/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-dev-4f750a8 [2020-12-22 07:03:06,290 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-22 07:03:06,297 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-22 07:03:06,340 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-22 07:03:06,341 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-22 07:03:06,343 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-22 07:03:06,345 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-22 07:03:06,348 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-22 07:03:06,350 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-22 07:03:06,352 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-22 07:03:06,353 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-22 07:03:06,355 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-22 07:03:06,355 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-22 07:03:06,357 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-22 07:03:06,358 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-22 07:03:06,360 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-22 07:03:06,361 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-22 07:03:06,374 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-22 07:03:06,377 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-22 07:03:06,379 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-22 07:03:06,381 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-22 07:03:06,383 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-22 07:03:06,385 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-22 07:03:06,386 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-22 07:03:06,390 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-12-22 07:03:06,394 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-22 07:03:06,396 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-22 07:03:06,397 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-22 07:03:06,398 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-22 07:03:06,399 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-22 07:03:06,400 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-22 07:03:06,401 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-22 07:03:06,401 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-22 07:03:06,402 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-22 07:03:06,403 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-22 07:03:06,404 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-22 07:03:06,407 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/config/svcomp-Reach-64bit-Automizer_Default.epf [2020-12-22 07:03:06,465 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-22 07:03:06,465 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-22 07:03:06,467 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-22 07:03:06,468 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-22 07:03:06,469 INFO L138 SettingsManager]: * Use SBE=true [2020-12-22 07:03:06,469 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-22 07:03:06,469 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-22 07:03:06,469 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-22 07:03:06,470 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-22 07:03:06,470 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-22 07:03:06,471 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-22 07:03:06,472 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-22 07:03:06,472 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-22 07:03:06,472 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-22 07:03:06,472 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-22 07:03:06,473 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-22 07:03:06,473 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-22 07:03:06,473 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:06,473 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-22 07:03:06,474 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-22 07:03:06,474 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-22 07:03:06,474 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-22 07:03:06,474 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-22 07:03:06,474 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-22 07:03:06,475 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-22 07:03:06,475 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/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-12-22 07:03:06,899 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-22 07:03:06,926 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-22 07:03:06,930 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-22 07:03:06,931 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-22 07:03:06,932 INFO L275 PluginConnector]: CDTParser initialized [2020-12-22 07:03:06,933 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../sv-benchmarks/c/recursive-simple/id2_b3_o5.c [2020-12-22 07:03:07,014 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a902df4/0113a6e823564de4b6fc7856fb781135/FLAG79b494219 [2020-12-22 07:03:07,675 INFO L306 CDTParser]: Found 1 translation units. [2020-12-22 07:03:07,676 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c [2020-12-22 07:03:07,684 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a902df4/0113a6e823564de4b6fc7856fb781135/FLAG79b494219 [2020-12-22 07:03:08,019 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/23a902df4/0113a6e823564de4b6fc7856fb781135 [2020-12-22 07:03:08,022 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-22 07:03:08,025 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-22 07:03:08,027 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:08,027 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-22 07:03:08,032 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-22 07:03:08,033 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,034 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ba26d58 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08, skipping insertion in model container [2020-12-22 07:03:08,035 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,044 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-22 07:03:08,061 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-22 07:03:08,227 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c[771,784] [2020-12-22 07:03:08,231 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:08,241 INFO L203 MainTranslator]: Completed pre-run [2020-12-22 07:03:08,259 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/releaseScripts/default/sv-benchmarks/c/recursive-simple/id2_b3_o5.c[771,784] [2020-12-22 07:03:08,260 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-22 07:03:08,277 INFO L208 MainTranslator]: Completed translation [2020-12-22 07:03:08,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08 WrapperNode [2020-12-22 07:03:08,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-22 07:03:08,279 