./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 69874e26 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer --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 Automizer --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 992b306a3a5a9eaa476c1e842c528615cb39ce06 ....................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-69874e2 [2020-12-01 14:54:42,290 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-01 14:54:42,300 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-01 14:54:42,369 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-01 14:54:42,369 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-01 14:54:42,371 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-01 14:54:42,373 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-01 14:54:42,375 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-01 14:54:42,378 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-01 14:54:42,379 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-01 14:54:42,381 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-01 14:54:42,382 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-01 14:54:42,383 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-01 14:54:42,385 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-01 14:54:42,386 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-01 14:54:42,388 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-01 14:54:42,389 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-01 14:54:42,391 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-01 14:54:42,393 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-01 14:54:42,396 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-01 14:54:42,399 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-01 14:54:42,401 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-01 14:54:42,403 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-01 14:54:42,404 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-01 14:54:42,408 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-01 14:54:42,409 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-01 14:54:42,409 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-01 14:54:42,410 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-01 14:54:42,411 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-01 14:54:42,412 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-01 14:54:42,413 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-01 14:54:42,414 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-01 14:54:42,415 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-01 14:54:42,416 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-01 14:54:42,418 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-01 14:54:42,418 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-01 14:54:42,419 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-01 14:54:42,420 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-01 14:54:42,420 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-01 14:54:42,422 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-01 14:54:42,423 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-01 14:54:42,424 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-12-01 14:54:42,447 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-01 14:54:42,447 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-01 14:54:42,449 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-12-01 14:54:42,449 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-12-01 14:54:42,450 INFO L138 SettingsManager]: * Use SBE=true [2020-12-01 14:54:42,450 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-01 14:54:42,451 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-01 14:54:42,451 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-01 14:54:42,452 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-01 14:54:42,452 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-01 14:54:42,453 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-01 14:54:42,453 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-01 14:54:42,453 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-01 14:54:42,453 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-01 14:54:42,454 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-01 14:54:42,454 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-01 14:54:42,454 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-01 14:54:42,454 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-01 14:54:42,455 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-12-01 14:54:42,455 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-12-01 14:54:42,455 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-01 14:54:42,455 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-01 14:54:42,456 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-01 14:54:42,456 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-01 14:54:42,456 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-01 14:54:42,457 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-12-01 14:54:42,457 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-01 14:54:42,457 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-01 14:54:42,457 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-01 14:54:42,458 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 992b306a3a5a9eaa476c1e842c528615cb39ce06 [2020-12-01 14:54:42,711 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-01 14:54:42,758 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-01 14:54:42,762 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-01 14:54:42,763 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-01 14:54:42,765 INFO L275 PluginConnector]: CDTParser initialized [2020-12-01 14:54:42,767 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.c [2020-12-01 14:54:42,857 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/data/59b2c82c7/03a4d6f761b44fd3ae654fbe98b79add/FLAGb0a14535a [2020-12-01 14:54:43,267 INFO L306 CDTParser]: Found 1 translation units. [2020-12-01 14:54:43,267 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/sv-benchmarks/c/loop-acceleration/underapprox_1-2.c [2020-12-01 14:54:43,273 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/data/59b2c82c7/03a4d6f761b44fd3ae654fbe98b79add/FLAGb0a14535a [2020-12-01 14:54:43,662 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/data/59b2c82c7/03a4d6f761b44fd3ae654fbe98b79add [2020-12-01 14:54:43,664 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-01 14:54:43,666 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-01 14:54:43,667 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-01 14:54:43,667 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-01 14:54:43,671 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-01 14:54:43,671 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,673 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@73c4f3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43, skipping insertion in model container [2020-12-01 14:54:43,674 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,681 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-01 14:54:43,693 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-01 14:54:43,856 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 14:54:43,870 INFO L203 MainTranslator]: Completed pre-run [2020-12-01 14:54:43,889 