./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i --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_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i -s /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 a16c5bc7f1ed4f9266e4e27b0a7ec7a93876c12a ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 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 02:07:15,313 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 02:07:15,316 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 02:07:15,381 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 02:07:15,382 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 02:07:15,383 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 02:07:15,386 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 02:07:15,389 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 02:07:15,398 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 02:07:15,413 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 02:07:15,414 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 02:07:15,419 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 02:07:15,419 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 02:07:15,423 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 02:07:15,425 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 02:07:15,429 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 02:07:15,430 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 02:07:15,432 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 02:07:15,440 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 02:07:15,448 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 02:07:15,452 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 02:07:15,454 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 02:07:15,456 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 02:07:15,458 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 02:07:15,468 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 02:07:15,472 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 02:07:15,472 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 02:07:15,474 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 02:07:15,475 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 02:07:15,477 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 02:07:15,477 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 02:07:15,479 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 02:07:15,481 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 02:07:15,483 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 02:07:15,484 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 02:07:15,484 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 02:07:15,485 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 02:07:15,486 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 02:07:15,486 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 02:07:15,487 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 02:07:15,488 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 02:07:15,491 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 02:07:15,543 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 02:07:15,543 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 02:07:15,545 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 02:07:15,545 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 02:07:15,545 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 02:07:15,545 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 02:07:15,546 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 02:07:15,546 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 02:07:15,546 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 02:07:15,547 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 02:07:15,548 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 02:07:15,548 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 02:07:15,549 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 02:07:15,549 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 02:07:15,549 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 02:07:15,550 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 02:07:15,550 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 02:07:15,551 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 02:07:15,551 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 02:07:15,551 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 02:07:15,551 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 02:07:15,552 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 02:07:15,552 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 02:07:15,552 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 02:07:15,552 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 02:07:15,553 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 02:07:15,553 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 02:07:15,553 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 02:07:15,554 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 02:07:15,555 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 02:07:15,556 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 02:07:15,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:07:15,557 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 02:07:15,557 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 02:07:15,558 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 02:07:15,558 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 02:07:15,558 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 02:07:15,559 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 02:07:15,559 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 02:07:15,559 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 02:07:15,560 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_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a16c5bc7f1ed4f9266e4e27b0a7ec7a93876c12a [2020-11-30 02:07:15,860 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 02:07:15,892 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 02:07:15,896 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 02:07:15,898 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 02:07:15,899 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 02:07:15,900 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/../../sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2020-11-30 02:07:15,992 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/data/3195c7372/21ed04344a26475893d4b359c3cad9f2/FLAGa1e65b4ed [2020-11-30 02:07:16,560 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 02:07:16,561 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/sv-benchmarks/c/loop-invgen/string_concat-noarr.i [2020-11-30 02:07:16,568 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/data/3195c7372/21ed04344a26475893d4b359c3cad9f2/FLAGa1e65b4ed [2020-11-30 02:07:16,928 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/data/3195c7372/21ed04344a26475893d4b359c3cad9f2 [2020-11-30 02:07:16,930 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 02:07:16,936 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 02:07:16,940 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 02:07:16,941 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 02:07:16,944 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 02:07:16,946 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:07:16" (1/1) ... [2020-11-30 02:07:16,948 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4095b663 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:16, skipping insertion in model container [2020-11-30 02:07:16,949 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:07:16" (1/1) ... [2020-11-30 02:07:16,957 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 02:07:16,974 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 02:07:17,299 