./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 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 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 0.2.0-7b2dab5 [2020-12-03 12:38:01,232 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-03 12:38:01,235 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-03 12:38:01,289 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-03 12:38:01,290 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-03 12:38:01,295 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-03 12:38:01,297 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-03 12:38:01,301 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-03 12:38:01,312 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-03 12:38:01,317 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-03 12:38:01,318 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-03 12:38:01,320 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-03 12:38:01,321 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-03 12:38:01,324 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-03 12:38:01,326 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-03 12:38:01,328 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-03 12:38:01,330 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-03 12:38:01,333 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-03 12:38:01,336 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-03 12:38:01,344 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-03 12:38:01,346 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-03 12:38:01,347 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-03 12:38:01,350 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-03 12:38:01,351 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-03 12:38:01,360 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-03 12:38:01,360 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-03 12:38:01,361 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-03 12:38:01,363 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-03 12:38:01,363 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-03 12:38:01,364 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-03 12:38:01,365 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-03 12:38:01,366 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-03 12:38:01,368 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-03 12:38:01,369 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-03 12:38:01,371 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-03 12:38:01,371 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-03 12:38:01,372 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-03 12:38:01,372 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-03 12:38:01,372 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-03 12:38:01,373 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-03 12:38:01,375 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-03 12:38:01,377 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-03 12:38:01,415 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-03 12:38:01,415 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-03 12:38:01,417 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-03 12:38:01,417 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-03 12:38:01,417 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-03 12:38:01,418 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-03 12:38:01,418 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-03 12:38:01,418 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-03 12:38:01,418 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-03 12:38:01,418 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-03 12:38:01,420 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-03 12:38:01,420 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-03 12:38:01,420 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-03 12:38:01,420 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-03 12:38:01,421 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-03 12:38:01,421 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-03 12:38:01,422 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-03 12:38:01,422 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-03 12:38:01,422 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-03 12:38:01,422 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-03 12:38:01,422 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-03 12:38:01,423 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-03 12:38:01,423 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-03 12:38:01,423 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-03 12:38:01,423 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-03 12:38:01,424 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-03 12:38:01,424 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-03 12:38:01,424 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-03 12:38:01,424 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-03 12:38:01,426 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-03 12:38:01,426 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-03 12:38:01,427 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-03 12:38:01,427 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-03 12:38:01,427 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-03 12:38:01,427 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-03 12:38:01,428 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-03 12:38:01,428 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-03 12:38:01,428 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-03 12:38:01,428 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-03 12:38:01,428 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c1836be5ce35667bc02ed393f2cbc8396b48b5bb [2020-12-03 12:38:01,698 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-03 12:38:01,730 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-03 12:38:01,733 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-03 12:38:01,734 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-03 12:38:01,737 INFO L275 PluginConnector]: CDTParser initialized [2020-12-03 12:38:01,738 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_1b.c [2020-12-03 12:38:01,800 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/data/c0a77a413/4719a8c980034719b6f83b11ae7b72d8/FLAG2eb992a18 [2020-12-03 12:38:02,339 INFO L306 CDTParser]: Found 1 translation units. [2020-12-03 12:38:02,340 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/sv-benchmarks/c/loop-simple/nested_1b.c [2020-12-03 12:38:02,350 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/data/c0a77a413/4719a8c980034719b6f83b11ae7b72d8/FLAG2eb992a18 [2020-12-03 12:38:02,705 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/data/c0a77a413/4719a8c980034719b6f83b11ae7b72d8 [2020-12-03 12:38:02,707 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-03 12:38:02,709 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-03 12:38:02,711 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-03 12:38:02,711 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-03 12:38:02,714 