./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.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_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/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 992b306a3a5a9eaa476c1e842c528615cb39ce06 .......................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 01:51:52,986 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 01:51:52,990 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 01:51:53,096 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 01:51:53,097 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 01:51:53,103 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 01:51:53,105 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 01:51:53,114 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 01:51:53,117 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 01:51:53,124 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 01:51:53,130 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 01:51:53,132 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 01:51:53,133 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 01:51:53,137 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 01:51:53,139 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 01:51:53,142 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 01:51:53,143 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 01:51:53,148 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 01:51:53,153 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 01:51:53,163 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 01:51:53,166 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 01:51:53,168 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 01:51:53,171 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 01:51:53,173 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 01:51:53,184 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 01:51:53,185 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 01:51:53,185 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 01:51:53,188 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 01:51:53,189 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 01:51:53,191 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 01:51:53,191 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 01:51:53,193 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 01:51:53,196 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 01:51:53,197 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 01:51:53,199 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 01:51:53,200 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 01:51:53,201 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 01:51:53,201 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 01:51:53,202 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 01:51:53,203 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 01:51:53,204 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 01:51:53,207 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 01:51:53,259 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 01:51:53,260 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 01:51:53,262 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 01:51:53,262 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 01:51:53,262 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 01:51:53,263 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 01:51:53,263 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 01:51:53,263 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 01:51:53,264 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 01:51:53,264 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 01:51:53,265 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 01:51:53,266 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 01:51:53,266 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 01:51:53,267 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 01:51:53,267 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 01:51:53,268 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 01:51:53,268 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 01:51:53,268 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 01:51:53,269 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 01:51:53,269 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 01:51:53,269 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 01:51:53,270 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 01:51:53,270 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 01:51:53,270 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 01:51:53,271 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 01:51:53,271 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 01:51:53,271 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 01:51:53,272 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 01:51:53,272 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 01:51:53,274 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 01:51:53,274 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 01:51:53,275 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:51:53,275 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 01:51:53,276 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 01:51:53,276 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 01:51:53,276 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 01:51:53,277 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 01:51:53,277 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 01:51:53,277 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 01:51:53,278 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 01:51:53,278 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_ad37a285-1e11-4062-8bdc-13272aed7b35/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 992b306a3a5a9eaa476c1e842c528615cb39ce06 [2020-11-30 01:51:53,588 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:51:53,614 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:51:53,617 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:51:53,619 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:51:53,620 