/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-3af5e1f [2020-09-04 13:21:46,753 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-09-04 13:21:46,758 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-09-04 13:21:46,801 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-09-04 13:21:46,802 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-09-04 13:21:46,809 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-09-04 13:21:46,813 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-09-04 13:21:46,817 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-09-04 13:21:46,820 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-09-04 13:21:46,823 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-09-04 13:21:46,826 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-09-04 13:21:46,827 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-09-04 13:21:46,827 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-09-04 13:21:46,830 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-09-04 13:21:46,833 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-09-04 13:21:46,835 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-09-04 13:21:46,837 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-09-04 13:21:46,838 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-09-04 13:21:46,840 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-09-04 13:21:46,842 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-09-04 13:21:46,848 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-09-04 13:21:46,849 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-09-04 13:21:46,850 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-09-04 13:21:46,851 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-09-04 13:21:46,854 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-09-04 13:21:46,862 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-09-04 13:21:46,863 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-09-04 13:21:46,864 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-09-04 13:21:46,865 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-09-04 13:21:46,890 INFO L113 SettingsManager]: Loading preferences was successful [2020-09-04 13:21:46,890 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-09-04 13:21:46,892 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-09-04 13:21:46,892 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-09-04 13:21:46,892 INFO L138 SettingsManager]: * Use SBE=true [2020-09-04 13:21:46,892 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-09-04 13:21:46,893 INFO L138 SettingsManager]: * sizeof long=4 [2020-09-04 13:21:46,893 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-09-04 13:21:46,893 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-09-04 13:21:46,893 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-09-04 13:21:46,893 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * sizeof long double=12 [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * Use constant arrays=true [2020-09-04 13:21:46,894 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-09-04 13:21:46,895 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-09-04 13:21:46,895 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-09-04 13:21:46,895 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-09-04 13:21:46,895 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-09-04 13:21:46,896 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-09-04 13:21:46,896 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-09-04 13:21:46,896 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-09-04 13:21:46,896 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-09-04 13:21:46,896 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-09-04 13:21:46,897 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-09-04 13:21:46,897 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-09-04 13:21:46,897 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-09-04 13:21:46,897 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-09-04 13:21:47,384 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-09-04 13:21:47,411 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-09-04 13:21:47,417 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-09-04 13:21:47,420 INFO L271 PluginConnector]: Initializing CDTParser... [2020-09-04 13:21:47,420 INFO L275 PluginConnector]: CDTParser initialized [2020-09-04 13:21:47,421 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-09-04 13:21:47,523 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bde8685f9/a969a26299604edf8dbeb78fa95ac02e/FLAGac94b55cf [2020-09-04 13:21:48,146 INFO L306 CDTParser]: Found 1 translation units. [2020-09-04 13:21:48,147 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/recursive-simple/id_i5_o5-1.c [2020-09-04 13:21:48,154 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bde8685f9/a969a26299604edf8dbeb78fa95ac02e/FLAGac94b55cf [2020-09-04 13:21:48,506 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/bde8685f9/a969a26299604edf8dbeb78fa95ac02e [2020-09-04 13:21:48,523 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-09-04 13:21:48,525 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-09-04 13:21:48,526 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-09-04 13:21:48,527 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-09-04 13:21:48,531 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-09-04 13:21:48,532 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,537 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@678b2c62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48, skipping insertion in model container [2020-09-04 13:21:48,537 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,547 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-09-04 13:21:48,574 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-09-04 13:21:48,852 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:21:48,856 INFO L203 MainTranslator]: Completed pre-run [2020-09-04 13:21:48,872 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-09-04 13:21:48,889 INFO L208 MainTranslator]: Completed translation [2020-09-04 13:21:48,890 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48 WrapperNode [2020-09-04 13:21:48,890 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-09-04 13:21:48,891 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-09-04 13:21:48,891 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-09-04 13:21:48,891 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-09-04 13:21:48,906 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,907 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,913 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,913 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,918 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,921 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,922 