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:08,279 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-22 07:03:08,280 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-22 07:03:08,289 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,297 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,315 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-22 07:03:08,316 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-22 07:03:08,316 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-22 07:03:08,317 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-22 07:03:08,326 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,326 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,328 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,328 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,332 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,334 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,336 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... [2020-12-22 07:03:08,338 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-22 07:03:08,339 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-22 07:03:08,339 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-22 07:03:08,339 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-22 07:03:08,340 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-22 07:03:08,445 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-22 07:03:08,446 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-22 07:03:08,446 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-12-22 07:03:08,446 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-12-22 07:03:08,446 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-22 07:03:08,447 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-22 07:03:08,447 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-12-22 07:03:08,447 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-12-22 07:03:08,897 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-22 07:03:08,897 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2020-12-22 07:03:08,899 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:08 BoogieIcfgContainer [2020-12-22 07:03:08,903 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-22 07:03:08,905 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-22 07:03:08,906 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-22 07:03:08,921 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-22 07:03:08,922 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.12 07:03:08" (1/3) ... [2020-12-22 07:03:08,926 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc0d641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:08, skipping insertion in model container [2020-12-22 07:03:08,926 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.12 07:03:08" (2/3) ... [2020-12-22 07:03:08,927 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2fc0d641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.12 07:03:08, skipping insertion in model container [2020-12-22 07:03:08,928 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:08" (3/3) ... [2020-12-22 07:03:08,932 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_b3_o5.c [2020-12-22 07:03:08,947 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-22 07:03:08,973 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-22 07:03:09,016 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-22 07:03:09,060 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-22 07:03:09,060 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-22 07:03:09,060 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-22 07:03:09,061 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-22 07:03:09,061 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-22 07:03:09,061 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-22 07:03:09,061 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-22 07:03:09,061 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-22 07:03:09,086 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-12-22 07:03:09,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-22 07:03:09,096 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:09,097 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:09,098 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:09,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:09,113 INFO L82 PathProgramCache]: Analyzing trace with hash 794002500, now seen corresponding path program 1 times [2020-12-22 07:03:09,126 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:09,126 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1475242055] [2020-12-22 07:03:09,127 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:09,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,428 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:09,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,462 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:09,463 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1475242055] [2020-12-22 07:03:09,464 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:09,464 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:09,465 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1947682804] [2020-12-22 07:03:09,470 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:09,471 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:09,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:09,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:09,487 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-12-22 07:03:09,557 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:09,558 INFO L93 Difference]: Finished difference Result 36 states and 41 transitions. [2020-12-22 07:03:09,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:09,562 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 10 [2020-12-22 07:03:09,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:09,573 INFO L225 Difference]: With dead ends: 36 [2020-12-22 07:03:09,573 INFO L226 Difference]: Without dead ends: 23 [2020-12-22 07:03:09,578 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 [2020-12-22 07:03:09,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-12-22 07:03:09,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-12-22 07:03:09,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-12-22 07:03:09,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 27 transitions. [2020-12-22 07:03:09,622 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 27 transitions. Word has length 10 [2020-12-22 07:03:09,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:09,623 INFO L481 AbstractCegarLoop]: Abstraction has 23 states and 27 transitions. [2020-12-22 07:03:09,623 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:09,623 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 27 transitions. [2020-12-22 07:03:09,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:09,625 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:09,625 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:09,626 