./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/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 2879b5362dad4ee344e02d12e11f7b45d4f36399 ............................................................................................................................................................................................................................................................................................................................................................................................................................ Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-22 13:03:41,948 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:03:41,954 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:03:42,020 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:03:42,020 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:03:42,022 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:03:42,024 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:03:42,026 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:03:42,028 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:03:42,030 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:03:42,031 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:03:42,032 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:03:42,033 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:03:42,034 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:03:42,036 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:03:42,039 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:03:42,041 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:03:42,047 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:03:42,053 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:03:42,056 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:03:42,057 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:03:42,063 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:03:42,064 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:03:42,066 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:03:42,069 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:03:42,070 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:03:42,071 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:03:42,073 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:03:42,077 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:03:42,078 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:03:42,079 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:03:42,080 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:03:42,082 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:03:42,083 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:03:42,084 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:03:42,085 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:03:42,086 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:03:42,086 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:03:42,086 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:03:42,087 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:03:42,088 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:03:42,090 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:03:42,128 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:03:42,129 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:03:42,130 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:03:42,130 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:03:42,131 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:03:42,131 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:03:42,131 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:03:42,132 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:03:42,132 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:03:42,132 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:03:42,133 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:03:42,134 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:03:42,134 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:03:42,134 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:03:42,135 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:03:42,135 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:03:42,136 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:03:42,136 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:03:42,136 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:03:42,137 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:03:42,137 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:03:42,137 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:03:42,138 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:03:42,138 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:03:42,138 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:03:42,138 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:03:42,139 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:03:42,139 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:03:42,139 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:03:42,141 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:03:42,141 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:03:42,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:03:42,142 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:03:42,142 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:03:42,143 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:03:42,143 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:03:42,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:03:42,144 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:03:42,144 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:03:42,144 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:03:42,144 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_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2879b5362dad4ee344e02d12e11f7b45d4f36399 [2020-11-22 13:03:42,417 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:03:42,444 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:03:42,446 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:03:42,448 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:03:42,448 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:03:42,449 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-22 13:03:42,523 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/data/1b5762013/637fb8f8c0844494917300d1ad363c60/FLAG9a81ad3f5 [2020-11-22 13:03:42,884 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:03:42,884 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/sv-benchmarks/c/loop-acceleration/underapprox_2-1.c [2020-11-22 13:03:42,889 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/data/1b5762013/637fb8f8c0844494917300d1ad363c60/FLAG9a81ad3f5 [2020-11-22 13:03:43,303 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/data/1b5762013/637fb8f8c0844494917300d1ad363c60 [2020-11-22 13:03:43,305 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:03:43,306 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:03:43,308 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:43,308 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:03:43,316 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:03:43,316 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,318 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e6e4090 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43, skipping insertion in model container [2020-11-22 13:03:43,319 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,326 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:03:43,338 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:03:43,514 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:43,522 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:03:43,535 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:03:43,547 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:03:43,548 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43 WrapperNode [2020-11-22 13:03:43,548 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:03:43,549 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:43,549 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:03:43,549 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:03:43,557 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,563 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,578 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:03:43,579 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:03:43,579 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:03:43,579 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:03:43,587 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,587 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,588 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,588 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,591 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,596 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... [2020-11-22 13:03:43,597 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:03:43,598 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:03:43,598 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:03:43,598 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:03:43,599 