/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/id_b3_o2-2.c -------------------------------------------------------------------------------- This is Ultimate 0.2.1-dev-36cd7be [2021-02-23 17:55:37,845 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-02-23 17:55:37,848 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-02-23 17:55:37,884 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-02-23 17:55:37,884 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-02-23 17:55:37,886 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-02-23 17:55:37,888 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-02-23 17:55:37,890 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-02-23 17:55:37,892 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-02-23 17:55:37,894 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-02-23 17:55:37,895 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-02-23 17:55:37,897 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-02-23 17:55:37,897 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-02-23 17:55:37,898 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-02-23 17:55:37,900 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-02-23 17:55:37,901 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-02-23 17:55:37,902 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-02-23 17:55:37,904 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-02-23 17:55:37,906 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-02-23 17:55:37,908 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-02-23 17:55:37,910 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-02-23 17:55:37,913 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-02-23 17:55:37,916 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-02-23 17:55:37,929 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-02-23 17:55:37,933 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-02-23 17:55:37,933 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-02-23 17:55:37,934 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-02-23 17:55:37,935 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-02-23 17:55:37,935 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-02-23 17:55:37,937 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-02-23 17:55:37,937 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-02-23 17:55:37,938 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-02-23 17:55:37,939 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-02-23 17:55:37,940 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-02-23 17:55:37,941 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-02-23 17:55:37,942 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-02-23 17:55:37,943 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-02-23 17:55:37,943 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-02-23 17:55:37,943 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-02-23 17:55:37,944 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-02-23 17:55:37,945 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-02-23 17:55:37,946 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2021-02-23 17:55:37,959 INFO L113 SettingsManager]: Loading preferences was successful [2021-02-23 17:55:37,960 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-02-23 17:55:37,961 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-02-23 17:55:37,962 INFO L138 SettingsManager]: * sizeof long=4 [2021-02-23 17:55:37,962 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-02-23 17:55:37,962 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-02-23 17:55:37,963 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-02-23 17:55:37,963 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-02-23 17:55:37,963 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-02-23 17:55:37,963 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-02-23 17:55:37,964 INFO L138 SettingsManager]: * sizeof long double=12 [2021-02-23 17:55:37,964 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-02-23 17:55:37,964 INFO L138 SettingsManager]: * Use constant arrays=true [2021-02-23 17:55:37,964 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-02-23 17:55:37,965 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-02-23 17:55:37,965 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2021-02-23 17:55:37,965 INFO L138 SettingsManager]: * To the following directory=./dump/ [2021-02-23 17:55:37,965 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-02-23 17:55:37,965 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-02-23 17:55:37,966 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-02-23 17:55:37,966 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2021-02-23 17:55:37,966 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-02-23 17:55:37,966 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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release [2021-02-23 17:55:38,329 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-02-23 17:55:38,366 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-02-23 17:55:38,370 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-02-23 17:55:38,372 INFO L271 PluginConnector]: Initializing CDTParser... [2021-02-23 17:55:38,372 INFO L275 PluginConnector]: CDTParser initialized [2021-02-23 17:55:38,373 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c [2021-02-23 17:55:38,448 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef219527/8b740a863d444f18bb8592c0026f4887/FLAGcda183f0f [2021-02-23 17:55:39,038 INFO L306 CDTParser]: Found 1 translation units. [2021-02-23 17:55:39,039 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/id_b3_o2-2.c [2021-02-23 17:55:39,046 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef219527/8b740a863d444f18bb8592c0026f4887/FLAGcda183f0f [2021-02-23 17:55:39,376 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/0ef219527/8b740a863d444f18bb8592c0026f4887 [2021-02-23 17:55:39,384 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-02-23 17:55:39,405 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2021-02-23 17:55:39,411 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-02-23 17:55:39,412 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-02-23 17:55:39,416 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-02-23 17:55:39,417 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,419 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e92c54e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39, skipping insertion in model container [2021-02-23 17:55:39,419 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,430 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-02-23 17:55:39,450 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-02-23 17:55:39,670 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/id_b3_o2-2.c[528,541] [2021-02-23 17:55:39,676 