/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/id2_i5_o5-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 18:15:41,311 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 18:15:41,316 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 18:15:41,376 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-10-23 18:15:41,408 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 18:15:41,412 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 18:15:41,414 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 18:15:41,416 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 18:15:41,417 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 18:15:41,420 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 18:15:41,428 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 18:15:41,437 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 18:15:41,439 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 18:15:41,441 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 18:15:41,442 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 18:15:41,446 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 18:15:41,453 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 18:15:41,465 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 18:15:41,466 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 18:15:41,466 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 18:15:41,468 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 [2020-10-23 18:15:41,519 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 18:15:41,520 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 18:15:41,524 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-10-23 18:15:41,524 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-10-23 18:15:41,524 INFO L138 SettingsManager]: * Use SBE=true [2020-10-23 18:15:41,525 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 18:15:41,525 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 18:15:41,525 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 18:15:41,525 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 18:15:41,525 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 18:15:41,526 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 18:15:41,527 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 18:15:41,527 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 18:15:41,527 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 18:15:41,528 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 18:15:41,528 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 18:15:41,528 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 18:15:41,528 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 18:15:41,528 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-10-23 18:15:41,529 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 18:15:41,529 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 18:15:41,529 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 18:15:41,529 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 18:15:41,529 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-10-23 18:15:41,530 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-10-23 18:15:41,530 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-10-23 18:15:41,530 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-10-23 18:15:41,530 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 18:15:41,531 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-10-23 18:15:41,531 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 18:15:42,007 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 18:15:42,055 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 18:15:42,059 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 18:15:42,060 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 18:15:42,061 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 18:15:42,062 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-23 18:15:42,160 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1a4aa901/ba3e35015ba9437b888399cb1193c7d2/FLAGf2feb5eb7 [2020-10-23 18:15:42,799 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 18:15:42,800 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-1.c [2020-10-23 18:15:42,810 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1a4aa901/ba3e35015ba9437b888399cb1193c7d2/FLAGf2feb5eb7 [2020-10-23 18:15:43,161 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f1a4aa901/ba3e35015ba9437b888399cb1193c7d2 [2020-10-23 18:15:43,167 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 18:15:43,175 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 18:15:43,180 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 18:15:43,180 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 18:15:43,184 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 18:15:43,185 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,196 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@161b900c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43, skipping insertion in model container [2020-10-23 18:15:43,197 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,210 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 18:15:43,229 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 18:15:43,489 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:15:43,508 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 18:15:43,528 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 18:15:43,545 INFO L208 MainTranslator]: Completed translation [2020-10-23 18:15:43,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43 WrapperNode [2020-10-23 18:15:43,546 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 18:15:43,547 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 18:15:43,548 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 18:15:43,548 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 18:15:43,561 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,561 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,569 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,569 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,577 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,578 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (1/1) ... [2020-10-23 18:15:43,580 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 18:15:43,581 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 18:15:43,582 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 18:15:43,582 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 18:15:43,583 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (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 [2020-10-23 18:15:43,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 18:15:43,668 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 18:15:43,668 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 18:15:43,669 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-23 18:15:43,669 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-23 18:15:43,669 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 18:15:43,669 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 18:15:43,669 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 18:15:43,670 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 18:15:43,670 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 18:15:43,670 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 18:15:43,670 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-23 18:15:43,670 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-23 18:15:43,671 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 18:15:43,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 18:15:43,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 18:15:43,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 18:15:43,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 18:15:43,672 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 18:15:43,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 18:15:44,050 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 18:15:44,051 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 18:15:44,056 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:15:44 BoogieIcfgContainer [2020-10-23 18:15:44,056 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 18:15:44,062 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 18:15:44,062 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 