./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 24df3a04bdb7e751c4f0d163e80822f74241222ac6f56a91a0bf72df65694e1b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:56:36,278 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:56:36,282 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:56:36,325 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:56:36,325 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:56:36,327 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:56:36,330 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:56:36,332 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:56:36,335 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:56:36,337 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:56:36,338 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:56:36,341 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:56:36,344 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:56:36,348 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:56:36,350 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:56:36,353 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:56:36,355 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:56:36,362 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:56:36,364 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:56:36,369 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:56:36,375 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:56:36,377 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:56:36,381 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:56:36,383 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:56:36,392 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:56:36,397 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:56:36,398 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:56:36,399 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:56:36,401 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:56:36,403 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:56:36,404 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:56:36,405 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:56:36,408 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:56:36,409 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:56:36,411 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:56:36,412 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:56:36,412 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:56:36,413 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:56:36,413 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:56:36,414 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:56:36,415 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:56:36,417 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:56:36,465 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:56:36,466 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:56:36,466 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:56:36,466 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:56:36,467 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:56:36,468 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:56:36,468 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:56:36,468 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:56:36,469 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:56:36,469 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:56:36,469 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:56:36,469 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:56:36,470 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:56:36,470 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:56:36,470 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:56:36,470 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:56:36,471 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:56:36,471 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:56:36,472 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:56:36,472 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:56:36,473 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:56:36,473 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:56:36,473 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:56:36,473 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:56:36,474 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:56:36,474 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:56:36,474 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:56:36,474 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:56:36,475 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:56:36,475 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:56:36,475 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:56:36,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:56:36,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:36,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:56:36,476 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:56:36,477 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:56:36,477 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:56:36,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:56:36,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:56:36,478 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:56:36,478 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:56:36,478 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 24df3a04bdb7e751c4f0d163e80822f74241222ac6f56a91a0bf72df65694e1b [2021-11-23 02:56:36,788 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:56:36,815 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:56:36,818 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:56:36,820 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:56:36,821 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:56:36,823 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/gcd_1+newton_2_8.i [2021-11-23 02:56:36,909 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/data/2c0e98399/0c0c10af8d0c4c1697a9ee0a6b005a8f/FLAG85fb62248 [2021-11-23 02:56:37,419 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:56:37,419 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i [2021-11-23 02:56:37,428 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/data/2c0e98399/0c0c10af8d0c4c1697a9ee0a6b005a8f/FLAG85fb62248 [2021-11-23 02:56:37,777 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/data/2c0e98399/0c0c10af8d0c4c1697a9ee0a6b005a8f [2021-11-23 02:56:37,780 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:56:37,782 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:56:37,795 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:37,796 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:56:37,800 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:56:37,801 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:37" (1/1) ... [2021-11-23 02:56:37,803 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ba77917 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:37, skipping insertion in model container [2021-11-23 02:56:37,803 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:56:37" (1/1) ... [2021-11-23 02:56:37,812 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:56:37,837 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:56:38,080 