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:55:39,692 INFO L203 MainTranslator]: Completed pre-run [2021-02-23 17:55:39,709 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/id_b3_o2-2.c[528,541] [2021-02-23 17:55:39,710 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-02-23 17:55:39,727 INFO L208 MainTranslator]: Completed translation [2021-02-23 17:55:39,728 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39 WrapperNode [2021-02-23 17:55:39,728 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-02-23 17:55:39,729 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-02-23 17:55:39,729 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-02-23 17:55:39,729 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-02-23 17:55:39,743 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,744 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,752 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,752 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,758 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,760 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,762 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (1/1) ... [2021-02-23 17:55:39,764 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-02-23 17:55:39,765 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-02-23 17:55:39,766 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-02-23 17:55:39,766 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-02-23 17:55:39,767 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (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 17:55:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2021-02-23 17:55:39,875 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-02-23 17:55:39,876 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2021-02-23 17:55:39,876 INFO L138 BoogieDeclarations]: Found implementation of procedure id [2021-02-23 17:55:39,876 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2021-02-23 17:55:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2021-02-23 17:55:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2021-02-23 17:55:39,876 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure id [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure main [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2021-02-23 17:55:39,877 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-02-23 17:55:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-02-23 17:55:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-02-23 17:55:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-02-23 17:55:39,878 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-02-23 17:55:40,170 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-02-23 17:55:40,170 INFO L299 CfgBuilder]: Removed 0 assume(true) statements. [2021-02-23 17:55:40,172 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:55:40 BoogieIcfgContainer [2021-02-23 17:55:40,172 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-02-23 17:55:40,174 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-02-23 17:55:40,175 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-02-23 17:55:40,179 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-02-23 17:55:40,179 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.02 05:55:39" (1/3) ... [2021-02-23 17:55:40,180 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338d739 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:55:40, skipping insertion in model container [2021-02-23 17:55:40,180 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.02 05:55:39" (2/3) ... [2021-02-23 17:55:40,181 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338d739 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.02 05:55:40, skipping insertion in model container [2021-02-23 17:55:40,181 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.02 05:55:40" (3/3) ... [2021-02-23 17:55:40,183 INFO L111 eAbstractionObserver]: Analyzing ICFG id_b3_o2-2.c [2021-02-23 17:55:40,191 INFO L153 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:AcceleratedInterpolation Determinization: PREDICATE_ABSTRACTION [2021-02-23 17:55:40,196 INFO L165 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2021-02-23 17:55:40,238 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-02-23 17:55:40,286 INFO L376 AbstractCegarLoop]: Interprodecural is true [2021-02-23 17:55:40,287 INFO L377 AbstractCegarLoop]: Hoare is true [2021-02-23 17:55:40,287 INFO L378 AbstractCegarLoop]: Compute interpolants for AcceleratedInterpolation [2021-02-23 17:55:40,287 INFO L379 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2021-02-23 17:55:40,287 INFO L380 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2021-02-23 17:55:40,287 INFO L381 AbstractCegarLoop]: Difference is false [2021-02-23 17:55:40,288 INFO L382 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2021-02-23 17:55:40,288 INFO L386 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2021-02-23 17:55:40,303 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states. [2021-02-23 17:55:40,312 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-02-23 17:55:40,313 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:55:40,314 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] [2021-02-23 17:55:40,314 INFO L428 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:55:40,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:55:40,321 INFO L82 PathProgramCache]: Analyzing trace with hash -1860388581, now seen corresponding path program 1 times [2021-02-23 17:55:40,332 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:55:40,332 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [699687224] [2021-02-23 17:55:40,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:55:40,419 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:55:40,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:40,584 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,587 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:40,590 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,591 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:40,611 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,614 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:40,635 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,637 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:40,691 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:55:40,697 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:40,711 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,712 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:40,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-02-23 17:55:40,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:40,727 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,728 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:40,729 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:40,730 