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-22 07:03:09,626 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:09,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:09,627 INFO L82 PathProgramCache]: Analyzing trace with hash 1040166181, now seen corresponding path program 1 times [2020-12-22 07:03:09,627 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:09,628 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084800866] [2020-12-22 07:03:09,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:09,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,678 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:09,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:09,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,778 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:09,778 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084800866] [2020-12-22 07:03:09,779 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:09,779 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:09,779 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [579653957] [2020-12-22 07:03:09,781 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:09,781 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:09,782 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:09,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:09,782 INFO L87 Difference]: Start difference. First operand 23 states and 27 transitions. Second operand 5 states. [2020-12-22 07:03:09,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:09,808 INFO L93 Difference]: Finished difference Result 41 states and 49 transitions. [2020-12-22 07:03:09,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:09,808 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-12-22 07:03:09,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:09,810 INFO L225 Difference]: With dead ends: 41 [2020-12-22 07:03:09,810 INFO L226 Difference]: Without dead ends: 29 [2020-12-22 07:03:09,811 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 [2020-12-22 07:03:09,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-22 07:03:09,818 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-12-22 07:03:09,818 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 07:03:09,819 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-12-22 07:03:09,820 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-12-22 07:03:09,820 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:09,820 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-12-22 07:03:09,820 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:09,821 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-12-22 07:03:09,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-12-22 07:03:09,822 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:09,822 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-12-22 07:03:09,822 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-22 07:03:09,822 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:09,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:09,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1068795332, now seen corresponding path program 1 times [2020-12-22 07:03:09,823 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:09,824 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1084360326] [2020-12-22 07:03:09,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:09,850 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:09,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:09,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-22 07:03:10,035 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1084360326] [2020-12-22 07:03:10,035 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:10,035 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 07:03:10,036 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1577444153] [2020-12-22 07:03:10,036 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:10,037 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:10,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:10,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:10,038 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 8 states. [2020-12-22 07:03:10,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:10,099 INFO L93 Difference]: Finished difference Result 33 states and 37 transitions. [2020-12-22 07:03:10,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:10,100 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 17 [2020-12-22 07:03:10,100 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:10,102 INFO L225 Difference]: With dead ends: 33 [2020-12-22 07:03:10,102 INFO L226 Difference]: Without dead ends: 29 [2020-12-22 07:03:10,103 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 [2020-12-22 07:03:10,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-22 07:03:10,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2020-12-22 07:03:10,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-12-22 07:03:10,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 31 transitions. [2020-12-22 07:03:10,111 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 31 transitions. Word has length 17 [2020-12-22 07:03:10,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:10,111 INFO L481 AbstractCegarLoop]: Abstraction has 27 states and 31 transitions. [2020-12-22 07:03:10,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:10,112 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 31 transitions. [2020-12-22 07:03:10,113 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:10,113 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:10,113 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] [2020-12-22 07:03:10,114 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-12-22 07:03:10,114 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:10,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:10,115 INFO L82 PathProgramCache]: Analyzing trace with hash 1632008158, now seen corresponding path program 1 times [2020-12-22 07:03:10,115 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:10,115 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1401771553] [2020-12-22 07:03:10,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:10,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,165 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,192 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,244 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,270 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:10,271 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1401771553] [2020-12-22 07:03:10,272 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:10,272 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-12-22 07:03:10,272 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343341656] [2020-12-22 07:03:10,273 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:10,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:10,274 