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:07:17,312 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 02:07:17,341 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:07:17,368 INFO L208 MainTranslator]: Completed translation [2020-11-30 02:07:17,369 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17 WrapperNode [2020-11-30 02:07:17,369 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 02:07:17,371 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 02:07:17,372 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 02:07:17,372 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 02:07:17,382 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,392 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,420 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 02:07:17,422 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 02:07:17,422 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 02:07:17,423 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 02:07:17,434 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,434 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,448 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,448 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,452 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,461 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,471 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... [2020-11-30 02:07:17,481 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 02:07:17,482 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 02:07:17,482 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 02:07:17,482 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 02:07:17,484 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 02:07:17,573 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 02:07:17,574 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 02:07:17,574 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 02:07:17,574 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 02:07:17,982 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 02:07:17,982 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-11-30 02:07:17,984 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:07:17 BoogieIcfgContainer [2020-11-30 02:07:17,984 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 02:07:17,986 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 02:07:17,987 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 02:07:17,991 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 02:07:17,991 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 02:07:16" (1/3) ... [2020-11-30 02:07:17,992 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43f6df8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:07:17, skipping insertion in model container [2020-11-30 02:07:17,992 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:07:17" (2/3) ... [2020-11-30 02:07:17,993 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@43f6df8b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:07:17, skipping insertion in model container [2020-11-30 02:07:17,993 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:07:17" (3/3) ... [2020-11-30 02:07:17,995 INFO L111 eAbstractionObserver]: Analyzing ICFG string_concat-noarr.i [2020-11-30 02:07:18,008 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 02:07:18,014 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 02:07:18,027 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 02:07:18,063 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 02:07:18,063 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 02:07:18,063 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 02:07:18,063 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 02:07:18,064 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 02:07:18,064 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 02:07:18,064 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 02:07:18,064 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 02:07:18,084 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states. [2020-11-30 02:07:18,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 02:07:18,090 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:18,091 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:18,092 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:18,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:18,100 INFO L82 PathProgramCache]: Analyzing trace with hash -738851178, now seen corresponding path program 1 times [2020-11-30 02:07:18,111 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:18,112 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1471370407] [2020-11-30 02:07:18,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:18,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:18,264 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 02:07:18,265 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1471370407] [2020-11-30 02:07:18,266 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:07:18,267 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:07:18,268 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [975903837] [2020-11-30 02:07:18,272 INFO L461 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-11-30 02:07:18,273 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:18,290 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-11-30 02:07:18,291 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-30 02:07:18,293 INFO L87 Difference]: Start difference. First operand 15 states. Second operand 2 states. [2020-11-30 02:07:18,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:18,310 INFO L93 Difference]: Finished difference Result 26 states and 38 transitions. [2020-11-30 02:07:18,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-11-30 02:07:18,312 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 8 [2020-11-30 02:07:18,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:18,322 INFO L225 Difference]: With dead ends: 26 [2020-11-30 02:07:18,322 INFO L226 Difference]: Without dead ends: 11 [2020-11-30 02:07:18,334 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-11-30 02:07:18,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-30 02:07:18,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-30 02:07:18,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 02:07:18,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-30 02:07:18,367 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2020-11-30 02:07:18,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:18,368 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-30 02:07:18,369 INFO L482 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-11-30 02:07:18,369 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-30 02:07:18,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 02:07:18,370 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:18,371 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:18,371 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 02:07:18,372 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:18,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:18,374 INFO L82 PathProgramCache]: Analyzing trace with hash -1760993231, now seen corresponding path program 1 times [2020-11-30 02:07:18,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:18,375 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1869821698] [2020-11-30 02:07:18,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:18,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:18,599 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 02:07:18,600 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1869821698] [2020-11-30 02:07:18,600 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:07:18,600 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 02:07:18,601 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1609286808] [2020-11-30 02:07:18,602 INFO