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-03 12:38:02,715 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:02,717 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3db4dd89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02, skipping insertion in model container [2020-12-03 12:38:02,718 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:02,725 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-03 12:38:02,737 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-03 12:38:02,891 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/sv-benchmarks/c/loop-simple/nested_1b.c[674,687] [2020-12-03 12:38:02,907 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:38:02,932 INFO L203 MainTranslator]: Completed pre-run [2020-12-03 12:38:02,951 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/sv-benchmarks/c/loop-simple/nested_1b.c[674,687] [2020-12-03 12:38:02,952 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-03 12:38:02,967 INFO L208 MainTranslator]: Completed translation [2020-12-03 12:38:02,969 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02 WrapperNode [2020-12-03 12:38:02,969 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-03 12:38:02,970 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-03 12:38:02,970 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-03 12:38:02,971 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-03 12:38:02,979 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:02,986 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,003 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-03 12:38:03,006 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-03 12:38:03,006 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-03 12:38:03,007 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-03 12:38:03,015 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,015 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,017 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,018 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,023 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,029 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,030 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... [2020-12-03 12:38:03,037 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-03 12:38:03,038 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-03 12:38:03,041 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-03 12:38:03,041 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-03 12:38:03,042 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/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 [2020-12-03 12:38:03,133 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-03 12:38:03,133 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-03 12:38:03,134 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-03 12:38:03,134 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-03 12:38:03,384 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-03 12:38:03,384 INFO L299 CfgBuilder]: Removed 5 assume(true) statements. [2020-12-03 12:38:03,386 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:38:03 BoogieIcfgContainer [2020-12-03 12:38:03,387 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-03 12:38:03,394 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-03 12:38:03,394 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-03 12:38:03,397 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-03 12:38:03,411 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 03.12 12:38:02" (1/3) ... [2020-12-03 12:38:03,412 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d333961 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:38:03, skipping insertion in model container [2020-12-03 12:38:03,412 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 03.12 12:38:02" (2/3) ... [2020-12-03 12:38:03,413 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2d333961 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 03.12 12:38:03, skipping insertion in model container [2020-12-03 12:38:03,413 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:38:03" (3/3) ... [2020-12-03 12:38:03,414 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.c [2020-12-03 12:38:03,436 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-03 12:38:03,439 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-03 12:38:03,451 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-03 12:38:03,490 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-03 12:38:03,490 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-03 12:38:03,491 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-03 12:38:03,491 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-03 12:38:03,491 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-03 12:38:03,491 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-03 12:38:03,491 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-03 12:38:03,491 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-03 12:38:03,520 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-12-03 12:38:03,526 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-03 12:38:03,527 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:38:03,527 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-03 12:38:03,528 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:38:03,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:38:03,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1788998, now seen corresponding path program 1 times [2020-12-03 12:38:03,551 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:38:03,551 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284516582] [2020-12-03 12:38:03,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:38:03,647 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:38:03,710 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:03,711 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284516582] [2020-12-03 12:38:03,712 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-03 12:38:03,712 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-03 12:38:03,713 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355363066] [2020-12-03 12:38:03,717 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-03 12:38:03,718 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:38:03,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-03 12:38:03,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-03 12:38:03,746 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2020-12-03 12:38:03,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:38:03,784 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-12-03 12:38:03,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-03 12:38:03,786 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-03 12:38:03,787 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:38:03,806 INFO L225 Difference]: With dead ends: 13 [2020-12-03 12:38:03,806 INFO L226 Difference]: Without dead ends: 6 [2020-12-03 12:38:03,809 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 [2020-12-03 12:38:03,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-12-03 12:38:03,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-12-03 12:38:03,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-12-03 