/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/acceleratedInterpolationWernerOverapprox_32.epf -i ../../../trunk/examples/svcomp/recursive/Ackermann02.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-b7b32d2 [2021-02-22 01:32:38,620 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-22 01:32:38,623 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-22 01:32:38,658 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-22 01:32:38,659 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-22 01:32:38,660 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-22 01:32:38,662 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-22 01:32:38,664 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-22 01:32:38,666 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-22 01:32:38,667 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-22 01:32:38,669 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-22 01:32:38,670 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-22 01:32:38,671 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-22 01:32:38,672 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-22 01:32:38,673 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-22 01:32:38,675 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-22 01:32:38,683 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-22 01:32:38,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-22 01:32:38,686 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-22 01:32:38,689 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-22 01:32:38,691 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-22 01:32:38,692 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-22 01:32:38,694 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-22 01:32:38,695 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-22 01:32:38,698 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-22 01:32:38,698 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-22 01:32:38,699 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-22 01:32:38,700 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-22 01:32:38,700 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-22 01:32:38,702 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-22 01:32:38,702 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-22 01:32:38,703 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-22 01:32:38,704 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-22 01:32:38,705 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-22 01:32:38,706 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-22 01:32:38,706 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-22 01:32:38,707 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-22 01:32:38,708 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-22 01:32:38,708 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-22 01:32:38,709 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-22 01:32:38,710 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-22 01:32:38,711 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationWernerOverapprox_32.epf [2021-02-22 01:32:38,723 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-22 01:32:38,723 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-22 01:32:38,725 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-22 01:32:38,725 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-22 01:32:38,726 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-22 01:32:38,726 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-22 01:32:38,726 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-22 01:32:38,726 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-22 01:32:38,727 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-22 01:32:38,727 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-22 01:32:38,727 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-22 01:32:38,727 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-22 01:32:38,728 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-22 01:32:38,728 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-22 01:32:38,728 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-22 01:32:38,728 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-22 01:32:38,729 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-22 01:32:38,729 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-22 01:32:38,729 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-22 01:32:38,729 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-22 01:32:38,730 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-22 01:32:38,732 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-22 01:32:38,732 INFO L138 SettingsManager]: * Loop acceleration method that is used by accelerated interpolation=WERNER_OVERAPPROX [2021-02-22 01:32:38,733 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-22 01:32:39,103 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-22 01:32:39,129 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-22 01:32:39,132 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-22 01:32:39,134 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-22 01:32:39,135 INFO L275 PluginConnector]: CDTParser initialized [2021-02-22 01:32:39,137 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive/Ackermann02.c [2021-02-22 01:32:39,222 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f2ae9b3/b6735e8ba9e94839a69a7d46b8664163/FLAGa560efcc2 [2021-02-22 01:32:39,802 INFO L306 CDTParser]: Found 1 translation units. [2021-02-22 01:32:39,803 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive/Ackermann02.c [2021-02-22 01:32:39,811 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f2ae9b3/b6735e8ba9e94839a69a7d46b8664163/FLAGa560efcc2 [2021-02-22 01:32:40,170 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/59f2ae9b3/b6735e8ba9e94839a69a7d46b8664163 [2021-02-22 01:32:40,178 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-22 01:32:40,193 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-22 01:32:40,198 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-22 01:32:40,199 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-22 01:32:40,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-22 01:32:40,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,207 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@66dbdb22 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40, skipping insertion in model container [2021-02-22 01:32:40,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,215 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-22 01:32:40,231 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-22 01:32:40,374 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/Ackermann02.c[1157,1170] [2021-02-22 01:32:40,378 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 01:32:40,399 INFO L203 MainTranslator]: Completed pre-run [2021-02-22 01:32:40,418 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/Ackermann02.c[1157,1170] [2021-02-22 01:32:40,419 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-22 01:32:40,436 INFO L208 MainTranslator]: Completed translation [2021-02-22 01:32:40,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40 WrapperNode [2021-02-22 01:32:40,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-22 01:32:40,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-22 01:32:40,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-22 01:32:40,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-22 01:32:40,452 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,453 