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... [2020-09-04 13:21:48,924 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-09-04 13:21:48,925 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-09-04 13:21:48,925 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-09-04 13:21:48,925 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-09-04 13:21:48,927 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:21:49,115 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-09-04 13:21:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-09-04 13:21:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-09-04 13:21:49,116 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-09-04 13:21:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-09-04 13:21:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-09-04 13:21:49,116 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-09-04 13:21:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-09-04 13:21:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-09-04 13:21:49,117 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-09-04 13:21:49,307 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-09-04 13:21:49,308 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-09-04 13:21:49,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:21:49 BoogieIcfgContainer [2020-09-04 13:21:49,312 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-09-04 13:21:49,314 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-09-04 13:21:49,314 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-09-04 13:21:49,318 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-09-04 13:21:49,319 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 04.09 01:21:48" (1/3) ... [2020-09-04 13:21:49,320 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c3571e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:21:49, skipping insertion in model container [2020-09-04 13:21:49,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 04.09 01:21:48" (2/3) ... [2020-09-04 13:21:49,321 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@16c3571e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 04.09 01:21:49, skipping insertion in model container [2020-09-04 13:21:49,321 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 04.09 01:21:49" (3/3) ... [2020-09-04 13:21:49,324 INFO L109 eAbstractionObserver]: Analyzing ICFG id_i5_o5-1.c [2020-09-04 13:21:49,334 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-09-04 13:21:49,343 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-09-04 13:21:49,366 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-09-04 13:21:49,399 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-09-04 13:21:49,400 INFO L376 AbstractCegarLoop]: Hoare is true [2020-09-04 13:21:49,400 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-09-04 13:21:49,400 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-09-04 13:21:49,400 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-09-04 13:21:49,401 INFO L380 AbstractCegarLoop]: Difference is false [2020-09-04 13:21:49,401 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-09-04 13:21:49,401 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-09-04 13:21:49,422 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states. [2020-09-04 13:21:49,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-09-04 13:21:49,430 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:49,431 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:49,432 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:49,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:49,439 INFO L82 PathProgramCache]: Analyzing trace with hash -872342019, now seen corresponding path program 1 times [2020-09-04 13:21:49,450 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:49,450 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1806393579] [2020-09-04 13:21:49,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:49,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:49,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:21:49,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:49,715 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:21:49,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:49,836 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-09-04 13:21:49,837 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1806393579] [2020-09-04 13:21:49,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-09-04 13:21:49,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-09-04 13:21:49,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948815205] [2020-09-04 13:21:49,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-09-04 13:21:49,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:21:49,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-09-04 13:21:49,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-09-04 13:21:49,864 INFO L87 Difference]: Start difference. First operand 20 states. Second operand 5 states. [2020-09-04 13:21:49,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:21:49,973 INFO L93 Difference]: Finished difference Result 30 states and 33 transitions. [2020-09-04 13:21:49,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-09-04 13:21:49,975 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-09-04 13:21:49,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:21:49,989 INFO L225 Difference]: With dead ends: 30 [2020-09-04 13:21:49,989 INFO L226 Difference]: Without dead ends: 18 [2020-09-04 13:21:49,994 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-09-04 13:21:50,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-09-04 13:21:50,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-09-04 13:21:50,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-09-04 13:21:50,056 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 19 transitions. [2020-09-04 13:21:50,059 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 19 transitions. Word has length 13 [2020-09-04 13:21:50,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:21:50,060 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 19 transitions. [2020-09-04 13:21:50,060 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-09-04 13:21:50,060 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 19 transitions. [2020-09-04 13:21:50,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-09-04 13:21:50,063 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:50,063 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:50,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-09-04 13:21:50,064 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:50,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:50,065 INFO L82 PathProgramCache]: Analyzing trace with hash -953570577, now seen corresponding path program 1 times [2020-09-04 13:21:50,065 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:50,065 