./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_1-1.c -s /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/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-a4ecdab [2020-11-22 13:06:26,807 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-22 13:06:26,809 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-22 13:06:26,850 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-22 13:06:26,851 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-22 13:06:26,852 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-22 13:06:26,854 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-22 13:06:26,857 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-22 13:06:26,860 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-22 13:06:26,867 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-22 13:06:26,869 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-22 13:06:26,880 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-22 13:06:26,881 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-22 13:06:26,884 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-22 13:06:26,885 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-22 13:06:26,886 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-22 13:06:26,887 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-22 13:06:26,888 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-22 13:06:26,891 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-22 13:06:26,899 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-22 13:06:26,902 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-22 13:06:26,903 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-22 13:06:26,905 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-22 13:06:26,906 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-22 13:06:26,910 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-22 13:06:26,910 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-22 13:06:26,911 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-22 13:06:26,912 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-22 13:06:26,913 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-22 13:06:26,914 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-22 13:06:26,914 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-22 13:06:26,915 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-22 13:06:26,916 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-22 13:06:26,917 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-22 13:06:26,918 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-22 13:06:26,919 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-22 13:06:26,920 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-22 13:06:26,920 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-22 13:06:26,921 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-22 13:06:26,922 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-22 13:06:26,923 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-22 13:06:26,924 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-22 13:06:26,948 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-22 13:06:26,949 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-22 13:06:26,950 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-22 13:06:26,950 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-22 13:06:26,951 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-22 13:06:26,951 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-22 13:06:26,951 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-22 13:06:26,952 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-22 13:06:26,952 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-22 13:06:26,953 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-22 13:06:26,953 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-22 13:06:26,953 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-22 13:06:26,954 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-22 13:06:26,954 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-22 13:06:26,955 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-22 13:06:26,956 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-22 13:06:26,956 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-22 13:06:26,956 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-22 13:06:26,957 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-22 13:06:26,957 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-22 13:06:26,957 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-22 13:06:26,958 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-22 13:06:26,958 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-22 13:06:26,959 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-22 13:06:26,959 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-22 13:06:26,959 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-22 13:06:26,960 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-22 13:06:26,960 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-22 13:06:26,961 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-22 13:06:26,961 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-22 13:06:26,961 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-22 13:06:26,962 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-22 13:06:26,962 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-22 13:06:26,962 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-22 13:06:26,962 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-22 13:06:26,963 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-22 13:06:26,963 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-22 13:06:26,963 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-22 13:06:26,963 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-22 13:06:26,964 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-22 13:06:26,964 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_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 517a91fa544aee14f6c894b24f388accaee55d2d [2020-11-22 13:06:27,218 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-22 13:06:27,252 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-22 13:06:27,262 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-22 13:06:27,263 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-22 13:06:27,264 INFO L275 PluginConnector]: CDTParser initialized [2020-11-22 13:06:27,265 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_1-1.c [2020-11-22 13:06:27,338 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/data/682556d47/6627781f47b143c6aba0623b2042e14f/FLAG23c07f69d [2020-11-22 13:06:27,729 INFO L306 CDTParser]: Found 1 translation units. [2020-11-22 13:06:27,730 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/sv-benchmarks/c/loop-acceleration/underapprox_1-1.c [2020-11-22 13:06:27,735 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/data/682556d47/6627781f47b143c6aba0623b2042e14f/FLAG23c07f69d [2020-11-22 13:06:28,159 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/data/682556d47/6627781f47b143c6aba0623b2042e14f [2020-11-22 13:06:28,161 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-22 13:06:28,163 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-22 13:06:28,168 