L461 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-11-30 02:07:18,602 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:18,603 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-11-30 02:07:18,604 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-11-30 02:07:18,604 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 4 states. [2020-11-30 02:07:18,687 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:18,687 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2020-11-30 02:07:18,688 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-11-30 02:07:18,688 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 10 [2020-11-30 02:07:18,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:18,689 INFO L225 Difference]: With dead ends: 21 [2020-11-30 02:07:18,689 INFO L226 Difference]: Without dead ends: 16 [2020-11-30 02:07:18,690 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 [2020-11-30 02:07:18,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-11-30 02:07:18,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 13. [2020-11-30 02:07:18,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 13 states. [2020-11-30 02:07:18,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2020-11-30 02:07:18,694 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2020-11-30 02:07:18,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:18,695 INFO L481 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2020-11-30 02:07:18,695 INFO L482 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-11-30 02:07:18,696 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2020-11-30 02:07:18,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-11-30 02:07:18,696 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:18,697 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:18,697 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 02:07:18,697 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:18,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:18,698 INFO L82 PathProgramCache]: Analyzing trace with hash 1271919414, now seen corresponding path program 1 times [2020-11-30 02:07:18,699 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:18,699 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2126999706] [2020-11-30 02:07:18,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:18,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:18,807 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2126999706] [2020-11-30 02:07:18,808 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [5019748] [2020-11-30 02:07:18,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 02:07:18,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:18,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 5 conjunts are in the unsatisfiable core [2020-11-30 02:07:18,864 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:18,922 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-30 02:07:18,927 INFO L603 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-11-30 02:07:18,955 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:18,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:18,975 INFO L603 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-11-30 02:07:19,053 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:19,053 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2098056279] [2020-11-30 02:07:19,088 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:07:19,088 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:19,095 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:19,102 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:19,103 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:19,655 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:19,822 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:07:20,074 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:07:20,461 WARN L193 SmtUtils]: Spent 340.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:07:20,833 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 31 [2020-11-30 02:07:20,836 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:20,836 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:20,836 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 8 [2020-11-30 02:07:20,837 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182645020] [2020-11-30 02:07:20,837 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 02:07:20,837 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:20,838 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 02:07:20,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2020-11-30 02:07:20,839 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand 9 states. [2020-11-30 02:07:21,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:21,024 INFO L93 Difference]: Finished difference Result 44 states and 51 transitions. [2020-11-30 02:07:21,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-11-30 02:07:21,026 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 12 [2020-11-30 02:07:21,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:21,027 INFO L225 Difference]: With dead ends: 44 [2020-11-30 02:07:21,027 INFO L226 Difference]: Without dead ends: 35 [2020-11-30 02:07:21,028 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 23 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=77, Invalid=265, Unknown=0, NotChecked=0, Total=342 [2020-11-30 02:07:21,029 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-11-30 02:07:21,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 25. [2020-11-30 02:07:21,033 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-11-30 02:07:21,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 28 transitions. [2020-11-30 02:07:21,034 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 28 transitions. Word has length 12 [2020-11-30 02:07:21,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:21,034 INFO L481 AbstractCegarLoop]: Abstraction has 25 states and 28 transitions. [2020-11-30 02:07:21,035 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 02:07:21,035 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 28 transitions. [2020-11-30 02:07:21,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-11-30 02:07:21,036 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:21,036 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:21,259 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-30 02:07:21,259 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:21,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:21,260 INFO L82 PathProgramCache]: Analyzing trace with hash -1483416379, now seen corresponding path program 2 times [2020-11-30 02:07:21,260 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:21,260 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1257452562] [2020-11-30 02:07:21,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:21,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:21,354 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:21,355 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1257452562] [2020-11-30 02:07:21,355 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1758133529] [2020-11-30 02:07:21,355 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 02:07:21,408 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2020-11-30 02:07:21,408 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:21,410 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-11-30 02:07:21,411 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:21,547 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:21,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:21,792 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:21,792 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1815273638] [2020-11-30 02:07:21,795 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:07:21,795 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:21,796 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:21,796 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:21,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:22,118 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:22,278 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:07:22,421 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 41 [2020-11-30 02:07:22,568 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:07:22,985 WARN L193 SmtUtils]: Spent 360.