12:38:03,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-12-03 12:38:03,840 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-12-03 12:38:03,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:38:03,841 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-12-03 12:38:03,841 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-03 12:38:03,841 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-12-03 12:38:03,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-03 12:38:03,842 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:38:03,842 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-12-03 12:38:03,842 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-03 12:38:03,843 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:38:03,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:38:03,844 INFO L82 PathProgramCache]: Analyzing trace with hash 55383007, now seen corresponding path program 1 times [2020-12-03 12:38:03,844 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:38:03,844 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [890021877] [2020-12-03 12:38:03,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:38:03,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:38:03,881 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:03,881 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [890021877] [2020-12-03 12:38:03,882 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [243738188] [2020-12-03 12:38:03,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/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 [2020-12-03 12:38:03,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:38:03,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-03 12:38:03,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:38:04,006 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:04,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:38:04,035 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:04,036 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1065183561] [2020-12-03 12:38:04,059 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-12-03 12:38:04,060 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:38:04,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:38:04,071 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:38:04,072 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:38:04,680 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:38:04,909 WARN L197 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 22 [2020-12-03 12:38:04,997 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-03 12:38:04,998 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:38:04,998 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-03 12:38:04,999 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [538137260] [2020-12-03 12:38:05,000 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-03 12:38:05,000 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:38:05,006 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-03 12:38:05,007 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-03 12:38:05,007 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 7 states. [2020-12-03 12:38:05,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:38:05,029 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-12-03 12:38:05,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-03 12:38:05,030 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 5 [2020-12-03 12:38:05,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:38:05,032 INFO L225 Difference]: With dead ends: 12 [2020-12-03 12:38:05,035 INFO L226 Difference]: Without dead ends: 9 [2020-12-03 12:38:05,037 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-12-03 12:38:05,038 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-03 12:38:05,041 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-03 12:38:05,041 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-03 12:38:05,042 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-03 12:38:05,042 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-12-03 12:38:05,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:38:05,043 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-03 12:38:05,043 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-03 12:38:05,043 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-03 12:38:05,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-03 12:38:05,044 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:38:05,044 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-12-03 12:38:05,273 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-03 12:38:05,273 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:38:05,273 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:38:05,274 INFO L82 PathProgramCache]: Analyzing trace with hash 572320390, now seen corresponding path program 2 times [2020-12-03 12:38:05,274 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:38:05,274 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106391750] [2020-12-03 12:38:05,274 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:38:05,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-03 12:38:05,333 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:05,334 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106391750] [2020-12-03 12:38:05,334 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [246832161] [2020-12-03 12:38:05,335 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/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 [2020-12-03 12:38:05,374 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-03 12:38:05,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-03 12:38:05,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-03 12:38:05,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-03 12:38:05,410 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:05,410 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-03 12:38:05,451 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-03 12:38:05,451 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2137425959] [2020-12-03 12:38:05,454 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-12-03 12:38:05,454 INFO L166 IcfgInterpreter]: Building call graph [2020-12-03 12:38:05,454 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-03 12:38:05,455 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-03 12:38:05,455 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-03 12:38:05,652 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-03 12:38:05,902 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-03 12:38:05,903 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-03 12:38:05,903 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2020-12-03 12:38:05,903 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1028450135] [2020-12-03 12:38:05,904 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-03 12:38:05,904 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-03 12:38:05,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-03 12:38:05,905 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-12-03 12:38:05,905 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2020-12-03 12:38:05,927 