./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_1b.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/config/AutomizerReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 c1836be5ce35667bc02ed393f2cbc8396b48b5bb .................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-28 03:16:35,601 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-28 03:16:35,603 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-28 03:16:35,652 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-28 03:16:35,655 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-28 03:16:35,657 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-28 03:16:35,659 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-28 03:16:35,662 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-28 03:16:35,693 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-28 03:16:35,694 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-28 03:16:35,695 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-28 03:16:35,697 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-28 03:16:35,698 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-28 03:16:35,699 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-28 03:16:35,702 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-28 03:16:35,705 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-28 03:16:35,707 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-28 03:16:35,713 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-28 03:16:35,722 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-28 03:16:35,727 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-28 03:16:35,733 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-28 03:16:35,736 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-28 03:16:35,738 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-28 03:16:35,740 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-28 03:16:35,750 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-28 03:16:35,751 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-28 03:16:35,751 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-28 03:16:35,754 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-28 03:16:35,754 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-28 03:16:35,756 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-28 03:16:35,757 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-28 03:16:35,758 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-28 03:16:35,761 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-28 03:16:35,762 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-28 03:16:35,764 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-28 03:16:35,764 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-28 03:16:35,765 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-28 03:16:35,765 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-28 03:16:35,766 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-28 03:16:35,767 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-28 03:16:35,769 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-28 03:16:35,773 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/config/svcomp-Reach-32bit-Automizer_Default.epf [2020-11-28 03:16:35,822 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-28 03:16:35,822 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-28 03:16:35,825 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-11-28 03:16:35,826 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-11-28 03:16:35,826 INFO L138 SettingsManager]: * Use SBE=true [2020-11-28 03:16:35,826 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-28 03:16:35,827 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-28 03:16:35,827 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-28 03:16:35,827 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-28 03:16:35,828 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-28 03:16:35,829 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-28 03:16:35,829 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-28 03:16:35,830 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-28 03:16:35,830 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-28 03:16:35,830 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-28 03:16:35,830 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-28 03:16:35,831 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-28 03:16:35,831 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-28 03:16:35,831 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-11-28 03:16:35,831 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-28 03:16:35,832 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-28 03:16:35,832 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-28 03:16:35,832 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-28 03:16:35,833 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-28 03:16:35,833 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-28 03:16:35,833 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-11-28 03:16:35,834 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-28 03:16:35,834 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-28 03:16:35,834 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-28 03:16:35,834 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_99983948-5da6-49d6-9665-c1a9142c1495/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Automizer Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c1836be5ce35667bc02ed393f2cbc8396b48b5bb [2020-11-28 03:16:36,135 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-28 03:16:36,171 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-28 03:16:36,177 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-28 03:16:36,179 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-28 03:16:36,180 INFO L275 PluginConnector]: CDTParser initialized [2020-11-28 03:16:36,182 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/../../sv-benchmarks/c/loop-simple/nested_1b.c [2020-11-28 03:16:36,262 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/data/9386ee792/c9db94ade2da4dc4be3be9836714354f/FLAG2ad083eb6 [2020-11-28 03:16:36,855 INFO L306 CDTParser]: Found 1 translation units. [2020-11-28 03:16:36,857 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/sv-benchmarks/c/loop-simple/nested_1b.c [2020-11-28 03:16:36,875 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/data/9386ee792/c9db94ade2da4dc4be3be9836714354f/FLAG2ad083eb6 [2020-11-28 03:16:37,216 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/data/9386ee792/c9db94ade2da4dc4be3be9836714354f [2020-11-28 03:16:37,219 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-28 03:16:37,221 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-28 03:16:37,224 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-28 03:16:37,224 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-28 03:16:37,227 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-28 03:16:37,228 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,230 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22638c17 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37, skipping insertion in model container [2020-11-28 03:16:37,231 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,239 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-28 03:16:37,252 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-28 03:16:37,438 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:16:37,455 INFO L203 MainTranslator]: Completed pre-run [2020-11-28 03:16:37,480 