/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.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/fibo_2calls_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:15:55,866 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:15:55,869 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:15:55,916 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-06 22:15:55,916 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-06 22:15:55,918 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-06 22:15:55,920 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-06 22:15:55,922 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-06 22:15:55,925 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-06 22:15:55,926 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-06 22:15:55,927 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-06 22:15:55,929 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-06 22:15:55,929 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-06 22:15:55,931 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-06 22:15:55,932 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-06 22:15:55,934 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-06 22:15:55,935 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-06 22:15:55,936 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-06 22:15:55,950 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-06 22:15:55,953 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-06 22:15:55,955 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-06 22:15:55,957 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-06 22:15:55,958 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-06 22:15:55,959 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-06 22:15:55,963 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-06 22:15:55,974 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:15:55,975 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:15:55,976 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:15:55,978 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-06 22:15:56,007 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:15:56,007 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:15:56,009 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:15:56,009 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:15:56,009 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:15:56,010 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:15:56,010 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:15:56,010 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:15:56,010 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:15:56,011 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:15:56,012 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:15:56,012 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:15:56,012 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:15:56,012 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:15:56,013 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:15:56,013 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:15:56,013 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:15:56,013 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:15:56,014 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:15:56,014 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:15:56,014 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:15:56,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:15:56,014 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:15:56,015 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:15:56,015 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:15:56,399 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:15:56,435 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:15:56,438 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:15:56,439 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:15:56,443 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:15:56,444 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-11-06 22:15:56,543 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04796414a/1a2b199ada654fbb935580b555c099db/FLAG93107b2e2 [2020-11-06 22:15:57,180 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:15:57,181 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_4-2.c [2020-11-06 22:15:57,189 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04796414a/1a2b199ada654fbb935580b555c099db/FLAG93107b2e2 [2020-11-06 22:15:57,533 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/04796414a/1a2b199ada654fbb935580b555c099db [2020-11-06 22:15:57,536 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:15:57,543 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:15:57,545 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:15:57,545 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:15:57,549 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:15:57,550 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,554 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@729061f3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57, skipping insertion in model container [2020-11-06 22:15:57,554 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,563 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:15:57,578 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:15:57,761 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:15:57,778 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:15:57,794 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:15:57,807 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:15:57,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57 WrapperNode [2020-11-06 22:15:57,808 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:15:57,809 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:15:57,809 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:15:57,809 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:15:57,823 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,823 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,831 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,832 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,838 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,840 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,841 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (1/1) ... [2020-11-06 22:15:57,843 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:15:57,844 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:15:57,845 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:15:57,845 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:15:57,846 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (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 [2020-11-06 22:15:57,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:15:57,913 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:15:57,913 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:15:57,913 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-11-06 22:15:57,914 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-11-06 22:15:57,914 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:15:57,914 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-11-06 22:15:57,914 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:15:57,914 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:15:57,914 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:15:57,915 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:15:57,916 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:15:57,916 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:15:57,916 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:15:58,212 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:15:58,213 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:15:58,231 