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:07:23,395 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 31 [2020-11-30 02:07:23,396 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:23,397 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:23,397 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2020-11-30 02:07:23,397 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2069418019] [2020-11-30 02:07:23,398 INFO L461 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-11-30 02:07:23,398 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:23,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-11-30 02:07:23,399 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=337, Unknown=0, NotChecked=0, Total=462 [2020-11-30 02:07:23,399 INFO L87 Difference]: Start difference. First operand 25 states and 28 transitions. Second operand 15 states. [2020-11-30 02:07:23,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:23,739 INFO L93 Difference]: Finished difference Result 88 states and 104 transitions. [2020-11-30 02:07:23,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-11-30 02:07:23,740 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 18 [2020-11-30 02:07:23,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:23,743 INFO L225 Difference]: With dead ends: 88 [2020-11-30 02:07:23,743 INFO L226 Difference]: Without dead ends: 73 [2020-11-30 02:07:23,744 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 213 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=185, Invalid=571, Unknown=0, NotChecked=0, Total=756 [2020-11-30 02:07:23,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-11-30 02:07:23,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-11-30 02:07:23,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-11-30 02:07:23,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 52 transitions. [2020-11-30 02:07:23,753 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 52 transitions. Word has length 18 [2020-11-30 02:07:23,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:23,754 INFO L481 AbstractCegarLoop]: Abstraction has 46 states and 52 transitions. [2020-11-30 02:07:23,754 INFO L482 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-11-30 02:07:23,754 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 52 transitions. [2020-11-30 02:07:23,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-11-30 02:07:23,755 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:23,755 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:23,956 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,3 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:23,956 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:23,956 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:23,956 INFO L82 PathProgramCache]: Analyzing trace with hash -1966986717, now seen corresponding path program 3 times [2020-11-30 02:07:23,957 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:23,957 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477373775] [2020-11-30 02:07:23,957 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:24,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:24,230 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:24,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477373775] [2020-11-30 02:07:24,230 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793509902] [2020-11-30 02:07:24,230 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 02:07:24,310 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:07:24,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:24,311 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 14 conjunts are in the unsatisfiable core [2020-11-30 02:07:24,314 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:24,565 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:24,566 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:25,041 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 110 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:25,041 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749250953] [2020-11-30 02:07:25,048 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:07:25,048 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:25,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:25,049 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:25,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:25,331 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:25,495 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:07:25,796 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:07:26,296 WARN L193 SmtUtils]: Spent 426.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:07:26,682 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 38 DAG size of output: 31 [2020-11-30 02:07:26,683 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:26,684 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:26,684 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2020-11-30 02:07:26,684 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [421570541] [2020-11-30 02:07:26,685 INFO L461 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-11-30 02:07:26,685 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:26,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-11-30 02:07:26,687 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=751, Unknown=0, NotChecked=0, Total=1122 [2020-11-30 02:07:26,687 INFO L87 Difference]: Start difference. First operand 46 states and 52 transitions. Second operand 27 states. [2020-11-30 02:07:27,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:27,588 INFO L93 Difference]: Finished difference Result 208 states and 242 transitions. [2020-11-30 02:07:27,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-11-30 02:07:27,588 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 30 [2020-11-30 02:07:27,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:27,591 INFO L225 Difference]: With dead ends: 208 [2020-11-30 02:07:27,591 INFO L226 Difference]: Without dead ends: 181 [2020-11-30 02:07:27,595 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 68 SyntacticMatches, 1 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 513 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=563, Invalid=1507, Unknown=0, NotChecked=0, Total=2070 [2020-11-30 02:07:27,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 181 states. [2020-11-30 02:07:27,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 181 to 88. [2020-11-30 02:07:27,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-11-30 02:07:27,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 100 transitions. [2020-11-30 02:07:27,607 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 100 transitions. Word has length 30 [2020-11-30 02:07:27,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:27,607 INFO L481 AbstractCegarLoop]: Abstraction has 88 states and 100 transitions. [2020-11-30 02:07:27,607 INFO L482 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-11-30 02:07:27,607 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 100 transitions. [2020-11-30 02:07:27,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-11-30 02:07:27,609 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:27,610 INFO L422 BasicCegarLoop]: trace histogram [23, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:27,817 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2020-11-30 02:07:27,818 