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-28 03:16:37,498 INFO L208 MainTranslator]: Completed translation [2020-11-28 03:16:37,501 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37 WrapperNode [2020-11-28 03:16:37,501 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-28 03:16:37,503 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-28 03:16:37,503 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-28 03:16:37,503 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-28 03:16:37,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,527 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,549 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-28 03:16:37,553 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-28 03:16:37,554 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-28 03:16:37,555 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-28 03:16:37,565 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,565 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,567 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,568 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,575 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,581 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,582 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... [2020-11-28 03:16:37,592 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-28 03:16:37,594 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-28 03:16:37,594 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-28 03:16:37,595 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-28 03:16:37,596 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:37,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-28 03:16:37,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-28 03:16:37,687 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-28 03:16:37,688 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-28 03:16:37,938 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-28 03:16:37,939 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-11-28 03:16:37,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:16:37 BoogieIcfgContainer [2020-11-28 03:16:37,941 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-28 03:16:37,942 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-28 03:16:37,943 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-28 03:16:37,947 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-28 03:16:37,947 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 28.11 03:16:37" (1/3) ... [2020-11-28 03:16:37,948 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e38edea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:16:37, skipping insertion in model container [2020-11-28 03:16:37,948 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 28.11 03:16:37" (2/3) ... [2020-11-28 03:16:37,949 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e38edea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 28.11 03:16:37, skipping insertion in model container [2020-11-28 03:16:37,949 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:16:37" (3/3) ... [2020-11-28 03:16:37,951 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.c [2020-11-28 03:16:37,963 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-28 03:16:37,981 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-28 03:16:38,025 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-28 03:16:38,064 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-28 03:16:38,065 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-28 03:16:38,075 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-28 03:16:38,075 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-28 03:16:38,076 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-28 03:16:38,076 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-28 03:16:38,076 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-28 03:16:38,076 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-28 03:16:38,105 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states. [2020-11-28 03:16:38,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-28 03:16:38,110 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:38,111 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-28 03:16:38,116 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:38,124 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:38,124 INFO L82 PathProgramCache]: Analyzing trace with hash 28696998, now seen corresponding path program 1 times [2020-11-28 03:16:38,134 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:38,136 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52833871] [2020-11-28 03:16:38,136 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:38,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:38,362 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:38,363 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52833871] [2020-11-28 03:16:38,364 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-28 03:16:38,365 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-28 03:16:38,366 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125728561] [2020-11-28 03:16:38,371 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-28 03:16:38,371 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:38,393 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-28 03:16:38,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-28 03:16:38,397 INFO L87 Difference]: Start difference. First operand 11 states. Second operand 3 states. [2020-11-28 03:16:38,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:38,464 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2020-11-28 03:16:38,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-28 03:16:38,467 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 5 [2020-11-28 03:16:38,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:38,479 INFO L225 Difference]: With dead ends: 20 [2020-11-28 03:16:38,479 INFO L226 Difference]: Without dead ends: 9 [2020-11-28 03:16:38,496 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 [2020-11-28 03:16:38,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-28 03:16:38,532 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 8. [2020-11-28 03:16:38,533 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-11-28 03:16:38,534 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 8 transitions. [2020-11-28 03:16:38,536 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 8 transitions. Word has length 5 [2020-11-28 03:16:38,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:38,537 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 8 transitions. [2020-11-28 03:16:38,537 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-28 03:16:38,538 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 8 transitions. [2020-11-28 03:16:38,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-28 03:16:38,539 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:38,539 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-28 03:16:38,540 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-28 03:16:38,540 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:38,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:38,545 INFO L82 PathProgramCache]: Analyzing trace with hash 1809669604, now seen corresponding path program 1 times [2020-11-28 03:16:38,546 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:38,546 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [82060963] [2020-11-28 03:16:38,547 