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:51:53,621 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/../../sv-benchmarks/c/loop-acceleration/underapprox_1-2.c [2020-11-30 01:51:53,705 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/data/8f6d62d98/c7c8c1aea8374840a938db57350e7116/FLAG03926b262 [2020-11-30 01:51:54,283 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:51:54,284 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/sv-benchmarks/c/loop-acceleration/underapprox_1-2.c [2020-11-30 01:51:54,294 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/data/8f6d62d98/c7c8c1aea8374840a938db57350e7116/FLAG03926b262 [2020-11-30 01:51:54,644 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/data/8f6d62d98/c7c8c1aea8374840a938db57350e7116 [2020-11-30 01:51:54,646 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:51:54,648 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:51:54,651 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:51:54,652 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:51:54,656 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:51:54,658 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:54,661 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6b16837a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54, skipping insertion in model container [2020-11-30 01:51:54,661 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:54,671 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:51:54,688 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:51:54,872 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:51:54,904 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:51:54,945 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:51:54,962 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:51:54,963 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54 WrapperNode [2020-11-30 01:51:54,963 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:51:54,965 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:51:54,965 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:51:54,965 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:51:54,977 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:54,986 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,008 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:51:55,010 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:51:55,010 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:51:55,010 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:51:55,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,020 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,020 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,024 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,028 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,029 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... [2020-11-30 01:51:55,031 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:51:55,032 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:51:55,032 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:51:55,033 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:51:55,034 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/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 [2020-11-30 01:51:55,124 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:51:55,124 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:51:55,124 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 01:51:55,125 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 01:51:55,646 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:51:55,647 INFO L298 CfgBuilder]: Removed 9 assume(true) statements. [2020-11-30 01:51:55,649 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:55 BoogieIcfgContainer [2020-11-30 01:51:55,650 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:51:55,653 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:51:55,655 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:51:55,659 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:51:55,659 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:51:54" (1/3) ... [2020-11-30 01:51:55,660 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a5416e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:51:55, skipping insertion in model container [2020-11-30 01:51:55,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:54" (2/3) ... [2020-11-30 01:51:55,661 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7a5416e7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:51:55, skipping insertion in model container [2020-11-30 01:51:55,661 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:55" (3/3) ... [2020-11-30 01:51:55,664 INFO L111 eAbstractionObserver]: Analyzing ICFG underapprox_1-2.c [2020-11-30 01:51:55,677 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:51:55,682 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 01:51:55,697 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 01:51:55,741 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:51:55,741 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:51:55,741 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:51:55,742 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:51:55,742 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:51:55,742 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:51:55,742 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:51:55,742 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:51:55,757 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-11-30 01:51:55,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 01:51:55,764 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:55,765 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 01:51:55,765 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:55,772 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:55,772 INFO L82 PathProgramCache]: Analyzing trace with hash 1881255, now seen corresponding path program 1 times [2020-11-30 01:51:55,784 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:55,785 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537687462] [2020-11-30 