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:15:58 BoogieIcfgContainer [2020-11-06 22:15:58,232 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:15:58,234 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:15:58,234 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:15:58,243 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:15:58,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:15:57" (1/3) ... [2020-11-06 22:15:58,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23f14eae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:15:58, skipping insertion in model container [2020-11-06 22:15:58,245 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:15:57" (2/3) ... [2020-11-06 22:15:58,245 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@23f14eae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:15:58, skipping insertion in model container [2020-11-06 22:15:58,246 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:15:58" (3/3) ... [2020-11-06 22:15:58,250 INFO L111 eAbstractionObserver]: Analyzing ICFG fibo_2calls_4-2.c [2020-11-06 22:15:58,291 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:15:58,298 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:15:58,332 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:15:58,389 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:15:58,389 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:15:58,389 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:15:58,390 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:15:58,390 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:15:58,395 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:15:58,395 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:15:58,396 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:15:58,436 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states. [2020-11-06 22:15:58,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:15:58,448 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:15:58,449 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:15:58,450 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:15:58,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:15:58,466 INFO L82 PathProgramCache]: Analyzing trace with hash 219823047, now seen corresponding path program 1 times [2020-11-06 22:15:58,483 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:15:58,484 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414378083] [2020-11-06 22:15:58,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:15:58,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:58,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:15:58,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:59,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:15:59,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:59,069 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:15:59,070 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414378083] [2020-11-06 22:15:59,071 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:15:59,072 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:15:59,072 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1086613232] [2020-11-06 22:15:59,080 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:15:59,080 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:15:59,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:15:59,097 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:15:59,099 INFO L87 Difference]: Start difference. First operand 38 states. Second operand 6 states. [2020-11-06 22:15:59,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:15:59,485 INFO L93 Difference]: Finished difference Result 53 states and 63 transitions. [2020-11-06 22:15:59,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:15:59,487 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-11-06 22:15:59,488 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:15:59,499 INFO L225 Difference]: With dead ends: 53 [2020-11-06 22:15:59,500 INFO L226 Difference]: Without dead ends: 32 [2020-11-06 22:15:59,504 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:15:59,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-11-06 22:15:59,565 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-11-06 22:15:59,567 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:15:59,569 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:15:59,571 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 15 [2020-11-06 22:15:59,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:15:59,572 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:15:59,572 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:15:59,572 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:15:59,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-11-06 22:15:59,574 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:15:59,574 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:15:59,575 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-06 22:15:59,578 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:15:59,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:15:59,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1220716726, now seen corresponding path program 1 times [2020-11-06 22:15:59,583 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:15:59,584 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [438715279] [2020-11-06 22:15:59,584 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:15:59,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:59,687 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:15:59,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:59,700 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:15:59,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:15:59,731 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:15:59,731 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [438715279] [2020-11-06 22:15:59,732 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-06 22:15:59,732 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-11-06 22:15:59,732 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1437174648] [2020-11-06 22:15:59,734 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-06 22:15:59,734 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:15:59,735 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-06 22:15:59,736 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-11-06 22:15:59,736 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 6 states. [2020-11-06 22:16:00,042 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:00,042 INFO L93 Difference]: Finished difference Result 39 states and 47 transitions. [2020-11-06 22:16:00,043 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-06 22:16:00,043 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-11-06 22:16:00,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:00,045 INFO L225 Difference]: With dead ends: 39 [2020-11-06 22:16:00,046 INFO L226 Difference]: Without dead ends: 34 [2020-11-06 22:16:00,047 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:16:00,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-11-06 22:16:00,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 32. [2020-11-06 22:16:00,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-11-06 22:16:00,058 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 39 transitions. [2020-11-06 22:16:00,059 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 39 transitions. Word has length 16 [2020-11-06 22:16:00,059 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:00,059 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 39 transitions. [2020-11-06 22:16:00,059 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-06 22:16:00,059 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 39 transitions. [2020-11-06 22:16:00,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-06 