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:38,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:38,663 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:38,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [82060963] [2020-11-28 03:16:38,664 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1185547424] [2020-11-28 03:16:38,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:38,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:38,767 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-28 03:16:38,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:16:38,830 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:38,830 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:16:38,830 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 5 [2020-11-28 03:16:38,831 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886683107] [2020-11-28 03:16:38,832 INFO L461 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-11-28 03:16:38,832 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:38,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-11-28 03:16:38,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:16:38,834 INFO L87 Difference]: Start difference. First operand 8 states and 8 transitions. Second operand 5 states. [2020-11-28 03:16:38,872 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:38,872 INFO L93 Difference]: Finished difference Result 14 states and 14 transitions. [2020-11-28 03:16:38,873 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-28 03:16:38,874 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 7 [2020-11-28 03:16:38,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:38,874 INFO L225 Difference]: With dead ends: 14 [2020-11-28 03:16:38,875 INFO L226 Difference]: Without dead ends: 11 [2020-11-28 03:16:38,876 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-11-28 03:16:38,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-28 03:16:38,878 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 10. [2020-11-28 03:16:38,879 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-28 03:16:38,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 10 transitions. [2020-11-28 03:16:38,880 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 10 transitions. Word has length 7 [2020-11-28 03:16:38,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:38,880 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 10 transitions. [2020-11-28 03:16:38,880 INFO L482 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-11-28 03:16:38,880 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 10 transitions. [2020-11-28 03:16:38,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-11-28 03:16:38,881 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:38,881 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1] [2020-11-28 03:16:39,093 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-28 03:16:39,093 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:39,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:39,094 INFO L82 PathProgramCache]: Analyzing trace with hash -367607134, now seen corresponding path program 2 times [2020-11-28 03:16:39,094 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:39,094 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1261218827] [2020-11-28 03:16:39,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:39,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:39,160 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:39,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1261218827] [2020-11-28 03:16:39,160 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [594380126] [2020-11-28 03:16:39,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:39,222 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2020-11-28 03:16:39,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:16:39,223 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-28 03:16:39,224 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:16:39,262 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:39,262 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:16:39,262 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5] total 6 [2020-11-28 03:16:39,262 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149891431] [2020-11-28 03:16:39,263 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-28 03:16:39,263 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:39,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-28 03:16:39,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:16:39,264 INFO L87 Difference]: Start difference. First operand 10 states and 10 transitions. Second operand 6 states. [2020-11-28 03:16:39,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:39,319 INFO L93 Difference]: Finished difference Result 16 states and 16 transitions. [2020-11-28 03:16:39,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-28 03:16:39,322 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 9 [2020-11-28 03:16:39,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:39,322 INFO L225 Difference]: With dead ends: 16 [2020-11-28 03:16:39,323 INFO L226 Difference]: Without dead ends: 13 [2020-11-28 03:16:39,323 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-11-28 03:16:39,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2020-11-28 03:16:39,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2020-11-28 03:16:39,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-11-28 03:16:39,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-11-28 03:16:39,332 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 9 [2020-11-28 03:16:39,333 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:39,333 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-11-28 03:16:39,333 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-28 03:16:39,333 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-11-28 03:16:39,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-28 03:16:39,333 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:39,334 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1] [2020-11-28 03:16:39,542 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:16:39,542 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:39,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:39,543 INFO L82 PathProgramCache]: Analyzing trace with hash -1081479200, now seen corresponding path program 3 times [2020-11-28 03:16:39,543 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:39,543 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [895427415] [2020-11-28 03:16:39,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:39,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:39,640 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:39,641 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [895427415] [2020-11-28 03:16:39,641 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1826339677] [2020-11-28 03:16:39,641 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:39,719 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2020-11-28 03:16:39,719 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:16:39,721 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-28 03:16:39,724 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:16:39,768 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:39,769 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:16:39,769 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6] total 7 [2020-11-28 03:16:39,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732313874] [2020-11-28 03:16:39,771 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-28 