./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_1-1.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_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_1-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/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 517a91fa544aee14f6c894b24f388accaee55d2d ......................................................................................................................................................................................................................................................................................................................................................................................................................... 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 [2020-12-09 17:10:49,382 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 17:10:49,383 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 17:10:49,411 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 17:10:49,412 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 17:10:49,413 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 17:10:49,415 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 17:10:49,417 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 17:10:49,419 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 17:10:49,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 17:10:49,421 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 17:10:49,422 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 17:10:49,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 17:10:49,424 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 17:10:49,425 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 17:10:49,426 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 17:10:49,427 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 17:10:49,428 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 17:10:49,429 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 17:10:49,431 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 17:10:49,432 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 17:10:49,433 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 17:10:49,434 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 17:10:49,435 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 17:10:49,438 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 17:10:49,439 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 17:10:49,439 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 17:10:49,440 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 17:10:49,441 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 17:10:49,442 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 17:10:49,442 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 17:10:49,443 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 17:10:49,444 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 17:10:49,445 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 17:10:49,445 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 17:10:49,445 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 17:10:49,446 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 17:10:49,446 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 17:10:49,446 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 17:10:49,447 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 17:10:49,447 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 17:10:49,448 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 17:10:49,470 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 17:10:49,470 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 17:10:49,471 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 17:10:49,471 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 17:10:49,471 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 17:10:49,471 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 17:10:49,471 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 17:10:49,472 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 17:10:49,472 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 17:10:49,472 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 17:10:49,472 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 17:10:49,472 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 17:10:49,472 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 17:10:49,473 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 17:10:49,473 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 17:10:49,474 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 17:10:49,474 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 17:10:49,474 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 17:10:49,474 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 17:10:49,474 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 17:10:49,474 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 17:10:49,475 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 17:10:49,476 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 17:10:49,476 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 17:10:49,476 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 17:10:49,476 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 17:10:49,477 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 17:10:49,478 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 517a91fa544aee14f6c894b24f388accaee55d2d [2020-12-09 17:10:49,655 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 17:10:49,670 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 17:10:49,672 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 17:10:49,673 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 17:10:49,674 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 17:10:49,675 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_1-1.c [2020-12-09 17:10:49,719 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/data/3c5481e90/03327060cb1b4b08910b16bf38def06b/FLAG4e1690375 [2020-12-09 17:10:50,083 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 17:10:50,083 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/sv-benchmarks/c/loop-acceleration/underapprox_1-1.c [2020-12-09 17:10:50,087 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/data/3c5481e90/03327060cb1b4b08910b16bf38def06b/FLAG4e1690375 [2020-12-09 17:10:50,096 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/data/3c5481e90/03327060cb1b4b08910b16bf38def06b [2020-12-09 17:10:50,098 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 17:10:50,099 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 17:10:50,100 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 17:10:50,100 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 17:10:50,103 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 17:10:50,104 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,106 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2ed13540 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50, skipping insertion in model container [2020-12-09 17:10:50,106 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,111 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 17:10:50,120 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 17:10:50,209 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_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/sv-benchmarks/c/loop-acceleration/underapprox_1-1.c[327,340] [2020-12-09 17:10:50,216 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 17:10:50,222 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 17:10:50,231 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_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/sv-benchmarks/c/loop-acceleration/underapprox_1-1.c[327,340] [2020-12-09 17:10:50,232 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 17:10:50,243 INFO L208 MainTranslator]: Completed translation [2020-12-09 17:10:50,243 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50 WrapperNode [2020-12-09 17:10:50,243 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 17:10:50,244 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 17:10:50,244 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 17:10:50,244 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 17:10:50,250 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,254 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,265 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 17:10:50,266 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 17:10:50,266 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 17:10:50,266 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 17:10:50,272 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,272 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,273 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,273 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,275 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,278 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,279 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... [2020-12-09 17:10:50,279 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 17:10:50,280 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 17:10:50,280 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 17:10:50,280 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 17:10:50,281 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/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 [2020-12-09 