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [541356973] [2020-09-04 13:21:50,066 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:50,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:21:50,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:21:50,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:50,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,217 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:21:50,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [541356973] [2020-09-04 13:21:50,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1054240153] [2020-09-04 13:21:50,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:21:50,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,272 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 6 conjunts are in the unsatisfiable core [2020-09-04 13:21:50,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:21:50,429 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-09-04 13:21:50,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:21:50,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 8 [2020-09-04 13:21:50,432 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643388474] [2020-09-04 13:21:50,433 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-09-04 13:21:50,433 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:21:50,433 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-09-04 13:21:50,434 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-09-04 13:21:50,434 INFO L87 Difference]: Start difference. First operand 18 states and 19 transitions. Second operand 8 states. [2020-09-04 13:21:50,504 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:21:50,505 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2020-09-04 13:21:50,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-09-04 13:21:50,506 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 19 [2020-09-04 13:21:50,506 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:21:50,507 INFO L225 Difference]: With dead ends: 25 [2020-09-04 13:21:50,507 INFO L226 Difference]: Without dead ends: 21 [2020-09-04 13:21:50,509 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-09-04 13:21:50,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-09-04 13:21:50,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-09-04 13:21:50,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-09-04 13:21:50,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 22 transitions. [2020-09-04 13:21:50,516 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 22 transitions. Word has length 19 [2020-09-04 13:21:50,517 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:21:50,517 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 22 transitions. [2020-09-04 13:21:50,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-09-04 13:21:50,517 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 22 transitions. [2020-09-04 13:21:50,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-09-04 13:21:50,518 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:50,519 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:50,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-09-04 13:21:50,733 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:50,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:50,734 INFO L82 PathProgramCache]: Analyzing trace with hash 397359997, now seen corresponding path program 2 times [2020-09-04 13:21:50,735 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:50,735 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105747770] [2020-09-04 13:21:50,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:50,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:21:50,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,780 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:21:50,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:50,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:50,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:50,908 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-04 13:21:50,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105747770] [2020-09-04 13:21:50,911 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812775324] [2020-09-04 13:21:50,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:21:50,971 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-09-04 13:21:50,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:21:50,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 8 conjunts are in the unsatisfiable core [2020-09-04 13:21:50,978 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:21:51,065 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2020-09-04 13:21:51,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:21:51,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 9 [2020-09-04 13:21:51,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2088741182] [2020-09-04 13:21:51,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-09-04 13:21:51,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:21:51,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-09-04 13:21:51,068 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-09-04 13:21:51,068 INFO L87 Difference]: Start difference. First operand 21 states and 22 transitions. Second operand 9 states. [2020-09-04 13:21:51,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:21:51,152 INFO L93 Difference]: Finished difference Result 28 states and 29 transitions. [2020-09-04 13:21:51,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-09-04 13:21:51,153 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-09-04 13:21:51,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:21:51,155 INFO L225 Difference]: With dead ends: 28 [2020-09-04 13:21:51,155 INFO L226 Difference]: Without dead ends: 24 [2020-09-04 13:21:51,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 31 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=44, Invalid=88, Unknown=0, NotChecked=0, Total=132 [2020-09-04 13:21:51,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-09-04 13:21:51,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2020-09-04 13:21:51,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-09-04 13:21:51,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2020-09-04 13:21:51,181 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 25 [2020-09-04 13:21:51,182 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:21:51,182 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2020-09-04 13:21:51,182 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-09-04 13:21:51,182 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2020-09-04 13:21:51,183 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-09-04 13:21:51,183 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:51,186 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:51,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:21:51,387 