22:16:00,061 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:00,061 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:00,062 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-06 22:16:00,062 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:00,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:00,063 INFO L82 PathProgramCache]: Analyzing trace with hash 2083135015, now seen corresponding path program 1 times [2020-11-06 22:16:00,063 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:00,063 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110890538] [2020-11-06 22:16:00,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:00,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,152 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:00,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:00,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,234 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:00,237 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:16:00,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,265 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:00,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110890538] [2020-11-06 22:16:00,266 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1355810188] [2020-11-06 22:16:00,266 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 [2020-11-06 22:16:00,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:00,330 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:16:00,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:00,502 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:00,503 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:00,503 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 11 [2020-11-06 22:16:00,504 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [787051522] [2020-11-06 22:16:00,505 INFO L461 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-11-06 22:16:00,505 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:00,507 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-11-06 22:16:00,507 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=89, Unknown=0, NotChecked=0, Total=110 [2020-11-06 22:16:00,508 INFO L87 Difference]: Start difference. First operand 32 states and 39 transitions. Second operand 11 states. [2020-11-06 22:16:01,206 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:01,206 INFO L93 Difference]: Finished difference Result 61 states and 81 transitions. [2020-11-06 22:16:01,207 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-06 22:16:01,207 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 28 [2020-11-06 22:16:01,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:01,209 INFO L225 Difference]: With dead ends: 61 [2020-11-06 22:16:01,209 INFO L226 Difference]: Without dead ends: 36 [2020-11-06 22:16:01,210 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 33 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=70, Invalid=272, Unknown=0, NotChecked=0, Total=342 [2020-11-06 22:16:01,211 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-11-06 22:16:01,219 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2020-11-06 22:16:01,219 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-11-06 22:16:01,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2020-11-06 22:16:01,221 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 28 [2020-11-06 22:16:01,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:01,221 INFO L481 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2020-11-06 22:16:01,222 INFO L482 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-11-06 22:16:01,222 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2020-11-06 22:16:01,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-11-06 22:16:01,223 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:01,223 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, 1, 1, 1, 1, 1] [2020-11-06 22:16:01,436 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-06 22:16:01,437 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:01,438 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:01,438 INFO L82 PathProgramCache]: Analyzing trace with hash 752879968, now seen corresponding path program 1 times [2020-11-06 22:16:01,439 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:01,439 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [891439332] [2020-11-06 22:16:01,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:01,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,500 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:01,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:01,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,541 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:01,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,570 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:01,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,578 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:01,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [891439332] [2020-11-06 22:16:01,579 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [933477351] [2020-11-06 22:16:01,579 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 [2020-11-06 22:16:01,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:01,635 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:16:01,637 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:01,694 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-11-06 22:16:01,695 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:01,695 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 10 [2020-11-06 22:16:01,696 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [13715301] [2020-11-06 22:16:01,696 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-06 22:16:01,696 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:01,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-06 22:16:01,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=71, Unknown=0, NotChecked=0, Total=90 [2020-11-06 22:16:01,698 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand 10 states. [2020-11-06 22:16:02,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:02,410 INFO L93 Difference]: Finished difference Result 57 states and 77 transitions. [2020-11-06 22:16:02,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:16:02,411 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 29 [2020-11-06 22:16:02,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:02,419 INFO L225 Difference]: With dead ends: 57 [2020-11-06 22:16:02,419 INFO L226 Difference]: Without dead ends: 52 [2020-11-06 22:16:02,420 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2020-11-06 22:16:02,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-11-06 22:16:02,440 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 50. [2020-11-06 22:16:02,440 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-11-06 22:16:02,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 67 transitions. [2020-11-06 22:16:02,443 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 67 transitions. Word has length 29 [2020-11-06 22:16:02,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:02,443 INFO L481 AbstractCegarLoop]: Abstraction has 50 states and 67 transitions. [2020-11-06 22:16:02,443 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-06 22:16:02,443 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 67 transitions. [2020-11-06 22:16:02,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-11-06 22:16:02,445 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:02,446 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:02,658 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:02,659 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:02,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:02,660 INFO L82 PathProgramCache]: Analyzing trace with hash 2070859795, now seen corresponding path program 1 times [2020-11-06 22:16:02,661 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:02,661 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1110404732] [2020-11-06 22:16:02,662 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:02,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:02,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:02,739 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,746 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:02,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,794 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:02,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 9 [2020-11-06 22:16:02,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 22 [2020-11-06 22:16:02,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,827 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:16:02,827 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1110404732] [2020-11-06 22:16:02,828 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [871823927] [2020-11-06 22:16:02,828 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 [2020-11-06 22:16:02,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:02,893 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:02,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:03,041 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-11-06 22:16:03,042 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:03,042 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8] total 12 [2020-11-06 22:16:03,042 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462086921] [2020-11-06 22:16:03,043 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-11-06 22:16:03,043 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:03,044 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-11-06 22:16:03,044 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=108, Unknown=0, NotChecked=0, Total=132 [2020-11-06 22:16:03,044 INFO L87 Difference]: Start difference. First operand 50 states and 67 transitions. Second operand 12 states. [2020-11-06 22:16:04,120 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:04,120 INFO L93 Difference]: Finished difference Result 111 states and 173 transitions. [2020-11-06 22:16:04,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-06 22:16:04,121 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 41 [2020-11-06 22:16:04,121 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:04,123 INFO L225 Difference]: With dead ends: 111 [2020-11-06 22:16:04,124 INFO L226 Difference]: Without dead ends: 68 [2020-11-06 22:16:04,130 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 54 SyntacticMatches, 1 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=101, Invalid=405, Unknown=0, NotChecked=0, Total=506 [2020-11-06 22:16:04,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-11-06 22:16:04,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2020-11-06 22:16:04,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-11-06 22:16:04,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 97 transitions. [2020-11-06 22:16:04,170 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 97 transitions. Word has length 41 [2020-11-06 22:16:04,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:04,170 INFO L481 AbstractCegarLoop]: Abstraction has 68 states and 97 transitions. [2020-11-06 22:16:04,171 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-11-06 22:16:04,171 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 97 transitions. [2020-11-06 22:16:04,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-11-06 22:16:04,176 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:04,176 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:04,377 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:04,378 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:04,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:04,379 INFO L82 PathProgramCache]: Analyzing trace with hash 1960607334, now seen corresponding path program 1 times [2020-11-06 22:16:04,380 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:04,380 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272875309] [2020-11-06 22:16:04,381 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:04,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:04,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,458 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:04,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:04,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:04,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,527 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:04,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:04,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,552 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2020-11-06 22:16:04,552 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272875309] [2020-11-06 22:16:04,553 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596442258] [2020-11-06 22:16:04,553 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 [2020-11-06 22:16:04,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:04,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:04,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:04,758 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-11-06 22:16:04,759 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:04,759 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 14 [2020-11-06 22:16:04,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077991320] [2020-11-06 22:16:04,760 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-06 22:16:04,760 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:04,761 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-06 22:16:04,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=152, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:16:04,761 INFO L87 Difference]: Start difference. First operand 68 states and 97 transitions. Second operand 14 states. [2020-11-06 22:16:06,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:06,245 INFO L93 Difference]: Finished difference Result 183 states and 327 transitions. [2020-11-06 22:16:06,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:16:06,246 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 42 [2020-11-06 22:16:06,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:06,251 INFO L225 Difference]: With dead ends: 183 [2020-11-06 22:16:06,251 INFO L226 Difference]: Without dead ends: 122 [2020-11-06 22:16:06,254 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 95 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=136, Invalid=620, Unknown=0, NotChecked=0, Total=756 [2020-11-06 22:16:06,255 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-11-06 22:16:06,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 108. [2020-11-06 22:16:06,281 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 108 states. [2020-11-06 22:16:06,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 171 transitions. [2020-11-06 22:16:06,284 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 171 transitions. Word has length 42 [2020-11-06 22:16:06,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:06,285 INFO L481 AbstractCegarLoop]: Abstraction has 108 states and 171 transitions. [2020-11-06 22:16:06,285 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-06 22:16:06,285 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 171 transitions. [2020-11-06 22:16:06,289 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-11-06 22:16:06,290 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:06,290 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:06,504 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:06,505 INFO L429 AbstractCegarLoop]: === Iteration 7 