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,461 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,461 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,467 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,469 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,471 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (1/1) ... [2021-02-22 01:32:40,473 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-22 01:32:40,474 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-22 01:32:40,474 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-22 01:32:40,474 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-22 01:32:40,475 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (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 [2021-02-22 01:32:40,581 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-22 01:32:40,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-22 01:32:40,582 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-22 01:32:40,582 INFO L138 BoogieDeclarations]: Found implementation of procedure ackermann [2021-02-22 01:32:40,582 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-22 01:32:40,583 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-22 01:32:40,583 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-22 01:32:40,583 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-22 01:32:40,583 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-22 01:32:40,584 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-22 01:32:40,584 INFO L130 BoogieDeclarations]: Found specification of procedure ackermann [2021-02-22 01:32:40,584 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-22 01:32:40,584 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-22 01:32:40,585 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-22 01:32:40,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-22 01:32:40,585 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-22 01:32:40,585 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-22 01:32:40,585 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-22 01:32:41,058 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-22 01:32:41,059 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-22 01:32:41,061 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 01:32:41 BoogieIcfgContainer [2021-02-22 01:32:41,061 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-22 01:32:41,063 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-22 01:32:41,064 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-22 01:32:41,067 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-22 01:32:41,068 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.02 01:32:40" (1/3) ... [2021-02-22 01:32:41,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15283936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 01:32:41, skipping insertion in model container [2021-02-22 01:32:41,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.02 01:32:40" (2/3) ... [2021-02-22 01:32:41,069 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15283936 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.02 01:32:41, skipping insertion in model container [2021-02-22 01:32:41,069 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.02 01:32:41" (3/3) ... [2021-02-22 01:32:41,071 INFO L111 eAbstractionObserver]: Analyzing ICFG Ackermann02.c [2021-02-22 01:32:41,105 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-22 01:32:41,110 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-22 01:32:41,129 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-22 01:32:41,154 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-22 01:32:41,155 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-22 01:32:41,155 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-22 01:32:41,155 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-22 01:32:41,155 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-22 01:32:41,155 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-22 01:32:41,156 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-22 01:32:41,156 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-22 01:32:41,174 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states. [2021-02-22 01:32:41,185 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-02-22 01:32:41,185 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:32:41,186 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] [2021-02-22 01:32:41,187 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:32:41,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:32:41,193 INFO L82 PathProgramCache]: Analyzing trace with hash 305373308, now seen corresponding path program 1 times [2021-02-22 01:32:41,203 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:32:41,203 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2119816380] [2021-02-22 01:32:41,204 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:32:41,280 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:32:41,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:41,475 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,477 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:41,478 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,479 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:41,495 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,496 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:41,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 01:32:41,571 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:41,583 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,584 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:41,586 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-02-22 01:32:41,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:41,613 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,614 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:41,621 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:41,622 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:41,638 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-02-22 01:32:41,640 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2119816380] [2021-02-22 01:32:41,642 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 01:32:41,642 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-22 01:32:41,643 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130530200] [2021-02-22 01:32:41,653 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-22 01:32:41,653 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 01:32:41,668 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-22 01:32:41,669 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-22 01:32:41,671 INFO L87 Difference]: Start difference. First operand 53 states. Second operand 6 states. [2021-02-22 01:32:42,154 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 01:32:42,155 INFO L93 Difference]: Finished difference Result 97 states and 119 transitions. [2021-02-22 01:32:42,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-02-22 01:32:42,157 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 32 [2021-02-22 01:32:42,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 01:32:42,168 INFO L225 Difference]: With dead ends: 97 [2021-02-22 01:32:42,169 INFO L226 Difference]: Without dead ends: 53 [2021-02-22 01:32:42,173 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=49, Unknown=0, NotChecked=0, Total=72 [2021-02-22 01:32:42,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-02-22 01:32:42,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-02-22 