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-22 13:06:28,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-22 13:06:28,171 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-22 13:06:28,173 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,174 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@90118c3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28, skipping insertion in model container [2020-11-22 13:06:28,175 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,182 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-22 13:06:28,196 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-22 13:06:28,384 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:06:28,401 INFO L203 MainTranslator]: Completed pre-run [2020-11-22 13:06:28,417 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-22 13:06:28,431 INFO L208 MainTranslator]: Completed translation [2020-11-22 13:06:28,433 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28 WrapperNode [2020-11-22 13:06:28,433 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-22 13:06:28,435 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-22 13:06:28,435 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-22 13:06:28,435 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-22 13:06:28,443 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,454 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,472 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-22 13:06:28,475 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-22 13:06:28,475 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-22 13:06:28,476 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-22 13:06:28,484 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,485 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,486 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,487 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,492 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,496 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,504 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... [2020-11-22 13:06:28,506 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-22 13:06:28,507 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-22 13:06:28,508 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-22 13:06:28,510 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-22 13:06:28,511 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/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 13:06:28,565 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-22 13:06:28,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-22 13:06:28,566 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-22 13:06:28,566 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-22 13:06:28,799 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-22 13:06:28,800 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-22 13:06:28,801 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:28 BoogieIcfgContainer [2020-11-22 13:06:28,802 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-22 13:06:28,803 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-22 13:06:28,803 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-22 13:06:28,811 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-22 13:06:28,811 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 22.11 01:06:28" (1/3) ... [2020-11-22 13:06:28,812 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d63dd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:06:28, skipping insertion in model container [2020-11-22 13:06:28,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 22.11 01:06:28" (2/3) ... [2020-11-22 13:06:28,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6d63dd3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 22.11 01:06:28, skipping insertion in model container [2020-11-22 13:06:28,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:28" (3/3) ... [2020-11-22 13:06:28,814 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-1.c [2020-11-22 13:06:28,832 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-22 13:06:28,836 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-22 13:06:28,846 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-22 13:06:28,905 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-22 13:06:28,906 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-22 13:06:28,906 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-22 13:06:28,906 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-22 13:06:28,906 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-22 13:06:28,906 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-22 13:06:28,906 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-22 13:06:28,906 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-22 13:06:28,915 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-11-22 13:06:28,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-22 13:06:28,920 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:28,920 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-22 13:06:28,921 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:28,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:28,926 INFO L82 PathProgramCache]: Analyzing trace with hash 1881255, now seen corresponding path program 1 times [2020-11-22 13:06:28,935 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:28,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [598857434] [2020-11-22 13:06:28,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:29,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:29,201 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 13:06:29,202 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [598857434] [2020-11-22 13:06:29,203 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-22 13:06:29,203 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-22 13:06:29,203 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [596393539] [2020-11-22 13:06:29,207 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-22 13:06:29,207 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:29,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-22 13:06:29,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-22 13:06:29,222 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 4 states. [2020-11-22 13:06:29,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:29,279 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2020-11-22 13:06:29,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-11-22 13:06:29,281 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 4 [2020-11-22 13:06:29,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:29,288 INFO L225 Difference]: With dead ends: 15 [2020-11-22 13:06:29,288 INFO L226 Difference]: Without dead ends: 6 [2020-11-22 13:06:29,291 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 [2020-11-22 13:06:29,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-11-22 13:06:29,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-11-22 13:06:29,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-22 13:06:29,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-11-22 13:06:29,320 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-11-22 