01:51:55,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:55,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:56,077 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:56,078 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537687462] [2020-11-30 01:51:56,079 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:51:56,079 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 01:51:56,080 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812155500] [2020-11-30 01:51:56,085 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 01:51:56,086 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:56,104 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 01:51:56,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:51:56,107 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2020-11-30 01:51:56,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:56,146 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-30 01:51:56,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 01:51:56,149 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-30 01:51:56,149 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:56,158 INFO L225 Difference]: With dead ends: 13 [2020-11-30 01:51:56,158 INFO L226 Difference]: Without dead ends: 6 [2020-11-30 01:51:56,168 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:51:56,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-11-30 01:51:56,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-11-30 01:51:56,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-30 01:51:56,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-11-30 01:51:56,208 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-11-30 01:51:56,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:56,209 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-11-30 01:51:56,209 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 01:51:56,209 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-11-30 01:51:56,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-30 01:51:56,209 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:56,210 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-30 01:51:56,210 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 01:51:56,211 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:56,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:56,214 INFO L82 PathProgramCache]: Analyzing trace with hash 57620216, now seen corresponding path program 1 times [2020-11-30 01:51:56,214 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:56,215 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1511349570] [2020-11-30 01:51:56,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:56,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:56,398 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:56,398 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1511349570] [2020-11-30 01:51:56,399 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1423893881] [2020-11-30 01:51:56,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/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 [2020-11-30 01:51:56,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:56,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-30 01:51:56,504 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:56,541 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:56,541 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:56,592 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:56,593 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1094871264] [2020-11-30 01:51:56,637 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:51:56,637 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:56,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:56,652 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:56,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:57,420 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:57,644 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 41 [2020-11-30 01:51:57,785 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 22 [2020-11-30 01:51:57,939 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2020-11-30 01:51:57,942 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:57,942 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:57,942 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-30 01:51:57,943 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [178660978] [2020-11-30 01:51:57,944 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 01:51:57,944 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:57,945 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 01:51:57,946 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-11-30 01:51:57,946 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 7 states. [2020-11-30 01:51:58,018 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:58,018 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-11-30 01:51:58,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:51:58,020 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 5 [2020-11-30 01:51:58,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:58,021 INFO L225 Difference]: With dead ends: 12 [2020-11-30 01:51:58,021 INFO L226 Difference]: Without dead ends: 9 [2020-11-30 01:51:58,022 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:51:58,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-30 01:51:58,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-30 01:51:58,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-30 01:51:58,024 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-30 01:51:58,024 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-11-30 01:51:58,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:58,025 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-30 01:51:58,025 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 01:51:58,025 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-30 01:51:58,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 01:51:58,025 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:58,026 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-11-30 01:51:58,235 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-30 01:51:58,235 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:58,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:58,236 