [2021-01-06 19:20:11,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:11,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,137 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2021-01-06 19:20:11,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:11,228 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-01-06 19:20:11,229 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 19:20:11,229 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2021-01-06 19:20:11,229 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1354548654] [2021-01-06 19:20:11,230 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:11,230 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:11,230 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:11,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:11,231 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 5 states. [2021-01-06 19:20:11,243 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:11,244 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2021-01-06 19:20:11,244 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:11,244 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2021-01-06 19:20:11,245 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:11,245 INFO L225 Difference]: With dead ends: 55 [2021-01-06 19:20:11,245 INFO L226 Difference]: Without dead ends: 41 [2021-01-06 19:20:11,246 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2021-01-06 19:20:11,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-01-06 19:20:11,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2021-01-06 19:20:11,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2021-01-06 19:20:11,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2021-01-06 19:20:11,251 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 38 [2021-01-06 19:20:11,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:11,251 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2021-01-06 19:20:11,251 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:11,251 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2021-01-06 19:20:11,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2021-01-06 19:20:11,252 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:11,252 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:11,467 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:11,468 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:11,469 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:11,469 INFO L82 PathProgramCache]: Analyzing trace with hash 1609637876, now seen corresponding path program 2 times [2021-01-06 19:20:11,470 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:11,470 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [801981493] [2021-01-06 19:20:11,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:11,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,684 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:11,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:11,714 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 19:20:11,714 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [801981493] [2021-01-06 19:20:11,715 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [552829531] [2021-01-06 19:20:11,715 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:11,768 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-01-06 19:20:11,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:11,770 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 32 conjunts are in the unsatisfiable core [2021-01-06 19:20:11,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:11,934 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-01-06 19:20:11,934 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2021-01-06 19:20:11,935 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 18 [2021-01-06 19:20:11,937 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [783763665] [2021-01-06 19:20:11,938 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2021-01-06 19:20:11,938 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:11,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-01-06 19:20:11,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2021-01-06 19:20:11,939 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 18 states. [2021-01-06 19:20:12,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:12,100 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-01-06 19:20:12,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-01-06 19:20:12,100 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2021-01-06 19:20:12,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:12,102 INFO L225 Difference]: With dead ends: 75 [2021-01-06 19:20:12,102 INFO L226 Difference]: Without dead ends: 57 [2021-01-06 19:20:12,105 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=374, Unknown=0, NotChecked=0, Total=420 [2021-01-06 19:20:12,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2021-01-06 19:20:12,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2021-01-06 19:20:12,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2021-01-06 19:20:12,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2021-01-06 19:20:12,116 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 38 [2021-01-06 19:20:12,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:12,116 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2021-01-06 19:20:12,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2021-01-06 19:20:12,116 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2021-01-06 19:20:12,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-01-06 19:20:12,118 INFO L414 BasicCegarLoop]: Found error trace [2021-01-06 19:20:12,118 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-01-06 19:20:12,332 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-01-06 19:20:12,333 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-01-06 19:20:12,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-01-06 19:20:12,334 INFO L82 PathProgramCache]: Analyzing trace with hash -1159827100, now seen corresponding path program 2 times [2021-01-06 19:20:12,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-01-06 19:20:12,335 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2074729813] [2021-01-06 19:20:12,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-01-06 19:20:12,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,381 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,418 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,454 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,552 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-01-06 19:20:12,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-01-06 19:20:12,594 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-01-06 19:20:12,594 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2074729813] [2021-01-06 19:20:12,595 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [631151140] [2021-01-06 19:20:12,595 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-bitabs/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 [2021-01-06 19:20:12,645 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2021-01-06 19:20:12,645 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-01-06 19:20:12,646 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2021-01-06 19:20:12,662 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-01-06 19:20:12,762 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-01-06 19:20:12,762 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2021-01-06 19:20:12,762 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [14] total 17 [2021-01-06 19:20:12,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751883356] [2021-01-06 19:20:12,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-01-06 19:20:12,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-01-06 19:20:12,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-01-06 19:20:12,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-01-06 19:20:12,765 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 5 states. [2021-01-06 19:20:12,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-01-06 19:20:12,779 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2021-01-06 19:20:12,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-01-06 19:20:12,779 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 45 [2021-01-06 19:20:12,780 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-01-06 19:20:12,781 INFO L225 