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:40,745 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 17:55:40,747 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [699687224] [2021-02-23 17:55:40,750 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:55:40,750 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 17:55:40,750 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1031045411] [2021-02-23 17:55:40,756 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 17:55:40,756 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:55:40,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 17:55:40,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 17:55:40,775 INFO L87 Difference]: Start difference. First operand 39 states. Second operand 6 states. [2021-02-23 17:55:41,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:55:41,233 INFO L93 Difference]: Finished difference Result 53 states and 57 transitions. [2021-02-23 17:55:41,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 17:55:41,238 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 26 [2021-02-23 17:55:41,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:55:41,255 INFO L225 Difference]: With dead ends: 53 [2021-02-23 17:55:41,255 INFO L226 Difference]: Without dead ends: 36 [2021-02-23 17:55:41,259 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 17:55:41,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-02-23 17:55:41,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-02-23 17:55:41,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2021-02-23 17:55:41,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-02-23 17:55:41,328 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 26 [2021-02-23 17:55:41,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:55:41,329 INFO L480 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-02-23 17:55:41,329 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 17:55:41,329 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-02-23 17:55:41,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-02-23 17:55:41,332 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:55:41,332 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] [2021-02-23 17:55:41,332 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-02-23 17:55:41,333 INFO L428 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:55:41,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:55:41,334 INFO L82 PathProgramCache]: Analyzing trace with hash -558808662, now seen corresponding path program 1 times [2021-02-23 17:55:41,334 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:55:41,334 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1574929857] [2021-02-23 17:55:41,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:55:41,339 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:55:41,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:41,450 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,450 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,451 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,452 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:55:41,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:41,518 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,520 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-02-23 17:55:41,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:41,589 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,590 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,591 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,592 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:41,597 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,598 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:41,603 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,604 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 17:55:41,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:41,616 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,617 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:41,618 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:41,618 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:41,629 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-23 17:55:41,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1574929857] [2021-02-23 17:55:41,630 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:55:41,630 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 17:55:41,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [20671978] [2021-02-23 17:55:41,632 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 17:55:41,633 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:55:41,634 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 17:55:41,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 17:55:41,637 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 6 states. [2021-02-23 17:55:41,922 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:55:41,923 INFO L93 Difference]: Finished difference Result 57 states and 62 transitions. [2021-02-23 17:55:41,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 17:55:41,928 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 36 [2021-02-23 17:55:41,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:55:41,930 INFO L225 Difference]: With dead ends: 57 [2021-02-23 17:55:41,930 INFO L226 Difference]: Without dead ends: 43 [2021-02-23 17:55:41,934 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 17:55:41,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-02-23 17:55:41,963 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2021-02-23 17:55:41,963 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2021-02-23 17:55:41,964 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2021-02-23 17:55:41,965 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 36 [2021-02-23 17:55:41,966 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:55:41,967 INFO L480 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2021-02-23 17:55:41,967 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 17:55:41,967 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2021-02-23 17:55:41,968 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-02-23 17:55:41,968 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:55:41,969 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] [2021-02-23 17:55:41,969 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-02-23 17:55:41,969 INFO L428 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:55:41,970 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:55:41,972 INFO L82 PathProgramCache]: Analyzing trace with hash -688096918, now seen corresponding path program 1 times [2021-02-23 17:55:41,973 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:55:41,973 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2050097042] [2021-02-23 17:55:41,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:55:41,979 