INFO L82 PathProgramCache]: Analyzing trace with hash -2116861721, now seen corresponding path program 2 times [2020-11-30 01:51:58,236 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:58,236 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064062124] [2020-11-30 01:51:58,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:58,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:58,394 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:58,394 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064062124] [2020-11-30 01:51:58,395 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2064968914] [2020-11-30 01:51:58,395 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/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 [2020-11-30 01:51:58,457 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 01:51:58,458 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:51:58,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 11 conjunts are in the unsatisfiable core [2020-11-30 01:51:58,460 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:58,513 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:58,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:58,657 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:58,658 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1269784037] [2020-11-30 01:51:58,660 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:51:58,661 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:58,661 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:58,661 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:58,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:58,980 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:59,181 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 41 [2020-11-30 01:51:59,441 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 22 [2020-11-30 01:51:59,643 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2020-11-30 01:51:59,645 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:59,645 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:59,645 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2020-11-30 01:51:59,646 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [67900865] [2020-11-30 01:51:59,646 INFO L461 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-11-30 01:51:59,646 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:59,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-11-30 01:51:59,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-11-30 01:51:59,648 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 13 states. [2020-11-30 01:51:59,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:59,714 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-30 01:51:59,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 01:51:59,715 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 8 [2020-11-30 01:51:59,715 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:59,716 INFO L225 Difference]: With dead ends: 14 [2020-11-30 01:51:59,716 INFO L226 Difference]: Without dead ends: 11 [2020-11-30 01:51:59,717 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 13 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=58, Invalid=182, Unknown=0, NotChecked=0, Total=240 [2020-11-30 01:51:59,717 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-30 01:51:59,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-30 01:51:59,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 01:51:59,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-30 01:51:59,720 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-11-30 01:51:59,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:59,720 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-30 01:51:59,721 INFO L482 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-11-30 01:51:59,721 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-30 01:51:59,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 01:51:59,721 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:59,722 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-11-30 01:51:59,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-30 01:51:59,935 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:59,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:59,936 INFO L82 PathProgramCache]: Analyzing trace with hash 1488026375, now seen corresponding path program 3 times [2020-11-30 01:51:59,936 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:59,936 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1305199476] [2020-11-30 01:51:59,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:59,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:52:13,864 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 3 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:52:13,865 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1305199476] [2020-11-30 01:52:13,865 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1740459385] [2020-11-30 01:52:13,865 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:52:13,911 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 01:52:13,911 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:52:13,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 17 conjunts are in the unsatisfiable core [2020-11-30 01:52:13,914 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:52:16,271 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:52:16,271 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:54:22,991 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 6 refuted. 