03:16:39,771 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:39,773 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-28 03:16:39,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:16:39,774 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 7 states. [2020-11-28 03:16:39,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:39,843 INFO L93 Difference]: Finished difference Result 18 states and 18 transitions. [2020-11-28 03:16:39,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-28 03:16:39,844 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-11-28 03:16:39,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:39,845 INFO L225 Difference]: With dead ends: 18 [2020-11-28 03:16:39,845 INFO L226 Difference]: Without dead ends: 15 [2020-11-28 03:16:39,846 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-28 03:16:39,846 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-11-28 03:16:39,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2020-11-28 03:16:39,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-11-28 03:16:39,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-11-28 03:16:39,852 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 11 [2020-11-28 03:16:39,853 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:39,853 INFO L481 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-11-28 03:16:39,853 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-28 03:16:39,853 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-11-28 03:16:39,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-11-28 03:16:39,854 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:39,854 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2020-11-28 03:16:40,060 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:16:40,061 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:40,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:40,062 INFO L82 PathProgramCache]: Analyzing trace with hash 82232734, now seen corresponding path program 4 times [2020-11-28 03:16:40,062 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:40,062 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [574542196] [2020-11-28 03:16:40,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:40,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:40,165 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:40,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [574542196] [2020-11-28 03:16:40,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1729649955] [2020-11-28 03:16:40,166 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:40,206 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-28 03:16:40,207 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:16:40,208 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-28 03:16:40,209 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:16:40,242 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:40,242 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:16:40,242 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 8 [2020-11-28 03:16:40,243 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211952166] [2020-11-28 03:16:40,243 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-28 03:16:40,243 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:40,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-28 03:16:40,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:16:40,245 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 8 states. [2020-11-28 03:16:40,318 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:40,319 INFO L93 Difference]: Finished difference Result 20 states and 20 transitions. [2020-11-28 03:16:40,319 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-11-28 03:16:40,319 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 13 [2020-11-28 03:16:40,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:40,320 INFO L225 Difference]: With dead ends: 20 [2020-11-28 03:16:40,320 INFO L226 Difference]: Without dead ends: 17 [2020-11-28 03:16:40,321 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 13 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=28, Unknown=0, NotChecked=0, Total=56 [2020-11-28 03:16:40,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-11-28 03:16:40,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 16. [2020-11-28 03:16:40,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-11-28 03:16:40,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 16 transitions. [2020-11-28 03:16:40,324 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 16 transitions. Word has length 13 [2020-11-28 03:16:40,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:40,324 INFO L481 AbstractCegarLoop]: Abstraction has 16 states and 16 transitions. [2020-11-28 03:16:40,324 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-28 03:16:40,324 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 16 transitions. [2020-11-28 03:16:40,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-11-28 03:16:40,324 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:40,325 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1] [2020-11-28 03:16:40,538 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-28 03:16:40,538 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:40,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:40,539 INFO L82 PathProgramCache]: Analyzing trace with hash 1717904348, now seen corresponding path program 5 times [2020-11-28 03:16:40,539 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:40,539 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [802593207] [2020-11-28 03:16:40,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:40,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-28 03:16:40,665 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:40,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [802593207] [2020-11-28 03:16:40,666 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524138426] [2020-11-28 03:16:40,666 INFO L93 rtionOrderModulation]: Changing assertion order to INSIDE_LOOP_FIRST1 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/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 [2020-11-28 03:16:40,714 INFO L228 tOrderPrioritization]: Assert order INSIDE_LOOP_FIRST1 issued 6 check-sat command(s) [2020-11-28 03:16:40,714 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-28 03:16:40,715 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-28 03:16:40,717 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-28 03:16:40,763 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-28 03:16:40,763 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-11-28 03:16:40,763 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 9 [2020-11-28 03:16:40,764 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419708188] [2020-11-28 03:16:40,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-28 03:16:40,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy CAMEL [2020-11-28 03:16:40,765 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-28 03:16:40,765 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:16:40,765 INFO L87 Difference]: Start difference. First operand 16 states and 16 transitions. Second operand 9 states. [2020-11-28 03:16:40,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-28 03:16:40,826 INFO L93 Difference]: Finished difference Result 21 states and 21 transitions. [2020-11-28 03:16:40,827 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-28 03:16:40,827 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 