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:27,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:27,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1936527905, now seen corresponding path program 4 times [2020-11-30 02:07:27,819 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:27,819 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [362135433] [2020-11-30 02:07:27,819 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:27,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:28,519 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:28,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [362135433] [2020-11-30 02:07:28,520 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [923379080] [2020-11-30 02:07:28,520 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/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 02:07:28,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:28,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 26 conjunts are in the unsatisfiable core [2020-11-30 02:07:28,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:28,720 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:28,720 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:29,843 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:29,844 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [224065294] [2020-11-30 02:07:29,846 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:07:29,846 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:29,847 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:29,847 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:29,847 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:30,076 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:30,241 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:07:30,377 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 41 [2020-11-30 02:07:30,496 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:07:30,872 WARN L193 SmtUtils]: Spent 310.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:07:31,040 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 27 [2020-11-30 02:07:31,285 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:31,285 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:31,285 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2020-11-30 02:07:31,285 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634545208] [2020-11-30 02:07:31,286 INFO L461 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-11-30 02:07:31,286 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:31,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-11-30 02:07:31,290 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1295, Invalid=2011, Unknown=0, NotChecked=0, Total=3306 [2020-11-30 02:07:31,290 INFO L87 Difference]: Start difference. First operand 88 states and 100 transitions. Second operand 51 states. [2020-11-30 02:07:32,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:32,937 INFO L93 Difference]: Finished difference Result 556 states and 626 transitions. [2020-11-30 02:07:32,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2020-11-30 02:07:32,941 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 54 [2020-11-30 02:07:32,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:32,945 INFO L225 Difference]: With dead ends: 556 [2020-11-30 02:07:32,946 INFO L226 Difference]: Without dead ends: 505 [2020-11-30 02:07:32,950 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 209 GetRequests, 128 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1329 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=1967, Invalid=4675, Unknown=0, NotChecked=0, Total=6642 [2020-11-30 02:07:32,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 505 states. [2020-11-30 02:07:32,970 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 505 to 172. [2020-11-30 02:07:32,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 172 states. [2020-11-30 02:07:32,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 196 transitions. [2020-11-30 02:07:32,977 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 196 transitions. Word has length 54 [2020-11-30 02:07:32,977 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:32,977 INFO L481 AbstractCegarLoop]: Abstraction has 172 states and 196 transitions. [2020-11-30 02:07:32,977 INFO L482 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-11-30 02:07:32,978 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 196 transitions. [2020-11-30 02:07:32,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-11-30 02:07:32,994 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:32,994 INFO L422 BasicCegarLoop]: trace histogram [47, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:33,215 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:33,215 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:33,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:33,216 INFO L82 PathProgramCache]: Analyzing trace with hash -1750132393, now seen corresponding path program 5 times [2020-11-30 02:07:33,216 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:33,216 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1833047700] [2020-11-30 02:07:33,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:33,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:35,052 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:35,053 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1833047700] [2020-11-30 02:07:35,053 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [985703737] [2020-11-30 02:07:35,053 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/z3 Starting monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:35,287 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 47 check-sat command(s) [2020-11-30 02:07:35,287 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:35,290 INFO L263 TraceCheckSpWp]: Trace formula consists of 413 conjuncts, 50 conjunts are in the unsatisfiable core [2020-11-30 02:07:35,295 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:35,472 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:35,472 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:07:40,144 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 2162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:40,144 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2023449797] [2020-11-30 02:07:40,147 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:07:40,147 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:07:40,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:07:40,148 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:07:40,148 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:07:40,376 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:07:40,567 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:07:40,804 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:07:41,386 WARN L193 SmtUtils]: Spent 378.