./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_4.c -s /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 1f0612232c1c27f632e5ebc1ac9944571433fe3b ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................... 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 02:56:50,932 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 02:56:50,934 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 02:56:50,968 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 02:56:50,969 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 02:56:50,971 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 02:56:50,973 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 02:56:50,975 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 02:56:50,978 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 02:56:50,979 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 02:56:50,981 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 02:56:50,983 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 02:56:50,983 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 02:56:50,985 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 02:56:50,987 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 02:56:50,989 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 02:56:50,990 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 02:56:50,991 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 02:56:50,994 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 02:56:50,997 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 02:56:51,003 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 02:56:51,010 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 02:56:51,011 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 02:56:51,012 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 02:56:51,020 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 02:56:51,020 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 02:56:51,020 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 02:56:51,028 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 02:56:51,029 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 02:56:51,030 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 02:56:51,031 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 02:56:51,032 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 02:56:51,034 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 02:56:51,036 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 02:56:51,038 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 02:56:51,038 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 02:56:51,039 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 02:56:51,039 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 02:56:51,040 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 02:56:51,041 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 02:56:51,042 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 02:56:51,045 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 02:56:51,101 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 02:56:51,102 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 02:56:51,103 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 02:56:51,103 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 02:56:51,103 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 02:56:51,103 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 02:56:51,104 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 02:56:51,104 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 02:56:51,104 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 02:56:51,104 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 02:56:51,105 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 02:56:51,105 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 02:56:51,105 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 02:56:51,105 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 02:56:51,106 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 02:56:51,106 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 02:56:51,107 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 02:56:51,107 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 02:56:51,107 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 02:56:51,107 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 02:56:51,108 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 02:56:51,108 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 02:56:51,108 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 02:56:51,108 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 02:56:51,109 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 02:56:51,109 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 02:56:51,109 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 02:56:51,109 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 02:56:51,110 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 02:56:51,110 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 02:56:51,110 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 02:56:51,110 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:56:51,111 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 02:56:51,111 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 02:56:51,111 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 02:56:51,111 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 02:56:51,112 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 02:56:51,112 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 02:56:51,112 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 02:56:51,112 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 02:56:51,113 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_3732897f-d0eb-4d6d-af61-9b6d201454a8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1f0612232c1c27f632e5ebc1ac9944571433fe3b [2020-11-30 02:56:51,396 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 02:56:51,421 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 02:56:51,430 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 02:56:51,431 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 02:56:51,433 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 02:56:51,435 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_4.c [2020-11-30 02:56:51,525 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/data/fc84403c7/f87da22e6e174efc87462e7b2c770121/FLAG83454db04 [2020-11-30 02:56:52,002 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 02:56:52,003 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/sv-benchmarks/c/loop-simple/nested_4.c [2020-11-30 02:56:52,024 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/data/fc84403c7/f87da22e6e174efc87462e7b2c770121/FLAG83454db04 [2020-11-30 02:56:52,397 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/data/fc84403c7/f87da22e6e174efc87462e7b2c770121 [2020-11-30 02:56:52,399 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 02:56:52,401 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 02:56:52,402 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 02:56:52,403 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 02:56:52,406 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 02:56:52,407 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,409 