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:10,275 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-12-22 07:03:10,275 INFO L87 Difference]: Start difference. First operand 27 states and 31 transitions. Second operand 5 states. [2020-12-22 07:03:10,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:10,297 INFO L93 Difference]: Finished difference Result 45 states and 52 transitions. [2020-12-22 07:03:10,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:10,298 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-12-22 07:03:10,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:10,299 INFO L225 Difference]: With dead ends: 45 [2020-12-22 07:03:10,300 INFO L226 Difference]: Without dead ends: 33 [2020-12-22 07:03:10,301 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 [2020-12-22 07:03:10,301 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-12-22 07:03:10,307 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 31. [2020-12-22 07:03:10,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-22 07:03:10,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-12-22 07:03:10,309 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2020-12-22 07:03:10,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:10,309 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-12-22 07:03:10,310 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:10,310 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-12-22 07:03:10,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:10,311 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:10,311 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] [2020-12-22 07:03:10,312 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-12-22 07:03:10,312 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:10,313 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:10,313 INFO L82 PathProgramCache]: Analyzing trace with hash 1435494653, now seen corresponding path program 1 times [2020-12-22 07:03:10,313 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:10,314 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [596294385] [2020-12-22 07:03:10,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:10,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,464 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,616 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:10,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [596294385] [2020-12-22 07:03:10,617 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:10,618 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 07:03:10,618 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [285117407] [2020-12-22 07:03:10,619 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:10,619 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:10,621 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:10,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:10,623 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-12-22 07:03:10,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:10,701 INFO L93 Difference]: Finished difference Result 49 states and 57 transitions. [2020-12-22 07:03:10,702 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:10,703 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-12-22 07:03:10,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:10,708 INFO L225 Difference]: With dead ends: 49 [2020-12-22 07:03:10,709 INFO L226 Difference]: Without dead ends: 37 [2020-12-22 07:03:10,712 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 [2020-12-22 07:03:10,713 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-22 07:03:10,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-12-22 07:03:10,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-22 07:03:10,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-12-22 07:03:10,739 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 24 [2020-12-22 07:03:10,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:10,742 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-12-22 07:03:10,742 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:10,742 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-12-22 07:03:10,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-12-22 07:03:10,743 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:10,744 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] [2020-12-22 07:03:10,744 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-12-22 07:03:10,744 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:10,745 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:10,745 INFO L82 PathProgramCache]: Analyzing trace with hash 1464123804, now seen corresponding path program 1 times [2020-12-22 07:03:10,746 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:10,746 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1716394995] [2020-12-22 07:03:10,747 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:10,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:10,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:10,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,009 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,045 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:11,046 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1716394995] [2020-12-22 07:03:11,050 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1871822948] [2020-12-22 07:03:11,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:11,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 81 conjuncts, 20 conjunts are in the unsatisfiable core [2020-12-22 07:03:11,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:11,295 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-12-22 07:03:11,295 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:11,296 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11] total 12 [2020-12-22 07:03:11,296 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1836014716] [2020-12-22 07:03:11,297 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-12-22 07:03:11,297 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:11,298 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-12-22 07:03:11,298 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-12-22 07:03:11,298 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 12 states. [2020-12-22 07:03:11,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:11,393 INFO L93 Difference]: Finished difference Result 41 states and 45 transitions. [2020-12-22 07:03:11,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-12-22 07:03:11,394 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 24 [2020-12-22 07:03:11,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:11,395 INFO L225 Difference]: With dead ends: 41 [2020-12-22 07:03:11,395 INFO L226 Difference]: Without dead ends: 37 [2020-12-22 07:03:11,396 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 [2020-12-22 07:03:11,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-22 07:03:11,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 