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-03 12:38:05,927 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-12-03 12:38:05,927 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-03 12:38:05,927 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2020-12-03 12:38:05,928 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-03 12:38:05,928 INFO L225 Difference]: With dead ends: 14 [2020-12-03 12:38:05,928 INFO L226 Difference]: Without dead ends: 11 [2020-12-03 12:38:05,929 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-12-03 12:38:05,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-03 12:38:05,931 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-03 12:38:05,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-03 12:38:05,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-03 12:38:05,932 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-12-03 12:38:05,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-03 12:38:05,932 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-03 12:38:05,933 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-03 12:38:05,933 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-03 12:38:05,933 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-03 12:38:05,933 INFO L414 BasicCegarLoop]: Found error trace [2020-12-03 12:38:05,933 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-12-03 12:38:06,156 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-03 12:38:06,156 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-03 12:38:06,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-03 12:38:06,156 INFO L82 PathProgramCache]: Analyzing trace with hash 241651110, now seen corresponding path program 3 times [2020-12-03 12:38:06,157 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-03 12:38:06,157 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1072218486] [2020-12-03 12:38:06,157 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-03 12:38:06,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:38:06,171 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:38:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-03 12:38:06,195 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-03 12:38:06,212 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-03 12:38:06,212 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-03 12:38:06,212 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-12-03 12:38:06,234 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 03.12 12:38:06 BoogieIcfgContainer [2020-12-03 12:38:06,235 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-03 12:38:06,235 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-03 12:38:06,235 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-03 12:38:06,235 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-03 12:38:06,236 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 03.12 12:38:03" (3/4) ... [2020-12-03 12:38:06,238 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-03 12:38:06,272 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_ddfd0609-eedb-4810-8427-60cbb1f5f1c1/bin/utaipan/witness.graphml [2020-12-03 12:38:06,272 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-03 12:38:06,273 INFO L168 Benchmark]: Toolchain (without parser) took 3563.53 ms. Allocated memory was 117.4 MB in the beginning and 151.0 MB in the end (delta: 33.6 MB). Free memory was 87.5 MB in the beginning and 102.0 MB in the end (delta: -14.4 MB). Peak memory consumption was 19.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,274 INFO L168 Benchmark]: CDTParser took 0.23 ms. Allocated memory is still 79.7 MB. Free memory was 37.6 MB in the beginning and 37.6 MB in the end (delta: 41.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:38:06,274 INFO L168 Benchmark]: CACSL2BoogieTranslator took 258.63 ms. Allocated memory is still 117.4 MB. Free memory was 87.5 MB in the beginning and 94.0 MB in the end (delta: -6.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,275 INFO L168 Benchmark]: Boogie Procedure Inliner took 33.28 ms. Allocated memory is still 117.4 MB. Free memory was 93.5 MB in the beginning and 92.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-03 12:38:06,275 INFO L168 Benchmark]: Boogie Preprocessor took 31.01 ms. Allocated memory is still 117.4 MB. Free memory was 92.4 MB in the beginning and 91.3 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,276 INFO L168 Benchmark]: RCFGBuilder took 354.15 ms. Allocated memory is still 117.4 MB. Free memory was 91.3 MB in the beginning and 78.8 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,277 INFO L168 Benchmark]: TraceAbstraction took 2841.07 ms. Allocated memory was 117.4 MB in the beginning and 151.0 MB in the end (delta: 33.6 MB). Free memory was 78.4 MB in the beginning and 104.1 MB in the end (delta: -25.7 MB). Peak memory consumption was 9.2 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,277 INFO L168 Benchmark]: Witness Printer took 36.88 ms. Allocated memory is still 151.0 MB. Free memory was 104.1 MB in the beginning and 102.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-03 12:38:06,280 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.23 ms. Allocated memory is still 79.7 MB. Free memory was 37.6 MB in the beginning and 37.6 MB in the end (delta: 41.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 258.63 ms. Allocated memory is still 117.4 MB. Free memory was 87.5 MB in the beginning and 94.0 MB in the end (delta: -6.5 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 33.28 ms. Allocated memory is still 117.4 MB. Free memory was 93.5 MB in the beginning and 92.4 MB in the end (delta: 1.1 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.01 ms. Allocated memory is still 117.4 MB. Free memory was 92.4 MB in the beginning and 91.3 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 354.15 ms. Allocated memory is still 117.4 MB. Free memory was 91.3 MB in the beginning and 78.8 MB in the end (delta: 12.5 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2841.07 ms. Allocated memory was 117.4 MB in the beginning and 151.0 MB in the end (delta: 33.6 MB). Free memory was 78.4 MB in the beginning and 104.1 MB in the end (delta: -25.7 MB). Peak memory consumption was 9.2 MB. Max. memory is 16.1 GB. * Witness Printer took 36.88 ms. Allocated memory is still 151.0 MB. Free memory was 104.1 MB in the beginning and 102.0 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: - CounterExampleResult [Line: 23]: a call to reach_error is reachable a call to reach_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 [L23] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.7s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 0 SDslu, 9 SDs, 0 SdLazy, 32 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 47 GetRequests, 27 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=11occurred in iteration=3, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.2s InterpolantComputationTime, 40 NumberOfCodeBlocks, 40 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 468 SizeOfPredicates, 0 NumberOfNonLiveVariables, 89 ConjunctsInSsa, 9 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/33 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...