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@442ab063 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52, skipping insertion in model container [2020-11-30 02:56:52,410 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,419 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 02:56:52,436 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 02:56:52,622 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:56:52,638 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 02:56:52,663 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:56:52,679 INFO L208 MainTranslator]: Completed translation [2020-11-30 02:56:52,680 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52 WrapperNode [2020-11-30 02:56:52,680 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 02:56:52,684 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 02:56:52,685 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 02:56:52,685 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 02:56:52,694 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,702 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,725 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 02:56:52,726 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 02:56:52,726 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 02:56:52,727 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 02:56:52,736 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,736 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,742 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,742 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,745 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,749 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,751 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... [2020-11-30 02:56:52,757 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 02:56:52,758 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 02:56:52,758 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 02:56:52,758 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 02:56:52,760 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:56:52,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 02:56:52,828 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 02:56:52,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 02:56:52,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 02:56:53,242 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 02:56:53,243 INFO L298 CfgBuilder]: Removed 10 assume(true) statements. [2020-11-30 02:56:53,245 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:56:53 BoogieIcfgContainer [2020-11-30 02:56:53,245 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 02:56:53,247 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 02:56:53,247 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 02:56:53,251 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 02:56:53,251 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 02:56:52" (1/3) ... [2020-11-30 02:56:53,252 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338a6756 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:56:53, skipping insertion in model container [2020-11-30 02:56:53,252 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:56:52" (2/3) ... [2020-11-30 02:56:53,253 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@338a6756 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:56:53, skipping insertion in model container [2020-11-30 02:56:53,253 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:56:53" (3/3) ... [2020-11-30 02:56:53,255 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_4.c [2020-11-30 02:56:53,266 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 02:56:53,271 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 02:56:53,286 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 02:56:53,327 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 02:56:53,329 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 02:56:53,329 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 02:56:53,329 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 02:56:53,330 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 02:56:53,330 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 02:56:53,330 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 02:56:53,330 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 02:56:53,343 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states. [2020-11-30 02:56:53,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 02:56:53,348 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:53,349 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 02:56:53,349 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:53,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:53,365 INFO L82 PathProgramCache]: Analyzing trace with hash 2931818, now seen corresponding path program 1 times [2020-11-30 02:56:53,375 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:53,376 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967164331] [2020-11-30 02:56:53,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:53,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:53,588 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 02:56:53,589 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967164331] [2020-11-30 02:56:53,589 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:56:53,590 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:56:53,590 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384347145] [2020-11-30 02:56:53,598 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:56:53,599 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:53,619 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:56:53,620 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:53,623 INFO L87 Difference]: Start difference. First operand 10 states. Second operand 3 states. [2020-11-30 02:56:53,683 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:53,683 INFO L93 Difference]: Finished difference Result 19 states and 27 transitions. [2020-11-30 02:56:53,685 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:56:53,687 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-30 02:56:53,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:56:53,708 INFO L225 Difference]: With dead ends: 19 [2020-11-30 02:56:53,721 INFO L226 Difference]: Without dead ends: 12 [2020-11-30 02:56:53,725 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:53,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-30 02:56:53,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 9. [2020-11-30 02:56:53,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-30 02:56:53,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2020-11-30 02:56:53,767 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 4 [2020-11-30 02:56:53,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:56:53,768 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2020-11-30 02:56:53,768 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:56:53,769 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2020-11-30 02:56:53,769 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-30 02:56:53,769 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:53,769 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-30 02:56:53,770 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 