31. [2020-12-22 07:03:11,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-12-22 07:03:11,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-12-22 07:03:11,402 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 24 [2020-12-22 07:03:11,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:11,403 INFO L481 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-12-22 07:03:11,403 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-12-22 07:03:11,403 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-12-22 07:03:11,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-22 07:03:11,404 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:11,404 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] [2020-12-22 07:03:11,618 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-22 07:03:11,619 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:11,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:11,620 INFO L82 PathProgramCache]: Analyzing trace with hash 937223766, now seen corresponding path program 1 times [2020-12-22 07:03:11,621 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:11,622 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110661782] [2020-12-22 07:03:11,622 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:11,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,661 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,671 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,723 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,794 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:11,794 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110661782] [2020-12-22 07:03:11,794 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-22 07:03:11,795 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-12-22 07:03:11,795 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [555840877] [2020-12-22 07:03:11,795 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-22 07:03:11,796 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:11,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-22 07:03:11,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-12-22 07:03:11,797 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-12-22 07:03:11,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:11,843 INFO L93 Difference]: Finished difference Result 53 states and 60 transitions. [2020-12-22 07:03:11,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-22 07:03:11,843 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 31 [2020-12-22 07:03:11,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:11,845 INFO L225 Difference]: With dead ends: 53 [2020-12-22 07:03:11,845 INFO L226 Difference]: Without dead ends: 41 [2020-12-22 07:03:11,846 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 [2020-12-22 07:03:11,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-22 07:03:11,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-12-22 07:03:11,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-22 07:03:11,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-12-22 07:03:11,853 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 31 [2020-12-22 07:03:11,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:11,853 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-12-22 07:03:11,854 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-22 07:03:11,854 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-12-22 07:03:11,855 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-22 07:03:11,855 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:11,855 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] [2020-12-22 07:03:11,856 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-12-22 07:03:11,856 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:11,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:11,856 INFO L82 PathProgramCache]: Analyzing trace with hash 740710261, now seen corresponding path program 1 times [2020-12-22 07:03:11,857 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:11,857 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490801953] [2020-12-22 07:03:11,857 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:11,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,883 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:11,988 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:11,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,064 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:12,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,104 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:12,105 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490801953] [2020-12-22 07:03:12,105 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [185973974] [2020-12-22 07:03:12,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:12,158 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,159 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 8 conjunts are in the unsatisfiable core [2020-12-22 07:03:12,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:12,250 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2020-12-22 07:03:12,251 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-22 07:03:12,251 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2020-12-22 07:03:12,251 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278630640] [2020-12-22 07:03:12,252 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:12,253 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:12,254 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:12,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-12-22 07:03:12,259 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 5 states. [2020-12-22 07:03:12,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:12,277 INFO L93 Difference]: Finished difference Result 45 states and 49 transitions. [2020-12-22 07:03:12,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:12,277 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 31 [2020-12-22 07:03:12,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:12,283 INFO L225 Difference]: With dead ends: 45 [2020-12-22 07:03:12,284 INFO L226 Difference]: Without dead ends: 41 [2020-12-22 07:03:12,285 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 [2020-12-22 07:03:12,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-22 07:03:12,301 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-12-22 07:03:12,302 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-22 07:03:12,303 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-12-22 07:03:12,303 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 31 [2020-12-22 07:03:12,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:12,304 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-12-22 07:03:12,304 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:12,305 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-12-22 07:03:12,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-12-22 07:03:12,308 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:12,309 