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:06,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:06,506 INFO L82 PathProgramCache]: Analyzing trace with hash -751460799, now seen corresponding path program 1 times [2020-11-06 22:16:06,507 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:06,507 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482557687] [2020-11-06 22:16:06,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:06,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,581 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:06,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:06,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,632 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:06,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,693 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:06,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,750 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:06,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,754 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:06,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:06,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,799 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 36 [2020-11-06 22:16:06,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,810 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 15 proven. 4 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2020-11-06 22:16:06,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482557687] [2020-11-06 22:16:06,812 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317048790] [2020-11-06 22:16:06,813 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY 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 [2020-11-06 22:16:06,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:06,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-06 22:16:06,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:06,990 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 12 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-11-06 22:16:06,991 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:06,991 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 13 [2020-11-06 22:16:06,991 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [469699940] [2020-11-06 22:16:06,992 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-06 22:16:06,992 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:06,993 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-06 22:16:06,993 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=129, Unknown=0, NotChecked=0, Total=156 [2020-11-06 22:16:06,993 INFO L87 Difference]: Start difference. First operand 108 states and 171 transitions. Second operand 13 states. [2020-11-06 22:16:08,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:08,236 INFO L93 Difference]: Finished difference Result 268 states and 514 transitions. [2020-11-06 22:16:08,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-11-06 22:16:08,237 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 56 [2020-11-06 22:16:08,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:08,241 INFO L225 Difference]: With dead ends: 268 [2020-11-06 22:16:08,241 INFO L226 Difference]: Without dead ends: 167 [2020-11-06 22:16:08,243 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 99 GetRequests, 74 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=118, Invalid=532, Unknown=0, NotChecked=0, Total=650 [2020-11-06 22:16:08,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 167 states. [2020-11-06 22:16:08,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 167 to 144. [2020-11-06 22:16:08,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 144 states. [2020-11-06 22:16:08,299 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 246 transitions. [2020-11-06 22:16:08,300 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 246 transitions. Word has length 56 [2020-11-06 22:16:08,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:08,300 INFO L481 AbstractCegarLoop]: Abstraction has 144 states and 246 transitions. [2020-11-06 22:16:08,301 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-06 22:16:08,301 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 246 transitions. [2020-11-06 22:16:08,306 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-11-06 22:16:08,306 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:08,306 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:08,519 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2020-11-06 22:16:08,520 INFO L429 AbstractCegarLoop]: === Iteration 8 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:08,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:08,521 INFO L82 PathProgramCache]: Analyzing trace with hash -2073039210, now seen corresponding path program 1 times [2020-11-06 22:16:08,522 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:08,522 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106389892] [2020-11-06 22:16:08,522 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:08,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,603 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:16:08,604 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-11-06 22:16:08,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,651 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:08,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:08,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,748 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 3 [2020-11-06 22:16:08,751 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 10 [2020-11-06 22:16:08,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 23 [2020-11-06 22:16:08,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,761 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 37 [2020-11-06 22:16:08,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,783 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 19 proven. 11 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-11-06 22:16:08,783 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106389892] [2020-11-06 22:16:08,784 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [250299511] [2020-11-06 22:16:08,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:08,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:16:08,848 INFO L263 TraceCheckSpWp]: Trace formula consists of 190 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:16:08,851 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:16:08,917 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 18 proven. 5 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2020-11-06 22:16:08,918 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:16:08,918 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7] total 14 [2020-11-06 22:16:08,918 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1372282082] [2020-11-06 22:16:08,919 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-06 22:16:08,919 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:16:08,919 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-06 22:16:08,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=153, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:16:08,920 INFO L87 Difference]: Start difference. First operand 144 states and 246 transitions. Second operand 14 states. [2020-11-06 22:16:10,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:16:10,170 INFO L93 Difference]: Finished difference Result 307 states and 586 transitions. [2020-11-06 22:16:10,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-11-06 22:16:10,171 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 57 [2020-11-06 22:16:10,171 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:16:10,174 INFO L225 Difference]: With dead ends: 307 [2020-11-06 22:16:10,175 INFO L226 Difference]: Without dead