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:51,388 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:51,389 INFO L82 PathProgramCache]: Analyzing trace with hash 1198310127, now seen corresponding path program 3 times [2020-09-04 13:21:51,389 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:51,390 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2068741977] [2020-09-04 13:21:51,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:51,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:21:51,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:21:51,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,469 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:51,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,501 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:51,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,529 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:51,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:51,559 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-09-04 13:21:51,559 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2068741977] [2020-09-04 13:21:51,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1971628692] [2020-09-04 13:21:51,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:21:51,594 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-09-04 13:21:51,595 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:21:51,596 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 10 conjunts are in the unsatisfiable core [2020-09-04 13:21:51,599 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:21:51,835 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2020-09-04 13:21:51,836 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:21:51,836 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 17 [2020-09-04 13:21:51,837 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1498994394] [2020-09-04 13:21:51,837 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-09-04 13:21:51,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:21:51,841 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-09-04 13:21:51,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-09-04 13:21:51,842 INFO L87 Difference]: Start difference. First operand 24 states and 25 transitions. Second operand 17 states. [2020-09-04 13:21:52,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:21:52,089 INFO L93 Difference]: Finished difference Result 31 states and 32 transitions. [2020-09-04 13:21:52,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-09-04 13:21:52,089 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-09-04 13:21:52,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:21:52,091 INFO L225 Difference]: With dead ends: 31 [2020-09-04 13:21:52,091 INFO L226 Difference]: Without dead ends: 27 [2020-09-04 13:21:52,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=108, Invalid=444, Unknown=0, NotChecked=0, Total=552 [2020-09-04 13:21:52,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-09-04 13:21:52,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2020-09-04 13:21:52,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-09-04 13:21:52,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 28 transitions. [2020-09-04 13:21:52,110 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 28 transitions. Word has length 31 [2020-09-04 13:21:52,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:21:52,112 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 28 transitions. [2020-09-04 13:21:52,112 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-09-04 13:21:52,112 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 28 transitions. [2020-09-04 13:21:52,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-09-04 13:21:52,114 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:52,114 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:52,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:21:52,330 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:52,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:52,330 INFO L82 PathProgramCache]: Analyzing trace with hash 1080764669, now seen corresponding path program 4 times [2020-09-04 13:21:52,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:52,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1422539735] [2020-09-04 13:21:52,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:52,346 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-09-04 13:21:52,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 5 [2020-09-04 13:21:52,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:52,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:52,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,483 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:52,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-09-04 13:21:52,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-09-04 13:21:52,535 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-04 13:21:52,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1422539735] [2020-09-04 13:21:52,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554803736] [2020-09-04 13:21:52,537 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /storage/repos/ultimate-2/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 [2020-09-04 13:21:52,573 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-09-04 13:21:52,574 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-09-04 13:21:52,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 12 conjunts are in the unsatisfiable core [2020-09-04 13:21:52,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-09-04 13:21:52,661 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2020-09-04 13:21:52,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-09-04 13:21:52,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 11 [2020-09-04 13:21:52,663 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278879554] [2020-09-04 13:21:52,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-09-04 13:21:52,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-09-04 13:21:52,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-09-04 13:21:52,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-09-04 13:21:52,665 INFO L87 Difference]: Start difference. First operand 27 states and 28 transitions. Second operand 11 states. [2020-09-04 13:21:52,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-09-04 13:21:52,763 INFO L93 Difference]: Finished difference Result 34 states and 35 transitions. [2020-09-04 13:21:52,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-09-04 13:21:52,764 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 37 [2020-09-04 13:21:52,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-09-04 13:21:52,765 INFO L225 Difference]: With dead ends: 34 [2020-09-04 13:21:52,766 INFO L226 Difference]: Without dead