02:56:53,771 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:53,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:53,775 INFO L82 PathProgramCache]: Analyzing trace with hash -1535027383, now seen corresponding path program 1 times [2020-11-30 02:56:53,775 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:53,776 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [977684439] [2020-11-30 02:56:53,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:53,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:53,863 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:53,863 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [977684439] [2020-11-30 02:56:53,864 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:56:53,864 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 02:56:53,864 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904205198] [2020-11-30 02:56:53,865 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:56:53,866 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:53,866 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:56:53,867 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:53,867 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand 3 states. [2020-11-30 02:56:53,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:53,902 INFO L93 Difference]: Finished difference Result 19 states and 28 transitions. [2020-11-30 02:56:53,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:56:53,904 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-30 02:56:53,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:56:53,904 INFO L225 Difference]: With dead ends: 19 [2020-11-30 02:56:53,905 INFO L226 Difference]: Without dead ends: 12 [2020-11-30 02:56:53,906 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:53,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-30 02:56:53,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 10. [2020-11-30 02:56:53,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 10 states. [2020-11-30 02:56:53,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2020-11-30 02:56:53,909 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 6 [2020-11-30 02:56:53,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:56:53,910 INFO L481 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2020-11-30 02:56:53,910 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:56:53,910 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2020-11-30 02:56:53,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 02:56:53,911 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:53,911 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:56:53,911 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 02:56:53,911 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:53,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:53,912 INFO L82 PathProgramCache]: Analyzing trace with hash 673447229, now seen corresponding path program 1 times [2020-11-30 02:56:53,912 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:53,912 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [448407807] [2020-11-30 02:56:53,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:53,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:53,973 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:53,974 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [448407807] [2020-11-30 02:56:53,974 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:56:53,974 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 02:56:53,975 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [485615298] [2020-11-30 02:56:53,975 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:56:53,975 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:53,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:56:53,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:53,976 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. Second operand 3 states. [2020-11-30 02:56:54,009 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:54,009 INFO L93 Difference]: Finished difference Result 20 states and 28 transitions. [2020-11-30 02:56:54,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:56:54,012 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 8 [2020-11-30 02:56:54,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:56:54,012 INFO L225 Difference]: With dead ends: 20 [2020-11-30 02:56:54,013 INFO L226 Difference]: Without dead ends: 12 [2020-11-30 02:56:54,013 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:54,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-30 02:56:54,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2020-11-30 02:56:54,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 02:56:54,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2020-11-30 02:56:54,017 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 8 [2020-11-30 02:56:54,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:56:54,017 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2020-11-30 02:56:54,018 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:56:54,018 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2020-11-30 02:56:54,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 02:56:54,018 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:54,018 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:56:54,019 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-11-30 02:56:54,019 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:54,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:54,020 INFO L82 PathProgramCache]: Analyzing trace with hash -1840744305, now seen corresponding path program 1 times [2020-11-30 02:56:54,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:54,020 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [249144379] [2020-11-30 02:56:54,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:54,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:54,082 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:54,083 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [249144379] [2020-11-30 02:56:54,083 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:56:54,084 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 02:56:54,084 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288760483] [2020-11-30 02:56:54,084 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:56:54,085 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:54,085 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:56:54,086 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:54,086 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand 3 states. [2020-11-30 02:56:54,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:54,107 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2020-11-30 02:56:54,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:56:54,108 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-11-30 02:56:54,108 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:56:54,109 INFO L225 Difference]: With dead ends: 21 [2020-11-30 02:56:54,109 INFO L226 Difference]: Without dead ends: 12 [2020-11-30 02:56:54,109 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:56:54,110 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-11-30 02:56:54,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-11-30 02:56:54,112 