18:15:44,073 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 18:15:44,074 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 06:15:43" (1/3) ... [2020-10-23 18:15:44,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b9dbed4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:15:44, skipping insertion in model container [2020-10-23 18:15:44,075 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 06:15:43" (2/3) ... [2020-10-23 18:15:44,075 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b9dbed4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 06:15:44, skipping insertion in model container [2020-10-23 18:15:44,076 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 06:15:44" (3/3) ... [2020-10-23 18:15:44,077 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-1.c [2020-10-23 18:15:44,090 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-10-23 18:15:44,095 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 18:15:44,110 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 18:15:44,139 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 18:15:44,139 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 18:15:44,139 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-10-23 18:15:44,140 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 18:15:44,140 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 18:15:44,140 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 18:15:44,140 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 18:15:44,140 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 18:15:44,159 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states. [2020-10-23 18:15:44,165 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-10-23 18:15:44,165 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:44,166 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:44,167 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:44,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:44,174 INFO L82 PathProgramCache]: Analyzing trace with hash 1481297807, now seen corresponding path program 1 times [2020-10-23 18:15:44,184 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:44,185 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845834288] [2020-10-23 18:15:44,185 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:44,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:44,511 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:44,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:44,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:44,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:44,563 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:15:44,564 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1845834288] [2020-10-23 18:15:44,565 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:44,566 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 18:15:44,567 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661142379] [2020-10-23 18:15:44,572 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 18:15:44,573 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:44,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 18:15:44,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 18:15:44,594 INFO L87 Difference]: Start difference. First operand 31 states. Second operand 6 states. [2020-10-23 18:15:44,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:44,872 INFO L93 Difference]: Finished difference Result 44 states and 49 transitions. [2020-10-23 18:15:44,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 18:15:44,875 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 15 [2020-10-23 18:15:44,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:44,886 INFO L225 Difference]: With dead ends: 44 [2020-10-23 18:15:44,886 INFO L226 Difference]: Without dead ends: 26 [2020-10-23 18:15:44,890 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 [2020-10-23 18:15:44,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-10-23 18:15:44,940 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-10-23 18:15:44,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-10-23 18:15:44,944 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-10-23 18:15:44,945 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 15 [2020-10-23 18:15:44,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:44,946 INFO L481 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-10-23 18:15:44,946 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 18:15:44,946 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-10-23 18:15:44,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-10-23 18:15:44,948 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:44,949 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:44,949 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 18:15:44,949 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:44,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:44,951 INFO L82 PathProgramCache]: Analyzing trace with hash 262491562, now seen corresponding path program 1 times [2020-10-23 18:15:44,951 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:44,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1538286916] [2020-10-23 18:15:44,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:44,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,140 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:45,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,167 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:45,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:45,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,295 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-10-23 18:15:45,295 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1538286916] [2020-10-23 18:15:45,296 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 18:15:45,300 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 18:15:45,301 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112464554] [2020-10-23 18:15:45,305 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 18:15:45,305 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:45,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 18:15:45,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-23 18:15:45,310 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 8 states. [2020-10-23 18:15:45,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:45,671 INFO L93 Difference]: Finished difference Result 36 states and 38 transitions. [2020-10-23 18:15:45,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 18:15:45,672 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-10-23 18:15:45,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:45,674 INFO L225 Difference]: With dead ends: 36 [2020-10-23 18:15:45,674 INFO L226 Difference]: Without dead ends: 31 [2020-10-23 18:15:45,676 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:15:45,676 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-10-23 18:15:45,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2020-10-23 18:15:45,686 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-10-23 18:15:45,687 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2020-10-23 18:15:45,687 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 21 [2020-10-23 18:15:45,688 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:45,688 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2020-10-23 18:15:45,688 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 18:15:45,688 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2020-10-23 18:15:45,689 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-10-23 18:15:45,689 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:45,690 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] [2020-10-23 18:15:45,690 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 18:15:45,690 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:45,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:45,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1067256061, now seen corresponding path program 1 times [2020-10-23 18:15:45,691 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:45,692 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584699783] [2020-10-23 18:15:45,692 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:45,713 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,769 