/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/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-b8ad66e [2020-10-23 20:27:01,351 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-10-23 20:27:01,354 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-10-23 20:27:01,390 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-10-23 20:27:01,391 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-10-23 20:27:01,392 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-10-23 20:27:01,394 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-10-23 20:27:01,397 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-10-23 20:27:01,399 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-10-23 20:27:01,400 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-10-23 20:27:01,402 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-10-23 20:27:01,403 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-10-23 20:27:01,404 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-10-23 20:27:01,405 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-10-23 20:27:01,407 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-10-23 20:27:01,408 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-10-23 20:27:01,419 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-10-23 20:27:01,420 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-10-23 20:27:01,422 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-10-23 20:27:01,425 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-10-23 20:27:01,427 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-10-23 20:27:01,429 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-10-23 20:27:01,430 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-10-23 20:27:01,432 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-10-23 20:27:01,435 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-10-23 20:27:01,446 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-10-23 20:27:01,447 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-10-23 20:27:01,448 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-10-23 20:27:01,449 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-10-23 20:27:01,461 INFO L113 SettingsManager]: Loading preferences was successful [2020-10-23 20:27:01,462 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-10-23 20:27:01,463 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-10-23 20:27:01,464 INFO L138 SettingsManager]: * sizeof long=4 [2020-10-23 20:27:01,464 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-10-23 20:27:01,464 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-10-23 20:27:01,464 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-10-23 20:27:01,465 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-10-23 20:27:01,465 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-10-23 20:27:01,465 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-10-23 20:27:01,465 INFO L138 SettingsManager]: * sizeof long double=12 [2020-10-23 20:27:01,465 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-10-23 20:27:01,466 INFO L138 SettingsManager]: * Use constant arrays=true [2020-10-23 20:27:01,466 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-10-23 20:27:01,466 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-10-23 20:27:01,466 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-10-23 20:27:01,466 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-10-23 20:27:01,467 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-10-23 20:27:01,467 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-10-23 20:27:01,467 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-10-23 20:27:01,467 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-10-23 20:27:01,467 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-10-23 20:27:01,468 INFO L138 SettingsManager]: * Use separate solver for trace checks=false 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2020-10-23 20:27:01,852 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-10-23 20:27:01,903 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-10-23 20:27:01,907 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-10-23 20:27:01,908 INFO L271 PluginConnector]: Initializing CDTParser... [2020-10-23 20:27:01,909 INFO L275 PluginConnector]: CDTParser initialized [2020-10-23 20:27:01,910 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-10-23 20:27:01,997 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ebc2aba6/69c6bb1b1b72404cac8ccd819382f8f9/FLAG4b3fd67ee [2020-10-23 20:27:02,700 INFO L306 CDTParser]: Found 1 translation units. [2020-10-23 20:27:02,701 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id2_i5_o5-2.c [2020-10-23 20:27:02,709 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ebc2aba6/69c6bb1b1b72404cac8ccd819382f8f9/FLAG4b3fd67ee [2020-10-23 20:27:03,047 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8ebc2aba6/69c6bb1b1b72404cac8ccd819382f8f9 [2020-10-23 20:27:03,051 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-10-23 20:27:03,063 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-10-23 20:27:03,067 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-10-23 20:27:03,067 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-10-23 20:27:03,071 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-10-23 20:27:03,072 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,076 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@593054a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03, skipping insertion in model container [2020-10-23 20:27:03,077 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,085 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-10-23 20:27:03,109 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-10-23 20:27:03,266 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:27:03,278 INFO L203 MainTranslator]: Completed pre-run [2020-10-23 20:27:03,296 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-10-23 20:27:03,311 INFO L208 MainTranslator]: Completed translation [2020-10-23 20:27:03,312 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03 WrapperNode [2020-10-23 20:27:03,312 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-10-23 20:27:03,313 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-10-23 20:27:03,313 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-10-23 20:27:03,313 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-10-23 20:27:03,328 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,328 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,336 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,337 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,342 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,344 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,345 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (1/1) ... [2020-10-23 20:27:03,348 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-10-23 20:27:03,350 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-10-23 20:27:03,350 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-10-23 20:27:03,350 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-10-23 20:27:03,351 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (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 20:27:03,439 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-10-23 20:27:03,440 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-10-23 