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-01 14:54:43,902 INFO L208 MainTranslator]: Completed translation [2020-12-01 14:54:43,902 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43 WrapperNode [2020-12-01 14:54:43,903 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-01 14:54:43,904 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-01 14:54:43,904 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-01 14:54:43,904 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-01 14:54:43,914 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,925 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,949 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-01 14:54:43,952 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-01 14:54:43,953 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-01 14:54:43,953 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-01 14:54:43,968 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,969 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,983 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,983 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,986 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,996 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:43,999 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... [2020-12-01 14:54:44,001 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-01 14:54:44,003 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-01 14:54:44,003 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-01 14:54:44,003 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-01 14:54:44,005 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-01 14:54:44,098 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-01 14:54:44,098 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-01 14:54:44,099 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-01 14:54:44,100 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-01 14:54:44,344 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-01 14:54:44,345 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-12-01 14:54:44,346 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:54:44 BoogieIcfgContainer [2020-12-01 14:54:44,346 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-01 14:54:44,358 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-01 14:54:44,373 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-01 14:54:44,377 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-01 14:54:44,377 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 01.12 02:54:43" (1/3) ... [2020-12-01 14:54:44,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@705d2862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.12 02:54:44, skipping insertion in model container [2020-12-01 14:54:44,378 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 01.12 02:54:43" (2/3) ... [2020-12-01 14:54:44,378 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@705d2862 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 01.12 02:54:44, skipping insertion in model container [2020-12-01 14:54:44,379 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:54:44" (3/3) ... [2020-12-01 14:54:44,380 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2020-12-01 14:54:44,394 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-01 14:54:44,412 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-01 14:54:44,422 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-01 14:54:44,458 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-01 14:54:44,459 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-01 14:54:44,459 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-01 14:54:44,459 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-01 14:54:44,459 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-01 14:54:44,459 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-01 14:54:44,460 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-01 14:54:44,460 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-01 14:54:44,472 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2020-12-01 14:54:44,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-01 14:54:44,477 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:44,478 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-01 14:54:44,478 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:44,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:44,484 INFO L82 PathProgramCache]: Analyzing trace with hash 889633835, now seen corresponding path program 1 times [2020-12-01 14:54:44,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:44,493 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1055498384] [2020-12-01 14:54:44,493 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:44,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:44,660 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:44,661 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1055498384] [2020-12-01 14:54:44,662 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-01 14:54:44,662 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-01 14:54:44,663 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507347940] [2020-12-01 14:54:44,667 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-01 14:54:44,668 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:44,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-01 14:54:44,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-01 14:54:44,684 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 3 states. [2020-12-01 14:54:44,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:44,705 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2020-12-01 14:54:44,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-01 14:54:44,707 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-01 14:54:44,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:44,715 INFO L225 Difference]: With dead ends: 19 [2020-12-01 14:54:44,715 INFO L226 Difference]: Without dead ends: 8 [2020-12-01 14:54:44,718 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-01 14:54:44,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-01 14:54:44,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-01 14:54:44,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-01 14:54:44,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-12-01 14:54:44,773 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 6 [2020-12-01 14:54:44,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:44,773 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-12-01 14:54:44,774 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-01 14:54:44,774 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-12-01 14:54:44,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-01 14:54:44,775 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:44,775 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:44,775 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-01 14:54:44,781 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:44,782 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:44,783 INFO L82 PathProgramCache]: Analyzing trace with hash 1810510480, now seen corresponding path program 1 times [2020-12-01 14:54:44,783 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:44,783 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [944965602] [2020-12-01 