15 [2020-11-28 03:16:40,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-28 03:16:40,828 INFO L225 Difference]: With dead ends: 21 [2020-11-28 03:16:40,828 INFO L226 Difference]: Without dead ends: 18 [2020-11-28 03:16:40,828 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-28 03:16:40,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-11-28 03:16:40,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-11-28 03:16:40,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-11-28 03:16:40,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 18 transitions. [2020-11-28 03:16:40,832 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 18 transitions. Word has length 15 [2020-11-28 03:16:40,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-28 03:16:40,833 INFO L481 AbstractCegarLoop]: Abstraction has 18 states and 18 transitions. [2020-11-28 03:16:40,833 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-28 03:16:40,833 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 18 transitions. [2020-11-28 03:16:40,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-11-28 03:16:40,834 INFO L414 BasicCegarLoop]: Found error trace [2020-11-28 03:16:40,834 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1] [2020-11-28 03:16:41,048 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2020-11-28 03:16:41,049 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-28 03:16:41,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-28 03:16:41,050 INFO L82 PathProgramCache]: Analyzing trace with hash 1640295066, now seen corresponding path program 6 times [2020-11-28 03:16:41,050 INFO L162 FreeRefinementEngine]: Executing refinement strategy CAMEL [2020-11-28 03:16:41,050 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [603816215] [2020-11-28 03:16:41,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-28 03:16:41,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:16:41,075 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:16:41,106 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-28 03:16:41,107 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-28 03:16:41,123 INFO L173 FreeRefinementEngine]: Strategy CAMEL found a feasible trace [2020-11-28 03:16:41,123 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-28 03:16:41,124 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-11-28 03:16:41,156 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 28.11 03:16:41 BoogieIcfgContainer [2020-11-28 03:16:41,157 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-28 03:16:41,157 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-28 03:16:41,157 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-28 03:16:41,158 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-28 03:16:41,158 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 28.11 03:16:37" (3/4) ... [2020-11-28 03:16:41,160 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-28 03:16:41,211 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_99983948-5da6-49d6-9665-c1a9142c1495/bin/uautomizer/witness.graphml [2020-11-28 03:16:41,211 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-28 03:16:41,213 INFO L168 Benchmark]: Toolchain (without parser) took 3991.31 ms. Allocated memory was 83.9 MB in the beginning and 113.2 MB in the end (delta: 29.4 MB). Free memory was 54.0 MB in the beginning and 84.9 MB in the end (delta: -30.9 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:16:41,213 INFO L168 Benchmark]: CDTParser took 0.37 ms. Allocated memory is still 83.9 MB. Free memory was 44.1 MB in the beginning and 44.0 MB in the end (delta: 39.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:16:41,214 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.09 ms. Allocated memory is still 83.9 MB. Free memory was 53.8 MB in the beginning and 61.3 MB in the end (delta: -7.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:16:41,215 INFO L168 Benchmark]: Boogie Procedure Inliner took 46.59 ms. Allocated memory is still 83.9 MB. Free memory was 61.3 MB in the beginning and 60.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:16:41,215 INFO L168 Benchmark]: Boogie Preprocessor took 39.60 ms. Allocated memory is still 83.9 MB. Free memory was 60.1 MB in the beginning and 58.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:16:41,216 INFO L168 Benchmark]: RCFGBuilder took 346.88 ms. Allocated memory is still 83.9 MB. Free memory was 58.9 MB in the beginning and 49.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-28 03:16:41,217 INFO L168 Benchmark]: TraceAbstraction took 3214.32 ms. Allocated memory was 83.9 MB in the beginning and 113.2 MB in the end (delta: 29.4 MB). Free memory was 48.7 MB in the beginning and 87.0 MB in the end (delta: -38.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-28 03:16:41,218 INFO L168 Benchmark]: Witness Printer took 54.07 ms. Allocated memory is still 113.2 MB. Free memory was 87.0 MB in the beginning and 84.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-28 03:16:41,222 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.37 ms. Allocated memory is still 83.9 MB. Free memory was 44.1 MB in the beginning and 44.0 MB in the end (delta: 39.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 278.09 ms. Allocated memory is still 83.9 MB. Free memory was 53.8 MB in the beginning and 61.3 MB in the end (delta: -7.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 46.59 ms. Allocated memory is still 83.9 MB. Free memory was 61.3 MB in the beginning and 60.1 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 39.60 ms. Allocated memory is still 83.9 MB. Free memory was 60.1 MB in the beginning and 58.9 MB in the end (delta: 1.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 346.88 ms. Allocated memory is still 83.9 MB. Free memory was 58.9 MB in the beginning and 49.3 MB in the end (delta: 9.7 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3214.32 ms. Allocated memory was 83.9 MB in the beginning and 113.2 MB in the end (delta: 29.4 MB). Free memory was 48.7 MB in the beginning and 87.0 MB in the end (delta: -38.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 54.07 ms. Allocated memory is still 113.2 MB. Free memory was 87.0 MB in the beginning and 84.9 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: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int a = 6; [L19] a = 0 [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND FALSE !(a < 6) [L22] COND TRUE a == 6 [L13] __assert_fail("0", "nested_1b.c", 13, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 11 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.0s, OverallIterations: 7, TraceHistogramMax: 6, AutomataDifference: 0.4s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 34 SDtfs, 21 SDslu, 45 SDs, 0 SdLazy, 98 SolverSat, 6 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.2s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 83 GetRequests, 57 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.3s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=18occurred in iteration=6, 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, 6 MinimizatonAttempts, 5 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 132 NumberOfCodeBlocks, 131 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 104 ConstructedInterpolants, 0 QuantifiedInterpolants, 2664 SizeOfPredicates, 5 NumberOfNonLiveVariables, 201 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 11 InterpolantComputations, 1 PerfectInterpolantSequences, 0/110 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...