17:10:50,334 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 17:10:50,334 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 17:10:50,334 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 17:10:50,334 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 17:10:50,492 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 17:10:50,493 INFO L299 CfgBuilder]: Removed 7 assume(true) statements. [2020-12-09 17:10:50,494 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:10:50 BoogieIcfgContainer [2020-12-09 17:10:50,494 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 17:10:50,495 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 17:10:50,495 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 17:10:50,498 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 17:10:50,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 05:10:50" (1/3) ... [2020-12-09 17:10:50,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cae4071 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:10:50, skipping insertion in model container [2020-12-09 17:10:50,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 05:10:50" (2/3) ... [2020-12-09 17:10:50,499 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6cae4071 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 05:10:50, skipping insertion in model container [2020-12-09 17:10:50,499 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:10:50" (3/3) ... [2020-12-09 17:10:50,500 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-12-09 17:10:50,510 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 17:10:50,513 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 17:10:50,520 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 17:10:50,537 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 17:10:50,537 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 17:10:50,537 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 17:10:50,537 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 17:10:50,537 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 17:10:50,537 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 17:10:50,537 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 17:10:50,537 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 17:10:50,546 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-12-09 17:10:50,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 17:10:50,549 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:10:50,549 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 17:10:50,550 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:10:50,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:10:50,554 INFO L82 PathProgramCache]: Analyzing trace with hash 1818790, now seen corresponding path program 1 times [2020-12-09 17:10:50,560 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:10:50,561 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457180243] [2020-12-09 17:10:50,561 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:10:50,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:10:50,691 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:50,691 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457180243] [2020-12-09 17:10:50,692 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 17:10:50,692 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 17:10:50,693 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806232854] [2020-12-09 17:10:50,697 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-12-09 17:10:50,697 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:10:50,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-12-09 17:10:50,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-12-09 17:10:50,713 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2020-12-09 17:10:50,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:10:50,750 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2020-12-09 17:10:50,750 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-12-09 17:10:50,751 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-12-09 17:10:50,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:10:50,759 INFO L225 Difference]: With dead ends: 15 [2020-12-09 17:10:50,759 INFO L226 Difference]: Without dead ends: 6 [2020-12-09 17:10:50,761 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-12-09 17:10:50,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-12-09 17:10:50,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-12-09 17:10:50,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-12-09 17:10:50,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-12-09 17:10:50,785 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-12-09 17:10:50,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:10:50,786 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-12-09 17:10:50,786 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-12-09 17:10:50,786 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-12-09 17:10:50,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-12-09 17:10:50,786 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:10:50,786 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-12-09 17:10:50,786 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 17:10:50,787 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:10:50,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:10:50,788 INFO L82 PathProgramCache]: Analyzing trace with hash 55770291, now seen corresponding path program 1 times [2020-12-09 17:10:50,788 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:10:50,788 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1798938582] [2020-12-09 17:10:50,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:10:50,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:10:50,873 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:50,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1798938582] [2020-12-09 17:10:50,873 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145076762] [2020-12-09 17:10:50,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/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 [2020-12-09 17:10:50,905 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:10:50,906 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-12-09 17:10:50,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:10:50,934 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:50,934 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:10:50,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:50,958 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [928584007] [2020-12-09 17:10:50,974 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-12-09 17:10:50,974 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:10:50,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 17:10:50,981 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 17:10:50,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 17:10:51,290 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 17:10:51,484 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 17:10:51,485 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:10:51,485 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-12-09 17:10:51,485 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045723417] [2020-12-09 17:10:51,486 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 17:10:51,486 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:10:51,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 17:10:51,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-12-09 17:10:51,487 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 9 states. [2020-12-09 17:10:51,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:10:51,526 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-12-09 17:10:51,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 17:10:51,527 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-12-09 17:10:51,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:10:51,527 INFO L225 Difference]: With dead ends: 12 [2020-12-09 17:10:51,527 INFO L226 Difference]: Without dead ends: 9 [2020-12-09 17:10:51,528 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-12-09 17:10:51,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-12-09 17:10:51,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-12-09 17:10:51,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-12-09 17:10:51,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-12-09 17:10:51,529 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-12-09 17:10:51,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:10:51,530 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-12-09 17:10:51,530 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 17:10:51,530 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-12-09 17:10:51,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-12-09 17:10:51,530 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:10:51,530 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-12-09 17:10:51,731 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-12-09 17:10:51,732 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:10:51,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:10:51,734 INFO L82 PathProgramCache]: Analyzing trace with hash -1307517978, now seen corresponding path program 2 times [2020-12-09 17:10:51,734 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:10:51,735 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639200914] [2020-12-09 17:10:51,735 