14:54:44,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:44,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:44,891 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:44,892 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [944965602] [2020-12-01 14:54:44,892 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1374229086] [2020-12-01 14:54:44,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:44,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:44,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-01 14:54:44,956 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:45,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:45,001 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:45,001 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-12-01 14:54:45,002 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483378849] [2020-12-01 14:54:45,003 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-12-01 14:54:45,004 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:45,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-12-01 14:54:45,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-01 14:54:45,005 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 5 states. [2020-12-01 14:54:45,023 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:45,024 INFO L93 Difference]: Finished difference Result 13 states and 13 transitions. [2020-12-01 14:54:45,024 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-12-01 14:54:45,025 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2020-12-01 14:54:45,025 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:45,025 INFO L225 Difference]: With dead ends: 13 [2020-12-01 14:54:45,025 INFO L226 Difference]: Without dead ends: 9 [2020-12-01 14:54:45,027 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-01 14:54:45,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-01 14:54:45,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-01 14:54:45,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-01 14:54:45,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-01 14:54:45,030 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 7 [2020-12-01 14:54:45,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:45,031 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-01 14:54:45,031 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-12-01 14:54:45,031 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-01 14:54:45,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-01 14:54:45,032 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:45,032 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:45,256 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-01 14:54:45,256 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:45,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:45,258 INFO L82 PathProgramCache]: Analyzing trace with hash 292915403, now seen corresponding path program 2 times [2020-12-01 14:54:45,258 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:45,259 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [416796446] [2020-12-01 14:54:45,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:45,313 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:45,417 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:45,417 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [416796446] [2020-12-01 14:54:45,418 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1809971833] [2020-12-01 14:54:45,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:45,467 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-12-01 14:54:45,467 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 14:54:45,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 7 conjunts are in the unsatisfiable core [2020-12-01 14:54:45,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:45,543 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:45,544 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:45,544 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-12-01 14:54:45,545 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [317859434] [2020-12-01 14:54:45,546 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-12-01 14:54:45,547 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:45,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-12-01 14:54:45,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-01 14:54:45,551 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 6 states. [2020-12-01 14:54:45,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:45,589 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-12-01 14:54:45,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-01 14:54:45,590 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 8 [2020-12-01 14:54:45,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:45,591 INFO L225 Difference]: With dead ends: 14 [2020-12-01 14:54:45,591 INFO L226 Difference]: Without dead ends: 10 [2020-12-01 14:54:45,592 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-12-01 14:54:45,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2020-12-01 14:54:45,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2020-12-01 14:54:45,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-12-01 14:54:45,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-12-01 14:54:45,597 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 8 [2020-12-01 14:54:45,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:45,599 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-12-01 14:54:45,599 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-12-01 14:54:45,599 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-12-01 14:54:45,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-12-01 14:54:45,600 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:45,600 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:45,809 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:45,809 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:45,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:45,810 INFO L82 PathProgramCache]: Analyzing trace with hash 492108272, now seen corresponding path program 3 times [2020-12-01 14:54:45,810 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:45,811 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1449971472] [2020-12-01 14:54:45,811 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:45,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:45,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:45,918 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1449971472] [2020-12-01 14:54:45,919 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [916098640] [2020-12-01 14:54:45,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:45,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-01 14:54:45,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 14:54:45,970 INFO L263 TraceCheckSpWp]: Trace formula consists of 58 conjuncts, 9 conjunts are in the unsatisfiable core [2020-12-01 14:54:45,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:46,018 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:46,018 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:46,018 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-12-01 14:54:46,019 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480955646] [2020-12-01 14:54:46,019 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-01 14:54:46,019 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:46,020 