15 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:54:22,992 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [826044430] [2020-11-30 01:54:22,995 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:54:22,995 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:54:22,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:54:22,996 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:54:22,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:54:23,295 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:54:23,629 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 41 [2020-11-30 01:54:36,654 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2020-11-30 01:54:36,655 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:54:36,655 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:54:36,656 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 22 [2020-11-30 01:54:36,656 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1926924389] [2020-11-30 01:54:36,657 INFO L461 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-11-30 01:54:36,657 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:54:36,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-11-30 01:54:36,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=468, Unknown=69, NotChecked=0, Total=650 [2020-11-30 01:54:36,658 INFO L87 Difference]: Start difference. First operand 11 states and 11 transitions. Second operand 23 states. [2020-11-30 01:54:38,835 WARN L838 $PredicateComparison]: unable to prove that (and (not (= (let ((.cse0 (* c_ULTIMATE.start_main_~y~0 8))) (let ((.cse3 (div .cse0 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse1 (div (+ .cse0 .cse2) 3))) (+ (* 4294967296 (div (+ .cse0 (* .cse1 (- 3)) .cse2) 4294967296)) (* 3 .cse1) (* 4294967296 .cse3)))))) (* 8 c_ULTIMATE.start_main_~y~0))) (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse5 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse7 (div .cse5 4294967296))) (let ((.cse6 (* .cse7 (- 4294967296)))) (let ((.cse4 (div (+ .cse5 .cse6) 3))) (+ (* 3 .cse4) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse5 .cse6) 4294967296)) (* 4294967296 .cse7)))))))) (not (= (* 32 c_ULTIMATE.start_main_~y~0) (let ((.cse10 (* c_ULTIMATE.start_main_~y~0 32))) (let ((.cse11 (div .cse10 4294967296))) (let ((.cse8 (* .cse11 (- 4294967296)))) (let ((.cse9 (div (+ .cse8 .cse10) 3))) (+ (* 4294967296 (div (+ .cse8 (* .cse9 (- 3)) .cse10) 4294967296)) (* 4294967296 .cse11) (* 3 .cse9)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse13 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse14 (* .cse13 (- 4294967296)))) (let ((.cse12 (div (+ .cse14 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse12) (* 4294967296 .cse13) (* 4294967296 (div (+ (* .cse12 (- 3)) .cse14 c_ULTIMATE.start_main_~y~0) 4294967296)))))))) (not (= (* 16 c_ULTIMATE.start_main_~y~0) (let ((.cse18 (* c_ULTIMATE.start_main_~y~0 16))) (let ((.cse15 (div .cse18 4294967296))) (let ((.cse17 (* .cse15 (- 4294967296)))) (let ((.cse16 (div (+ .cse17 .cse18) 3))) (+ (* 4294967296 .cse15) (* 3 .cse16) (* 4294967296 (div (+ .cse17 (* .cse16 (- 3)) .cse18) 4294967296))))))))) (not (= (let ((.cse22 (* c_ULTIMATE.start_main_~y~0 4))) (let ((.cse20 (div .cse22 4294967296))) (let ((.cse21 (* .cse20 (- 4294967296)))) (let ((.cse19 (div (+ .cse21 .cse22) 3))) (+ (* 3 .cse19) (* 4294967296 .cse20) (* 4294967296 (div (+ (* .cse19 (- 3)) .cse21 .cse22) 4294967296))))))) (* 4 c_ULTIMATE.start_main_~y~0))) (not (= (let ((.cse25 (* c_ULTIMATE.start_main_~y~0 64))) (let ((.cse23 (div .cse25 4294967296))) (let ((.cse24 (* .cse23 (- 4294967296)))) (let ((.cse26 (div (+ .cse24 .cse25) 3))) (+ (* 4294967296 .cse23) (* 4294967296 (div (+ .cse24 .cse25 (* .cse26 (- 3))) 4294967296)) (* 3 .cse26)))))) (* 64 c_ULTIMATE.start_main_~y~0)))) is different from false [2020-11-30 01:54:41,028 WARN L860 $PredicateComparison]: unable to prove that (and (not (= (let ((.cse0 (* c_ULTIMATE.start_main_~y~0 8))) (let ((.cse3 (div .cse0 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse1 (div (+ .cse0 .cse2) 3))) (+ (* 4294967296 (div (+ .cse0 (* .cse1 (- 3)) .cse2) 4294967296)) (* 3 .cse1) (* 4294967296 .cse3)))))) (* 8 c_ULTIMATE.start_main_~y~0))) (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse5 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse7 (div .cse5 4294967296))) (let ((.cse6 (* .cse7 (- 4294967296)))) (let ((.cse4 (div (+ .cse5 .cse6) 3))) (+ (* 3 .cse4) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse5 .cse6) 4294967296)) (* 4294967296 .cse7)))))))) (not (= (* 32 c_ULTIMATE.start_main_~y~0) (let ((.cse10 (* c_ULTIMATE.start_main_~y~0 32))) (let ((.cse11 (div .cse10 4294967296))) (let ((.cse8 (* .cse11 (- 4294967296)))) (let ((.cse9 (div (+ .cse8 .cse10) 3))) (+ (* 4294967296 (div (+ .cse8 (* .cse9 (- 3)) .cse10) 4294967296)) (* 4294967296 .cse11) (* 3 .cse9)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse13 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse14 (* .cse13 (- 4294967296)))) (let ((.cse12 (div (+ .cse14 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse12) (* 4294967296 .cse13) (* 4294967296 (div (+ (* .cse12 (- 3)) .cse14 c_ULTIMATE.start_main_~y~0) 4294967296)))))))) (not (= (* 16 c_ULTIMATE.start_main_~y~0) (let ((.cse18 (* c_ULTIMATE.start_main_~y~0 16))) (let ((.cse15 (div .cse18 4294967296))) (let ((.cse17 (* .cse15 (- 4294967296)))) (let ((.cse16 (div (+ .cse17 .cse18) 3))) (+ (* 4294967296 .cse15) (* 3 .cse16) (* 4294967296 (div (+ .cse17 (* .cse16 (- 3)) .cse18) 4294967296))))))))) (not (= (let ((.cse22 (* c_ULTIMATE.start_main_~y~0 4))) (let ((.cse20 (div .cse22 4294967296))) (let ((.cse21 (* .cse20 (- 4294967296)))) (let ((.cse19 (div (+ .cse21 .cse22) 3))) (+ (* 3 .cse19) (* 4294967296 .cse20) (* 4294967296 (div (+ (* .cse19 (- 3)) .cse21 .cse22) 4294967296))))))) (* 4 c_ULTIMATE.start_main_~y~0))) (not (= (let ((.cse25 (* c_ULTIMATE.start_main_~y~0 64))) (let ((.cse23 (div .cse25 4294967296))) (let ((.cse24 (* .cse23 (- 4294967296)))) (let ((.cse26 (div (+ .cse24 .cse25) 3))) (+ (* 4294967296 .cse23) (* 4294967296 (div (+ .cse24 .cse25 (* .cse26 (- 3))) 4294967296)) (* 3 .cse26)))))) (* 64 c_ULTIMATE.start_main_~y~0)))) is different from true [2020-11-30 01:54:43,050 WARN L838 $PredicateComparison]: unable to prove that (and (not (= (let ((.cse0 (* c_ULTIMATE.start_main_~y~0 8))) (let ((.cse3 (div .cse0 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse1 (div (+ .cse0 .cse2) 3))) (+ (* 4294967296 (div (+ .cse0 (* .cse1 (- 3)) .cse2) 4294967296)) (* 3 .cse1) (* 4294967296 .cse3)))))) (* 8 c_ULTIMATE.start_main_~y~0))) (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse5 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse7 (div .cse5 4294967296))) (let ((.cse6 (* .cse7 (- 4294967296)))) (let ((.cse4 (div (+ .cse5 .cse6) 3))) (+ (* 3 .cse4) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse5 .cse6) 4294967296)) (* 4294967296 .cse7)))))))) (not (= (* 32 c_ULTIMATE.start_main_~y~0) (let ((.cse10 (* c_ULTIMATE.start_main_~y~0 32))) (let ((.cse11 (div .cse10 4294967296))) (let ((.cse8 (* .cse11 (- 4294967296)))) (let ((.cse9 (div (+ .cse8 .cse10) 3))) (+ (* 4294967296 (div (+ .cse8 (* .cse9 (- 3)) .cse10) 4294967296)) (* 4294967296 .cse11) (* 3 .cse9)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse13 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse14 (* .cse13 (- 4294967296)))) (let ((.cse12 (div (+ .cse14 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse12) (* 4294967296 .cse13) (* 4294967296 (div (+ (* .cse12 (- 3)) .cse14 c_ULTIMATE.start_main_~y~0) 4294967296)))))))) (not (= (* 16 c_ULTIMATE.start_main_~y~0) (let ((.cse18 (* c_ULTIMATE.start_main_~y~0 16))) (let ((.cse15 (div .cse18 4294967296))) (let ((.cse17 (* .cse15 (- 4294967296)))) (let ((.cse16 (div (+ .cse17 .cse18) 3))) (+ (* 4294967296 .cse15) (* 3 .cse16) (* 4294967296 (div (+ .cse17 (* .cse16 (- 3)) .cse18) 4294967296))))))))) (not (= (let ((.cse22 (* c_ULTIMATE.start_main_~y~0 4))) (let ((.cse20 (div .cse22 4294967296))) (let ((.cse21 (* .cse20 (- 4294967296)))) (let ((.cse19 (div (+ .cse21 .cse22) 3))) (+ (* 3 .cse19) (* 4294967296 .cse20) (* 4294967296 (div (+ (* .cse19 (- 3)) .cse21 .cse22) 4294967296))))))) (* 4 c_ULTIMATE.start_main_~y~0)))) is different from false [2020-11-30 01:55:36,184 WARN L193 SmtUtils]: Spent 21.62 s on a formula simplification that was a NOOP. DAG size: 83 [2020-11-30 01:56:35,283 WARN L193 SmtUtils]: Spent 22.86 s on a formula simplification that was a NOOP. DAG size: 86 [2020-11-30 01:57:28,214 WARN L193 SmtUtils]: Spent 13.94 s on a formula simplification that was a NOOP. DAG size: 67 [2020-11-30 01:57:36,327 WARN L838 $PredicateComparison]: unable to prove that (and (not (= (let ((.cse0 (* c_ULTIMATE.start_main_~y~0 8))) (let ((.cse3 (div .cse0 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse1 (div (+ .cse0 .cse2) 3))) (+ (* 4294967296 (div (+ .cse0 (* .cse1 (- 3)) .cse2) 4294967296)) (* 3 .cse1) (* 4294967296 .cse3)))))) (* 8 c_ULTIMATE.start_main_~y~0))) (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse5 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse7 (div .cse5 4294967296))) (let ((.cse6 (* .cse7 (- 4294967296)))) (let ((.cse4 (div (+ .cse5 .cse6) 3))) (+ (* 3 .cse4) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse5 .cse6) 4294967296)) (* 4294967296 .cse7)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse9 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse10 (* .cse9 (- 4294967296)))) (let ((.cse8 (div (+ .cse10 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse8) (* 4294967296 .cse9) (* 4294967296 (div (+ (* .cse8 (- 3)) .cse10 c_ULTIMATE.start_main_~y~0) 4294967296)))))))) (<= 1 c_ULTIMATE.start___VERIFIER_assert_~cond) (not (= (let ((.cse14 (* c_ULTIMATE.start_main_~y~0 4))) (let ((.cse12 (div .cse14 4294967296))) (let ((.cse13 (* .cse12 (- 4294967296)))) (let ((.cse11 (div (+ .cse13 .cse14) 3))) (+ (* 3 .cse11) (* 4294967296 .cse12) (* 4294967296 (div (+ (* .cse11 (- 3)) .cse13 .cse14) 4294967296))))))) (* 4 c_ULTIMATE.start_main_~y~0)))) is different from false [2020-11-30 01:57:46,521 WARN L860 $PredicateComparison]: unable to prove that (and (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse1 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse3 (div .cse1 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse0 (div (+ .cse1 .cse2) 3))) (+ (* 3 .cse0) (* 4294967296 (div (+ (* .cse0 (- 3)) .cse1 .cse2) 4294967296)) (* 4294967296 .cse3)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse5 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse6 (* .cse5 (- 4294967296)))) (let ((.cse4 (div (+ .cse6 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse4) (* 4294967296 .cse5) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse6 c_ULTIMATE.start_main_~y~0) 4294967296)))))))) (not (= (let ((.cse10 (* c_ULTIMATE.start_main_~y~0 4))) (let ((.cse8 (div .cse10 4294967296))) (let ((.cse9 (* .cse8 (- 4294967296)))) (let ((.cse7 (div (+ .cse9 .cse10) 3))) (+ (* 3 .cse7) (* 4294967296 .cse8) (* 4294967296 (div (+ (* .cse7 (- 3)) .cse9 .cse10) 4294967296))))))) (* 4 c_ULTIMATE.start_main_~y~0)))) is different from true [2020-11-30 01:57:48,631 WARN L838 $PredicateComparison]: unable to prove that (and (not (= (* 2 c_ULTIMATE.start_main_~y~0) (let ((.cse1 (* c_ULTIMATE.start_main_~y~0 2))) (let ((.cse3 (div .cse1 4294967296))) (let ((.cse2 (* .cse3 (- 4294967296)))) (let ((.cse0 (div (+ .cse1 .cse2) 3))) (+ (* 3 .cse0) (* 4294967296 (div (+ (* .cse0 (- 3)) .cse1 .cse2) 4294967296)) (* 4294967296 .cse3)))))))) (not (= c_ULTIMATE.start_main_~y~0 (let ((.cse5 (div c_ULTIMATE.start_main_~y~0 4294967296))) (let ((.cse6 (* .cse5 (- 4294967296)))) (let ((.cse4 (div (+ .cse6 c_ULTIMATE.start_main_~y~0) 3))) (+ (* 3 .cse4) (* 4294967296 .cse5) (* 4294967296 (div (+ (* .cse4 (- 3)) .cse6 c_ULTIMATE.start_main_~y~0) 4294967296))))))))) is different from false [2020-11-30 01:58:24,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:58:24,446 INFO L93 Difference]: Finished difference Result 26 states and 33 transitions. [2020-11-30 01:58:24,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-11-30 01:58:24,447 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 10 [2020-11-30 01:58:24,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:58:24,447 INFO L225 Difference]: With dead ends: 26 [2020-11-30 01:58:24,448 INFO L226 Difference]: Without dead ends: 19 [2020-11-30 01:58:24,449 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 10 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 344.9s TimeCoverageRelationStatistics Valid=184, Invalid=641, Unknown=125, NotChecked=310, Total=1260 [2020-11-30 01:58:24,449 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-11-30 01:58:24,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-11-30 01:58:24,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-11-30 01:58:24,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-11-30 01:58:24,457 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 10 [2020-11-30 