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] [2020-12-22 07:03:12,522 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:12,523 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:12,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:12,524 INFO L82 PathProgramCache]: Analyzing trace with hash 769339412, now seen corresponding path program 1 times [2020-12-22 07:03:12,525 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:12,525 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1810425784] [2020-12-22 07:03:12,526 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:12,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:12,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:12,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,657 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:12,660 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:12,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,743 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:12,744 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1810425784] [2020-12-22 07:03:12,744 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969295272] [2020-12-22 07:03:12,744 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:12,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:12,807 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 27 conjunts are in the unsatisfiable core [2020-12-22 07:03:12,810 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:12,904 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-12-22 07:03:12,905 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:12,905 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 15 [2020-12-22 07:03:12,905 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1711897522] [2020-12-22 07:03:12,906 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-12-22 07:03:12,906 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:12,906 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-12-22 07:03:12,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-12-22 07:03:12,907 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 15 states. [2020-12-22 07:03:13,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:13,051 INFO L93 Difference]: Finished difference Result 63 states and 71 transitions. [2020-12-22 07:03:13,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 07:03:13,052 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 31 [2020-12-22 07:03:13,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:13,053 INFO L225 Difference]: With dead ends: 63 [2020-12-22 07:03:13,053 INFO L226 Difference]: Without dead ends: 47 [2020-12-22 07:03:13,053 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 [2020-12-22 07:03:13,054 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-12-22 07:03:13,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 35. [2020-12-22 07:03:13,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-12-22 07:03:13,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-12-22 07:03:13,059 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 31 [2020-12-22 07:03:13,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:13,059 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-12-22 07:03:13,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-12-22 07:03:13,059 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-12-22 07:03:13,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-22 07:03:13,060 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:13,060 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] [2020-12-22 07:03:13,274 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:13,275 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:13,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:13,277 INFO L82 PathProgramCache]: Analyzing trace with hash 1806151381, now seen corresponding path program 1 times [2020-12-22 07:03:13,277 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:13,278 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1612038110] [2020-12-22 07:03:13,278 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:13,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,535 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 07:03:13,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1612038110] [2020-12-22 07:03:13,535 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [620404162] [2020-12-22 07:03:13,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:13,578 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,579 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-22 07:03:13,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:13,658 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2020-12-22 07:03:13,659 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-22 07:03:13,659 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [11] total 14 [2020-12-22 07:03:13,660 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1584651346] [2020-12-22 07:03:13,660 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:13,661 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:13,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:13,662 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-12-22 07:03:13,662 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 5 states. [2020-12-22 07:03:13,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:13,677 INFO L93 Difference]: Finished difference Result 55 states and 62 transitions. [2020-12-22 07:03:13,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:13,677 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-12-22 07:03:13,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:13,679 INFO L225 Difference]: With dead ends: 55 [2020-12-22 07:03:13,679 INFO L226 Difference]: Without dead ends: 41 [2020-12-22 07:03:13,680 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 [2020-12-22 07:03:13,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-12-22 07:03:13,684 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 39. [2020-12-22 07:03:13,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-12-22 07:03:13,685 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-12-22 07:03:13,686 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 38 [2020-12-22 07:03:13,686 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:13,686 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-12-22 07:03:13,686 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:13,686 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-12-22 07:03:13,687 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-12-22 07:03:13,688 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:13,688 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] [2020-12-22 07:03:13,902 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:13,903 INFO L429 AbstractCegarLoop]: === Iteration 11 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:13,904 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:13,904 INFO L82 PathProgramCache]: Analyzing trace with hash 1609637876, now seen corresponding path program 2 times [2020-12-22 07:03:13,904 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:13,904 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1524646587] [2020-12-22 07:03:13,904 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:13,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,942 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:13,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:13,997 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,180 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 4 proven. 