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:55:42,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,044 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,044 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,045 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,046 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,049 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,050 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,053 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,054 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:55:42,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,102 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,103 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,103 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-02-23 17:55:42,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,156 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,159 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,160 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,162 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,172 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,173 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,182 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,183 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 17:55:42,206 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,220 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,221 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,224 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,225 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,238 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-02-23 17:55:42,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2050097042] [2021-02-23 17:55:42,239 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:55:42,239 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2021-02-23 17:55:42,240 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [968512813] [2021-02-23 17:55:42,242 INFO L460 AbstractCegarLoop]: Interpolant automaton has 9 states [2021-02-23 17:55:42,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:55:42,245 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-02-23 17:55:42,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2021-02-23 17:55:42,247 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 9 states. [2021-02-23 17:55:42,692 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:55:42,692 INFO L93 Difference]: Finished difference Result 49 states and 51 transitions. [2021-02-23 17:55:42,693 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-02-23 17:55:42,693 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2021-02-23 17:55:42,693 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:55:42,695 INFO L225 Difference]: With dead ends: 49 [2021-02-23 17:55:42,695 INFO L226 Difference]: Without dead ends: 43 [2021-02-23 17:55:42,696 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=57, Invalid=215, Unknown=0, NotChecked=0, Total=272 [2021-02-23 17:55:42,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-02-23 17:55:42,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-02-23 17:55:42,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2021-02-23 17:55:42,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-02-23 17:55:42,711 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 36 [2021-02-23 17:55:42,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:55:42,712 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-02-23 17:55:42,712 INFO L481 AbstractCegarLoop]: Interpolant automaton has 9 states. [2021-02-23 17:55:42,712 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-02-23 17:55:42,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-02-23 17:55:42,714 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:55:42,714 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 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] [2021-02-23 17:55:42,714 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-02-23 17:55:42,715 INFO L428 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:55:42,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:55:42,715 INFO L82 PathProgramCache]: Analyzing trace with hash -1524591493, now seen corresponding path program 1 times [2021-02-23 17:55:42,715 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:55:42,716 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [575880844] [2021-02-23 17:55:42,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:55:42,718 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:55:42,733 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,751 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,752 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,753 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,753 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,757 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,758 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,762 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,763 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,789 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2021-02-23 17:55:42,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,803 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,804 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,805 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 15 [2021-02-23 17:55:42,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,828 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,829 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,830 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,830 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 3 [2021-02-23 17:55:42,837 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 17:55:42,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,843 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,844 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,844 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 2 [2021-02-23 17:55:42,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-02-23 17:55:42,849 WARN L141 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size [2021-02-23 17:55:42,849 WARN L147 QuantifierPusher]: treesize reduction 0, result has 100.0 percent of original size 1 [2021-02-23 17:55:42,853 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-02-23 17:55:42,853 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [575880844] [2021-02-23 17:55:42,854 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-02-23 17:55:42,854 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-02-23 17:55:42,854 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [197910445] [2021-02-23 17:55:42,855 INFO L460 AbstractCegarLoop]: Interpolant automaton has 6 states [2021-02-23 17:55:42,855 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2021-02-23 