13:06:29,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:29,320 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-11-22 13:06:29,321 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-22 13:06:29,321 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-11-22 13:06:29,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-22 13:06:29,321 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:29,321 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-22 13:06:29,322 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-22 13:06:29,322 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:29,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:29,323 INFO L82 PathProgramCache]: Analyzing trace with hash 57620216, now seen corresponding path program 1 times [2020-11-22 13:06:29,323 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:29,323 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576206714] [2020-11-22 13:06:29,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:29,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:29,434 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 13:06:29,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576206714] [2020-11-22 13:06:29,435 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [232597793] [2020-11-22 13:06:29,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/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 13:06:29,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:29,502 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-22 13:06:29,506 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:29,538 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 13:06:29,538 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:29,571 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 13:06:29,571 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [231177936] [2020-11-22 13:06:29,604 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-22 13:06:29,604 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:29,611 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:06:29,617 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:06:29,618 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:06:30,229 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:06:30,364 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 38 [2020-11-22 13:06:30,582 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 37 [2020-11-22 13:06:30,586 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:06:30,586 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:30,586 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-11-22 13:06:30,587 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803678971] [2020-11-22 13:06:30,587 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-22 13:06:30,588 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:30,588 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-22 13:06:30,589 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-11-22 13:06:30,589 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 9 states. [2020-11-22 13:06:30,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:30,675 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-11-22 13:06:30,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-22 13:06:30,677 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 5 [2020-11-22 13:06:30,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:30,677 INFO L225 Difference]: With dead ends: 12 [2020-11-22 13:06:30,677 INFO L226 Difference]: Without dead ends: 9 [2020-11-22 13:06:30,678 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2020-11-22 13:06:30,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-22 13:06:30,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-22 13:06:30,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-22 13:06:30,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-22 13:06:30,681 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-11-22 13:06:30,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:30,682 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-22 13:06:30,682 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-22 13:06:30,682 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-22 13:06:30,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-22 13:06:30,682 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:30,683 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-11-22 13:06:30,883 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-22 13:06:30,884 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:30,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:30,884 INFO L82 PathProgramCache]: Analyzing trace with hash -2116861721, now seen corresponding path program 2 times [2020-11-22 13:06:30,884 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:30,884 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1680180246] [2020-11-22 13:06:30,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:30,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-22 13:06:31,027 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 13:06:31,027 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1680180246] [2020-11-22 13:06:31,028 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [780949117] [2020-11-22 13:06:31,028 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/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 13:06:31,080 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-22 13:06:31,080 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-22 13:06:31,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-22 13:06:31,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-22 13:06:31,158 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 13:06:31,158 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-22 13:06:31,275 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 13:06:31,276 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1318669516] [2020-11-22 13:06:31,278 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-22 13:06:31,278 INFO L166 IcfgInterpreter]: Building call graph [2020-11-22 13:06:31,279 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-22 13:06:31,279 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-22 13:06:31,279 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-22 13:06:31,514 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-22 13:06:31,669 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 38 [2020-11-22 13:06:31,962 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 47 DAG size of output: 37 [2020-11-22 13:06:31,963 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-22 13:06:31,963 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-22 13:06:31,963 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 6] total 17 [2020-11-22 13:06:31,963 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [898406153] [2020-11-22 13:06:31,964 INFO L461 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-11-22 13:06:31,964 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-22 13:06:31,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-11-22 13:06:31,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=355, Unknown=0, NotChecked=0, Total=420 [2020-11-22 13:06:31,966 