/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_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 13:15:20,711 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 13:15:20,717 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 13:15:20,774 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... 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[2021-02-23 13:15:20,805 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 13:15:20,807 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 13:15:20,809 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 13:15:20,811 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 13:15:20,815 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 13:15:20,816 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 13:15:20,823 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 13:15:20,831 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 13:15:20,832 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 13:15:20,834 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 13:15:20,836 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 13:15:20,838 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 13:15:20,847 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2021-02-23 13:15:20,858 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 13:15:20,859 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 13:15:20,859 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 13:15:20,860 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 [2021-02-23 13:15:20,914 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 13:15:20,915 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 13:15:20,920 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-02-23 13:15:20,920 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-02-23 13:15:20,920 INFO L138 SettingsManager]: * Use SBE=true [2021-02-23 13:15:20,921 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 13:15:20,921 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 13:15:20,921 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 13:15:20,921 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 13:15:20,922 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 13:15:20,923 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 13:15:20,923 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 13:15:20,923 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 13:15:20,924 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 13:15:20,924 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 13:15:20,924 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 13:15:20,924 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 13:15:20,925 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 13:15:20,925 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-02-23 13:15:20,925 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 13:15:20,926 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 13:15:20,926 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 13:15:20,926 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-02-23 13:15:20,926 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-02-23 13:15:20,927 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2021-02-23 13:15:20,927 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-02-23 13:15:20,927 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 13:15:20,927 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-02-23 13:15:20,927 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 13:15:21,360 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 13:15:21,396 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 13:15:21,399 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 13:15:21,401 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 13:15:21,402 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 13:15:21,403 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2021-02-23 13:15:21,490 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/467af8be5/9dcc9994fdb14beb85ef2c89cc46a87d/FLAG61b164eee [2021-02-23 13:15:22,075 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 13:15:22,076 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2021-02-23 13:15:22,083 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/467af8be5/9dcc9994fdb14beb85ef2c89cc46a87d/FLAG61b164eee [2021-02-23 13:15:22,439 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/467af8be5/9dcc9994fdb14beb85ef2c89cc46a87d [2021-02-23 13:15:22,449 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 13:15:22,465 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 13:15:22,469 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 13:15:22,470 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 13:15:22,474 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 13:15:22,475 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,477 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1abf4163 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22, skipping insertion in model container [2021-02-23 13:15:22,477 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,486 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 13:15:22,503 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 13:15:22,714 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c[354,367] [2021-02-23 13:15:22,719 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c[442,455] [2021-02-23 13:15:22,721 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 13:15:22,733 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 13:15:22,750 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c[354,367] [2021-02-23 13:15:22,752 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c[442,455] [2021-02-23 13:15:22,753 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 13:15:22,771 INFO L208 MainTranslator]: Completed translation [2021-02-23 13:15:22,771 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22 WrapperNode [2021-02-23 13:15:22,772 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 13:15:22,773 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 13:15:22,773 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 13:15:22,773 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 13:15:22,788 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,789 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,796 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,797 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,803 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,805 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,806 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (1/1) ... [2021-02-23 13:15:22,808 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 13:15:22,810 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 13:15:22,810 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 13:15:22,810 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 13:15:22,811 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (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 [2021-02-23 13:15:22,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 13:15:22,934 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 13:15:22,934 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 13:15:22,935 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-02-23 13:15:22,935 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2021-02-23 13:15:22,935 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 13:15:22,935 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 13:15:22,936 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 13:15:22,936 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 13:15:22,936 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 13:15:22,936 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-02-23 13:15:22,936 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2021-02-23 13:15:22,937 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 13:15:22,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 13:15:22,937 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 13:15:22,937 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 13:15:22,938 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 13:15:22,938 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 13:15:22,938 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 13:15:23,234 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 13:15:23,234 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-23 13:15:23,236 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 01:15:23 BoogieIcfgContainer [2021-02-23 13:15:23,236 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 13:15:23,238 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 13:15:23,238 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 13:15:23,242 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 13:15:23,242 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 01:15:22" (1/3) ... [2021-02-23 13:15:23,243 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2366bf13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 01:15:23, skipping insertion in model container [2021-02-23 13:15:23,243 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 01:15:22" (2/3) ... [2021-02-23 13:15:23,244 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2366bf13 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 01:15:23, skipping insertion in model container [2021-02-23 13:15:23,244 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 01:15:23" (3/3) ... [2021-02-23 13:15:23,246 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2021-02-23 13:15:23,253 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-02-23 13:15:23,258 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 2 error