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:07:41,738 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:07:41,738 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:07:41,738 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 98 [2020-11-30 02:07:41,738 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1043398538] [2020-11-30 02:07:41,739 INFO L461 AbstractCegarLoop]: Interpolant automaton has 99 states [2020-11-30 02:07:41,739 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:07:41,741 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 99 interpolants. [2020-11-30 02:07:41,745 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=4871, Invalid=6259, Unknown=0, NotChecked=0, Total=11130 [2020-11-30 02:07:41,745 INFO L87 Difference]: Start difference. First operand 172 states and 196 transitions. Second operand 99 states. [2020-11-30 02:07:48,054 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:07:48,055 INFO L93 Difference]: Finished difference Result 1684 states and 1826 transitions. [2020-11-30 02:07:48,055 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 144 states. [2020-11-30 02:07:48,055 INFO L78 Accepts]: Start accepts. Automaton has 99 states. Word has length 102 [2020-11-30 02:07:48,056 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:07:48,066 INFO L225 Difference]: With dead ends: 1684 [2020-11-30 02:07:48,067 INFO L226 Difference]: Without dead ends: 1585 [2020-11-30 02:07:48,076 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 401 GetRequests, 248 SyntacticMatches, 1 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3825 ImplicationChecksByTransitivity, 10.4s TimeCoverageRelationStatistics Valid=7367, Invalid=16195, Unknown=0, NotChecked=0, Total=23562 [2020-11-30 02:07:48,078 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1585 states. [2020-11-30 02:07:48,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1585 to 340. [2020-11-30 02:07:48,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 340 states. [2020-11-30 02:07:48,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 340 states to 340 states and 388 transitions. [2020-11-30 02:07:48,109 INFO L78 Accepts]: Start accepts. Automaton has 340 states and 388 transitions. Word has length 102 [2020-11-30 02:07:48,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:07:48,110 INFO L481 AbstractCegarLoop]: Abstraction has 340 states and 388 transitions. [2020-11-30 02:07:48,111 INFO L482 AbstractCegarLoop]: Interpolant automaton has 99 states. [2020-11-30 02:07:48,111 INFO L276 IsEmpty]: Start isEmpty. Operand 340 states and 388 transitions. [2020-11-30 02:07:48,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2020-11-30 02:07:48,118 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:07:48,119 INFO L422 BasicCegarLoop]: trace histogram [95, 94, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:07:48,332 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable70,6 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:48,332 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:07:48,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:07:48,333 INFO L82 PathProgramCache]: Analyzing trace with hash 1054998599, now seen corresponding path program 6 times [2020-11-30 02:07:48,333 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:07:48,333 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497099612] [2020-11-30 02:07:48,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:07:48,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:07:54,257 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:54,257 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497099612] [2020-11-30 02:07:54,257 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [46198044] [2020-11-30 02:07:54,257 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/z3 Starting monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:07:54,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:07:54,416 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:07:54,420 INFO L263 TraceCheckSpWp]: Trace formula consists of 797 conjuncts, 98 conjunts are in the unsatisfiable core [2020-11-30 02:07:54,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:07:54,695 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:07:54,696 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:08:11,014 INFO L134 CoverageAnalysis]: Checked inductivity of 8930 backedges. 0 proven. 8930 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:08:11,014 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [477237692] [2020-11-30 02:08:11,017 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:08:11,017 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:08:11,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:08:11,018 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:08:11,019 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:08:11,244 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:08:11,489 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 39 DAG size of output: 31 [2020-11-30 02:08:11,616 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 41 [2020-11-30 02:08:11,760 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 51 DAG size of output: 47 [2020-11-30 02:08:12,198 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 75 DAG size of output: 61 [2020-11-30 02:08:12,680 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:08:12,680 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:08:12,681 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 97, 97] total 194 [2020-11-30 02:08:12,681 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572333553] [2020-11-30 02:08:12,682 INFO L461 AbstractCegarLoop]: Interpolant automaton has 195 states [2020-11-30 02:08:12,682 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:08:12,686 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 195 interpolants. [2020-11-30 02:08:12,692 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18935, Invalid=21667, Unknown=0, NotChecked=0, Total=40602 [2020-11-30 02:08:12,693 INFO L87 Difference]: Start difference. First operand 340 states and 388 transitions. Second operand 195 states. [2020-11-30 02:08:43,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:08:43,752 INFO L93 Difference]: Finished difference Result 5668 states and 5954 transitions. [2020-11-30 02:08:43,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 288 states. [2020-11-30 02:08:43,752 INFO L78 Accepts]: Start accepts. Automaton has 195 states. Word has length 198 [2020-11-30 02:08:43,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:08:43,785 INFO L225 Difference]: With dead ends: 5668 [2020-11-30 02:08:43,786 INFO L226 Difference]: Without dead ends: 5473 [2020-11-30 02:08:43,798 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 785 GetRequests, 488 SyntacticMatches, 1 SemanticMatches, 296 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12273 ImplicationChecksByTransitivity, 33.4s TimeCoverageRelationStatistics Valid=28535, Invalid=59971, Unknown=0, NotChecked=0, Total=88506 [2020-11-30 02:08:43,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5473 states. [2020-11-30 02:08:43,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5473 to 676. [2020-11-30 02:08:43,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 676 states. [2020-11-30 02:08:43,853 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 676 states to 676 states and 772 transitions. [2020-11-30 02:08:43,853 INFO L78 Accepts]: Start accepts. Automaton has 676 states and 772 transitions. Word has length 198 [2020-11-30 02:08:43,854 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:08:43,854 INFO L481 AbstractCegarLoop]: Abstraction has 676 states and 772 transitions. [2020-11-30 02:08:43,854 INFO L482 AbstractCegarLoop]: Interpolant automaton has 195 states. [2020-11-30 02:08:43,854 INFO L276 IsEmpty]: Start isEmpty. Operand 676 states and 772 transitions. [2020-11-30 02:08:43,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-11-30 02:08:43,870 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:08:43,870 INFO L422 BasicCegarLoop]: trace histogram [191, 190, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:08:44,070 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable87,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:08:44,071 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:08:44,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:08:44,071 INFO L82 PathProgramCache]: Analyzing trace with hash -911077849, now seen corresponding path program 7 times [2020-11-30 02:08:44,072 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:08:44,072 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [110595522] [2020-11-30 02:08:44,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:08:44,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:09:08,104 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 0 proven. 