/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/afterrec-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-06 22:02:47,290 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-06 22:02:47,294 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-06 22:02:47,351 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2020-11-06 22:02:47,425 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-06 22:02:47,426 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-06 22:02:47,427 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-06 22:02:47,428 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 22:02:47,469 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-06 22:02:47,470 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-06 22:02:47,474 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-06 22:02:47,474 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-06 22:02:47,474 INFO L138 SettingsManager]: * Use SBE=true [2020-11-06 22:02:47,475 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-06 22:02:47,475 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-06 22:02:47,475 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-06 22:02:47,475 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-06 22:02:47,475 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-06 22:02:47,476 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-06 22:02:47,477 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-06 22:02:47,477 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-06 22:02:47,477 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-06 22:02:47,477 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-06 22:02:47,477 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-06 22:02:47,478 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-06 22:02:47,478 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-06 22:02:47,478 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-06 22:02:47,478 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-06 22:02:47,478 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-06 22:02:47,479 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-06 22:02:47,479 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-06 22:02:47,479 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-06 22:02:47,479 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-06 22:02:47,479 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-06 22:02:47,480 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-06 22:02:47,480 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-06 22:02:47,480 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-06 22:02:47,481 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-11-06 22:02:47,862 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-06 22:02:47,897 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-06 22:02:47,905 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-06 22:02:47,907 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-06 22:02:47,907 INFO L275 PluginConnector]: CDTParser initialized [2020-11-06 22:02:47,909 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-11-06 22:02:47,993 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f80dfb245/97863a4851994a40b2f78209f3bcf063/FLAGda7ec27ae [2020-11-06 22:02:48,567 INFO L306 CDTParser]: Found 1 translation units. [2020-11-06 22:02:48,568 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec-1.c [2020-11-06 22:02:48,575 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f80dfb245/97863a4851994a40b2f78209f3bcf063/FLAGda7ec27ae [2020-11-06 22:02:48,939 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/f80dfb245/97863a4851994a40b2f78209f3bcf063 [2020-11-06 22:02:48,944 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-06 22:02:48,951 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-06 22:02:48,953 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-06 22:02:48,953 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-06 22:02:48,957 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-06 22:02:48,958 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:02:48" (1/1) ... [2020-11-06 22:02:48,962 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@23bfff77 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:48, skipping insertion in model container [2020-11-06 22:02:48,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 10:02:48" (1/1) ... [2020-11-06 22:02:48,971 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-06 22:02:48,985 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-06 22:02:49,143 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:02:49,155 INFO L203 MainTranslator]: Completed pre-run [2020-11-06 22:02:49,170 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-06 22:02:49,187 INFO L208 MainTranslator]: Completed translation [2020-11-06 22:02:49,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49 WrapperNode [2020-11-06 22:02:49,188 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-06 22:02:49,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-06 22:02:49,190 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-06 22:02:49,190 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-06 22:02:49,204 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,204 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,212 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,212 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,218 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,220 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,221 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (1/1) ... [2020-11-06 22:02:49,223 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-06 22:02:49,224 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-06 22:02:49,224 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-06 22:02:49,224 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-06 22:02:49,225 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (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 22:02:49,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-06 22:02:49,314 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-06 22:02:49,315 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-06 22:02:49,315 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-11-06 22:02:49,315 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-06 22:02:49,316 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-06 22:02:49,316 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-06 22:02:49,316 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-06 22:02:49,316 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-06 22:02:49,317 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-11-06 22:02:49,317 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-06 22:02:49,317 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-06 22:02:49,317 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-06 22:02:49,318 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-06 22:02:49,319 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-06 22:02:49,320 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-06 22:02:49,320 