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 18 states. [2020-11-22 13:06:32,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-22 13:06:32,217 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-22 13:06:32,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-22 13:06:32,218 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 8 [2020-11-22 13:06:32,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-22 13:06:32,219 INFO L225 Difference]: With dead ends: 14 [2020-11-22 13:06:32,219 INFO L226 Difference]: Without dead ends: 11 [2020-11-22 13:06:32,220 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=108, Invalid=542, Unknown=0, NotChecked=0, Total=650 [2020-11-22 13:06:32,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-22 13:06:32,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-22 13:06:32,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-22 13:06:32,223 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-22 13:06:32,223 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-11-22 13:06:32,223 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-22 13:06:32,223 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-22 13:06:32,223 INFO L482 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-11-22 13:06:32,225 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-22 13:06:32,226 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-22 13:06:32,226 INFO L414 BasicCegarLoop]: Found error trace [2020-11-22 13:06:32,226 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-11-22 13:06:32,426 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-22 13:06:32,427 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-22 13:06:32,427 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-22 13:06:32,427 INFO L82 PathProgramCache]: Analyzing trace with hash 1488026375, now seen corresponding path program 3 times [2020-11-22 13:06:32,427 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-22 13:06:32,428 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687416738] [2020-11-22 13:06:32,428 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-22 13:06:32,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:06:32,461 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:06:32,492 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-22 13:06:32,492 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-22 13:06:32,524 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-22 13:06:32,524 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-22 13:06:32,525 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-22 13:06:32,556 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 22.11 01:06:32 BoogieIcfgContainer [2020-11-22 13:06:32,556 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-22 13:06:32,556 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-22 13:06:32,557 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-22 13:06:32,557 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-22 13:06:32,557 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 22.11 01:06:28" (3/4) ... [2020-11-22 13:06:32,559 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-22 13:06:32,631 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_089c3e3e-64c3-489e-bbb2-6710cc1aefb2/bin/utaipan/witness.graphml [2020-11-22 13:06:32,631 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-22 13:06:32,632 INFO L168 Benchmark]: Toolchain (without parser) took 4469.14 ms. Allocated memory was 75.5 MB in the beginning and 119.5 MB in the end (delta: 44.0 MB). Free memory was 43.9 MB in the beginning and 47.3 MB in the end (delta: -3.3 MB). Peak memory consumption was 40.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,633 INFO L168 Benchmark]: CDTParser took 0.16 ms. Allocated memory is still 75.5 MB. Free memory was 56.3 MB in the beginning and 56.2 MB in the end (delta: 24.6 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:06:32,635 INFO L168 Benchmark]: CACSL2BoogieTranslator took 265.65 ms. Allocated memory was 75.5 MB in the beginning and 98.6 MB in the end (delta: 23.1 MB). Free memory was 43.6 MB in the beginning and 76.7 MB in the end (delta: -33.1 MB). Peak memory consumption was 7.8 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,637 INFO L168 Benchmark]: Boogie Procedure Inliner took 37.80 ms. Allocated memory is still 98.6 MB. Free memory was 76.7 MB in the beginning and 75.4 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-22 13:06:32,637 INFO L168 Benchmark]: Boogie Preprocessor took 30.87 ms. Allocated memory is still 98.6 MB. Free memory was 75.4 MB in the beginning and 74.6 MB in the end (delta: 831.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,637 INFO L168 Benchmark]: RCFGBuilder took 294.36 ms. Allocated memory is still 98.6 MB. Free memory was 74.3 MB in the beginning and 62.0 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,638 INFO L168 Benchmark]: TraceAbstraction took 3752.79 ms. Allocated memory was 98.6 MB in the beginning and 119.5 MB in the end (delta: 21.0 MB). Free memory was 61.4 MB in the beginning and 49.4 MB in the end (delta: 12.0 MB). Peak memory consumption was 34.3 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,638 INFO L168 Benchmark]: Witness Printer took 74.70 ms. Allocated memory is still 119.5 MB. Free memory was 49.4 MB in the beginning and 47.3 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-22 13:06:32,641 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.16 ms. Allocated memory is still 75.5 MB. Free memory was 56.3 MB in the beginning and 56.2 MB in the end (delta: 24.6 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 265.65 ms. Allocated memory was 75.5 MB in the beginning and 98.6 MB in the end (delta: 23.1 MB). Free memory was 43.6 MB in the beginning and 76.7 MB in the end (delta: -33.1 MB). Peak memory consumption was 7.8 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 37.80 ms. Allocated memory is still 98.6 MB. Free memory was 76.7 MB in the beginning and 75.4 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 30.87 ms. Allocated memory is still 98.6 MB. Free memory was 75.4 MB in the beginning and 74.6 MB in the end (delta: 831.5 kB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 294.36 ms. Allocated memory is still 98.6 MB. Free memory was 74.3 MB in the beginning and 62.0 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3752.79 ms. Allocated memory was 98.6 MB in the beginning and 119.5 MB in the end (delta: 21.0 MB). Free memory was 61.4 MB in the beginning and 49.4 MB in the end (delta: 12.0 MB). Peak memory consumption was 34.3 MB. Max. memory is 16.1 GB. * Witness Printer took 74.70 ms. Allocated memory is still 119.5 MB. Free memory was 49.4 MB in the beginning and 47.3 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_1-1.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: 3.6s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.4s, 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, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 58 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 75 ImplicationChecksByTransitivity, 1.3s 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, 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...