01:58:24,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:58:24,457 INFO L481 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-11-30 01:58:24,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-11-30 01:58:24,457 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-11-30 01:58:24,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-30 01:58:24,458 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:58:24,458 INFO L422 BasicCegarLoop]: trace histogram [14, 1, 1, 1, 1] [2020-11-30 01:58:24,658 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2020-11-30 01:58:24,659 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:58:24,659 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:58:24,659 INFO L82 PathProgramCache]: Analyzing trace with hash -50195577, now seen corresponding path program 4 times [2020-11-30 01:58:24,663 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:58:24,664 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [829349572] [2020-11-30 01:58:24,664 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:58:24,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:58:24,905 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 56 proven. 21 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2020-11-30 01:58:24,905 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [829349572] [2020-11-30 01:58:24,906 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215943163] [2020-11-30 01:58:24,906 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:58:24,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:58:24,967 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 25 conjunts are in the unsatisfiable core [2020-11-30 01:58:24,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:58:25,124 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 36 proven. 66 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-30 01:58:25,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:58:25,642 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 36 proven. 66 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-11-30 01:58:25,643 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [716744120] [2020-11-30 01:58:25,645 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 01:58:25,645 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:58:25,646 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:58:25,646 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:58:25,646 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:58:25,885 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:58:26,131 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 41 [2020-11-30 01:58:26,466 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 50 DAG size of output: 40 [2020-11-30 01:58:26,467 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:58:26,467 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:58:26,467 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 13, 13] total 26 [2020-11-30 01:58:26,468 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [995119585] [2020-11-30 01:58:26,468 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-30 01:58:26,468 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:58:26,469 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-30 01:58:26,470 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=678, Unknown=0, NotChecked=0, Total=870 [2020-11-30 01:58:26,470 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 27 states. [2020-11-30 01:58:26,640 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:58:26,640 INFO L93 Difference]: Finished difference Result 19 states and 19 transitions. [2020-11-30 01:58:26,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 01:58:26,641 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 18 [2020-11-30 01:58:26,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:58:26,642 INFO L225 Difference]: With dead ends: 19 [2020-11-30 01:58:26,642 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 01:58:26,643 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 31 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 144 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=192, Invalid=678, Unknown=0, NotChecked=0, Total=870 [2020-11-30 01:58:26,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 01:58:26,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 01:58:26,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 01:58:26,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 01:58:26,644 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 18 [2020-11-30 01:58:26,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:58:26,644 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 01:58:26,644 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-30 01:58:26,644 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 01:58:26,644 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 01:58:26,855 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:58:26,856 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-30 01:58:27,041 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 48 DAG size of output: 40 [2020-11-30 01:58:27,046 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-30 01:58:27,046 INFO L274 CegarLoopResult]: For program point L7(line 7) no Hoare annotation was computed. [2020-11-30 01:58:27,046 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-30 01:58:27,046 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 3) no Hoare annotation was computed. [2020-11-30 01:58:27,046 INFO L270 CegarLoopResult]: At program point L16-2(lines 16 19) the Hoare annotation is: (or (and (= ULTIMATE.start_main_~x~0 0) (= ULTIMATE.start_main_~y~0 1)) (and (<= 3 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 8) (<= ULTIMATE.start_main_~x~0 3)) (and (= ULTIMATE.start_main_~x~0 1) (= ULTIMATE.start_main_~y~0 2)) (and (<= 5 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 32) (<= ULTIMATE.start_main_~x~0 5)) (and (<= 2 ULTIMATE.start_main_~x~0) (<= ULTIMATE.start_main_~x~0 2) (= ULTIMATE.start_main_~y~0 4)) (and (<= 4 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 16) (<= ULTIMATE.start_main_~x~0 4)) (and (<= ULTIMATE.start_main_~x~0 6) (<= 6 ULTIMATE.start_main_~x~0) (= ULTIMATE.start_main_~y~0 