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-06 22:02:49,632 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-06 22:02:49,632 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-06 22:02:49,634 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:02:49 BoogieIcfgContainer [2020-11-06 22:02:49,634 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-06 22:02:49,636 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-06 22:02:49,636 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-06 22:02:49,640 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-06 22:02:49,640 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 10:02:48" (1/3) ... [2020-11-06 22:02:49,641 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32b99a0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:02:49, skipping insertion in model container [2020-11-06 22:02:49,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 10:02:49" (2/3) ... [2020-11-06 22:02:49,642 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@32b99a0c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 10:02:49, skipping insertion in model container [2020-11-06 22:02:49,642 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 10:02:49" (3/3) ... [2020-11-06 22:02:49,644 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec-1.c [2020-11-06 22:02:49,661 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-06 22:02:49,665 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-06 22:02:49,679 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-06 22:02:49,729 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-06 22:02:49,729 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-06 22:02:49,729 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-06 22:02:49,739 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-06 22:02:49,740 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-06 22:02:49,740 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-06 22:02:49,740 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-06 22:02:49,740 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-06 22:02:49,812 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-11-06 22:02:49,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-06 22:02:49,818 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:02:49,819 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:02:49,819 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:02:49,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:02:49,827 INFO L82 PathProgramCache]: Analyzing trace with hash -56492575, now seen corresponding path program 1 times [2020-11-06 22:02:49,838 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:02:49,838 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [399550884] [2020-11-06 22:02:49,839 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:02:50,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:50,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:02:50,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:50,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2020-11-06 22:02:50,363 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:50,423 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:02:50,424 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [399550884] [2020-11-06 22:02:50,425 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [226068655] [2020-11-06 22:02:50,426 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 22:02:50,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:50,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-06 22:02:50,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:02:50,612 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:02:50,613 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-06 22:02:50,613 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7] total 9 [2020-11-06 22:02:50,615 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528928149] [2020-11-06 22:02:50,620 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-06 22:02:50,621 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:02:50,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-06 22:02:50,637 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=55, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:02:50,639 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 9 states. [2020-11-06 22:02:51,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:02:51,046 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-11-06 22:02:51,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-06 22:02:51,048 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2020-11-06 22:02:51,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:02:51,056 INFO L225 Difference]: With dead ends: 29 [2020-11-06 22:02:51,056 INFO L226 Difference]: Without dead ends: 17 [2020-11-06 22:02:51,060 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 16 SyntacticMatches, 1 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=132, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:02:51,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-11-06 22:02:51,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-11-06 22:02:51,098 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-11-06 22:02:51,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-11-06 22:02:51,106 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 15 [2020-11-06 22:02:51,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:02:51,106 INFO L481 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-11-06 22:02:51,106 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-06 22:02:51,107 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-11-06 22:02:51,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-11-06 22:02:51,108 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:02:51,108 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:02:51,321 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2020-11-06 22:02:51,322 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:02:51,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:02:51,324 INFO L82 PathProgramCache]: Analyzing trace with hash 900577825, now seen corresponding path program 2 times [2020-11-06 22:02:51,324 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:02:51,325 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [390037703] [2020-11-06 22:02:51,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:02:51,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:51,525 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-06 22:02:51,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:51,549 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 14 [2020-11-06 22:02:51,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-06 22:02:51,564 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:02:51,565 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [390037703] [2020-11-06 22:02:51,565 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [374042371] [2020-11-06 22:02:51,565 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 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 22:02:51,654 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-06 