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-01 14:54:46,020 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-01 14:54:46,021 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 7 states. [2020-12-01 14:54:46,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:46,048 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2020-12-01 14:54:46,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-01 14:54:46,049 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 9 [2020-12-01 14:54:46,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:46,050 INFO L225 Difference]: With dead ends: 15 [2020-12-01 14:54:46,050 INFO L226 Difference]: Without dead ends: 11 [2020-12-01 14:54:46,051 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 8 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2020-12-01 14:54:46,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-01 14:54:46,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-01 14:54:46,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-01 14:54:46,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-01 14:54:46,054 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 9 [2020-12-01 14:54:46,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:46,054 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-01 14:54:46,055 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-01 14:54:46,055 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-01 14:54:46,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-01 14:54:46,055 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:46,056 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:46,281 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:46,281 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:46,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:46,282 INFO L82 PathProgramCache]: Analyzing trace with hash -1922847381, now seen corresponding path program 4 times [2020-12-01 14:54:46,282 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:46,283 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [101111799] [2020-12-01 14:54:46,283 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:46,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:46,451 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:46,452 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [101111799] [2020-12-01 14:54:46,452 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288223797] [2020-12-01 14:54:46,452 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:46,505 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-01 14:54:46,505 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 14:54:46,506 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-01 14:54:46,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:46,587 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:46,587 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:46,587 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-12-01 14:54:46,588 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [636102962] [2020-12-01 14:54:46,588 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-12-01 14:54:46,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:46,589 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-12-01 14:54:46,590 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-01 14:54:46,590 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 8 states. [2020-12-01 14:54:46,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:46,640 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-12-01 14:54:46,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-12-01 14:54:46,641 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 10 [2020-12-01 14:54:46,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:46,642 INFO L225 Difference]: With dead ends: 16 [2020-12-01 14:54:46,642 INFO L226 Difference]: Without dead ends: 12 [2020-12-01 14:54:46,643 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 9 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2020-12-01 14:54:46,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-12-01 14:54:46,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-12-01 14:54:46,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-12-01 14:54:46,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-12-01 14:54:46,651 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-12-01 14:54:46,655 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:46,655 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-12-01 14:54:46,655 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-12-01 14:54:46,655 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-12-01 14:54:46,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-12-01 14:54:46,656 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:46,656 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:46,861 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:46,861 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:46,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:46,862 INFO L82 PathProgramCache]: Analyzing trace with hash 522938704, now seen corresponding path program 5 times [2020-12-01 14:54:46,862 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:46,862 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821521874] [2020-12-01 14:54:46,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:46,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:47,024 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:47,025 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821521874] [2020-12-01 14:54:47,025 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2089890483] [2020-12-01 14:54:47,025 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:47,076 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 4 check-sat command(s) [2020-12-01 14:54:47,077 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 14:54:47,078 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-01 14:54:47,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:47,189 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:47,193 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:47,193 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-12-01 14:54:47,193 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2562232] [2020-12-01 14:54:47,194 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-01 14:54:47,194 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:47,194 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-01 14:54:47,195 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-01 14:54:47,195 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 9 states. [2020-12-01 14:54:47,261 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:47,261 INFO L93 Difference]: Finished difference Result 17 states and 17 transitions. [2020-12-01 14:54:47,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-01 14:54:47,262 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 11 [2020-12-01 14:54:47,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:47,264 INFO L225 Difference]: With dead ends: 17 [2020-12-01 14:54:47,264 INFO L226 Difference]: Without dead ends: 13 [2020-12-01 14:54:47,265 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 7 SyntacticMatches, 4 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-12-01 14:54:47,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-12-01 