01:32:42,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2021-02-22 01:32:42,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 60 transitions. [2021-02-22 01:32:42,238 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 60 transitions. Word has length 32 [2021-02-22 01:32:42,239 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 01:32:42,239 INFO L480 AbstractCegarLoop]: Abstraction has 53 states and 60 transitions. [2021-02-22 01:32:42,239 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-22 01:32:42,239 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 60 transitions. [2021-02-22 01:32:42,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-02-22 01:32:42,243 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:32:42,243 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-22 01:32:42,244 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-22 01:32:42,244 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:32:42,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:32:42,245 INFO L82 PathProgramCache]: Analyzing trace with hash -40053035, now seen corresponding path program 1 times [2021-02-22 01:32:42,245 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:32:42,246 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1705905234] [2021-02-22 01:32:42,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:32:42,250 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:32:42,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:42,359 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,360 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:42,363 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,365 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:42,370 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,371 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:42,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 01:32:42,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:42,412 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,413 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:42,413 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-02-22 01:32:42,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:42,451 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,452 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:42,458 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,459 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:42,466 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-02-22 01:32:42,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:42,477 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,478 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:42,479 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:42,479 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:42,493 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-02-22 01:32:42,493 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1705905234] [2021-02-22 01:32:42,493 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 01:32:42,494 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-02-22 01:32:42,494 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [394776774] [2021-02-22 01:32:42,495 INFO L460 AbstractCegarLoop]: Interpolant automaton has 7 states [2021-02-22 01:32:42,495 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 01:32:42,496 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-02-22 01:32:42,497 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-02-22 01:32:42,497 INFO L87 Difference]: Start difference. First operand 53 states and 60 transitions. Second operand 7 states. [2021-02-22 01:32:42,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 01:32:42,903 INFO L93 Difference]: Finished difference Result 76 states and 93 transitions. [2021-02-22 01:32:42,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-02-22 01:32:42,904 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 42 [2021-02-22 01:32:42,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 01:32:42,909 INFO L225 Difference]: With dead ends: 76 [2021-02-22 01:32:42,909 INFO L226 Difference]: Without dead ends: 70 [2021-02-22 01:32:42,911 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-02-22 01:32:42,912 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-02-22 01:32:42,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2021-02-22 01:32:42,933 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2021-02-22 01:32:42,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 87 transitions. [2021-02-22 01:32:42,936 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 87 transitions. Word has length 42 [2021-02-22 01:32:42,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 01:32:42,936 INFO L480 AbstractCegarLoop]: Abstraction has 70 states and 87 transitions. [2021-02-22 01:32:42,936 INFO L481 AbstractCegarLoop]: Interpolant automaton has 7 states. [2021-02-22 01:32:42,936 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 87 transitions. [2021-02-22 01:32:42,939 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-02-22 01:32:42,940 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:32:42,940 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-22 01:32:42,940 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-22 01:32:42,940 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:32:42,941 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:32:42,941 INFO L82 PathProgramCache]: Analyzing trace with hash -1011067684, now seen corresponding path program 2 times [2021-02-22 01:32:42,941 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:32:42,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1243946240] [2021-02-22 01:32:42,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:32:42,944 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:32:42,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:43,000 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,001 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,003 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,004 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-22 01:32:43,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:43,064 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,065 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 20 [2021-02-22 01:32:43,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:43,094 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,095 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,096 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,096 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-02-22 01:32:43,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:43,126 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,127 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,130 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,131 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:43,144 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,145 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-22 01:32:43,150 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 4 [2021-02-22 01:32:43,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-22 01:32:43,156 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-22 01:32:43,157 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-22 01:32:43,162 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-02-22 01:32:43,163 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1243946240] [2021-02-22 01:32:43,163 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-22 