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-11-30 02:56:54,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2020-11-30 02:56:54,115 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 10 [2020-11-30 02:56:54,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:56:54,116 INFO L481 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2020-11-30 02:56:54,116 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:56:54,116 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2020-11-30 02:56:54,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-11-30 02:56:54,117 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:54,117 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:56:54,117 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-11-30 02:56:54,118 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:54,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:54,120 INFO L82 PathProgramCache]: Analyzing trace with hash 2089132461, now seen corresponding path program 1 times [2020-11-30 02:56:54,121 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:54,121 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1792776041] [2020-11-30 02:56:54,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:54,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:54,166 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:54,166 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1792776041] [2020-11-30 02:56:54,167 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [100207545] [2020-11-30 02:56:54,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:56:54,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:54,238 INFO L263 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 02:56:54,243 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:56:54,328 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:54,329 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:56:54,363 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:56:54,364 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2040186114] [2020-11-30 02:56:54,391 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:56:54,391 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:56:54,397 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:56:54,405 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:56:54,406 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:56:57,208 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:56:57,211 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:56:57,211 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-11-30 02:56:57,211 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [142324681] [2020-11-30 02:56:57,212 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 02:56:57,212 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:57,212 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 02:56:57,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-30 02:56:57,213 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand 7 states. [2020-11-30 02:56:57,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:57,248 INFO L93 Difference]: Finished difference Result 25 states and 34 transitions. [2020-11-30 02:56:57,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 02:56:57,249 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 11 [2020-11-30 02:56:57,249 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:56:57,250 INFO L225 Difference]: With dead ends: 25 [2020-11-30 02:56:57,250 INFO L226 Difference]: Without dead ends: 15 [2020-11-30 02:56:57,250 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=21, Unknown=0, NotChecked=0, Total=42 [2020-11-30 02:56:57,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-11-30 02:56:57,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-11-30 02:56:57,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-11-30 02:56:57,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2020-11-30 02:56:57,254 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2020-11-30 02:56:57,255 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:56:57,255 INFO L481 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2020-11-30 02:56:57,255 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 02:56:57,255 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2020-11-30 02:56:57,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-11-30 02:56:57,256 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:56:57,256 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-30 02:56:57,465 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:56:57,466 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:56:57,466 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:56:57,466 INFO L82 PathProgramCache]: Analyzing trace with hash -858206193, now seen corresponding path program 2 times [2020-11-30 02:56:57,467 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:56:57,467 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1215172146] [2020-11-30 02:56:57,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:56:57,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:56:57,550 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 02:56:57,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1215172146] [2020-11-30 02:56:57,551 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1969334779] [2020-11-30 02:56:57,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:56:57,607 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-30 02:56:57,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:56:57,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 02:56:57,612 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:56:57,634 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-11-30 02:56:57,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:56:57,662 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-11-30 02:56:57,663 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [451307830] [2020-11-30 02:56:57,666 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:56:57,666 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:56:57,666 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:56:57,666 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:56:57,667 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:56:59,767 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:56:59,770 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:56:59,771 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2020-11-30 02:56:59,771 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [122944873] [2020-11-30 02:56:59,771 INFO L461 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-11-30 02:56:59,772 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:56:59,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-11-30 02:56:59,773 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2020-11-30 02:56:59,773 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand 8 states. [2020-11-30 02:56:59,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:56:59,999 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2020-11-30 02:57:00,000 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-11-30 02:57:00,000 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 14 [2020-11-30 02:57:00,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:57:00,002 INFO L225 Difference]: With dead ends: 