locations. [2021-02-23 13:15:23,281 INFO L253 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-02-23 13:15:23,320 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 13:15:23,321 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 13:15:23,321 INFO L378 AbstractCegarLoop]: Compute interpolants for FPandBP [2021-02-23 13:15:23,321 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 13:15:23,321 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 13:15:23,321 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 13:15:23,322 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 13:15:23,322 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 13:15:23,340 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2021-02-23 13:15:23,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-02-23 13:15:23,347 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 13:15:23,348 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 13:15:23,349 INFO L428 AbstractCegarLoop]: === Iteration 1 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 13:15:23,356 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 13:15:23,356 INFO L82 PathProgramCache]: Analyzing trace with hash -900640831, now seen corresponding path program 1 times [2021-02-23 13:15:23,367 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-23 13:15:23,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [655500519] [2021-02-23 13:15:23,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 13:15:23,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 13:15:23,578 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,580 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 13:15:23,581 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,583 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 13:15:23,600 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,601 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 13:15:23,612 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,613 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 13:15:23,625 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,626 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 13:15:23,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 13:15:23,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 13:15:23,710 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,711 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 13:15:23,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 8 [2021-02-23 13:15:23,720 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 13:15:23,736 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,737 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 13:15:23,754 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 13:15:23,755 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 13:15:23,788 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-23 13:15:23,789 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [655500519] [2021-02-23 13:15:23,790 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 13:15:23,790 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-02-23 13:15:23,791 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775188301] [2021-02-23 13:15:23,796 INFO L460 AbstractCegarLoop]: Interpolant automaton has 8 states [2021-02-23 13:15:23,797 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2021-02-23 13:15:23,811 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-02-23 13:15:23,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-02-23 13:15:23,815 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 8 states. [2021-02-23 13:15:24,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 13:15:24,300 INFO L93 Difference]: Finished difference Result 35 states and 40 transitions. [2021-02-23 13:15:24,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-23 13:15:24,302 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2021-02-23 13:15:24,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 13:15:24,311 INFO L225 Difference]: With dead ends: 35 [2021-02-23 13:15:24,311 INFO L226 Difference]: Without dead ends: 23 [2021-02-23 13:15:24,315 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=42, Invalid=114, Unknown=0, NotChecked=0, Total=156 [2021-02-23 13:15:24,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-02-23 13:15:24,359 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-02-23 13:15:24,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2021-02-23 13:15:24,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2021-02-23 13:15:24,364 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 14 [2021-02-23 13:15:24,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 13:15:24,364 INFO L480 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2021-02-23 13:15:24,364 INFO L481 AbstractCegarLoop]: Interpolant automaton has 8 states. [2021-02-23 13:15:24,365 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2021-02-23 13:15:24,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-02-23 13:15:24,366 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 13:15:24,366 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-23 13:15:24,366 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 13:15:24,367 INFO L428 AbstractCegarLoop]: === Iteration 2 === [fErr0ASSERT_VIOLATIONERROR_FUNCTION, f2Err0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 13:15:24,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 13:15:24,368 INFO L82 PathProgramCache]: Analyzing trace with hash 817530876, now seen corresponding path program 1 times [2021-02-23 13:15:24,368 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2021-02-23 13:15:24,368 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180047892] [2021-02-23 13:15:24,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 13:15:24,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 13:15:24,415 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 13:15:24,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 13:15:24,462 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 13:15:24,507 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2021-02-23 13:15:24,508 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 13:15:24,509 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 13:15:24,557 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 01:15:24 BoogieIcfgContainer [2021-02-23 13:15:24,558 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 13:15:24,563 INFO L168 Benchmark]: Toolchain (without parser) took 2107.88 ms. Allocated memory is still 165.7 MB. Free memory was 139.1 MB in the beginning and 112.5 MB in the end (delta: 26.5 MB). Peak memory consumption was 27.6 MB. Max. memory is 8.0 GB. [2021-02-23 13:15:24,566 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 165.7 MB. Free memory is still 147.3 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 13:15:24,569 INFO L168 Benchmark]: CACSL2BoogieTranslator took 302.98 ms. Allocated memory is still 165.7 MB. Free memory was 138.0 MB in the beginning and 128.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-23 13:15:24,570 INFO L168 Benchmark]: Boogie Preprocessor took 35.62 ms. Allocated memory is still 165.7 MB. Free memory was 128.7 MB in the beginning and 127.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-23 13:15:24,572 INFO L168 Benchmark]: RCFGBuilder took 426.76 ms. Allocated memory is still 165.7 MB. Free memory was 127.4 MB in the beginning and 143.6 MB in the end (delta: -16.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 8.0 GB. [2021-02-23 13:15:24,573 INFO L168 Benchmark]: TraceAbstraction took 1319.98 ms. Allocated memory is still 165.7 MB. Free memory was 143.1 MB in the beginning and 112.5 MB in the end (delta: 30.6 MB). Peak memory consumption was 30.5 MB. Max. memory is 8.0 GB. [2021-02-23 13:15:24,587 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 165.7 MB. Free memory is still 147.3 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 302.98 ms. Allocated memory is still 165.7 MB. Free memory was 138.0 MB in the beginning and 128.9 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.62 ms. Allocated memory is still 165.7 MB. Free memory was 128.7 MB in the beginning and 127.4 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 426.76 ms. Allocated memory is still 165.7 MB. Free memory was 127.4 MB in the beginning and 143.6 MB in the end (delta: -16.2 MB). Peak memory consumption was 12.8 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1319.98 ms. Allocated memory is still 165.7 MB. Free memory was 143.1 MB in the beginning and 112.5 MB in the end (delta: 30.6 MB). Peak memory consumption was 30.5 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 19]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L23] CALL f(4) VAL [\old(n)=4] [L9] COND FALSE !(n<3) [L10] n-- VAL [\old(n)=4, n=3] [L11] CALL f2(n) VAL [\old(n)=3] [L16] COND FALSE !(n<3) [L17] n-- VAL [\old(n)=3, n=2] [L18] CALL f(n) VAL [\old(n)=2] [L9] COND TRUE n<3 VAL [\old(n)=2, n=2] [L18] RET f(n) VAL [\old(n)=3, n=2] [L19] reach_error() VAL [\old(n)=3, n=2] - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 27 locations, 2 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.1s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 13 SDtfs, 13 SDslu, 33 SDs, 0 SdLazy, 71 SolverSat, 10 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=24occurred 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, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.0s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 31 NumberOfCodeBlocks, 31 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 13 ConstructedInterpolants, 0 QuantifiedInterpolants, 715 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 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...