ends: 30 [2020-09-04 13:21:52,767 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=81, Invalid=159, Unknown=0, NotChecked=0, Total=240 [2020-09-04 13:21:52,767 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-09-04 13:21:52,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-09-04 13:21:52,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-09-04 13:21:52,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 31 transitions. [2020-09-04 13:21:52,774 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 31 transitions. Word has length 37 [2020-09-04 13:21:52,775 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-09-04 13:21:52,775 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 31 transitions. [2020-09-04 13:21:52,775 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-09-04 13:21:52,775 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 31 transitions. [2020-09-04 13:21:52,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-09-04 13:21:52,777 INFO L414 BasicCegarLoop]: Found error trace [2020-09-04 13:21:52,777 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-09-04 13:21:52,993 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-09-04 13:21:52,994 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-09-04 13:21:52,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-09-04 13:21:52,994 INFO L82 PathProgramCache]: Analyzing trace with hash -1752970513, now seen corresponding path program 5 times [2020-09-04 13:21:52,995 INFO L163 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-09-04 13:21:52,995 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328638062] [2020-09-04 13:21:52,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-09-04 13:21:53,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:21:53,013 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:21:53,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-09-04 13:21:53,035 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-09-04 13:21:53,065 INFO L174 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-09-04 13:21:53,065 INFO L520 BasicCegarLoop]: Counterexample might be feasible [2020-09-04 13:21:53,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-09-04 13:21:53,100 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 04.09 01:21:53 BoogieIcfgContainer [2020-09-04 13:21:53,100 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-09-04 13:21:53,104 INFO L168 Benchmark]: Toolchain (without parser) took 4578.08 ms. Allocated memory was 145.2 MB in the beginning and 232.3 MB in the end (delta: 87.0 MB). Free memory was 102.2 MB in the beginning and 81.0 MB in the end (delta: 21.2 MB). Peak memory consumption was 108.2 MB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,105 INFO L168 Benchmark]: CDTParser took 1.49 ms. Allocated memory is still 145.2 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,106 INFO L168 Benchmark]: CACSL2BoogieTranslator took 364.01 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,107 INFO L168 Benchmark]: Boogie Preprocessor took 33.58 ms. Allocated memory is still 145.2 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,108 INFO L168 Benchmark]: RCFGBuilder took 387.65 ms. Allocated memory was 145.2 MB in the beginning and 200.8 MB in the end (delta: 55.6 MB). Free memory was 91.3 MB in the beginning and 168.5 MB in the end (delta: -77.2 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,109 INFO L168 Benchmark]: TraceAbstraction took 3786.29 ms. Allocated memory was 200.8 MB in the beginning and 232.3 MB in the end (delta: 31.5 MB). Free memory was 167.9 MB in the beginning and 81.0 MB in the end (delta: 86.9 MB). Peak memory consumption was 118.3 MB. Max. memory is 7.1 GB. [2020-09-04 13:21:53,113 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 1.49 ms. Allocated memory is still 145.2 MB. Free memory was 119.9 MB in the beginning and 119.7 MB in the end (delta: 210.0 kB). Peak memory consumption was 210.0 kB. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 364.01 ms. Allocated memory is still 145.2 MB. Free memory was 102.0 MB in the beginning and 92.7 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.3 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 33.58 ms. Allocated memory is still 145.2 MB. Free memory was 92.7 MB in the beginning and 91.3 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.3 MB. Max. memory is 7.1 GB. * RCFGBuilder took 387.65 ms. Allocated memory was 145.2 MB in the beginning and 200.8 MB in the end (delta: 55.6 MB). Free memory was 91.3 MB in the beginning and 168.5 MB in the end (delta: -77.2 MB). Peak memory consumption was 9.9 MB. Max. memory is 7.1 GB. * TraceAbstraction took 3786.29 ms. Allocated memory was 200.8 MB in the beginning and 232.3 MB in the end (delta: 31.5 MB). Free memory was 167.9 MB in the beginning and 81.0 MB in the end (delta: 86.9 MB). Peak memory consumption was 118.3 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L10] int input = 5; VAL [input=5] [L11] CALL, EXPR id(input) VAL [\old(x)=5] [L5] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L6] CALL, EXPR id(x-1) VAL [\old(x)=4] [L5] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L6] CALL, EXPR id(x-1) VAL [\old(x)=3] [L5] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L6] CALL, EXPR id(x-1) VAL [\old(x)=2] [L5] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L6] CALL, EXPR id(x-1) VAL [\old(x)=1] [L5] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L6] CALL, EXPR id(x-1) VAL [\old(x)=0] [L5] COND TRUE x==0 [L5] return 0; VAL [\old(x)=0, \result=0, x=0] [L6] RET, EXPR id(x-1) VAL [\old(x)=1, id(x-1)=0, x=1] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=3, id(x-1)=2, x=3] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L6] return id(x-1) + 1; [L6] RET, EXPR id(x-1) VAL [\old(x)=5, id(x-1)=4, x=5] [L6] return id(x-1) + 1; [L11] RET, EXPR id(input) VAL [id(input)=5, input=5] [L11] int result = id(input); [L12] COND TRUE result == 5 VAL [input=5, result=5] [L13] __VERIFIER_error() VAL [input=5, result=5] - StatisticsResult: Ultimate Automizer benchmark data CFG has 4 procedures, 20 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.6s, OverallIterations: 6, TraceHistogramMax: 6, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 68 SDtfs, 67 SDslu, 276 SDs, 0 SdLazy, 166 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 196 GetRequests, 138 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=30occurred in iteration=5, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 1.4s InterpolantComputationTime, 280 NumberOfCodeBlocks, 275 NumberOfCodeBlocksAsserted, 14 NumberOfCheckSat, 228 ConstructedInterpolants, 0 QuantifiedInterpolants, 13800 SizeOfPredicates, 14 NumberOfNonLiveVariables, 248 ConjunctsInSsa, 36 ConjunctsInUnsatCore, 9 InterpolantComputations, 1 PerfectInterpolantSequences, 100/200 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...