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[1226,1239] [2021-11-23 02:56:38,155 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[2807,2820] [2021-11-23 02:56:38,164 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:38,172 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:56:38,185 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[1226,1239] [2021-11-23 02:56:38,199 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/sv-benchmarks/c/combinations/gcd_1+newton_2_8.i[2807,2820] [2021-11-23 02:56:38,201 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:56:38,218 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:56:38,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38 WrapperNode [2021-11-23 02:56:38,226 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:56:38,227 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:38,227 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:56:38,228 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:56:38,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,248 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,277 INFO L137 Inliner]: procedures = 27, calls = 16, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 77 [2021-11-23 02:56:38,277 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:56:38,278 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:56:38,280 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:56:38,281 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:56:38,292 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,293 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,308 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,315 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,322 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,343 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,345 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,348 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:56:38,349 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:56:38,349 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:56:38,350 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:56:38,351 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (1/1) ... [2021-11-23 02:56:38,367 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:56:38,384 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:38,399 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:56:38,410 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:56:38,456 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:56:38,456 INFO L130 BoogieDeclarations]: Found specification of procedure fp [2021-11-23 02:56:38,456 INFO L138 BoogieDeclarations]: Found implementation of procedure fp [2021-11-23 02:56:38,456 INFO L130 BoogieDeclarations]: Found specification of procedure f [2021-11-23 02:56:38,457 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2021-11-23 02:56:38,457 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:56:38,457 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:56:38,457 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:56:38,540 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:56:38,542 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:56:38,738 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:56:38,805 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:56:38,805 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:56:38,808 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:38 BoogieIcfgContainer [2021-11-23 02:56:38,808 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:56:38,810 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:56:38,810 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:56:38,815 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:56:38,815 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:56:37" (1/3) ... [2021-11-23 02:56:38,816 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6414d7b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:38, skipping insertion in model container [2021-11-23 02:56:38,816 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:56:38" (2/3) ... [2021-11-23 02:56:38,817 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6414d7b8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:56:38, skipping insertion in model container [2021-11-23 02:56:38,817 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:56:38" (3/3) ... [2021-11-23 02:56:38,819 INFO L111 eAbstractionObserver]: Analyzing ICFG gcd_1+newton_2_8.i [2021-11-23 02:56:38,825 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:56:38,826 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 02:56:38,886 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:56:38,895 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:56:38,896 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 02:56:38,917 INFO L276 IsEmpty]: Start isEmpty. Operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 02:56:38,923 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:56:38,923 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:38,924 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:56:38,925 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:38,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:38,932 INFO L85 PathProgramCache]: Analyzing trace with hash -592026431, now seen corresponding path program 1 times [2021-11-23 02:56:38,944 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:38,945 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1325297642] [2021-11-23 02:56:38,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:38,946 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:39,086 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:56:39,088 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [50246020] [2021-11-23 02:56:39,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:39,088 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:39,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:39,091 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:39,098 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:56:39,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:39,202 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:56:39,211 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:39,424 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:39,424 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:56:39,425 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:39,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1325297642] [2021-11-23 02:56:39,426 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:56:39,426 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [50246020] [2021-11-23 02:56:39,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [50246020] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:56:39,428 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:56:39,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:56:39,431 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1009712678] [2021-11-23 02:56:39,433 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:56:39,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:56:39,439 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:39,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:56:39,483 