20:27:03,441 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-10-23 20:27:03,442 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2020-10-23 20:27:03,442 INFO L138 BoogieDeclarations]: Found implementation of procedure id2 [2020-10-23 20:27:03,442 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-10-23 20:27:03,443 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-10-23 20:27:03,443 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-10-23 20:27:03,443 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-10-23 20:27:03,443 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-10-23 20:27:03,444 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-10-23 20:27:03,444 INFO L130 BoogieDeclarations]: Found specification of procedure id [2020-10-23 20:27:03,444 INFO L130 BoogieDeclarations]: Found specification of procedure id2 [2020-10-23 20:27:03,445 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-10-23 20:27:03,445 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-10-23 20:27:03,445 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-10-23 20:27:03,445 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-10-23 20:27:03,446 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-10-23 20:27:03,446 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-10-23 20:27:03,446 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-10-23 20:27:03,815 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-10-23 20:27:03,815 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-10-23 20:27:03,817 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:27:03 BoogieIcfgContainer [2020-10-23 20:27:03,817 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-10-23 20:27:03,827 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-10-23 20:27:03,828 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-10-23 20:27:03,835 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-10-23 20:27:03,835 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.10 08:27:03" (1/3) ... [2020-10-23 20:27:03,836 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57ceb285 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:27:03, skipping insertion in model container [2020-10-23 20:27:03,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.10 08:27:03" (2/3) ... [2020-10-23 20:27:03,836 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@57ceb285 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.10 08:27:03, skipping insertion in model container [2020-10-23 20:27:03,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.10 08:27:03" (3/3) ... [2020-10-23 20:27:03,841 INFO L111 eAbstractionObserver]: Analyzing ICFG id2_i5_o5-2.c [2020-10-23 20:27:03,855 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-10-23 20:27:03,860 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-10-23 20:27:03,877 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-10-23 20:27:03,906 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-10-23 20:27:03,906 INFO L378 AbstractCegarLoop]: Hoare is true [2020-10-23 20:27:03,906 INFO L379 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2020-10-23 20:27:03,906 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-10-23 20:27:03,907 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-10-23 20:27:03,907 INFO L382 AbstractCegarLoop]: Difference is false [2020-10-23 20:27:03,907 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-10-23 20:27:03,907 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-10-23 20:27:03,927 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states. [2020-10-23 20:27:03,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-10-23 20:27:03,938 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:03,939 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, 1, 1, 1, 1] [2020-10-23 20:27:03,940 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:03,947 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:03,948 INFO L82 PathProgramCache]: Analyzing trace with hash -407315157, now seen corresponding path program 1 times [2020-10-23 20:27:03,959 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:03,959 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132218532] [2020-10-23 20:27:03,960 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:04,085 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:27:04,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:27:04,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-23 20:27:04,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:04,543 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 20:27:04,545 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132218532] [2020-10-23 20:27:04,547 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:27:04,548 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-10-23 20:27:04,548 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [734048220] [2020-10-23 20:27:04,554 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-10-23 20:27:04,555 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:27:04,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-10-23 20:27:04,572 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-10-23 20:27:04,574 INFO L87 Difference]: Start difference. First operand 46 states. Second operand 6 states. [2020-10-23 20:27:04,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:27:04,888 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2020-10-23 20:27:04,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-10-23 20:27:04,890 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 25 [2020-10-23 20:27:04,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:27:04,902 INFO L225 Difference]: With dead ends: 59 [2020-10-23 20:27:04,902 INFO L226 Difference]: Without dead ends: 41 [2020-10-23 20:27:04,906 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2020-10-23 20:27:04,927 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-10-23 20:27:04,967 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-10-23 20:27:04,968 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-10-23 20:27:04,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 43 transitions. [2020-10-23 20:27:04,972 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 43 transitions. Word has length 25 [2020-10-23 20:27:04,973 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:27:04,973 INFO L481 AbstractCegarLoop]: Abstraction has 41 states and 43 transitions. [2020-10-23 20:27:04,973 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-10-23 20:27:04,973 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 43 transitions. [2020-10-23 20:27:04,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-10-23 20:27:04,976 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:04,976 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:27:04,977 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-10-23 20:27:04,977 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:04,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:04,979 INFO L82 PathProgramCache]: Analyzing trace with hash -795183819, now seen corresponding path program 1 times [2020-10-23 20:27:04,979 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:04,979 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [602443513] [2020-10-23 20:27:04,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:04,983 INFO L321 leratedInterpolation]: No loops