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:10:51,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 17:10:51,922 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:51,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639200914] [2020-12-09 17:10:51,922 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1461118146] [2020-12-09 17:10:51,922 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/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 [2020-12-09 17:10:51,951 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-12-09 17:10:51,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 17:10:51,951 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-12-09 17:10:51,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 17:10:52,012 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:52,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 17:10:52,092 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 17:10:52,092 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1292737491] [2020-12-09 17:10:52,095 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-12-09 17:10:52,095 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 17:10:52,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 17:10:52,095 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 17:10:52,095 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 17:10:52,233 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 17:10:52,530 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 17:10:52,530 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 17:10:52,530 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 17 [2020-12-09 17:10:52,530 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [778746097] [2020-12-09 17:10:52,530 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-12-09 17:10:52,531 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 17:10:52,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-12-09 17:10:52,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2020-12-09 17:10:52,532 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 18 states. [2020-12-09 17:10:52,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 17:10:52,657 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-12-09 17:10:52,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 17:10:52,657 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 8 [2020-12-09 17:10:52,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 17:10:52,657 INFO L225 Difference]: With dead ends: 14 [2020-12-09 17:10:52,657 INFO L226 Difference]: Without dead ends: 11 [2020-12-09 17:10:52,658 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2020-12-09 17:10:52,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-09 17:10:52,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-09 17:10:52,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 17:10:52,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-12-09 17:10:52,660 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-12-09 17:10:52,661 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 17:10:52,661 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-12-09 17:10:52,661 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-12-09 17:10:52,661 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-12-09 17:10:52,661 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 17:10:52,661 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 17:10:52,661 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-12-09 17:10:52,862 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-12-09 17:10:52,862 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 17:10:52,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 17:10:52,863 INFO L82 PathProgramCache]: Analyzing trace with hash 1881050502, now seen corresponding path program 3 times [2020-12-09 17:10:52,863 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 17:10:52,864 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335224048] [2020-12-09 17:10:52,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 17:10:52,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 17:10:52,893 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 17:10:52,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-12-09 17:10:52,936 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-12-09 17:10:52,970 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-12-09 17:10:52,970 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-12-09 17:10:52,971 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-12-09 17:10:53,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 05:10:53 BoogieIcfgContainer [2020-12-09 17:10:53,006 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 17:10:53,007 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 17:10:53,007 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 17:10:53,007 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 17:10:53,008 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 05:10:50" (3/4) ... [2020-12-09 17:10:53,009 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-12-09 17:10:53,042 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_c0ceee33-ba6e-4e2a-8fc7-607922d5486b/bin/utaipan/witness.graphml [2020-12-09 17:10:53,042 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 17:10:53,043 INFO L168 Benchmark]: Toolchain (without parser) took 2943.65 ms. Allocated memory was 102.8 MB in the beginning and 155.2 MB in the end (delta: 52.4 MB). Free memory was 72.5 MB in the beginning and 101.4 MB in the end (delta: -28.9 MB). Peak memory consumption was 25.4 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,044 INFO L168 Benchmark]: CDTParser took 0.18 ms. Allocated memory is still 102.8 MB. Free memory is still 79.7 MB. There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 17:10:53,044 INFO L168 Benchmark]: CACSL2BoogieTranslator took 143.13 ms. Allocated memory is still 102.8 MB. Free memory was 72.3 MB in the beginning and 63.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,045 INFO L168 Benchmark]: Boogie Procedure Inliner took 21.62 ms. Allocated memory is still 102.8 MB. Free memory was 62.9 MB in the beginning and 61.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,045 INFO L168 Benchmark]: Boogie Preprocessor took 13.64 ms. Allocated memory is still 102.8 MB. Free memory was 61.7 MB in the beginning and 60.7 MB in the end (delta: 993.1 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,046 INFO L168 Benchmark]: RCFGBuilder took 214.13 ms. Allocated memory is still 102.8 MB. Free memory was 60.6 MB in the beginning and 74.3 MB in the end (delta: -13.8 MB). Peak memory consumption was 8.8 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,047 INFO L168 Benchmark]: TraceAbstraction took 2511.26 ms. Allocated memory was 102.8 MB in the beginning and 155.2 MB in the end (delta: 52.4 MB). Free memory was 74.0 MB in the beginning and 103.5 MB in the end (delta: -29.5 MB). Peak memory consumption was 25.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,047 INFO L168 Benchmark]: Witness Printer took 35.28 ms. Allocated memory is still 155.2 MB. Free memory was 103.5 MB in the beginning and 101.4 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 17:10:53,050 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.18 ms. Allocated memory is still 102.8 MB. Free memory is still 79.7 MB. There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 143.13 ms. Allocated memory is still 102.8 MB. Free memory was 72.3 MB in the beginning and 63.0 MB in the end (delta: 9.3 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 21.62 ms. Allocated memory is still 102.8 MB. Free memory was 62.9 MB in the beginning and 61.7 MB in the end (delta: 1.3 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 13.64 ms. Allocated memory is still 102.8 MB. Free memory was 61.7 MB in the beginning and 60.7 MB in the end (delta: 993.1 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 214.13 ms. Allocated memory is still 102.8 MB. Free memory was 60.6 MB in the beginning and 74.3 MB in the end (delta: -13.8 MB). Peak memory consumption was 8.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 2511.26 ms. Allocated memory was 102.8 MB in the beginning and 155.2 MB in the end (delta: 52.4 MB). Free memory was 74.0 MB in the beginning and 103.5 MB in the end (delta: -29.5 MB). Peak memory consumption was 25.1 MB. Max. memory is 16.1 GB. * Witness Printer took 35.28 ms. Allocated memory is still 155.2 MB. Free memory was 103.5 MB in the beginning and 101.4 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: 7]: a call to reach_error is reachable a call to reach_error is reachable We found a FailurePath: [L13] unsigned int x = 0; [L14] unsigned int y = 1; [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND TRUE x < 6 [L17] x++ [L18] y *= 2 [L16] COND FALSE !(x < 6) [L6] COND TRUE !(cond) [L7] reach_error() - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 2.4s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 12 SDtfs, 6 SDslu, 44 SDs, 0 SdLazy, 105 SolverSat, 14 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 58 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 0.8s 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, 0.4s InterpolantComputationTime, 40 NumberOfCodeBlocks, 40 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 832 SizeOfPredicates, 2 NumberOfNonLiveVariables, 111 ConjunctsInSsa, 16 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...