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:39,485 INFO L87 Difference]: Start difference. First operand has 25 states, 16 states have (on average 1.4375) internal successors, (23), 18 states have internal predecessors, (23), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:39,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:39,542 INFO L93 Difference]: Finished difference Result 34 states and 41 transitions. [2021-11-23 02:56:39,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:56:39,546 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-23 02:56:39,546 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:39,553 INFO L225 Difference]: With dead ends: 34 [2021-11-23 02:56:39,554 INFO L226 Difference]: Without dead ends: 21 [2021-11-23 02:56:39,557 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:56:39,563 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 0 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:39,565 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:56:39,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-23 02:56:39,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2021-11-23 02:56:39,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 14 states have internal predecessors, (15), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 02:56:39,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2021-11-23 02:56:39,615 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 6 [2021-11-23 02:56:39,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:39,616 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2021-11-23 02:56:39,616 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:39,616 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2021-11-23 02:56:39,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:56:39,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:39,618 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:39,644 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-23 02:56:39,819 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-23 02:56:39,820 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:39,821 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:39,821 INFO L85 PathProgramCache]: Analyzing trace with hash -1175005777, now seen corresponding path program 1 times [2021-11-23 02:56:39,821 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:39,822 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [367826677] [2021-11-23 02:56:39,822 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:39,823 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:39,851 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:56:39,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [889044011] [2021-11-23 02:56:39,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:39,853 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:39,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:39,854 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:39,858 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:56:39,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:56:39,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-23 02:56:39,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:56:40,074 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:40,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:56:40,174 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:56:40,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:56:40,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [367826677] [2021-11-23 02:56:40,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 02:56:40,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [889044011] [2021-11-23 02:56:40,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [889044011] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:56:40,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1197047232] [2021-11-23 02:56:40,228 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:56:40,229 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:56:40,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:56:40,243 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:56:40,244 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:56:40,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:56:41,065 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '166#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:56:41,065 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:56:41,065 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:56:41,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 7 [2021-11-23 02:56:41,066 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327855323] [2021-11-23 02:56:41,066 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 02:56:41,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:56:41,068 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:56:41,068 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:56:41,069 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=106, Unknown=0, NotChecked=0, Total=132 [2021-11-23 02:56:41,069 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:41,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:56:41,163 INFO L93 Difference]: Finished difference Result 25 states and 27 transitions. [2021-11-23 02:56:41,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 02:56:41,164 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-23 02:56:41,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:56:41,165 INFO L225 Difference]: With dead ends: 25 [2021-11-23 02:56:41,165 INFO L226 Difference]: Without dead ends: 22 [2021-11-23 02:56:41,166 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=31, Invalid=125, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:56:41,168 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:56:41,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 85 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:56:41,170 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-23 02:56:41,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2021-11-23 02:56:41,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 15 states have internal predecessors, (16), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 02:56:41,177 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2021-11-23 02:56:41,177 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 7 [2021-11-23 02:56:41,177 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:56:41,177 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2021-11-23 02:56:41,178 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:56:41,178 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2021-11-23 02:56:41,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:56:41,180 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:56:41,181 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:56:41,229 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:56:41,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:41,407 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:56:41,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:56:41,408 INFO L85 PathProgramCache]: Analyzing trace with hash -2067496319, now seen corresponding path program 2 times [2021-11-23 02:56:41,408 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:56:41,408 