8 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 07:03:14,180 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1524646587] [2020-12-22 07:03:14,180 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105596912] [2020-12-22 07:03:14,181 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:14,231 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-22 07:03:14,231 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:14,233 INFO L263 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 32 conjunts are in the unsatisfiable core [2020-12-22 07:03:14,235 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:14,382 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-22 07:03:14,382 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-22 07:03:14,382 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 17] total 18 [2020-12-22 07:03:14,383 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1468827872] [2020-12-22 07:03:14,383 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-22 07:03:14,383 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:14,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-22 07:03:14,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-12-22 07:03:14,385 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 18 states. [2020-12-22 07:03:14,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:14,547 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2020-12-22 07:03:14,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-12-22 07:03:14,547 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 38 [2020-12-22 07:03:14,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:14,549 INFO L225 Difference]: With dead ends: 75 [2020-12-22 07:03:14,550 INFO L226 Difference]: Without dead ends: 57 [2020-12-22 07:03:14,554 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 [2020-12-22 07:03:14,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-12-22 07:03:14,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 51. [2020-12-22 07:03:14,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-12-22 07:03:14,565 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 55 transitions. [2020-12-22 07:03:14,565 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 55 transitions. Word has length 38 [2020-12-22 07:03:14,565 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:14,566 INFO L481 AbstractCegarLoop]: Abstraction has 51 states and 55 transitions. [2020-12-22 07:03:14,566 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-22 07:03:14,566 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 55 transitions. [2020-12-22 07:03:14,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-12-22 07:03:14,570 INFO L414 BasicCegarLoop]: Found error trace [2020-12-22 07:03:14,571 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] [2020-12-22 07:03:14,785 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2020-12-22 07:03:14,786 INFO L429 AbstractCegarLoop]: === Iteration 12 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-22 07:03:14,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-22 07:03:14,787 INFO L82 PathProgramCache]: Analyzing trace with hash -1159827100, now seen corresponding path program 2 times [2020-12-22 07:03:14,787 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-22 07:03:14,788 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [998663393] [2020-12-22 07:03:14,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-22 07:03:14,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,834 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:14,967 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:14,970 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-12-22 07:03:15,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-22 07:03:15,044 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 12 proven. 8 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-12-22 07:03:15,044 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [998663393] [2020-12-22 07:03:15,045 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359976006] [2020-12-22 07:03:15,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:15,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 1 check-sat command(s) [2020-12-22 07:03:15,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-22 07:03:15,083 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 10 conjunts are in the unsatisfiable core [2020-12-22 07:03:15,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-22 07:03:15,172 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2020-12-22 07:03:15,172 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-12-22 07:03:15,173 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [14] total 17 [2020-12-22 07:03:15,173 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531702179] [2020-12-22 07:03:15,173 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-22 07:03:15,174 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-22 07:03:15,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-22 07:03:15,175 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=239, Unknown=0, NotChecked=0, Total=272 [2020-12-22 07:03:15,175 INFO L87 Difference]: Start difference. First operand 51 states and 55 transitions. Second operand 5 states. [2020-12-22 07:03:15,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-22 07:03:15,184 INFO L93 Difference]: Finished difference Result 51 states and 55 transitions. [2020-12-22 07:03:15,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-22 07:03:15,185 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 45 [2020-12-22 07:03:15,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-22 07:03:15,186 INFO L225 Difference]: With dead ends: 51 [2020-12-22 07:03:15,186 INFO L226 Difference]: Without dead ends: 0 [2020-12-22 07:03:15,187 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 [2020-12-22 07:03:15,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-22 07:03:15,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-22 07:03:15,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-22 07:03:15,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-22 07:03:15,188 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 45 [2020-12-22 07:03:15,188 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-22 07:03:15,188 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-22 07:03:15,188 