Difference]: With dead ends: 51 [2021-01-06 19:20:12,781 INFO L226 Difference]: Without dead ends: 0 [2021-01-06 19:20:12,782 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2021-01-06 19:20:12,782 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-01-06 19:20:12,782 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-01-06 19:20:12,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2021-01-06 19:20:12,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-01-06 19:20:12,783 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 45 [2021-01-06 19:20:12,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-01-06 19:20:12,783 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-01-06 19:20:12,783 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-01-06 19:20:12,783 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-01-06 19:20:12,783 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-01-06 19:20:12,996 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-01-06 19:20:13,000 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-01-06 19:20:13,018 INFO L189 CegarLoopUtils]: For program point L17(line 17) no Hoare annotation was computed. [2021-01-06 19:20:13,018 INFO L189 CegarLoopUtils]: For program point L18-1(line 18) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point id2EXIT(lines 16 21) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L192 CegarLoopUtils]: At program point id2ENTRY(lines 16 21) the Hoare annotation is: true [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point L19(line 19) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point id2FINAL(lines 16 21) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L192 CegarLoopUtils]: At program point L18(line 18) the Hoare annotation is: true [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-01-06 19:20:13,019 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point L27(line 27) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point L26(lines 26 28) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L192 CegarLoopUtils]: At program point L25(line 25) the Hoare annotation is: true [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point L25-1(line 25) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point L23(lines 23 29) no Hoare annotation was computed. [2021-01-06 19:20:13,020 INFO L189 CegarLoopUtils]: For program point idFINAL(lines 9 14) no Hoare annotation was computed. [2021-01-06 19:20:13,021 INFO L189 CegarLoopUtils]: For program point L12(line 12) no Hoare annotation was computed. [2021-01-06 19:20:13,021 INFO L192 CegarLoopUtils]: At program point L11(line 11) the Hoare annotation is: true [2021-01-06 19:20:13,021 INFO L189 CegarLoopUtils]: For program point idEXIT(lines 9 14) no Hoare annotation was computed. [2021-01-06 19:20:13,021 INFO L189 CegarLoopUtils]: For program point L10(line 10) no Hoare annotation was computed. [2021-01-06 19:20:13,021 INFO L189 CegarLoopUtils]: For program point L11-1(line 11) no Hoare annotation was computed. [2021-01-06 19:20:13,021 INFO L192 CegarLoopUtils]: At program point idENTRY(lines 9 14) the Hoare annotation is: true [2021-01-06 19:20:13,027 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.01 07:20:13 BoogieIcfgContainer [2021-01-06 19:20:13,027 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-01-06 19:20:13,028 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-01-06 19:20:13,028 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-01-06 19:20:13,028 INFO L275 PluginConnector]: Witness Printer initialized [2021-01-06 19:20:13,028 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.01 07:20:06" (3/4) ... [2021-01-06 19:20:13,032 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-01-06 19:20:13,039 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id2 [2021-01-06 19:20:13,040 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2021-01-06 19:20:13,044 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2021-01-06 19:20:13,045 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2021-01-06 19:20:13,045 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 19:20:13,045 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-01-06 19:20:13,084 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id2_b3_o5.c-witness.graphml [2021-01-06 19:20:13,084 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-01-06 19:20:13,087 INFO L168 Benchmark]: Toolchain (without parser) took 7251.08 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 126.7 MB in the beginning and 69.8 MB in the end (delta: 56.9 MB). Peak memory consumption was 88.1 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,087 INFO L168 Benchmark]: CDTParser took 0.26 ms. Allocated memory is still 151.0 MB. Free memory is still 124.2 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-01-06 19:20:13,088 INFO L168 Benchmark]: CACSL2BoogieTranslator took 315.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 117.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,089 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.07 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,089 INFO L168 Benchmark]: Boogie Preprocessor took 21.39 ms. Allocated memory is still 151.0 MB. Free memory was 115.5 MB in the beginning and 114.6 MB in the end (delta: 882.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,090 INFO L168 Benchmark]: RCFGBuilder took 338.32 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 102.2 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,090 INFO L168 Benchmark]: TraceAbstraction took 6471.45 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 101.8 MB in the beginning and 72.4 MB in the end (delta: 29.4 MB). Peak memory consumption was 60.9 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,091 INFO L168 Benchmark]: Witness Printer took 56.86 ms. Allocated memory is still 181.4 MB. Free memory was 71.9 MB in the beginning and 69.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2021-01-06 19:20:13,094 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.26 ms. Allocated memory is still 151.0 MB. Free memory is still 124.2 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 315.39 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 117.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 36.07 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 115.5 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.39 ms. Allocated memory is still 151.0 MB. Free memory was 115.5 MB in the beginning and 114.6 MB in the end (delta: 882.9 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 338.32 ms. Allocated memory is still 151.0 MB. Free memory was 114.6 MB in the beginning and 102.2 MB in the end (delta: 12.4 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6471.45 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 101.8 MB in the beginning and 72.4 MB in the end (delta: 29.4 MB). Peak memory consumption was 60.9 MB. Max. memory is 8.0 GB. * Witness Printer took 56.86 ms. Allocated memory is still 181.4 MB. Free memory was 71.9 MB in the beginning and 69.8 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 27]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - StatisticsResult: Ultimate Automizer benchmark data CFG has 3 procedures, 24 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.3s, OverallIterations: 12, TraceHistogramMax: 3, AutomataDifference: 0.8s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 318 SDtfs, 39 SDslu, 1847 SDs, 0 SdLazy, 482 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.3s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 422 GetRequests, 301 SyntacticMatches, 5 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=51occurred in iteration=11, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 12 MinimizatonAttempts, 38 StatesRemovedByMinimization, 10 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 7 PreInvPairs, 7 NumberOfFragments, 5 HoareAnnotationTreeSize, 7 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 5 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 3.0s InterpolantComputationTime, 537 NumberOfCodeBlocks, 509 NumberOfCodeBlocksAsserted, 19 NumberOfCheckSat, 519 ConstructedInterpolants, 0 QuantifiedInterpolants, 49375 SizeOfPredicates, 15 NumberOfNonLiveVariables, 561 ConjunctsInSsa, 104 ConjunctsInUnsatCore, 18 InterpolantComputations, 9 PerfectInterpolantSequences, 179/231 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 correct! Received shutdown request...