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [470749216] [2021-11-23 02:56:41,409 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:56:41,409 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:56:41,420 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 02:56:41,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [634215415] [2021-11-23 02:56:41,425 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:56:41,425 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:56:41,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:56:41,431 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:56:41,466 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:56:52,076 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:56:52,076 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:56:52,084 WARN L261 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:56:52,086 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:58:46,530 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256)) (< |ULTIMATE.start_main1_~x~0#1| 0) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-23 02:59:56,156 WARN L838 $PredicateComparison]: unable to prove that (exists ((|ULTIMATE.start_main1_~y~0#1| Int) (|ULTIMATE.start_main1_~x~0#1| Int)) (and (< |ULTIMATE.start_main1_~x~0#1| 0) (= |c_ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (not (= (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |ULTIMATE.start_main1_~y~0#1|) 256) 0)) (< 0 |ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |ULTIMATE.start_main1_~y~0#1|) 0))) is different from false [2021-11-23 03:00:01,629 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2021-11-23 03:00:01,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:01:27,607 WARN L227 SmtUtils]: Spent 51.76s on a formula simplification that was a NOOP. DAG size: 120 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:01:49,759 WARN L860 $PredicateComparison]: unable to prove that (or (let ((.cse1 (mod (* |c_ULTIMATE.start_main1_~x~0#1| 255) 256))) (and (let ((.cse0 (mod (mod .cse1 |c_ULTIMATE.start_main1_~y~0#1|) 256))) (or (= .cse0 0) (< 127 .cse1) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| .cse0) 256) 0)))) (let ((.cse2 (mod (+ (- 256) .cse1) |c_ULTIMATE.start_main1_~y~0#1|))) (or (<= .cse1 127) (not (= (mod (mod |c_ULTIMATE.start_main1_~y~0#1| (+ (mod (+ (* |c_ULTIMATE.start_main1_~y~0#1| 255) .cse2) 256) (- 256))) 256) 0)) (= .cse2 0))))) (not (= (mod |c_ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)) (<= 0 |c_ULTIMATE.start_main1_~x~0#1|) (<= |c_ULTIMATE.start_main1_~y~0#1| 0)) is different from true [2021-11-23 03:03:09,480 WARN L838 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* |v_ULTIMATE.start_main1_~x~0#1_7| 255) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (= .cse0 0) (not (= (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256) 0)) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0))))) is different from false [2021-11-23 03:03:11,483 WARN L860 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_main1_~y~0#1_12| Int) (|v_ULTIMATE.start_main1_~x~0#1_7| Int)) (let ((.cse0 (mod (mod (mod (* |v_ULTIMATE.start_main1_~x~0#1_7| 255) 256) |v_ULTIMATE.start_main1_~y~0#1_12|) 256))) (or (<= 0 |v_ULTIMATE.start_main1_~x~0#1_7|) (< (+ 128 |v_ULTIMATE.start_main1_~x~0#1_7|) 0) (= .cse0 0) (not (= (mod (mod |v_ULTIMATE.start_main1_~y~0#1_12| .cse0) 256) 0)) (<= |v_ULTIMATE.start_main1_~y~0#1_12| 0) (not (= (mod |v_ULTIMATE.start_main1_~x~0#1_7| |v_ULTIMATE.start_main1_~y~0#1_12|) 0))))) is different from true [2021-11-23 03:03:11,484 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:03:11,484 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:03:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [470749216] [2021-11-23 03:03:11,484 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-23 03:03:11,484 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [634215415] [2021-11-23 03:03:11,484 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [634215415] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:03:11,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1780409718] [2021-11-23 03:03:11,487 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 03:03:11,487 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:03:11,487 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:03:11,487 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:03:11,487 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:03:13,654 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:03:19,933 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '293#(and (= |ULTIMATE.start_gcd_test_~b#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_main1_~y~0#1|) 1 0)) (<= 0 (+ |ULTIMATE.start_gcd_test_#res#1| 128)) (<= |ULTIMATE.start_gcd_test_#in~a#1| 127) (<= |ULTIMATE.start_main1_~x~0#1| 127) (<= |ULTIMATE.start_gcd_test_#in~b#1| 127) (<= 0 |ULTIMATE.start_main1_~y~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_gcd_test_#in~b#1|) (<= 0 (+ |ULTIMATE.start_gcd_test_#in~a#1| 128)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (<= |ULTIMATE.start_gcd_test_#res#1| 127) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main1_~g~0#1| |ULTIMATE.start_gcd_test_#res#1|) (= |ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_gcd_test_#res#1|) (<= |ULTIMATE.start_main1_~y~0#1| 127) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 03:03:19,933 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:03:19,933 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:03:19,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-11-23 03:03:19,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282665726] [2021-11-23 03:03:19,934 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-23 03:03:19,934 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-23 03:03:19,935 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:03:19,935 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-23 03:03:19,935 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=143, Unknown=10, NotChecked=108, Total=306 [2021-11-23 03:03:19,936 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:04:25,303 WARN L227 SmtUtils]: Spent 45.27s on a formula simplification. DAG size of input: 43 DAG size of output: 27 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:04:27,375 WARN L838 $PredicateComparison]: unable to prove that (let ((.cse32 (mod |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_gcd_test_~b#1|))) (let ((.cse33 (mod (+ |c_ULTIMATE.start_gcd_test_~b#1| .cse32) 256))) (let ((.cse21 (+ 256 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse34 (mod (+ (* |c_ULTIMATE.start_gcd_test_~b#1| 255) .cse32) 256)) (.cse9 (<= 0 |c_ULTIMATE.start_gcd_test_~a#1|)) (.cse29 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse33) 256) 0))) (.cse30 (= |c_ULTIMATE.start_main1_~y~0#1| .cse33)) (.cse31 (= .cse33 0))) (let ((.cse20 (or .cse9 .cse29 .cse30 .cse31)) (.cse8 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse34) 256) 0))) (.cse10 (= .cse34 0)) (.cse11 (= .cse34 |c_ULTIMATE.start_main1_~y~0#1|)) (.cse12 (< 127 .cse34)) (.cse13 (<= .cse34 127)) (.cse1 (<= .cse33 127)) (.cse5 (< 127 .cse33)) (.cse6 (< |c_ULTIMATE.start_gcd_test_~b#1| 0)) (.cse15 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse34)) 256) 0))) (.cse16 (= .cse34 .cse21)) (.cse19 (<= 0 |c_ULTIMATE.start_gcd_test_~b#1|)) (.cse17 (= .cse21 .cse33)) (.cse18 (not (= 0 (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse33)) 256)))) (.cse23 (< |c_ULTIMATE.start_gcd_test_~a#1| 0)) (.cse22 (mod .cse32 256))) (and (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (or (and (< |ULTIMATE.start_main1_~x~0#1| 0) (let ((.cse0 (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256))) (or (and (<= .cse0 127) (= |c_ULTIMATE.start_gcd_test_~a#1| .cse0)) (and (= (+ |c_ULTIMATE.start_gcd_test_~a#1| 256) .cse0) (< 127 .cse0))))) (and (= |c_ULTIMATE.start_gcd_test_~a#1| |ULTIMATE.start_main1_~x~0#1|) (<= 0 |ULTIMATE.start_main1_~x~0#1|))) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0))) (= |c_ULTIMATE.start_gcd_test_~b#1| |c_ULTIMATE.start_main1_~y~0#1|) (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (<= 0 (+ |c_ULTIMATE.start_main1_~x~0#1| 128)) (or (let ((.cse7 (or (= .cse21 .cse22) .cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| (+ (- 256) .cse22)) 256) 0))))) (let ((.cse4 (or (and .cse7 .cse20) .cse19)) (.cse3 (or (and .cse7 (or .cse9 .cse17 .cse18)) .cse19))) (and (or (let ((.cse2 (or .cse6 (and .cse7 (or .cse8 .cse9 .cse10 .cse11))))) (and (or .cse1 (and .cse2 .cse3)) (or (and .cse2 .cse4) .cse5))) .cse12) (or .cse13 (let ((.cse14 (or .cse6 (and .cse7 (or .cse9 .cse15 .cse16))))) (and (or (and .cse14 .cse4) .cse5) (or .cse1 (and .cse3 .cse14)))))))) (<= .cse22 127)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (or (< 127 .cse22) (let ((.cse26 (or .cse23 (not (= (mod (mod |c_ULTIMATE.start_gcd_test_~b#1| .cse22) 256) 0)) (= |c_ULTIMATE.start_main1_~y~0#1| .cse22) (= 0 .cse22))) (.cse27 (= .cse32 0))) (let ((.cse24 (or .cse19 (and .cse26 (or .cse9 .cse17 .cse18 .cse27))))) (and (or (let ((.cse25 (or .cse6 (and .cse26 (or .cse8 .cse9 .cse10 .cse11 .cse27))))) (and (or .cse1 (and .cse24 .cse25)) (or (and (or (and .cse26 .cse20) .cse19) .cse25) .cse5))) .cse12) (or .cse13 (let ((.cse28 (or .cse6 (and (or .cse9 .cse15 .cse16 .cse27) .cse26)))) (and (or .cse1 (and .cse28 .cse24)) (or (and (or .cse19 (and (or .cse9 .cse29 .cse30 .cse31 .cse27) .cse26)) .cse28) .cse5))))))))))))) is different from false [2021-11-23 03:05:07,984 WARN L227 SmtUtils]: Spent 35.23s on a formula simplification. DAG size of input: 50 DAG size of output: 46 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-23 03:05:10,342 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 |c_ULTIMATE.start_main1_~y~0#1|) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |c_ULTIMATE.start_main1_~y~0#1| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (or (< 127 |c_ULTIMATE.start_gcd_test_~a#1|) (not (= |c_ULTIMATE.start_gcd_test_~b#1| 0)) (< (+ |c_ULTIMATE.start_gcd_test_~a#1| 128) 0) (= |c_ULTIMATE.start_gcd_test_~a#1| |c_ULTIMATE.start_main1_~y~0#1|)) (<= |c_ULTIMATE.start_main1_~y~0#1| 127) (exists ((|ULTIMATE.start_main1_~x~0#1| Int)) (and (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |c_ULTIMATE.start_main1_~y~0#1|) 256)) (< |ULTIMATE.start_main1_~x~0#1| 0) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= (mod |ULTIMATE.start_main1_~x~0#1| |c_ULTIMATE.start_main1_~y~0#1|) 0)))) is different from false [2021-11-23 03:05:10,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:05:10,463 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2021-11-23 03:05:10,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:05:10,464 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 03:05:10,465 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:05:10,465 INFO L225 Difference]: With dead ends: 26 [2021-11-23 03:05:10,465 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 03:05:10,466 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 6 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 190.1s TimeCoverageRelationStatistics Valid=57, Invalid=187, Unknown=20, NotChecked=198, Total=462 [2021-11-23 03:05:10,469 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 134 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 54 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:05:10,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 21 Invalid, 0 Unknown, 54 Unchecked, 1.1s Time] [2021-11-23 03:05:10,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 03:05:10,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 03:05:10,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 16 states have internal predecessors, (17), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:05:10,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-23 03:05:10,475 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 8 [2021-11-23 03:05:10,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:05:10,475 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-23 03:05:10,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:05:10,476 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-23 03:05:10,476 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 03:05:10,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:05:10,477 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2021-11-23 03:05:10,492 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:05:10,684 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:10,685 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION, ULTIMATE.startErr1ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:05:10,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:05:10,686 INFO L85 PathProgramCache]: Analyzing trace with hash 330067951, now seen corresponding path program 3 times [2021-11-23 03:05:10,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:05:10,686 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871142162] [2021-11-23 03:05:10,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:05:10,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:05:10,708 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-23 03:05:10,709 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1177923627] [2021-11-23 03:05:10,709 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:05:10,709 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:05:10,710 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:05:10,711 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:05:10,718 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_445a1673-a0a7-4167-98c5-b1dfd39085bf/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:05:21,704 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:05:21,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:05:21,710 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-23 03:05:21,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:21,524 WARN L838 $PredicateComparison]: unable to prove that (and (exists ((|ULTIMATE.start_main1_~x~0#1| Int) (|v_ULTIMATE.start_gcd_test_~a#1_33| Int)) (and (< |ULTIMATE.start_main1_~x~0#1| 0) (= |c_ULTIMATE.start_gcd_test_~a#1| (mod (mod (mod (* |ULTIMATE.start_main1_~x~0#1| 255) 256) |v_ULTIMATE.start_gcd_test_~a#1_33|) 256)) (<= 0 (+ |ULTIMATE.start_main1_~x~0#1| 128)) (= |c_ULTIMATE.start_gcd_test_~b#1| (mod (mod |v_ULTIMATE.start_gcd_test_~a#1_33| |c_ULTIMATE.start_gcd_test_~a#1|) 256)) (< 0 |v_ULTIMATE.start_gcd_test_~a#1_33|) (= (mod |ULTIMATE.start_main1_~x~0#1| |v_ULTIMATE.start_gcd_test_~a#1_33|) 0))) (not (= |c_ULTIMATE.start_gcd_test_~a#1| 0))) is different from false