64))) [2020-11-30 01:58:27,047 INFO L274 CegarLoopResult]: For program point L6(lines 6 8) no Hoare annotation was computed. [2020-11-30 01:58:27,047 INFO L277 CegarLoopResult]: At program point L6-2(lines 1 22) the Hoare annotation is: true [2020-11-30 01:58:27,065 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:58:27 BoogieIcfgContainer [2020-11-30 01:58:27,065 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:58:27,066 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:58:27,066 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:58:27,066 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:58:27,066 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:55" (3/4) ... [2020-11-30 01:58:27,070 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 01:58:27,079 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2020-11-30 01:58:27,080 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-30 01:58:27,080 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 01:58:27,080 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 01:58:27,131 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_ad37a285-1e11-4062-8bdc-13272aed7b35/bin/utaipan/witness.graphml [2020-11-30 01:58:27,131 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:58:27,132 INFO L168 Benchmark]: Toolchain (without parser) took 392483.94 ms. Allocated memory was 92.3 MB in the beginning and 182.5 MB in the end (delta: 90.2 MB). Free memory was 62.0 MB in the beginning and 137.7 MB in the end (delta: -75.7 MB). Peak memory consumption was 15.2 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,133 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 92.3 MB. Free memory was 49.6 MB in the beginning and 49.6 MB in the end (delta: 39.3 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:58:27,134 INFO L168 Benchmark]: CACSL2BoogieTranslator took 312.78 ms. Allocated memory was 92.3 MB in the beginning and 151.0 MB in the end (delta: 58.7 MB). Free memory was 61.7 MB in the beginning and 128.2 MB in the end (delta: -66.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,134 INFO L168 Benchmark]: Boogie Procedure Inliner took 43.99 ms. Allocated memory is still 151.0 MB. Free memory was 128.2 MB in the beginning and 126.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,135 INFO L168 Benchmark]: Boogie Preprocessor took 21.58 ms. Allocated memory is still 151.0 MB. Free memory was 126.8 MB in the beginning and 126.1 MB in the end (delta: 689.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:58:27,136 INFO L168 Benchmark]: RCFGBuilder took 619.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 112.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,136 INFO L168 Benchmark]: TraceAbstraction took 391411.82 ms. Allocated memory was 151.0 MB in the beginning and 182.5 MB in the end (delta: 31.5 MB). Free memory was 112.1 MB in the beginning and 139.8 MB in the end (delta: -27.7 MB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,137 INFO L168 Benchmark]: Witness Printer took 65.59 ms. Allocated memory is still 182.5 MB. Free memory was 139.8 MB in the beginning and 137.7 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:58:27,140 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 92.3 MB. Free memory was 49.6 MB in the beginning and 49.6 MB in the end (delta: 39.3 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 312.78 ms. Allocated memory was 92.3 MB in the beginning and 151.0 MB in the end (delta: 58.7 MB). Free memory was 61.7 MB in the beginning and 128.2 MB in the end (delta: -66.5 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 43.99 ms. Allocated memory is still 151.0 MB. Free memory was 128.2 MB in the beginning and 126.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 21.58 ms. Allocated memory is still 151.0 MB. Free memory was 126.8 MB in the beginning and 126.1 MB in the end (delta: 689.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 619.06 ms. Allocated memory is still 151.0 MB. Free memory was 126.1 MB in the beginning and 112.8 MB in the end (delta: 13.3 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 391411.82 ms. Allocated memory was 151.0 MB in the beginning and 182.5 MB in the end (delta: 31.5 MB). Free memory was 112.1 MB in the beginning and 139.8 MB in the end (delta: -27.7 MB). Peak memory consumption was 5.5 MB. Max. memory is 16.1 GB. * Witness Printer took 65.59 ms. Allocated memory is still 182.5 MB. Free memory was 139.8 MB in the beginning and 137.7 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: - PositiveResult [Line: 3]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 16]: Loop Invariant Derived loop invariant: ((((((x == 0 && y == 1) || ((3 <= x && y == 8) && x <= 3)) || (x == 1 && y == 2)) || ((5 <= x && y == 32) && x <= 5)) || ((2 <= x && x <= 2) && y == 4)) || ((4 <= x && y == 16) && x <= 4)) || ((x <= 6 && 6 <= x) && y == 64) - InvariantResult [Line: 1]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 391.1s, OverallIterations: 5, TraceHistogramMax: 14, AutomataDifference: 228.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 18 SDtfs, 14 SDslu, 46 SDs, 0 SdLazy, 225 SolverSat, 36 SolverUnsat, 19 SolverUnknown, 0 SolverNotchecked, 38.4s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 154 GetRequests, 63 SyntacticMatches, 5 SemanticMatches, 86 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 365 ImplicationChecksByTransitivity, 347.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=19occurred in iteration=4, 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, 5 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 10 NumberOfFragments, 66 HoareAnnotationTreeSize, 2 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 28 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.3s SatisfiabilityAnalysisTime, 144.4s InterpolantComputationTime, 86 NumberOfCodeBlocks, 86 NumberOfCodeBlocksAsserted, 12 NumberOfCheckSat, 114 ConstructedInterpolants, 0 QuantifiedInterpolants, 9691 SizeOfPredicates, 5 NumberOfNonLiveVariables, 297 ConjunctsInSsa, 58 ConjunctsInUnsatCore, 13 InterpolantComputations, 1 PerfectInterpolantSequences, 162/411 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 correct! Received shutdown request...