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/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 [2020-11-22 13:03:43,672 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:03:43,673 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:03:43,673 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:03:43,673 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:03:43,918 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:03:43,918 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-22 13:03:43,920 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:43 BoogieIcfgContainer [2020-11-22 13:03:43,920 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:03:43,921 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:03:43,921 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:03:43,935 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:03:43,935 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:03:43" (1/3) ... [2020-11-22 13:03:43,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3512e30c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:43, skipping insertion in model container [2020-11-22 13:03:43,936 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:03:43" (2/3) ... [2020-11-22 13:03:43,936 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3512e30c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:03:43, skipping insertion in model container [2020-11-22 13:03:43,945 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:43" (3/3) ... [2020-11-22 13:03:43,946 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_2-1.c [2020-11-22 13:03:43,969 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:03:43,974 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:03:43,986 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:03:44,008 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:03:44,008 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:03:44,009 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:03:44,009 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:03:44,009 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:03:44,009 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:03:44,009 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:03:44,009 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:03:44,021 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-11-22 13:03:44,024 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 13:03:44,024 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:44,025 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 13:03:44,025 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:44,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:44,030 INFO L82 PathProgramCache]: Analyzing trace with hash 1881255, now seen corresponding path program 1 times [2020-11-22 13:03:44,037 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:44,037 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [740078216] [2020-11-22 13:03:44,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:44,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:44,223 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:44,223 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [740078216] [2020-11-22 13:03:44,224 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:03:44,224 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-22 13:03:44,225 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1496943315] [2020-11-22 13:03:44,229 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 13:03:44,229 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:44,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 13:03:44,243 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:03:44,245 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2020-11-22 13:03:44,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:44,293 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-22 13:03:44,294 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-22 13:03:44,295 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-22 13:03:44,296 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:44,302 INFO L225 Difference]: With dead ends: 13 [2020-11-22 13:03:44,302 INFO L226 Difference]: Without dead ends: 6 [2020-11-22 13:03:44,305 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:03:44,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-11-22 13:03:44,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-11-22 13:03:44,329 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-22 13:03:44,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-11-22 13:03:44,331 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-11-22 13:03:44,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:44,331 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-11-22 13:03:44,333 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 13:03:44,333 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-11-22 13:03:44,333 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-22 13:03:44,333 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:44,334 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-22 13:03:44,334 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:03:44,334 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:44,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:44,335 INFO L82 PathProgramCache]: Analyzing trace with hash 57620216, now seen corresponding path program 1 times [2020-11-22 13:03:44,336 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:44,336 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [463003064] [2020-11-22 13:03:44,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:44,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:44,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:44,486 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [463003064] [2020-11-22 13:03:44,487 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [136848082] [2020-11-22 13:03:44,487 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/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 [2020-11-22 13:03:44,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:44,553 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-22 13:03:44,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:44,583 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:44,583 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:44,628 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:44,629 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2072435061] [2020-11-22 13:03:44,650 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-22 13:03:44,651 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:44,655 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:03:44,661 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:03:44,661 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:03:45,193 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:03:45,322 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 34 [2020-11-22 13:03:45,511 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:03:45,511 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:45,511 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 7 [2020-11-22 13:03:45,512 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336609351] [2020-11-22 13:03:45,513 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-22 13:03:45,513 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:45,514 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-22 13:03:45,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=80, Unknown=0, NotChecked=0, Total=110 [2020-11-22 13:03:45,514 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 8 states. [2020-11-22 13:03:45,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:45,574 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-11-22 13:03:45,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 13:03:45,574 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 5 [2020-11-22 13:03:45,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:45,575 INFO L225 Difference]: With dead ends: 12 [2020-11-22 13:03:45,575 INFO L226 Difference]: Without dead ends: 9 [2020-11-22 13:03:45,576 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=37, Invalid=95, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:03:45,576 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-22 13:03:45,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-22 13:03:45,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-22 13:03:45,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-22 13:03:45,579 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-11-22 13:03:45,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:45,579 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-22 13:03:45,579 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-22 13:03:45,579 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-22 13:03:45,582 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 13:03:45,583 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:45,583 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-11-22 13:03:45,792 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-22 13:03:45,792 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:45,793 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:45,793 INFO L82 PathProgramCache]: Analyzing trace with hash -2116861721, now seen corresponding