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-22 07:03:15,188 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-22 07:03:15,188 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-22 07:03:15,402 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-22 07:03:15,407 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-22 07:03:15,425 INFO L189 CegarLoopUtils]: For program point L17(line 17) no Hoare annotation was computed. [2020-12-22 07:03:15,425 INFO L189 CegarLoopUtils]: For program point L18-1(line 18) no Hoare annotation was computed. [2020-12-22 07:03:15,425 INFO L189 CegarLoopUtils]: For program point id2EXIT(lines 16 21) no Hoare annotation was computed. [2020-12-22 07:03:15,425 INFO L192 CegarLoopUtils]: At program point id2ENTRY(lines 16 21) the Hoare annotation is: true [2020-12-22 07:03:15,425 INFO L189 CegarLoopUtils]: For program point L19(line 19) no Hoare annotation was computed. [2020-12-22 07:03:15,425 INFO L189 CegarLoopUtils]: For program point id2FINAL(lines 16 21) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L192 CegarLoopUtils]: At program point L18(line 18) the Hoare annotation is: true [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point L27(line 27) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point L26(lines 26 28) no Hoare annotation was computed. [2020-12-22 07:03:15,426 INFO L192 CegarLoopUtils]: At program point L25(line 25) the Hoare annotation is: true [2020-12-22 07:03:15,426 INFO L189 CegarLoopUtils]: For program point L25-1(line 25) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 27) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point L23(lines 23 29) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point idFINAL(lines 9 14) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point L12(line 12) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L192 CegarLoopUtils]: At program point L11(line 11) the Hoare annotation is: true [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point idEXIT(lines 9 14) no Hoare annotation was computed. [2020-12-22 07:03:15,427 INFO L189 CegarLoopUtils]: For program point L10(line 10) no Hoare annotation was computed. [2020-12-22 07:03:15,428 INFO L189 CegarLoopUtils]: For program point L11-1(line 11) no Hoare annotation was computed. [2020-12-22 07:03:15,428 INFO L192 CegarLoopUtils]: At program point idENTRY(lines 9 14) the Hoare annotation is: true [2020-12-22 07:03:15,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.12 07:03:15 BoogieIcfgContainer [2020-12-22 07:03:15,436 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-22 07:03:15,437 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-22 07:03:15,437 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-22 07:03:15,437 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-22 07:03:15,438 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.12 07:03:08" (3/4) ... [2020-12-22 07:03:15,442 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-22 07:03:15,452 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id2 [2020-12-22 07:03:15,452 INFO L354 RCFGBacktranslator]: Ignoring RootEdge to procedure id [2020-12-22 07:03:15,457 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 9 nodes and edges [2020-12-22 07:03:15,458 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-22 07:03:15,458 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 07:03:15,458 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-22 07:03:15,499 INFO L141 WitnessManager]: Wrote witness to /storage/repos/svcomp/c/recursive-simple/id2_b3_o5.c-witness.graphml [2020-12-22 07:03:15,500 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-22 07:03:15,502 INFO L168 Benchmark]: Toolchain (without parser) took 7476.42 ms. Allocated memory was 153.1 MB in the beginning and 199.2 MB in the end (delta: 46.1 MB). Free memory was 128.7 MB in the beginning and 118.6 MB in the end (delta: 10.1 MB). Peak memory consumption was 56.7 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,503 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 153.1 MB. Free memory is still 125.8 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-12-22 07:03:15,503 INFO L168 Benchmark]: CACSL2BoogieTranslator took 251.49 ms. Allocated memory is still 153.1 MB. Free memory was 128.5 MB in the beginning and 118.5 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,504 INFO L168 Benchmark]: Boogie Procedure Inliner took 36.17 ms. Allocated memory is still 153.1 MB. Free memory was 118.5 MB in the beginning and 117.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,504 INFO L168 Benchmark]: Boogie Preprocessor took 21.79 ms. Allocated memory is still 153.1 MB. Free memory was 117.2 MB in the beginning and 116.2 MB in the end (delta: 957.6 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,505 INFO L168 Benchmark]: RCFGBuilder took 564.59 ms. Allocated memory is still 153.1 MB. Free memory was 116.1 MB in the beginning and 135.8 MB in the end (delta: -19.7 MB). Peak memory consumption was 15.5 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,506 INFO L168 Benchmark]: TraceAbstraction took 6531.00 ms. Allocated memory was 153.1 MB in the beginning and 199.2 MB in the end (delta: 46.1 MB). Free memory was 135.6 MB in the beginning and 121.2 MB in the end (delta: 14.4 MB). Peak memory consumption was 61.1 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,506 INFO L168 Benchmark]: Witness Printer took 62.81 ms. Allocated memory is still 199.2 MB. Free memory was 121.2 MB in the beginning and 118.6 MB in the end (delta: 2.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-12-22 07:03:15,509 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 153.1 MB. Free memory is still 125.8 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 251.49 ms. Allocated memory is still 153.1 MB. Free memory was 128.5 MB in the beginning and 118.5 MB in the end (delta: 10.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Procedure Inliner took 36.17 ms. Allocated memory is still 153.1 MB. Free memory was 118.5 MB in the beginning and 117.2 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 21.79 ms. Allocated memory is still 153.1 MB. Free memory was 117.2 MB in the beginning and 116.2 MB in the end (delta: 957.6 kB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 564.59 ms. Allocated memory is still 153.1 MB. Free memory was 116.1 MB in the beginning and 135.8 MB in the end (delta: -19.7 MB). Peak memory consumption was 15.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 6531.00 ms. Allocated memory was 153.1 MB in the beginning and 199.2 MB in the end (delta: 46.1 MB). Free memory was 135.6 MB in the beginning and 121.2 MB in the end (delta: 14.4 MB). Peak memory consumption was 61.1 MB. Max. memory is 8.0 GB. * Witness Printer took 62.81 ms. Allocated memory is still 199.2 MB. Free memory was 121.2 MB in the beginning and 118.6 MB in the end (delta: 2.6 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, 3.1s 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...