14:54:47,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2020-12-01 14:54:47,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-12-01 14:54:47,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 13 transitions. [2020-12-01 14:54:47,269 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 13 transitions. Word has length 11 [2020-12-01 14:54:47,270 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:47,270 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 13 transitions. [2020-12-01 14:54:47,270 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-01 14:54:47,270 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 13 transitions. [2020-12-01 14:54:47,272 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-12-01 14:54:47,272 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:47,272 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:47,490 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-12-01 14:54:47,491 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:47,491 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:47,491 INFO L82 PathProgramCache]: Analyzing trace with hash -967103989, now seen corresponding path program 6 times [2020-12-01 14:54:47,492 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:47,492 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257490180] [2020-12-01 14:54:47,492 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:47,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:48,039 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:48,039 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257490180] [2020-12-01 14:54:48,040 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840509202] [2020-12-01 14:54:48,040 INFO L93 rtionOrderModulation]: Changing assertion order to MIX_INSIDE_OUTSIDE No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:48,132 INFO L228 tOrderPrioritization]: Assert order MIX_INSIDE_OUTSIDE issued 4 check-sat command(s) [2020-12-01 14:54:48,132 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-01 14:54:48,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 25 conjunts are in the unsatisfiable core [2020-12-01 14:54:48,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:48,415 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-01 14:54:48,416 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:48,416 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 18 [2020-12-01 14:54:48,416 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1330995702] [2020-12-01 14:54:48,416 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-01 14:54:48,417 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:48,417 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-01 14:54:48,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-12-01 14:54:48,418 INFO L87 Difference]: Start difference. First operand 13 states and 13 transitions. Second operand 18 states. [2020-12-01 14:54:48,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:48,586 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2020-12-01 14:54:48,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-12-01 14:54:48,587 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 12 [2020-12-01 14:54:48,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:48,587 INFO L225 Difference]: With dead ends: 21 [2020-12-01 14:54:48,588 INFO L226 Difference]: Without dead ends: 15 [2020-12-01 14:54:48,588 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=60, Invalid=320, Unknown=0, NotChecked=0, Total=380 [2020-12-01 14:54:48,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-12-01 14:54:48,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-12-01 14:54:48,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-12-01 14:54:48,591 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-12-01 14:54:48,592 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-12-01 14:54:48,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:48,592 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-12-01 14:54:48,592 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-01 14:54:48,592 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-12-01 14:54:48,593 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-12-01 14:54:48,593 INFO L414 BasicCegarLoop]: Found error trace [2020-12-01 14:54:48,593 INFO L422 BasicCegarLoop]: trace histogram [8, 1, 1, 1, 1, 1, 1] [2020-12-01 14:54:48,804 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:48,804 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-01 14:54:48,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-01 14:54:48,804 INFO L82 PathProgramCache]: Analyzing trace with hash -1620705621, now seen corresponding path program 7 times [2020-12-01 14:54:48,805 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-12-01 14:54:48,805 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [131268516] [2020-12-01 14:54:48,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-01 14:54:48,838 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:48,962 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-01 14:54:48,962 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [131268516] [2020-12-01 14:54:48,963 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2025294290] [2020-12-01 14:54:48,963 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:49,012 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-01 14:54:49,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 17 conjunts are in the unsatisfiable core [2020-12-01 14:54:49,015 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-01 14:54:49,108 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 14 proven. 21 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-12-01 14:54:49,109 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-12-01 14:54:49,109 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 10 [2020-12-01 14:54:49,109 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83445781] [2020-12-01 14:54:49,110 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-12-01 14:54:49,111 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-12-01 14:54:49,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-12-01 14:54:49,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-12-01 14:54:49,114 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 10 states. [2020-12-01 14:54:49,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-01 14:54:49,163 INFO L93 Difference]: Finished difference Result 15 states and 15 transitions. [2020-12-01 14:54:49,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-12-01 14:54:49,164 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 14 [2020-12-01 14:54:49,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-01 14:54:49,164 INFO L225 Difference]: With dead ends: 15 [2020-12-01 14:54:49,164 INFO L226 Difference]: Without dead ends: 0 [2020-12-01 14:54:49,165 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 3 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-12-01 14:54:49,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-01 14:54:49,166 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-01 14:54:49,166 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-01 14:54:49,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-01 14:54:49,166 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 14 [2020-12-01 14:54:49,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-01 14:54:49,166 