01:32:43,163 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-02-22 01:32:43,164 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [509589317] [2021-02-22 01:32:43,164 INFO L460 AbstractCegarLoop]: Interpolant automaton has 5 states [2021-02-22 01:32:43,164 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-22 01:32:43,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-02-22 01:32:43,165 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-02-22 01:32:43,165 INFO L87 Difference]: Start difference. First operand 70 states and 87 transitions. Second operand 5 states. [2021-02-22 01:32:43,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-22 01:32:43,399 INFO L93 Difference]: Finished difference Result 123 states and 182 transitions. [2021-02-22 01:32:43,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-02-22 01:32:43,400 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 52 [2021-02-22 01:32:43,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-22 01:32:43,403 INFO L225 Difference]: With dead ends: 123 [2021-02-22 01:32:43,403 INFO L226 Difference]: Without dead ends: 74 [2021-02-22 01:32:43,406 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 12 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-02-22 01:32:43,407 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2021-02-22 01:32:43,429 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2021-02-22 01:32:43,430 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2021-02-22 01:32:43,431 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 97 transitions. [2021-02-22 01:32:43,432 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 97 transitions. Word has length 52 [2021-02-22 01:32:43,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-22 01:32:43,432 INFO L480 AbstractCegarLoop]: Abstraction has 74 states and 97 transitions. [2021-02-22 01:32:43,432 INFO L481 AbstractCegarLoop]: Interpolant automaton has 5 states. [2021-02-22 01:32:43,433 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 97 transitions. [2021-02-22 01:32:43,436 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2021-02-22 01:32:43,436 INFO L414 BasicCegarLoop]: Found error trace [2021-02-22 01:32:43,436 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-02-22 01:32:43,437 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-22 01:32:43,437 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-22 01:32:43,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-22 01:32:43,437 INFO L82 PathProgramCache]: Analyzing trace with hash 2141089131, now seen corresponding path program 1 times [2021-02-22 01:32:43,438 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-22 01:32:43,438 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1830612574] [2021-02-22 01:32:43,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-22 01:32:43,440 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-22 01:32:43,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 01:32:43,467 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 01:32:43,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-22 01:32:43,491 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-22 01:32:43,525 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-22 01:32:43,525 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-22 01:32:43,526 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-22 01:32:43,546 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.02 01:32:43 BoogieIcfgContainer [2021-02-22 01:32:43,546 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-22 01:32:43,548 INFO L168 Benchmark]: Toolchain (without parser) took 3365.86 ms. Allocated memory was 161.5 MB in the beginning and 199.2 MB in the end (delta: 37.7 MB). Free memory was 138.3 MB in the beginning and 149.1 MB in the end (delta: -10.8 MB). Peak memory consumption was 27.9 MB. Max. memory is 8.0 GB. [2021-02-22 01:32:43,548 INFO L168 Benchmark]: CDTParser took 0.19 ms. Allocated memory is still 161.5 MB. Free memory is still 134.9 MB. There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 01:32:43,549 INFO L168 Benchmark]: CACSL2BoogieTranslator took 238.69 ms. Allocated memory is still 161.5 MB. Free memory was 137.2 MB in the beginning and 127.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. [2021-02-22 01:32:43,550 INFO L168 Benchmark]: Boogie Preprocessor took 35.20 ms. Allocated memory is still 161.5 MB. Free memory was 127.3 MB in the beginning and 125.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-22 01:32:43,551 INFO L168 Benchmark]: RCFGBuilder took 587.56 ms. Allocated memory is still 161.5 MB. Free memory was 125.8 MB in the beginning and 109.9 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. [2021-02-22 01:32:43,552 INFO L168 Benchmark]: TraceAbstraction took 2482.64 ms. Allocated memory was 161.5 MB in the beginning and 199.2 MB in the end (delta: 37.7 MB). Free memory was 109.5 MB in the beginning and 149.1 MB in the end (delta: -39.6 MB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-22 01:32:43,555 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.19 ms. Allocated memory is still 161.5 MB. Free memory is still 134.9 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 238.69 ms. Allocated memory is still 161.5 MB. Free memory was 137.2 MB in the beginning and 127.3 MB in the end (delta: 9.9 MB). Peak memory consumption was 10.5 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.20 ms. Allocated memory is still 161.5 MB. Free memory was 127.3 MB in the beginning and 125.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 587.56 ms. Allocated memory is still 161.5 MB. Free memory was 125.8 MB in the beginning and 109.9 MB in the end (delta: 15.9 MB). Peak memory consumption was 15.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 2482.64 ms. Allocated memory was 161.5 MB in the beginning and 199.2 MB in the end (delta: 37.7 MB). Free memory was 109.5 MB in the beginning and 149.1 MB in the end (delta: -39.6 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 45]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L28] int m = __VERIFIER_nondet_int(); [L29] COND FALSE !(m < 0 || m > 3) [L34] int n = __VERIFIER_nondet_int(); [L35] COND FALSE !(n < 0 || n > 23) [L41] CALL, EXPR ackermann(m,n) [L17] COND FALSE !(m==0) [L20] COND TRUE n==0 [L21] CALL, EXPR ackermann(m-1,1) [L17] COND FALSE !(m==0) [L20] COND FALSE !(n==0) [L23] CALL, EXPR ackermann(m,n-1) [L17] COND FALSE !(m==0) [L20] COND TRUE n==0 [L21] CALL, EXPR ackermann(m-1,1) [L17] COND TRUE m==0 [L18] return n+1; [L21] RET, EXPR ackermann(m-1,1) [L21] return ackermann(m-1,1); [L23] RET, EXPR ackermann(m,n-1) [L23] CALL, EXPR ackermann(m-1,ackermann(m,n-1)) [L17] COND TRUE m==0 [L18] return n+1; [L23] RET, EXPR ackermann(m-1,ackermann(m,n-1)) [L23] return ackermann(m-1,ackermann(m,n-1)); [L21] RET, EXPR ackermann(m-1,1) [L21] return ackermann(m-1,1); [L41] RET, EXPR ackermann(m,n) [L41] int result = ackermann(m,n); [L42] COND FALSE !(m < 2 || result >= 4) [L45] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 56 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.3s, OverallIterations: 4, TraceHistogramMax: 5, AutomataDifference: 1.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 152 SDtfs, 192 SDslu, 117 SDs, 0 SdLazy, 353 SolverSat, 90 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.5s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 45 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=74occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 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...