36290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:09:08,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [110595522] [2020-11-30 02:09:08,104 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [651326929] [2020-11-30 02:09:08,104 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/z3 Starting monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:09:08,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:09:08,435 INFO L263 TraceCheckSpWp]: Trace formula consists of 1565 conjuncts, 192 conjunts are in the unsatisfiable core [2020-11-30 02:09:08,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:09:52,718 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:09:52,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:10:11,738 INFO L134 CoverageAnalysis]: Checked inductivity of 36290 backedges. 36290 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:10:11,739 INFO L219 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2020-11-30 02:10:11,739 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [193, 193] imperfect sequences [193] total 475 [2020-11-30 02:10:11,740 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2022112036] [2020-11-30 02:10:11,741 INFO L461 AbstractCegarLoop]: Interpolant automaton has 283 states [2020-11-30 02:10:11,741 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:10:11,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 283 interpolants. [2020-11-30 02:10:11,761 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2020-11-30 02:10:11,761 INFO L87 Difference]: Start difference. First operand 676 states and 772 transitions. Second operand 283 states. [2020-11-30 02:10:20,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:10:20,090 INFO L93 Difference]: Finished difference Result 27961 states and 28147 transitions. [2020-11-30 02:10:20,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 193 states. [2020-11-30 02:10:20,091 INFO L78 Accepts]: Start accepts. Automaton has 283 states. Word has length 390 [2020-11-30 02:10:20,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:10:20,099 INFO L225 Difference]: With dead ends: 27961 [2020-11-30 02:10:20,099 INFO L226 Difference]: Without dead ends: 1203 [2020-11-30 02:10:20,134 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 971 GetRequests, 498 SyntacticMatches, 0 SemanticMatches, 473 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 87780 ImplicationChecksByTransitivity, 85.7s TimeCoverageRelationStatistics Valid=58432, Invalid=166718, Unknown=0, NotChecked=0, Total=225150 [2020-11-30 02:10:20,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1203 states. [2020-11-30 02:10:20,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1203 to 1183. [2020-11-30 02:10:20,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1183 states. [2020-11-30 02:10:20,167 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1183 states to 1183 states and 1191 transitions. [2020-11-30 02:10:20,167 INFO L78 Accepts]: Start accepts. Automaton has 1183 states and 1191 transitions. Word has length 390 [2020-11-30 02:10:20,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:10:20,167 INFO L481 AbstractCegarLoop]: Abstraction has 1183 states and 1191 transitions. [2020-11-30 02:10:20,168 INFO L482 AbstractCegarLoop]: Interpolant automaton has 283 states. [2020-11-30 02:10:20,168 INFO L276 IsEmpty]: Start isEmpty. Operand 1183 states and 1191 transitions. [2020-11-30 02:10:20,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2020-11-30 02:10:20,177 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:10:20,177 INFO L422 BasicCegarLoop]: trace histogram [100, 99, 92, 91, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:10:20,403 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable104,8 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:10:20,404 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:10:20,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:10:20,404 INFO L82 PathProgramCache]: Analyzing trace with hash -2146512423, now seen corresponding path program 1 times [2020-11-30 02:10:20,404 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:10:20,404 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [861116659] [2020-11-30 02:10:20,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:10:20,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:10:47,376 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:10:47,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [861116659] [2020-11-30 02:10:47,377 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205080206] [2020-11-30 02:10:47,377 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/z3 Starting monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:10:47,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:10:47,672 INFO L263 TraceCheckSpWp]: Trace formula consists of 1383 conjuncts, 194 conjunts are in the unsatisfiable core [2020-11-30 02:10:47,682 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:10:48,107 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:10:48,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:10:51,210 INFO L134 CoverageAnalysis]: Checked inductivity of 18272 backedges. 0 proven. 18272 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:10:51,211 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [523424135] [2020-11-30 02:10:51,213 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2020-11-30 02:10:51,214 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:10:51,214 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:10:51,214 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:10:51,215 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:10:51,518 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:10:52,768 WARN L193 SmtUtils]: Spent 415.00 ms on a formula simplification. DAG size of input: 68 DAG size of output: 55 [2020-11-30 02:10:53,875 WARN L193 SmtUtils]: Spent 228.00 ms on a formula simplification. DAG size of input: 45 DAG size of output: 30 [2020-11-30 02:10:54,827 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:10:54,827 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:10:54,827 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [193, 193, 193] total 204 [2020-11-30 02:10:54,827 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55675875] [2020-11-30 02:10:54,828 INFO L461 AbstractCegarLoop]: Interpolant automaton has 205 states [2020-11-30 02:10:54,828 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:10:54,830 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 205 interpolants. [2020-11-30 02:10:54,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20536, Invalid=24620, Unknown=0, NotChecked=0, Total=45156 [2020-11-30 02:10:54,832 INFO L87 Difference]: Start difference. First operand 1183 states and 1191 transitions. Second operand 205 states. [2020-11-30 02:11:06,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:11:06,709 INFO L93 Difference]: Finished difference Result 2334 states and 2469 transitions. [2020-11-30 02:11:06,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 211 states. [2020-11-30 02:11:06,710 INFO L78 Accepts]: Start accepts. Automaton has 205 states. Word has length 390 [2020-11-30 02:11:06,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:11:06,712 INFO L225 Difference]: With dead ends: 2334 [2020-11-30 02:11:06,712 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 02:11:06,716 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 1370 GetRequests, 1148 SyntacticMatches, 2 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2777 ImplicationChecksByTransitivity, 33.8s TimeCoverageRelationStatistics Valid=20662, Invalid=28400, Unknown=0, NotChecked=0, Total=49062 [2020-11-30 02:11:06,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 02:11:06,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 02:11:06,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 02:11:06,717 