in this trace, falling back to nested interpolation [2020-10-23 20:27:05,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:05,063 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-10-23 20:27:05,068 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:05,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 13 [2020-10-23 20:27:05,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:05,110 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2020-10-23 20:27:05,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-10-23 20:27:05,163 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 20:27:05,164 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [602443513] [2020-10-23 20:27:05,164 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-10-23 20:27:05,165 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-10-23 20:27:05,165 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363236905] [2020-10-23 20:27:05,166 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-10-23 20:27:05,166 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-10-23 20:27:05,167 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-10-23 20:27:05,168 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=43, Unknown=0, NotChecked=0, Total=56 [2020-10-23 20:27:05,168 INFO L87 Difference]: Start difference. First operand 41 states and 43 transitions. Second operand 8 states. [2020-10-23 20:27:05,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-10-23 20:27:05,512 INFO L93 Difference]: Finished difference Result 55 states and 57 transitions. [2020-10-23 20:27:05,512 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-10-23 20:27:05,512 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 33 [2020-10-23 20:27:05,513 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-10-23 20:27:05,514 INFO L225 Difference]: With dead ends: 55 [2020-10-23 20:27:05,515 INFO L226 Difference]: Without dead ends: 48 [2020-10-23 20:27:05,517 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2020-10-23 20:27:05,517 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-10-23 20:27:05,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 46. [2020-10-23 20:27:05,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-10-23 20:27:05,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-10-23 20:27:05,533 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 33 [2020-10-23 20:27:05,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-10-23 20:27:05,534 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-10-23 20:27:05,534 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-10-23 20:27:05,534 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-10-23 20:27:05,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-10-23 20:27:05,536 INFO L414 BasicCegarLoop]: Found error trace [2020-10-23 20:27:05,536 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-10-23 20:27:05,537 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-10-23 20:27:05,537 INFO L429 AbstractCegarLoop]: === Iteration 3 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-10-23 20:27:05,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-10-23 20:27:05,538 INFO L82 PathProgramCache]: Analyzing trace with hash 870121323, now seen corresponding path program 1 times [2020-10-23 20:27:05,538 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-10-23 20:27:05,538 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [678444130] [2020-10-23 20:27:05,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-10-23 20:27:05,751 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 20:27:05,898 INFO L309 leratedInterpolation]: Starting analysis with loop acceleration approximation UNDERAPPROXIMATION [2020-10-23 20:27:05,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:27:05,942 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:27:05,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-10-23 20:27:05,974 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-10-23 20:27:06,009 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-10-23 20:27:06,009 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-10-23 20:27:06,010 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-10-23 20:27:06,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.10 08:27:06 BoogieIcfgContainer [2020-10-23 20:27:06,030 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-10-23 20:27:06,033 INFO L168 Benchmark]: Toolchain (without parser) took 2979.00 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 127.2 MB in the beginning and 138.8 MB in the end (delta: -11.6 MB). Peak memory consumption was 19.4 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:06,034 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.1 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:27:06,035 INFO L168 Benchmark]: CACSL2BoogieTranslator took 245.50 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:06,036 INFO L168 Benchmark]: Boogie Preprocessor took 34.77 ms. Allocated memory is still 151.0 MB. Free memory was 117.3 MB in the beginning and 115.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:06,037 INFO L168 Benchmark]: RCFGBuilder took 468.11 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 101.7 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-10-23 20:27:06,038 INFO L168 Benchmark]: TraceAbstraction took 2202.85 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 101.3 MB in the beginning and 138.8 MB in the end (delta: -37.5 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-10-23 20:27:06,041 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.1 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 245.50 ms. Allocated memory is still 151.0 MB. Free memory was 126.4 MB in the beginning and 117.3 MB in the end (delta: 9.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 34.77 ms. Allocated memory is still 151.0 MB. Free memory was 117.3 MB in the beginning and 115.9 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 8.0 GB. * RCFGBuilder took 468.11 ms. Allocated memory is still 151.0 MB. Free memory was 115.9 MB in the beginning and 101.7 MB in the end (delta: 14.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2202.85 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 101.3 MB in the beginning and 138.8 MB in the end (delta: -37.5 MB). There was no memory consumed. 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; [L21] CALL, EXPR id(input) [L10] COND FALSE !(x==0) [L11] CALL, EXPR id2(x-1) [L15] COND FALSE !(x==0) [L16] CALL, EXPR id(x-1) [L10] COND TRUE x==0 [L10] return 0; [L16] RET, EXPR id(x-1) [L16] return id(x-1) + 1; [L11] RET, EXPR id2(x-1) [L11] return id2(x-1) + 1; [L21] RET, EXPR id(input) [L21] int result = id(input); [L22] COND TRUE result != 5 [L23] CALL reach_error() [L4] __assert_fail("0", "id2_i5_o5-2.c", 4, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 46 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.1s, OverallIterations: 3, TraceHistogramMax: 2, AutomataDifference: 0.7s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 74 SDtfs, 89 SDslu, 131 SDs, 0 SdLazy, 196 SolverSat, 25 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 27 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=46occurred 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, 2 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: No data available, 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...