ends: 103 [2020-11-06 22:16:10,178 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 96 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 98 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=133, Invalid=623, Unknown=0, NotChecked=0, Total=756 [2020-11-06 22:16:10,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-11-06 22:16:10,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 85. [2020-11-06 22:16:10,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-11-06 22:16:10,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 128 transitions. [2020-11-06 22:16:10,230 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 128 transitions. Word has length 57 [2020-11-06 22:16:10,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:16:10,230 INFO L481 AbstractCegarLoop]: Abstraction has 85 states and 128 transitions. [2020-11-06 22:16:10,230 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-06 22:16:10,231 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 128 transitions. [2020-11-06 22:16:10,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-11-06 22:16:10,236 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:16:10,236 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:16:10,452 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:16:10,453 INFO L429 AbstractCegarLoop]: === Iteration 9 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:16:10,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:16:10,454 INFO L82 PathProgramCache]: Analyzing trace with hash 1406199094, now seen corresponding path program 1 times [2020-11-06 22:16:10,455 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:16:10,455 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [351319392] [2020-11-06 22:16:10,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:16:10,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:16:10,471 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:16:10,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:16:10,485 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:16:10,512 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:16:10,512 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:16:10,512 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-11-06 22:16:10,564 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:16:10 BoogieIcfgContainer [2020-11-06 22:16:10,564 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:16:10,566 INFO L168 Benchmark]: Toolchain (without parser) took 13027.32 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 126.8 MB in the beginning and 117.7 MB in the end (delta: 9.1 MB). Peak memory consumption was 121.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:10,567 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:16:10,568 INFO L168 Benchmark]: CACSL2BoogieTranslator took 263.22 ms. Allocated memory is still 151.0 MB. Free memory was 126.2 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:10,568 INFO L168 Benchmark]: Boogie Preprocessor took 34.50 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:10,569 INFO L168 Benchmark]: RCFGBuilder took 387.35 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 134.3 MB in the end (delta: -18.9 MB). Peak memory consumption was 17.2 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:10,570 INFO L168 Benchmark]: TraceAbstraction took 12330.09 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 134.3 MB in the beginning and 117.7 MB in the end (delta: 16.6 MB). Peak memory consumption was 128.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:16:10,574 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 151.0 MB. Free memory is still 123.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 263.22 ms. Allocated memory is still 151.0 MB. Free memory was 126.2 MB in the beginning and 116.9 MB in the end (delta: 9.3 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.50 ms. Allocated memory is still 151.0 MB. Free memory was 116.9 MB in the beginning and 115.4 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 387.35 ms. Allocated memory is still 151.0 MB. Free memory was 115.4 MB in the beginning and 134.3 MB in the end (delta: -18.9 MB). Peak memory consumption was 17.2 MB. Max. memory is 8.0 GB. * TraceAbstraction took 12330.09 ms. Allocated memory was 151.0 MB in the beginning and 262.1 MB in the end (delta: 111.1 MB). Free memory was 134.3 MB in the beginning and 117.7 MB in the end (delta: 16.6 MB). Peak memory consumption was 128.0 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 4]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L38] int x = 4; VAL [x=4] [L39] CALL, EXPR fibo1(x) VAL [\old(n)=4] [L10] COND FALSE !(n < 1) VAL [\old(n)=4, n=4] [L12] COND FALSE !(n == 1) VAL [\old(n)=4, n=4] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=3] [L20] COND FALSE !(n < 1) VAL [\old(n)=3, n=3] [L22] COND FALSE !(n == 1) VAL [\old(n)=3, n=3] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=2] [L10] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L12] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L15] CALL, EXPR fibo2(n-1) VAL [\old(n)=1] [L20] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L22] COND TRUE n == 1 [L23] return 1; VAL [\old(n)=1, \result=1, n=1] [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=2, fibo2(n-1)=1, n=2] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=0] [L20] COND TRUE n < 1 [L21] return 0; VAL [\old(n)=0, \result=0, n=0] [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=2, fibo2(n-1)=1, fibo2(n-2)=0, n=2] [L15] return fibo2(n-1) + fibo2(n-2); [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=3, fibo1(n-1)=1, n=3] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=3, fibo1(n-1)=1, fibo1(n-2)=1, n=3] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-1) VAL [\old(n)=4, fibo2(n-1)=2, n=4] [L15] CALL, EXPR fibo2(n-2) VAL [\old(n)=2] [L20] COND FALSE !(n < 1) VAL [\old(n)=2, n=2] [L22] COND FALSE !(n == 1) VAL [\old(n)=2, n=2] [L25] CALL, EXPR fibo1(n-1) VAL [\old(n)=1] [L10] COND FALSE !(n < 1) VAL [\old(n)=1, n=1] [L12] COND TRUE n == 1 [L13] return 1; VAL [\old(n)=1, \result=1, n=1] [L25] RET, EXPR fibo1(n-1) VAL [\old(n)=2, fibo1(n-1)=1, n=2] [L25] CALL, EXPR fibo1(n-2) VAL [\old(n)=0] [L10] COND TRUE n < 1 [L11] return 0; VAL [\old(n)=0, \result=0, n=0] [L25] RET, EXPR fibo1(n-2) VAL [\old(n)=2, fibo1(n-1)=1, fibo1(n-2)=0, n=2] [L25] return fibo1(n-1) + fibo1(n-2); [L15] RET, EXPR fibo2(n-2) VAL [\old(n)=4, fibo2(n-1)=2, fibo2(n-2)=1, n=4] [L15] return fibo2(n-1) + fibo2(n-2); [L39] RET, EXPR fibo1(x) VAL [fibo1(x)=3, x=4] [L39] int result = fibo1(x); [L40] COND TRUE result == 3 VAL [result=3, x=4] [L41] CALL reach_error() [L4] __assert_fail("0", "fibo_2calls_4-2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 38 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 12.1s, OverallIterations: 9, TraceHistogramMax: 5, AutomataDifference: 7.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 239 SDtfs, 426 SDslu, 546 SDs, 0 SdLazy, 2348 SolverSat, 398 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 2.7s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 479 GetRequests, 333 SyntacticMatches, 3 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 4.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=144occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.2s AutomataMinimizationTime, 8 MinimizatonAttempts, 61 StatesRemovedByMinimization, 6 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 2.2s InterpolantComputationTime, 607 NumberOfCodeBlocks, 607 NumberOfCodeBlocksAsserted, 15 NumberOfCheckSat, 523 ConstructedInterpolants, 0 QuantifiedInterpolants, 46617 SizeOfPredicates, 21 NumberOfNonLiveVariables, 944 ConjunctsInSsa, 42 ConjunctsInUnsatCore, 14 InterpolantComputations, 2 PerfectInterpolantSequences, 193/262 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...