102 [2020-11-30 02:57:00,002 INFO L226 Difference]: Without dead ends: 89 [2020-11-30 02:57:00,003 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=90, Invalid=150, Unknown=0, NotChecked=0, Total=240 [2020-11-30 02:57:00,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-11-30 02:57:00,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 69. [2020-11-30 02:57:00,023 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-11-30 02:57:00,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2020-11-30 02:57:00,029 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 14 [2020-11-30 02:57:00,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:57:00,029 INFO L481 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2020-11-30 02:57:00,029 INFO L482 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-11-30 02:57:00,029 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2020-11-30 02:57:00,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-11-30 02:57:00,035 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:57:00,035 INFO L422 BasicCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2020-11-30 02:57:00,261 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable206 [2020-11-30 02:57:00,261 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:57:00,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:57:00,262 INFO L82 PathProgramCache]: Analyzing trace with hash 475786310, now seen corresponding path program 3 times [2020-11-30 02:57:00,262 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:57:00,262 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2059645644] [2020-11-30 02:57:00,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:57:00,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:57:00,319 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 343 proven. 1 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2020-11-30 02:57:00,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2059645644] [2020-11-30 02:57:00,320 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827907133] [2020-11-30 02:57:00,321 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:57:00,397 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:57:00,397 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:57:00,398 INFO L263 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 02:57:00,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:57:00,474 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2020-11-30 02:57:00,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:57:00,522 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2020-11-30 02:57:00,523 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337279705] [2020-11-30 02:57:00,526 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:57:00,526 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:57:00,527 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:57:00,527 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:57:00,527 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:57:02,185 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:57:02,186 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:57:02,186 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2020-11-30 02:57:02,186 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130574466] [2020-11-30 02:57:02,187 INFO L461 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-11-30 02:57:02,187 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:57:02,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-11-30 02:57:02,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2020-11-30 02:57:02,188 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand 10 states. [2020-11-30 02:57:02,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:57:02,426 INFO L93 Difference]: Finished difference Result 291 states and 399 transitions. [2020-11-30 02:57:02,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-11-30 02:57:02,427 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 68 [2020-11-30 02:57:02,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:57:02,429 INFO L225 Difference]: With dead ends: 291 [2020-11-30 02:57:02,430 INFO L226 Difference]: Without dead ends: 225 [2020-11-30 02:57:02,431 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 150 GetRequests, 129 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=168, Invalid=294, Unknown=0, NotChecked=0, Total=462 [2020-11-30 02:57:02,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2020-11-30 02:57:02,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 157. [2020-11-30 02:57:02,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 157 states. [2020-11-30 02:57:02,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 185 transitions. [2020-11-30 02:57:02,456 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 185 transitions. Word has length 68 [2020-11-30 02:57:02,457 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:57:02,457 INFO L481 AbstractCegarLoop]: Abstraction has 157 states and 185 transitions. [2020-11-30 02:57:02,457 INFO L482 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-11-30 02:57:02,457 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 185 transitions. [2020-11-30 02:57:02,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2020-11-30 02:57:02,460 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:57:02,460 INFO L422 BasicCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2020-11-30 02:57:02,673 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable409,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:57:02,674 INFO L429 AbstractCegarLoop]: === Iteration 8 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:57:02,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:57:02,674 INFO L82 PathProgramCache]: Analyzing trace with hash -160365274, now seen corresponding path program 4 times [2020-11-30 02:57:02,674 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:57:02,674 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [768585097] [2020-11-30 02:57:02,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:57:02,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:57:02,911 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-11-30 02:57:02,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [768585097] [2020-11-30 02:57:02,912 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [85836334] [2020-11-30 02:57:02,912 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:57:03,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:57:03,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 498 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 02:57:03,064 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:57:03,105 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-11-30 02:57:03,105 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:57:03,173 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2020-11-30 02:57:03,174 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1509440127] [2020-11-30 02:57:03,176 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:57:03,177 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:57:03,177 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:57:03,177 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:57:03,177 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:57:04,496 