17:55:42,855 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-02-23 17:55:42,856 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-02-23 17:55:42,856 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand 6 states. [2021-02-23 17:55:43,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-02-23 17:55:43,084 INFO L93 Difference]: Finished difference Result 51 states and 53 transitions. [2021-02-23 17:55:43,084 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-02-23 17:55:43,085 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 46 [2021-02-23 17:55:43,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-02-23 17:55:43,086 INFO L225 Difference]: With dead ends: 51 [2021-02-23 17:55:43,087 INFO L226 Difference]: Without dead ends: 45 [2021-02-23 17:55:43,087 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2021-02-23 17:55:43,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-02-23 17:55:43,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 43. [2021-02-23 17:55:43,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2021-02-23 17:55:43,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-02-23 17:55:43,101 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 46 [2021-02-23 17:55:43,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-02-23 17:55:43,101 INFO L480 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-02-23 17:55:43,101 INFO L481 AbstractCegarLoop]: Interpolant automaton has 6 states. [2021-02-23 17:55:43,102 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-02-23 17:55:43,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-02-23 17:55:43,103 INFO L414 BasicCegarLoop]: Found error trace [2021-02-23 17:55:43,103 INFO L422 BasicCegarLoop]: trace histogram [3, 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] [2021-02-23 17:55:43,104 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-02-23 17:55:43,104 INFO L428 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2021-02-23 17:55:43,104 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-02-23 17:55:43,104 INFO L82 PathProgramCache]: Analyzing trace with hash -1653879749, now seen corresponding path program 2 times [2021-02-23 17:55:43,105 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2021-02-23 17:55:43,105 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [970849931] [2021-02-23 17:55:43,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-02-23 17:55:43,107 INFO L218 tedInterpolationCore]: No loops in this trace, falling back to nested interpolation [2021-02-23 17:55:43,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:55:43,156 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:55:43,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2021-02-23 17:55:43,213 INFO L223 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2021-02-23 17:55:43,251 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2021-02-23 17:55:43,252 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2021-02-23 17:55:43,254 WARN L517 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-02-23 17:55:43,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 23.02 05:55:43 BoogieIcfgContainer [2021-02-23 17:55:43,278 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-02-23 17:55:43,280 INFO L168 Benchmark]: Toolchain (without parser) took 3891.52 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 127.3 MB in the beginning and 78.7 MB in the end (delta: 48.6 MB). Peak memory consumption was 79.7 MB. Max. memory is 8.0 GB. [2021-02-23 17:55:43,282 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory was 125.8 MB in the beginning and 125.4 MB in the end (delta: 435.2 kB). There was no memory consumed. Max. memory is 8.0 GB. [2021-02-23 17:55:43,288 INFO L168 Benchmark]: CACSL2BoogieTranslator took 317.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 117.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2021-02-23 17:55:43,290 INFO L168 Benchmark]: Boogie Preprocessor took 35.36 ms. Allocated memory is still 151.0 MB. Free memory was 117.1 MB in the beginning and 115.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2021-02-23 17:55:43,295 INFO L168 Benchmark]: RCFGBuilder took 407.15 ms. Allocated memory is still 151.0 MB. Free memory was 115.8 MB in the beginning and 101.4 MB in the end (delta: 14.4 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. [2021-02-23 17:55:43,295 INFO L168 Benchmark]: TraceAbstraction took 3103.59 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 100.8 MB in the beginning and 79.2 MB in the end (delta: 21.6 MB). Peak memory consumption was 53.4 MB. Max. memory is 8.0 GB. [2021-02-23 17:55:43,304 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 was 125.8 MB in the beginning and 125.4 MB in the end (delta: 435.2 kB). There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 317.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.3 MB in the beginning and 117.1 MB in the end (delta: 9.1 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 35.36 ms. Allocated memory is still 151.0 MB. Free memory was 117.1 MB in the beginning and 115.8 MB in the end (delta: 1.3 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 407.15 ms. Allocated memory is still 151.0 MB. Free memory was 115.8 MB in the beginning and 101.4 MB in the end (delta: 14.4 MB). Peak memory consumption was 14.7 MB. Max. memory is 8.0 GB. * TraceAbstraction took 3103.59 ms. Allocated memory was 151.0 MB in the beginning and 181.4 MB in the end (delta: 30.4 MB). Free memory was 100.8 MB in the beginning and 79.2 MB in the end (delta: 21.6 MB). Peak memory consumption was 53.4 MB. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 17]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L14] int input = __VERIFIER_nondet_int(); [L15] CALL, EXPR id(input) [L7] COND FALSE !(x==0) [L8] CALL, EXPR id((unsigned int)x-1) [L7] COND FALSE !(x==0) [L8] CALL, EXPR id((unsigned int)x-1) [L7] COND TRUE x==0 [L7] return 0; [L8] RET, EXPR id((unsigned int)x-1) [L8] int ret = id((unsigned int)x-1) + 1; [L9] COND FALSE !(ret > 3) [L10] return ret; [L8] RET, EXPR id((unsigned int)x-1) [L8] int ret = id((unsigned int)x-1) + 1; [L9] COND FALSE !(ret > 3) [L10] return ret; [L15] RET, EXPR id(input) [L15] int result = id(input); [L16] COND TRUE result == 2 [L17] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 42 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.9s, OverallIterations: 5, TraceHistogramMax: 3, AutomataDifference: 1.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 128 SDtfs, 120 SDslu, 215 SDs, 0 SdLazy, 382 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 69 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 0.8s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=43occurred 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: 0.1s AutomataMinimizationTime, 4 MinimizatonAttempts, 5 StatesRemovedByMinimization, 2 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...