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-01 14:54:49,166 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-12-01 14:54:49,167 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-01 14:54:49,167 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-01 14:54:49,391 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-01 14:54:49,392 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point L3(line 3) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point L-1(line -1) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-12-01 14:54:49,506 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-12-01 14:54:49,507 INFO L258 CegarLoopResult]: At program point L16-2(lines 16 19) the Hoare annotation is: (or (and (= ULTIMATE.start_main_~x~0 0) (= ULTIMATE.start_main_~y~0 1)) (and (<= 3 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 8) (<= ULTIMATE.start_main_~x~0 3)) (and (= ULTIMATE.start_main_~x~0 1) (= ULTIMATE.start_main_~y~0 2)) (and (<= 2 ULTIMATE.start_main_~x~0) (<= ULTIMATE.start_main_~x~0 2) (= ULTIMATE.start_main_~y~0 4)) (and (<= 5 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 32) (<= ULTIMATE.start_main_~x~0 5)) (and (<= 4 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 16) (<= ULTIMATE.start_main_~x~0 4)) (and (<= ULTIMATE.start_main_~x~0 6) (<= 6 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 64))) [2020-12-01 14:54:49,507 INFO L262 CegarLoopResult]: For program point L16-3(lines 16 19) no Hoare annotation was computed. [2020-12-01 14:54:49,507 INFO L262 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2020-12-01 14:54:49,507 INFO L265 CegarLoopResult]: At program point L6-2(lines 1 22) the Hoare annotation is: true [2020-12-01 14:54:49,531 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 01.12 02:54:49 BoogieIcfgContainer [2020-12-01 14:54:49,531 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-01 14:54:49,533 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-01 14:54:49,533 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-01 14:54:49,533 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-01 14:54:49,534 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 01.12 02:54:44" (3/4) ... [2020-12-01 14:54:49,537 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-01 14:54:49,547 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2020-12-01 14:54:49,549 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-12-01 14:54:49,549 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-01 14:54:49,549 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-01 14:54:49,600 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_22b3147c-4a7d-4731-841b-637275332fd7/bin/uautomizer/witness.graphml [2020-12-01 14:54:49,602 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-01 14:54:49,604 INFO L168 Benchmark]: Toolchain (without parser) took 5937.00 ms. Allocated memory was 88.1 MB in the beginning and 109.1 MB in the end (delta: 21.0 MB). Free memory was 56.2 MB in the beginning and 46.0 MB in the end (delta: 10.3 MB). Peak memory consumption was 30.9 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,605 INFO L168 Benchmark]: CDTParser took 0.34 ms. Allocated memory is still 88.1 MB. Free memory was 44.9 MB in the beginning and 44.9 MB in the end (delta: 39.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 14:54:49,606 INFO L168 Benchmark]: CACSL2BoogieTranslator took 235.97 ms. Allocated memory is still 88.1 MB. Free memory was 56.1 MB in the beginning and 65.5 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,606 INFO L168 Benchmark]: Boogie Procedure Inliner took 45.35 ms. Allocated memory is still 88.1 MB. Free memory was 65.5 MB in the beginning and 64.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-01 14:54:49,607 INFO L168 Benchmark]: Boogie Preprocessor took 50.18 ms. Allocated memory is still 88.1 MB. Free memory was 64.2 MB in the beginning and 63.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,610 INFO L168 Benchmark]: RCFGBuilder took 343.73 ms. Allocated memory is still 88.1 MB. Free memory was 63.1 MB in the beginning and 52.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,613 INFO L168 Benchmark]: TraceAbstraction took 5173.60 ms. Allocated memory was 88.1 MB in the beginning and 109.1 MB in the end (delta: 21.0 MB). Free memory was 52.3 MB in the beginning and 48.1 MB in the end (delta: 4.3 MB). Peak memory consumption was 27.7 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,615 INFO L168 Benchmark]: Witness Printer took 69.08 ms. Allocated memory is still 109.1 MB. Free memory was 48.1 MB in the beginning and 46.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-01 14:54:49,617 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.34 ms. Allocated memory is still 88.1 MB. Free memory was 44.9 MB in the beginning and 44.9 MB in the end (delta: 39.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 235.97 ms. Allocated memory is still 88.1 MB. Free memory was 56.1 MB in the beginning and 65.5 MB in the end (delta: -9.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 45.35 ms. Allocated memory is still 88.1 MB. Free memory was 65.5 MB in the beginning and 64.2 MB in the end (delta: 1.4 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 50.18 ms. Allocated memory is still 88.1 MB. Free memory was 64.2 MB in the beginning and 63.1 MB in the end (delta: 1.0 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 343.73 ms. Allocated memory is still 88.1 MB. Free memory was 63.1 MB in the beginning and 52.7 MB in the end (delta: 10.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * TraceAbstraction took 5173.60 ms. Allocated memory was 88.1 MB in the beginning and 109.1 MB in the end (delta: 21.0 MB). Free memory was 52.3 MB in the beginning and 48.1 MB in the end (delta: 4.3 MB). Peak memory consumption was 27.7 MB. Max. memory is 16.1 GB. * Witness Printer took 69.08 ms. Allocated memory is still 109.1 MB. Free memory was 48.1 MB in the beginning and 46.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: ((((((x == 0 && y == 1) || ((3 <= x && y == 8) && x <= 3)) || (x == 1 && y == 2)) || ((2 <= x && x <= 2) && y == 4)) || ((5 <= x && y == 32) && x <= 5)) || ((4 <= x && y == 16) && x <= 4)) || ((x <= 6 && 6 <= x) && y == 64) - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 4.9s, OverallIterations: 8, TraceHistogramMax: 8, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 46 SDtfs, 3 SDslu, 139 SDs, 0 SdLazy, 275 SolverSat, 22 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 118 GetRequests, 56 SyntacticMatches, 10 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 1.2s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=15occurred in iteration=7, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 8 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 10 NumberOfFragments, 66 HoareAnnotationTreeSize, 2 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 6 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.4s SatisfiabilityAnalysisTime, 1.9s InterpolantComputationTime, 148 NumberOfCodeBlocks, 148 NumberOfCodeBlocksAsserted, 25 NumberOfCheckSat, 133 ConstructedInterpolants, 0 QuantifiedInterpolants, 6158 SizeOfPredicates, 7 NumberOfNonLiveVariables, 446 ConjunctsInSsa, 91 ConjunctsInUnsatCore, 15 InterpolantComputations, 1 PerfectInterpolantSequences, 30/184 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...