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:57:04,497 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:57:04,497 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-11-30 02:57:04,497 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807230918] [2020-11-30 02:57:04,498 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 02:57:04,499 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:57:04,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 02:57:04,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-30 02:57:04,499 INFO L87 Difference]: Start difference. First operand 157 states and 185 transitions. Second operand 9 states. [2020-11-30 02:57:04,573 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:57:04,573 INFO L93 Difference]: Finished difference Result 550 states and 667 transitions. [2020-11-30 02:57:04,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 02:57:04,574 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 156 [2020-11-30 02:57:04,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:57:04,577 INFO L225 Difference]: With dead ends: 550 [2020-11-30 02:57:04,577 INFO L226 Difference]: Without dead ends: 413 [2020-11-30 02:57:04,579 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 315 GetRequests, 308 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-30 02:57:04,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2020-11-30 02:57:04,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 413. [2020-11-30 02:57:04,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 413 states. [2020-11-30 02:57:04,649 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 473 transitions. [2020-11-30 02:57:04,650 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 473 transitions. Word has length 156 [2020-11-30 02:57:04,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:57:04,652 INFO L481 AbstractCegarLoop]: Abstraction has 413 states and 473 transitions. [2020-11-30 02:57:04,652 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 02:57:04,652 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 473 transitions. [2020-11-30 02:57:04,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2020-11-30 02:57:04,670 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:57:04,671 INFO L422 BasicCegarLoop]: trace histogram [288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1] [2020-11-30 02:57:04,885 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable611,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:57:04,885 INFO L429 AbstractCegarLoop]: === Iteration 9 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:57:04,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:57:04,886 INFO L82 PathProgramCache]: Analyzing trace with hash 2123536230, now seen corresponding path program 5 times [2020-11-30 02:57:04,886 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:57:04,886 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1308599094] [2020-11-30 02:57:04,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:57:05,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:57:05,432 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-11-30 02:57:05,432 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1308599094] [2020-11-30 02:57:05,432 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661147521] [2020-11-30 02:57:05,432 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:57:05,779 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 103 check-sat command(s) [2020-11-30 02:57:05,780 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:57:05,783 INFO L263 TraceCheckSpWp]: Trace formula consists of 654 conjuncts, 4 conjunts are in the unsatisfiable core [2020-11-30 02:57:05,811 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:57:06,004 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-11-30 02:57:06,004 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:57:06,238 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2020-11-30 02:57:06,238 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [108713122] [2020-11-30 02:57:06,244 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:57:06,244 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:57:06,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:57:06,244 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:57:06,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:57:07,377 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:57:07,377 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:57:07,377 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2020-11-30 02:57:07,378 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1984231878] [2020-11-30 02:57:07,379 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 02:57:07,379 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:57:07,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 02:57:07,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-30 02:57:07,380 INFO L87 Difference]: Start difference. First operand 413 states and 473 transitions. Second operand 9 states. [2020-11-30 02:57:07,538 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:57:07,538 INFO L93 Difference]: Finished difference Result 1523 states and 1756 transitions. [2020-11-30 02:57:07,539 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 02:57:07,539 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 412 [2020-11-30 02:57:07,539 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:57:07,545 INFO L225 Difference]: With dead ends: 1523 [2020-11-30 02:57:07,546 INFO L226 Difference]: Without dead ends: 1213 [2020-11-30 02:57:07,551 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 827 GetRequests, 820 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=36, Unknown=0, NotChecked=0, Total=72 [2020-11-30 02:57:07,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2020-11-30 02:57:07,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1213. [2020-11-30 02:57:07,660 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 1213 states. [2020-11-30 02:57:07,665 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 1385 transitions. [2020-11-30 02:57:07,665 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 1385 transitions. Word has length 412 [2020-11-30 02:57:07,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:57:07,667 INFO L481 AbstractCegarLoop]: Abstraction has 1213 states and 1385 transitions. [2020-11-30 02:57:07,668 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 02:57:07,668 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 1385 transitions. [2020-11-30 02:57:07,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2020-11-30 02:57:07,725 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:57:07,725 INFO L422 BasicCegarLoop]: trace histogram [864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1] [2020-11-30 02:57:07,941 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable814 [2020-11-30 02:57:07,941 INFO L429 AbstractCegarLoop]: === Iteration 10 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:57:07,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:57:07,942 INFO L82 PathProgramCache]: Analyzing trace with hash -1248574618, now seen corresponding path program 6 times [2020-11-30 02:57:07,942 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:57:07,942 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1252840843] [2020-11-30 