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:45,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:45,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:45,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:45,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,872 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:15:45,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584699783] [2020-10-23 18:15:45,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2063582536] [2020-10-23 18:15:45,873 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 [2020-10-23 18:15:45,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:45,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 126 conjuncts, 8 conjunts are in the unsatisfiable core [2020-10-23 18:15:45,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:15:46,074 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2020-10-23 18:15:46,075 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:15:46,075 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8] total 12 [2020-10-23 18:15:46,075 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762852329] [2020-10-23 18:15:46,076 INFO L461 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-10-23 18:15:46,076 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:46,077 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-10-23 18:15:46,077 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2020-10-23 18:15:46,077 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand 12 states. [2020-10-23 18:15:46,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:46,448 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2020-10-23 18:15:46,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-10-23 18:15:46,449 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 27 [2020-10-23 18:15:46,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:46,450 INFO L225 Difference]: With dead ends: 42 [2020-10-23 18:15:46,451 INFO L226 Difference]: Without dead ends: 37 [2020-10-23 18:15:46,452 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2020-10-23 18:15:46,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-10-23 18:15:46,459 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 32. [2020-10-23 18:15:46,460 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-10-23 18:15:46,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-10-23 18:15:46,461 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 27 [2020-10-23 18:15:46,462 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:46,462 INFO L481 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-10-23 18:15:46,462 INFO L482 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-10-23 18:15:46,462 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-10-23 18:15:46,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 18:15:46,463 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:46,463 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:46,677 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-10-23 18:15:46,679 INFO L429 AbstractCegarLoop]: === Iteration 4 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:46,680 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:46,680 INFO L82 PathProgramCache]: Analyzing trace with hash -1416908450, now seen corresponding path program 1 times [2020-10-23 18:15:46,680 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:46,681 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [817880069] [2020-10-23 18:15:46,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:46,699 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,741 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:46,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:46,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,782 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:46,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,816 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:46,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,838 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:46,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,861 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-23 18:15:46,861 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [817880069] [2020-10-23 18:15:46,862 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1022262384] [2020-10-23 18:15:46,862 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 [2020-10-23 18:15:46,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:46,915 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 10 conjunts are in the unsatisfiable core [2020-10-23 18:15:46,918 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:15:47,008 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-10-23 18:15:47,009 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:15:47,009 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 9] total 13 [2020-10-23 18:15:47,009 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [629385084] [2020-10-23 18:15:47,010 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-10-23 18:15:47,010 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:47,011 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-10-23 18:15:47,011 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=127, Unknown=0, NotChecked=0, Total=156 [2020-10-23 18:15:47,012 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 13 states. [2020-10-23 18:15:47,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:47,463 INFO L93 Difference]: Finished difference Result 48 states and 50 transitions. [2020-10-23 18:15:47,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-10-23 18:15:47,465 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-10-23 18:15:47,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:47,470 INFO L225 Difference]: With dead ends: 48 [2020-10-23 18:15:47,471 INFO L226 Difference]: Without dead ends: 43 [2020-10-23 18:15:47,472 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=76, Invalid=304, Unknown=0, NotChecked=0, Total=380 [2020-10-23 18:15:47,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-10-23 18:15:47,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 35. [2020-10-23 18:15:47,484 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-10-23 18:15:47,485 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2020-10-23 18:15:47,485 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 33 [2020-10-23 18:15:47,486 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:47,486 INFO L481 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2020-10-23 18:15:47,486 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-10-23 18:15:47,486 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2020-10-23 18:15:47,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-10-23 18:15:47,488 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:47,488 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:47,702 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:15:47,703 INFO L429 AbstractCegarLoop]: === Iteration 5 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:47,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:47,705 INFO L82 PathProgramCache]: Analyzing trace with hash 1482575991, now seen corresponding path program 2 times [2020-10-23 18:15:47,705 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:47,706 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1291629861] [2020-10-23 18:15:47,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:47,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 18:15:47,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,775 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-10-23 18:15:47,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:47,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,848 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:47,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:47,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 18:15:47,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 18:15:47,924 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-23 18:15:47,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1291629861] [2020-10-23 18:15:47,925 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2012722604] [2020-10-23 18:15:47,925 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 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 [2020-10-23 18:15:47,986 