path program 2 times [2020-11-22 13:03:45,793 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:45,793 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [481540685] [2020-11-22 13:03:45,794 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:45,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:03:45,956 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:45,956 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [481540685] [2020-11-22 13:03:45,957 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1605152318] [2020-11-22 13:03:45,957 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/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 [2020-11-22 13:03:46,009 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-22 13:03:46,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:03:46,010 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-22 13:03:46,012 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:03:46,052 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:46,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:03:46,180 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-22 13:03:46,181 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1247239498] [2020-11-22 13:03:46,184 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-22 13:03:46,184 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:03:46,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:03:46,184 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:03:46,185 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:03:46,460 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:03:46,614 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 34 [2020-11-22 13:03:46,874 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 44 DAG size of output: 34 [2020-11-22 13:03:46,876 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:03:46,876 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:03:46,876 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 13 [2020-11-22 13:03:46,876 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1264982232] [2020-11-22 13:03:46,877 INFO L461 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-11-22 13:03:46,877 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:03:46,877 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-11-22 13:03:46,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:03:46,878 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 14 states. [2020-11-22 13:03:46,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:03:46,953 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-22 13:03:46,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:03:46,954 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 8 [2020-11-22 13:03:46,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:03:46,955 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:03:46,955 INFO L226 Difference]: Without dead ends: 11 [2020-11-22 13:03:46,956 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=60, Invalid=212, Unknown=0, NotChecked=0, Total=272 [2020-11-22 13:03:46,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-22 13:03:46,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-22 13:03:46,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-22 13:03:46,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-22 13:03:46,959 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-11-22 13:03:46,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:03:46,959 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-22 13:03:46,959 INFO L482 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-11-22 13:03:46,959 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-22 13:03:46,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:03:46,960 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:03:46,960 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-11-22 13:03:47,160 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-22 13:03:47,161 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:03:47,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:03:47,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1488026375, now seen corresponding path program 3 times [2020-11-22 13:03:47,161 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:03:47,162 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [634703730] [2020-11-22 13:03:47,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:03:47,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:47,185 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:47,215 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:03:47,215 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:03:47,240 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:03:47,240 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:03:47,241 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-22 13:03:47,271 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:03:47 BoogieIcfgContainer [2020-11-22 13:03:47,272 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:03:47,272 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:03:47,272 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:03:47,272 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:03:47,273 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:03:43" (3/4) ... [2020-11-22 13:03:47,274 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:03:47,348 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_13db3ea2-18cf-4c03-8be6-02575ae1e7fb/bin/utaipan/witness.graphml [2020-11-22 13:03:47,348 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:03:47,349 INFO L168 Benchmark]: Toolchain (without parser) took 4042.16 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 51.1 MB in the beginning and 87.0 MB in the end (delta: -35.8 MB). Peak memory consumption was 1.5 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:47,349 INFO L168 Benchmark]: CDTParser took 0.20 ms. Allocated memory is still 83.9 MB. Free memory was 56.4 MB in the beginning and 56.3 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:47,350 INFO L168 Benchmark]: CACSL2BoogieTranslator took 240.26 ms. Allocated memory is still 83.9 MB. Free memory was 50.9 MB in the beginning and 62.1 MB in the end (delta: -11.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:47,350 INFO L168 Benchmark]: Boogie Procedure Inliner took 29.37 ms. Allocated memory is still 83.9 MB. Free memory was 62.1 MB in the beginning and 60.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:47,351 INFO L168 Benchmark]: Boogie Preprocessor took 18.14 ms. Allocated memory is still 83.9 MB. Free memory was 60.9 MB in the beginning and 60.0 MB in the end (delta: 891.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:47,351 INFO L168 Benchmark]: RCFGBuilder took 322.09 ms. Allocated memory is still 83.9 MB. Free memory was 59.6 MB in the beginning and 47.4 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:47,352 INFO L168 Benchmark]: TraceAbstraction took 3350.27 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 47.0 MB in the beginning and 89.1 MB in the end (delta: -42.0 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:03:47,352 INFO L168 Benchmark]: Witness Printer took 75.95 ms. Allocated memory is still 121.6 MB. Free memory was 89.1 MB in the beginning and 87.0 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:03:47,355 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.20 ms. Allocated memory is still 83.9 MB. Free memory was 56.4 MB in the beginning and 56.3 MB in the end (delta: 29.8 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 240.26 ms. Allocated memory is still 83.9 MB. Free memory was 50.9 MB in the beginning and 62.1 MB in the end (delta: -11.2 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 29.37 ms. Allocated memory is still 83.9 MB. Free memory was 62.1 MB in the beginning and 60.9 MB in the end (delta: 1.2 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 18.14 ms. Allocated memory is still 83.9 MB. Free memory was 60.9 MB in the beginning and 60.0 MB in the end (delta: 891.7 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 322.09 ms. Allocated memory is still 83.9 MB. Free memory was 59.6 MB in the beginning and 47.4 MB in the end (delta: 12.1 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3350.27 ms. Allocated memory was 83.9 MB in the beginning and 121.6 MB in the end (delta: 37.7 MB). Free memory was 47.0 MB in the beginning and 89.1 MB in the end (delta: -42.0 MB). There was no memory consumed. Max. memory is 16.1 GB. * Witness Printer took 75.95 ms. Allocated memory is still 121.6 MB. Free memory was 89.1 MB in the beginning and 87.0 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: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_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) [L3] __assert_fail("0", "underapprox_2-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.2s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 1 SDslu, 30 SDs, 0 SdLazy, 66 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 50 GetRequests, 22 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 1.1s 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, 0.6s InterpolantComputationTime, 40 NumberOfCodeBlocks, 40 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 944 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...