02:57:07,942 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:57:09,784 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:57:12,262 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2020-11-30 02:57:12,262 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1252840843] [2020-11-30 02:57:12,263 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [389666739] [2020-11-30 02:57:12,263 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/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 02:57:13,092 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 02:57:13,093 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:57:13,106 INFO L263 TraceCheckSpWp]: Trace formula consists of 3629 conjuncts, 28 conjunts are in the unsatisfiable core [2020-11-30 02:57:13,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:57:15,296 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2020-11-30 02:57:15,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:57:19,097 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2020-11-30 02:57:19,097 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [656781066] [2020-11-30 02:57:19,100 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2020-11-30 02:57:19,100 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:57:19,101 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:57:19,101 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:57:19,101 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:57:20,283 FATAL L? ?]: Ignoring exception! java.util.ConcurrentModificationException at java.base/java.util.HashMap.computeIfAbsent(HashMap.java:1134) at de.uni_freiburg.informatik.ultimate.lib.sifa.summarizers.FixpointLoopSummarizer.summarize(FixpointLoopSummarizer.java:94) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretLoop(DagInterpreter.java:177) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:168) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:289) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:189) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:179) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:84) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:74) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:511) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterateInternal(AbstractCegarLoop.java:438) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:372) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopResult.iterate(CegarLoopResult.java:142) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.iterateNew(TraceAbstractionStarter.java:341) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:182) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:134) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:124) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2020-11-30 02:57:20,283 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:57:20,284 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 25, 25] total 52 [2020-11-30 02:57:20,284 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671179159] [2020-11-30 02:57:20,287 INFO L461 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-11-30 02:57:20,287 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:57:20,288 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-11-30 02:57:20,289 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=716, Invalid=1936, Unknown=0, NotChecked=0, Total=2652 [2020-11-30 02:57:20,290 INFO L87 Difference]: Start difference. First operand 1213 states and 1385 transitions. Second operand 52 states. [2020-11-30 02:58:02,900 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 13 [2020-11-30 02:58:10,486 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2020-11-30 02:58:55,394 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 13 [2020-11-30 02:59:50,842 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 17 DAG size of output: 12 [2020-11-30 03:03:10,975 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 03:03:10,975 INFO L93 Difference]: Finished difference Result 1818 states and 2078 transitions. [2020-11-30 03:03:10,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 1816 states. [2020-11-30 03:03:10,978 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 1212 [2020-11-30 03:03:10,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 03:03:10,981 INFO L225 Difference]: With dead ends: 1818 [2020-11-30 03:03:10,982 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 03:03:11,158 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4231 GetRequests, 2377 SyntacticMatches, 1 SemanticMatches, 1853 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628613 ImplicationChecksByTransitivity, 341.9s TimeCoverageRelationStatistics Valid=340178, Invalid=3098992, Unknown=0, NotChecked=0, Total=3439170 [2020-11-30 03:03:11,158 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 03:03:11,159 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 03:03:11,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 03:03:11,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 03:03:11,159 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 1212 [2020-11-30 03:03:11,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 03:03:11,159 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 03:03:11,159 INFO L482 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-11-30 03:03:11,159 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 03:03:11,160 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 03:03:11,360 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1016,7 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 03:03:11,362 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-30 03:03:12,115 WARN L193 SmtUtils]: Spent 747.00 ms on a formula simplification. DAG size of input: 327 DAG size of output: 222 [2020-11-30 03:03:26,942 WARN L193 SmtUtils]: Spent 14.82 s on a formula simplification. DAG size of input: 1782 DAG size of output: 1181 [2020-11-30 03:03:29,239 WARN L193 SmtUtils]: Spent 2.26 s on a formula simplification. DAG size of input: 218 DAG size of output: 11 [2020-11-30 03:04:09,329 WARN L193 SmtUtils]: Spent 40.08 s on a formula simplification. DAG size of input: 1149 DAG size of output: 10 [2020-11-30 03:04:09,439 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 14 [2020-11-30 03:04:09,745 WARN L193 SmtUtils]: Spent 304.00 ms on a formula simplification. DAG size of input: 61 DAG size of output: 12 [2020-11-30 03:04:09,749 INFO L277 CegarLoopResult]: At program point L31(lines 31 33) the Hoare annotation is: true [2020-11-30 03:04:09,749 INFO L270 CegarLoopResult]: At program point L23-3(lines 23 29) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~c~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6) (<= ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~c~0)) [2020-11-30 03:04:09,749 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-30 03:04:09,749 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-11-30 03:04:09,750 INFO L270 CegarLoopResult]: At program point L24-3(lines 24 28) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~c~0 6) (< ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6)) [2020-11-30 03:04:09,750 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-30 03:04:09,750 INFO L270 CegarLoopResult]: At program point L25-3(lines 25 27) the Hoare