22:02:51,655 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-06 22:02:51,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 9 conjunts are in the unsatisfiable core [2020-11-06 22:02:51,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-06 22:02:51,745 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 15 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-06 22:02:51,745 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 1 imperfect interpolant sequences. [2020-11-06 22:02:51,745 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 9 [2020-11-06 22:02:51,746 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1315207113] [2020-11-06 22:02:51,747 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-06 22:02:51,747 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-06 22:02:51,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-06 22:02:51,748 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-11-06 22:02:51,748 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 8 states. [2020-11-06 22:02:51,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-06 22:02:51,849 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-11-06 22:02:51,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-11-06 22:02:51,850 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 21 [2020-11-06 22:02:51,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-06 22:02:51,851 INFO L225 Difference]: With dead ends: 29 [2020-11-06 22:02:51,852 INFO L226 Difference]: Without dead ends: 19 [2020-11-06 22:02:51,853 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-11-06 22:02:51,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-06 22:02:51,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-11-06 22:02:51,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-06 22:02:51,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 18 transitions. [2020-11-06 22:02:51,860 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 18 transitions. Word has length 21 [2020-11-06 22:02:51,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-06 22:02:51,861 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 18 transitions. [2020-11-06 22:02:51,861 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-06 22:02:51,861 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 18 transitions. [2020-11-06 22:02:51,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-06 22:02:51,862 INFO L414 BasicCegarLoop]: Found error trace [2020-11-06 22:02:51,862 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-06 22:02:52,075 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-06 22:02:52,076 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-06 22:02:52,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-06 22:02:52,078 INFO L82 PathProgramCache]: Analyzing trace with hash -1335781737, now seen corresponding path program 3 times [2020-11-06 22:02:52,078 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-06 22:02:52,079 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269558229] [2020-11-06 22:02:52,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-06 22:02:52,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:02:52,097 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:02:52,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-06 22:02:52,112 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-06 22:02:52,133 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-06 22:02:52,133 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-06 22:02:52,134 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-06 22:02:52,162 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 06.11 10:02:52 BoogieIcfgContainer [2020-11-06 22:02:52,162 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-06 22:02:52,165 INFO L168 Benchmark]: Toolchain (without parser) took 3217.49 ms. Allocated memory is still 156.2 MB. Free memory was 131.5 MB in the beginning and 119.1 MB in the end (delta: 12.4 MB). Peak memory consumption was 13.7 MB. Max. memory is 8.0 GB. [2020-11-06 22:02:52,165 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 125.8 MB. Free memory is still 101.0 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:02:52,167 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.86 ms. Allocated memory is still 156.2 MB. Free memory was 131.0 MB in the beginning and 122.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-11-06 22:02:52,168 INFO L168 Benchmark]: Boogie Preprocessor took 33.78 ms. Allocated memory is still 156.2 MB. Free memory was 122.1 MB in the beginning and 120.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-06 22:02:52,169 INFO L168 Benchmark]: RCFGBuilder took 410.10 ms. Allocated memory is still 156.2 MB. Free memory was 120.8 MB in the beginning and 109.6 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. [2020-11-06 22:02:52,169 INFO L168 Benchmark]: TraceAbstraction took 2526.21 ms. Allocated memory is still 156.2 MB. Free memory was 109.2 MB in the beginning and 119.1 MB in the end (delta: -9.9 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-06 22:02:52,173 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 125.8 MB. Free memory is still 101.0 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 235.86 ms. Allocated memory is still 156.2 MB. Free memory was 131.0 MB in the beginning and 122.1 MB in the end (delta: 8.9 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 33.78 ms. Allocated memory is still 156.2 MB. Free memory was 122.1 MB in the beginning and 120.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 410.10 ms. Allocated memory is still 156.2 MB. Free memory was 120.8 MB in the beginning and 109.6 MB in the end (delta: 11.1 MB). Peak memory consumption was 11.5 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2526.21 ms. Allocated memory is still 156.2 MB. Free memory was 109.2 MB in the beginning and 119.1 MB in the end (delta: -9.9 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L13] CALL f(4) VAL [\old(n)=4] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=4, n=3] [L8] CALL f(n) VAL [\old(n)=3] [L6] COND FALSE !(n<3) [L7] n-- VAL [\old(n)=3, n=2] [L8] CALL f(n) VAL [\old(n)=2] [L6] COND TRUE n<3 VAL [\old(n)=2, n=2] [L8] RET f(n) VAL [\old(n)=3, n=2] [L9] CALL reach_error() [L3] __assert_fail("0", "afterrec-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 21 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.4s, OverallIterations: 3, TraceHistogramMax: 4, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 21 SDtfs, 22 SDslu, 50 SDs, 0 SdLazy, 70 SolverSat, 20 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 68 GetRequests, 43 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=21occurred in iteration=0, 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, 2 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 90 NumberOfCodeBlocks, 90 NumberOfCodeBlocksAsserted, 6 NumberOfCheckSat, 68 ConstructedInterpolants, 0 QuantifiedInterpolants, 3188 SizeOfPredicates, 6 NumberOfNonLiveVariables, 208 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 4 InterpolantComputations, 1 PerfectInterpolantSequences, 24/34 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...