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-10-23 18:15:47,986 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-10-23 18:15:47,987 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 12 conjunts are in the unsatisfiable core [2020-10-23 18:15:47,990 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-10-23 18:15:48,117 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-10-23 18:15:48,118 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-10-23 18:15:48,118 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 14 [2020-10-23 18:15:48,119 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1619858415] [2020-10-23 18:15:48,119 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-10-23 18:15:48,119 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-10-23 18:15:48,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-10-23 18:15:48,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=148, Unknown=0, NotChecked=0, Total=182 [2020-10-23 18:15:48,121 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand 14 states. [2020-10-23 18:15:48,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 18:15:48,721 INFO L93 Difference]: Finished difference Result 54 states and 56 transitions. [2020-10-23 18:15:48,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-10-23 18:15:48,722 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 39 [2020-10-23 18:15:48,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 18:15:48,725 INFO L225 Difference]: With dead ends: 54 [2020-10-23 18:15:48,725 INFO L226 Difference]: Without dead ends: 49 [2020-10-23 18:15:48,726 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=92, Invalid=370, Unknown=0, NotChecked=0, Total=462 [2020-10-23 18:15:48,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-10-23 18:15:48,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 38. [2020-10-23 18:15:48,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-10-23 18:15:48,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-10-23 18:15:48,735 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 39 [2020-10-23 18:15:48,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 18:15:48,736 INFO L481 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-10-23 18:15:48,736 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-10-23 18:15:48,736 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-10-23 18:15:48,737 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-10-23 18:15:48,737 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 18:15:48,737 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 18:15:48,949 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-10-23 18:15:48,950 INFO L429 AbstractCegarLoop]: === Iteration 6 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 18:15:48,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 18:15:48,951 INFO L82 PathProgramCache]: Analyzing trace with hash -487565550, now seen corresponding path program 2 times [2020-10-23 18:15:48,952 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-10-23 18:15:48,952 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944763182] [2020-10-23 18:15:48,952 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 18:15:48,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:15:48,975 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:15:49,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 18:15:49,024 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 18:15:49,059 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-10-23 18:15:49,060 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 18:15:49,060 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-10-23 18:15:49,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 06:15:49 BoogieIcfgContainer [2020-10-23 18:15:49,156 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 18:15:49,160 INFO L168 Benchmark]: Toolchain (without parser) took 5988.26 ms. Allocated memory was 174.1 MB in the beginning and 209.7 MB in the end (delta: 35.7 MB). Free memory was 150.1 MB in the beginning and 151.9 MB in the end (delta: -1.8 MB). Peak memory consumption was 35.1 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:49,160 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 125.8 MB. Free memory is still 96.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 18:15:49,162 INFO L168 Benchmark]: CACSL2BoogieTranslator took 366.80 ms. Allocated memory is still 174.1 MB. Free memory was 149.4 MB in the beginning and 140.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:49,164 INFO L168 Benchmark]: Boogie Preprocessor took 33.16 ms. Allocated memory is still 174.1 MB. Free memory was 140.2 MB in the beginning and 138.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:49,165 INFO L168 Benchmark]: RCFGBuilder took 474.96 ms. Allocated memory is still 174.1 MB. Free memory was 138.9 MB in the beginning and 125.7 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:49,166 INFO L168 Benchmark]: TraceAbstraction took 5094.87 ms. Allocated memory was 174.1 MB in the beginning and 209.7 MB in the end (delta: 35.7 MB). Free memory was 125.3 MB in the beginning and 151.9 MB in the end (delta: -26.6 MB). Peak memory consumption was 10.0 MB. Max. memory is 8.0 GB. [2020-10-23 18:15:49,173 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 125.8 MB. Free memory is still 96.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 366.80 ms. Allocated memory is still 174.1 MB. Free memory was 149.4 MB in the beginning and 140.4 MB in the end (delta: 9.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.16 ms. Allocated memory is still 174.1 MB. Free memory was 140.2 MB in the beginning and 138.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 474.96 ms. Allocated memory is still 174.1 MB. Free memory was 138.9 MB in the beginning and 125.7 MB in the end (delta: 13.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 5094.87 ms. Allocated memory was 174.1 MB in the beginning and 209.7 MB in the end (delta: 35.7 MB). Free memory was 125.3 MB in the beginning and 151.9 MB in the end (delta: -26.6 MB). Peak memory consumption was 10.0 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: [L20] int input = 5; VAL [input=5] [L21] CALL, EXPR id(input) VAL [\old(x)=5] [L10] COND FALSE !(x==0) VAL [\old(x)=5, x=5] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=4] [L15] COND FALSE !(x==0) VAL [\old(x)=4, x=4] [L16] CALL, EXPR id(x-1) VAL [\old(x)=3] [L10] COND FALSE !(x==0) VAL [\old(x)=3, x=3] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=2] [L15] COND FALSE !(x==0) VAL [\old(x)=2, x=2] [L16] CALL, EXPR id(x-1) VAL [\old(x)=1] [L10] COND FALSE !(x==0) VAL [\old(x)=1, x=1] [L11] CALL, EXPR id2(x-1) VAL [\old(x)=0] [L15] COND TRUE x==0 [L15] return 0; VAL [\old(x)=0, \result=0, x=0] [L11] RET, EXPR id2(x-1) VAL [\old(x)=1, id2(x-1)=0, x=1] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=2, id(x-1)=1, x=2] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=3, id2(x-1)=2, x=3] [L11] return id2(x-1) + 1; [L16] RET, EXPR id(x-1) VAL [\old(x)=4, id(x-1)=3, x=4] [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) VAL [\old(x)=5, id2(x-1)=4, x=5] [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) VAL [id(input)=5, input=5] [L21] int result = id(input); [L22] COND TRUE result == 5 VAL [input=5, result=5] [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-1.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 31 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 4.9s, OverallIterations: 6, TraceHistogramMax: 3, AutomataDifference: 2.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 96 SDtfs, 171 SDslu, 229 SDs, 0 SdLazy, 555 SolverSat, 92 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.6s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 196 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 1.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=38occurred 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, 26 StatesRemovedByMinimization, 4 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 1.3s InterpolantComputationTime, 279 NumberOfCodeBlocks, 279 NumberOfCodeBlocksAsserted, 10 NumberOfCheckSat, 226 ConstructedInterpolants, 0 QuantifiedInterpolants, 18792 SizeOfPredicates, 15 NumberOfNonLiveVariables, 420 ConjunctsInSsa, 30 ConjunctsInUnsatCore, 8 InterpolantComputations, 2 PerfectInterpolantSequences, 34/68 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...