annotation is: (and (< ULTIMATE.start_main_~a~0 6) (< ULTIMATE.start_main_~b~0 6) (<= ULTIMATE.start_main_~d~0 6) (< ULTIMATE.start_main_~c~0 6)) [2020-11-30 03:04:09,750 INFO L274 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-11-30 03:04:09,750 INFO L270 CegarLoopResult]: At program point L22-3(lines 22 30) the Hoare annotation is: (and (<= ULTIMATE.start_main_~c~0 6) (<= 6 ULTIMATE.start_main_~d~0) (<= ULTIMATE.start_main_~d~0 6) (<= ULTIMATE.start_main_~b~0 6) (<= 6 ULTIMATE.start_main_~b~0) (<= 6 ULTIMATE.start_main_~c~0) (< ULTIMATE.start_main_~a~0 7)) [2020-11-30 03:04:09,750 INFO L274 CegarLoopResult]: For program point L22-4(lines 15 35) no Hoare annotation was computed. [2020-11-30 03:04:09,767 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 03:04:09 BoogieIcfgContainer [2020-11-30 03:04:09,767 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 03:04:09,768 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 03:04:09,768 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 03:04:09,768 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 03:04:09,769 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:56:53" (3/4) ... [2020-11-30 03:04:09,771 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 03:04:09,780 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 12 nodes and edges [2020-11-30 03:04:09,781 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2020-11-30 03:04:09,781 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-30 03:04:09,781 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 03:04:09,820 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_3732897f-d0eb-4d6d-af61-9b6d201454a8/bin/utaipan/witness.graphml [2020-11-30 03:04:09,820 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 03:04:09,822 INFO L168 Benchmark]: Toolchain (without parser) took 437420.54 ms. Allocated memory was 88.1 MB in the beginning and 2.8 GB in the end (delta: 2.7 GB). Free memory was 65.7 MB in the beginning and 2.0 GB in the end (delta: -1.9 GB). Peak memory consumption was 815.1 MB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,822 INFO L168 Benchmark]: CDTParser took 0.30 ms. Allocated memory is still 73.4 MB. Free memory was 52.3 MB in the beginning and 52.2 MB in the end (delta: 31.9 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 03:04:09,823 INFO L168 Benchmark]: CACSL2BoogieTranslator took 278.65 ms. Allocated memory is still 88.1 MB. Free memory was 65.5 MB in the beginning and 64.4 MB in the end (delta: 1.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,823 INFO L168 Benchmark]: Boogie Procedure Inliner took 40.95 ms. Allocated memory is still 88.1 MB. Free memory was 64.4 MB in the beginning and 62.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,824 INFO L168 Benchmark]: Boogie Preprocessor took 31.04 ms. Allocated memory is still 88.1 MB. Free memory was 62.9 MB in the beginning and 62.0 MB in the end (delta: 944.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 03:04:09,824 INFO L168 Benchmark]: RCFGBuilder took 487.57 ms. Allocated memory is still 88.1 MB. Free memory was 62.0 MB in the beginning and 46.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,825 INFO L168 Benchmark]: TraceAbstraction took 436520.27 ms. Allocated memory was 88.1 MB in the beginning and 2.8 GB in the end (delta: 2.7 GB). Free memory was 45.6 MB in the beginning and 2.0 GB in the end (delta: -2.0 GB). Peak memory consumption was 2.2 GB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,826 INFO L168 Benchmark]: Witness Printer took 52.88 ms. Allocated memory is still 2.8 GB. Free memory was 2.0 GB in the beginning and 2.0 GB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 03:04:09,829 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.30 ms. Allocated memory is still 73.4 MB. Free memory was 52.3 MB in the beginning and 52.2 MB in the end (delta: 31.9 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 278.65 ms. Allocated memory is still 88.1 MB. Free memory was 65.5 MB in the beginning and 64.4 MB in the end (delta: 1.1 MB). Peak memory consumption was 10.5 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 40.95 ms. Allocated memory is still 88.1 MB. Free memory was 64.4 MB in the beginning and 62.9 MB in the end (delta: 1.4 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 31.04 ms. Allocated memory is still 88.1 MB. Free memory was 62.9 MB in the beginning and 62.0 MB in the end (delta: 944.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * RCFGBuilder took 487.57 ms. Allocated memory is still 88.1 MB. Free memory was 62.0 MB in the beginning and 46.1 MB in the end (delta: 15.9 MB). Peak memory consumption was 16.8 MB. Max. memory is 16.1 GB. * TraceAbstraction took 436520.27 ms. Allocated memory was 88.1 MB in the beginning and 2.8 GB in the end (delta: 2.7 GB). Free memory was 45.6 MB in the beginning and 2.0 GB in the end (delta: -2.0 GB). Peak memory consumption was 2.2 GB. Max. memory is 16.1 GB. * Witness Printer took 52.88 ms. Allocated memory is still 2.8 GB. Free memory was 2.0 GB in the beginning and 2.0 GB 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: 13]: 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: 31]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: (((a < 6 && c <= 6) && b < 6) && 6 <= d) && d <= 6 - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: ((a < 6 && b < 6) && d <= 6) && c < 6 - InvariantResult [Line: 22]: Loop Invariant Derived loop invariant: (((((c <= 6 && 6 <= d) && d <= 6) && b <= 6) && 6 <= b) && 6 <= c) && a < 7 - InvariantResult [Line: 23]: Loop Invariant Derived loop invariant: ((((a < 6 && c <= 6) && 6 <= d) && d <= 6) && b <= 6) && 6 <= c - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 10 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 378.0s, OverallIterations: 10, TraceHistogramMax: 864, AutomataDifference: 351.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 58.3s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 83 SDtfs, 131 SDslu, 105 SDs, 0 SdLazy, 331 SolverSat, 8466 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 5.9s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 5596 GetRequests, 3684 SyntacticMatches, 2 SemanticMatches, 1910 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1628739 ImplicationChecksByTransitivity, 342.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=1213occurred 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: 0.2s AutomataMinimizationTime, 10 MinimizatonAttempts, 94 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 5 LocationsWithAnnotation, 5 PreInvPairs, 1819 NumberOfFragments, 71 HoareAnnotationTreeSize, 5 FomulaSimplifications, 57997 FormulaSimplificationTreeSizeReduction, 15.6s HoareSimplificationTime, 5 FomulaSimplificationsInter, 28236 FormulaSimplificationTreeSizeReductionInter, 42.7s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.4s SsaConstructionTime, 3.2s SatisfiabilityAnalysisTime, 7.9s InterpolantComputationTime, 3774 NumberOfCodeBlocks, 3560 NumberOfCodeBlocksAsserted, 119 NumberOfCheckSat, 5625 ConstructedInterpolants, 0 QuantifiedInterpolants, 17005054 SizeOfPredicates, 10 NumberOfNonLiveVariables, 5089 ConjunctsInSsa, 48 ConjunctsInUnsatCore, 22 InterpolantComputations, 4 PerfectInterpolantSequences, 1308404/1761933 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...