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 02:11:06,717 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 390 [2020-11-30 02:11:06,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:11:06,717 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 02:11:06,718 INFO L482 AbstractCegarLoop]: Interpolant automaton has 205 states. [2020-11-30 02:11:06,718 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 02:11:06,718 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 02:11:06,935 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable105 [2020-11-30 02:11:06,936 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point L35-2(lines 34 38) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point L35-3(lines 24 42) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 12) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point L12(line 12) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point L12-2(line 12) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point L12-3(line 12) no Hoare annotation was computed. [2020-11-30 02:11:06,946 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-30 02:11:06,947 INFO L274 CegarLoopResult]: For program point L29(lines 29 31) no Hoare annotation was computed. [2020-11-30 02:11:06,947 INFO L274 CegarLoopResult]: For program point L29-2(lines 28 31) no Hoare annotation was computed. [2020-11-30 02:11:06,947 INFO L274 CegarLoopResult]: For program point L29-3(lines 24 42) no Hoare annotation was computed. [2020-11-30 02:11:06,947 INFO L274 CegarLoopResult]: For program point L18(lines 18 20) no Hoare annotation was computed. [2020-11-30 02:11:06,947 INFO L277 CegarLoopResult]: At program point L18-2(lines 17 22) the Hoare annotation is: true [2020-11-30 02:11:06,947 INFO L277 CegarLoopResult]: At program point L39(lines 24 42) the Hoare annotation is: true [2020-11-30 02:11:06,947 INFO L274 CegarLoopResult]: For program point L35(lines 35 38) no Hoare annotation was computed. [2020-11-30 02:11:06,953 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 02:11:06 BoogieIcfgContainer [2020-11-30 02:11:06,953 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 02:11:06,954 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 02:11:06,954 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 02:11:06,954 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 02:11:06,954 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:07:17" (3/4) ... [2020-11-30 02:11:06,962 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 02:11:06,970 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2020-11-30 02:11:06,970 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 4 nodes and edges [2020-11-30 02:11:06,970 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-30 02:11:06,971 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 02:11:07,005 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_12e4cbb1-47bf-4206-9e71-3a38988fd15d/bin/utaipan/witness.graphml [2020-11-30 02:11:07,005 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 02:11:07,006 INFO L168 Benchmark]: Toolchain (without parser) took 230069.76 ms. Allocated memory was 100.7 MB in the beginning and 977.3 MB in the end (delta: 876.6 MB). Free memory was 64.3 MB in the beginning and 360.1 MB in the end (delta: -295.8 MB). Peak memory consumption was 581.6 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,007 INFO L168 Benchmark]: CDTParser took 0.29 ms. Allocated memory is still 100.7 MB. Free memory was 70.7 MB in the beginning and 70.7 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:11:07,007 INFO L168 Benchmark]: CACSL2BoogieTranslator took 429.95 ms. Allocated memory is still 100.7 MB. Free memory was 64.2 MB in the beginning and 75.9 MB in the end (delta: -11.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,007 INFO L168 Benchmark]: Boogie Procedure Inliner took 48.83 ms. Allocated memory is still 100.7 MB. Free memory was 75.9 MB in the beginning and 74.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,008 INFO L168 Benchmark]: Boogie Preprocessor took 58.83 ms. Allocated memory is still 100.7 MB. Free memory was 74.3 MB in the beginning and 73.4 MB in the end (delta: 893.2 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:11:07,008 INFO L168 Benchmark]: RCFGBuilder took 502.73 ms. Allocated memory is still 100.7 MB. Free memory was 73.4 MB in the beginning and 59.1 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,009 INFO L168 Benchmark]: TraceAbstraction took 228967.00 ms. Allocated memory was 100.7 MB in the beginning and 977.3 MB in the end (delta: 876.6 MB). Free memory was 58.6 MB in the beginning and 363.3 MB in the end (delta: -304.6 MB). Peak memory consumption was 573.8 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,009 INFO L168 Benchmark]: Witness Printer took 51.36 ms. Allocated memory is still 977.3 MB. Free memory was 362.2 MB in the beginning and 360.1 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:11:07,011 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.29 ms. Allocated memory is still 100.7 MB. Free memory was 70.7 MB in the beginning and 70.7 MB in the end (delta: 31.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 429.95 ms. Allocated memory is still 100.7 MB. Free memory was 64.2 MB in the beginning and 75.9 MB in the end (delta: -11.8 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 48.83 ms. Allocated memory is still 100.7 MB. Free memory was 75.9 MB in the beginning and 74.3 MB in the end (delta: 1.7 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 58.83 ms. Allocated memory is still 100.7 MB. Free memory was 74.3 MB in the beginning and 73.4 MB in the end (delta: 893.2 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 502.73 ms. Allocated memory is still 100.7 MB. Free memory was 73.4 MB in the beginning and 59.1 MB in the end (delta: 14.3 MB). Peak memory consumption was 14.7 MB. Max. memory is 16.1 GB. * TraceAbstraction took 228967.00 ms. Allocated memory was 100.7 MB in the beginning and 977.3 MB in the end (delta: 876.6 MB). Free memory was 58.6 MB in the beginning and 363.3 MB in the end (delta: -304.6 MB). Peak memory consumption was 573.8 MB. Max. memory is 16.1 GB. * Witness Printer took 51.36 ms. Allocated memory is still 977.3 MB. Free memory was 362.2 MB in the beginning and 360.1 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: 12]: 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: 17]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 15 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 228.8s, OverallIterations: 10, TraceHistogramMax: 191, AutomataDifference: 60.9s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 262 SDtfs, 21008 SDslu, 1896 SDs, 0 SdLazy, 3437 SolverSat, 8694 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 8.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 3961 GetRequests, 2642 SyntacticMatches, 8 SemanticMatches, 1311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 108799 ImplicationChecksByTransitivity, 172.6s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1183occurred in iteration=9, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 10 MinimizatonAttempts, 6528 StatesRemovedByMinimization, 8 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 2 LocationsWithAnnotation, 2 PreInvPairs, 4 NumberOfFragments, 2 HoareAnnotationTreeSize, 2 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 2 FomulaSimplificationsInter, 0 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 1.9s SatisfiabilityAnalysisTime, 149.4s InterpolantComputationTime, 2406 NumberOfCodeBlocks, 2406 NumberOfCodeBlocksAsserted, 70 NumberOfCheckSat, 3574 ConstructedInterpolants, 0 QuantifiedInterpolants, 3322443 SizeOfPredicates, 22 NumberOfNonLiveVariables, 4634 ConjunctsInSsa, 587 ConjunctsInUnsatCore, 26 InterpolantComputations, 4 PerfectInterpolantSequences, 72580/198876 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...