./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 7b2dab56 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 93ddc895418216afe230ea40e87acd63de5c2d0d ................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................. Execution finished normally Writing output log to file Ultimate.log Result: TRUE --- Real Ultimate output --- This is Ultimate 0.2.0-7b2dab5 [2020-12-09 10:54:55,037 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-12-09 10:54:55,038 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-12-09 10:54:55,061 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-12-09 10:54:55,061 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-12-09 10:54:55,062 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-12-09 10:54:55,064 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-12-09 10:54:55,075 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-12-09 10:54:55,077 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-12-09 10:54:55,078 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-12-09 10:54:55,079 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-12-09 10:54:55,080 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-12-09 10:54:55,080 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-12-09 10:54:55,081 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-12-09 10:54:55,082 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-12-09 10:54:55,083 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-12-09 10:54:55,084 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-12-09 10:54:55,084 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-12-09 10:54:55,086 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-12-09 10:54:55,088 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-12-09 10:54:55,089 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-12-09 10:54:55,091 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-12-09 10:54:55,092 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-12-09 10:54:55,092 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-12-09 10:54:55,095 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-12-09 10:54:55,095 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-12-09 10:54:55,096 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-12-09 10:54:55,096 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-12-09 10:54:55,097 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-12-09 10:54:55,098 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-12-09 10:54:55,098 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-12-09 10:54:55,099 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-12-09 10:54:55,100 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-12-09 10:54:55,100 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-12-09 10:54:55,101 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-12-09 10:54:55,101 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-12-09 10:54:55,102 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-12-09 10:54:55,102 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-12-09 10:54:55,103 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-12-09 10:54:55,103 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-12-09 10:54:55,104 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-12-09 10:54:55,104 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-12-09 10:54:55,120 INFO L113 SettingsManager]: Loading preferences was successful [2020-12-09 10:54:55,120 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-12-09 10:54:55,121 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-12-09 10:54:55,121 INFO L138 SettingsManager]: * User list type=DISABLED [2020-12-09 10:54:55,121 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-12-09 10:54:55,121 INFO L138 SettingsManager]: * Explicit value domain=true [2020-12-09 10:54:55,121 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-12-09 10:54:55,121 INFO L138 SettingsManager]: * Octagon Domain=false [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Interval Domain=false [2020-12-09 10:54:55,122 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-12-09 10:54:55,122 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-12-09 10:54:55,123 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * sizeof long=4 [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-12-09 10:54:55,123 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * sizeof long double=12 [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * Use constant arrays=true [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-12-09 10:54:55,124 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-12-09 10:54:55,124 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-12-09 10:54:55,124 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-12-09 10:54:55,125 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-12-09 10:54:55,125 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_3140e348-c01b-4047-9532-e5bf44b1db77/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93ddc895418216afe230ea40e87acd63de5c2d0d [2020-12-09 10:54:55,297 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-12-09 10:54:55,316 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-12-09 10:54:55,318 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-12-09 10:54:55,319 INFO L271 PluginConnector]: Initializing CDTParser... [2020-12-09 10:54:55,320 INFO L275 PluginConnector]: CDTParser initialized [2020-12-09 10:54:55,320 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_2.c [2020-12-09 10:54:55,361 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/data/a59544707/2095f60f98164286add788c947bd7fda/FLAG6e545d147 [2020-12-09 10:54:55,702 INFO L306 CDTParser]: Found 1 translation units. [2020-12-09 10:54:55,703 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/sv-benchmarks/c/loop-simple/nested_2.c [2020-12-09 10:54:55,707 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/data/a59544707/2095f60f98164286add788c947bd7fda/FLAG6e545d147 [2020-12-09 10:54:55,717 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/data/a59544707/2095f60f98164286add788c947bd7fda [2020-12-09 10:54:55,718 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-12-09 10:54:55,719 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-12-09 10:54:55,720 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-12-09 10:54:55,720 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-12-09 10:54:55,722 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-12-09 10:54:55,723 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,724 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@130cac76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55, skipping insertion in model container [2020-12-09 10:54:55,724 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,729 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-12-09 10:54:55,744 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-12-09 10:54:55,847 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/sv-benchmarks/c/loop-simple/nested_2.c[730,743] [2020-12-09 10:54:55,851 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:54:55,860 INFO L203 MainTranslator]: Completed pre-run [2020-12-09 10:54:55,872 WARN L226 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/sv-benchmarks/c/loop-simple/nested_2.c[730,743] [2020-12-09 10:54:55,872 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-12-09 10:54:55,882 INFO L208 MainTranslator]: Completed translation [2020-12-09 10:54:55,882 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55 WrapperNode [2020-12-09 10:54:55,883 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-12-09 10:54:55,884 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-12-09 10:54:55,884 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-12-09 10:54:55,884 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-12-09 10:54:55,890 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,896 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,912 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-12-09 10:54:55,912 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-12-09 10:54:55,913 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-12-09 10:54:55,913 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-12-09 10:54:55,920 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,921 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,922 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,922 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,925 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,929 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,930 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... [2020-12-09 10:54:55,931 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-12-09 10:54:55,932 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-12-09 10:54:55,933 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-12-09 10:54:55,933 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-12-09 10:54:55,934 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:54:56,003 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-12-09 10:54:56,003 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-12-09 10:54:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-12-09 10:54:56,004 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-12-09 10:54:56,192 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-12-09 10:54:56,192 INFO L299 CfgBuilder]: Removed 6 assume(true) statements. [2020-12-09 10:54:56,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:54:56 BoogieIcfgContainer [2020-12-09 10:54:56,194 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-12-09 10:54:56,196 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-12-09 10:54:56,196 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-12-09 10:54:56,199 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-12-09 10:54:56,199 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.12 10:54:55" (1/3) ... [2020-12-09 10:54:56,200 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47b16c4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:54:56, skipping insertion in model container [2020-12-09 10:54:56,200 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.12 10:54:55" (2/3) ... [2020-12-09 10:54:56,201 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@47b16c4a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.12 10:54:56, skipping insertion in model container [2020-12-09 10:54:56,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:54:56" (3/3) ... [2020-12-09 10:54:56,202 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_2.c [2020-12-09 10:54:56,213 INFO L180 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-12-09 10:54:56,215 INFO L192 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-12-09 10:54:56,224 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-12-09 10:54:56,242 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-12-09 10:54:56,242 INFO L378 AbstractCegarLoop]: Hoare is true [2020-12-09 10:54:56,242 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-12-09 10:54:56,242 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-12-09 10:54:56,243 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-12-09 10:54:56,243 INFO L382 AbstractCegarLoop]: Difference is false [2020-12-09 10:54:56,243 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-12-09 10:54:56,243 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-12-09 10:54:56,252 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2020-12-09 10:54:56,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-12-09 10:54:56,256 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:56,256 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-12-09 10:54:56,257 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:54:56,260 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:54:56,261 INFO L82 PathProgramCache]: Analyzing trace with hash 2158406, now seen corresponding path program 1 times [2020-12-09 10:54:56,268 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:54:56,268 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [313074143] [2020-12-09 10:54:56,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:54:56,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:56,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:54:56,402 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [313074143] [2020-12-09 10:54:56,402 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:54:56,402 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-12-09 10:54:56,403 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1595475629] [2020-12-09 10:54:56,406 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 10:54:56,406 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:54:56,415 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 10:54:56,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:54:56,417 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2020-12-09 10:54:56,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:54:56,440 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2020-12-09 10:54:56,440 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 10:54:56,441 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-12-09 10:54:56,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:54:56,447 INFO L225 Difference]: With dead ends: 15 [2020-12-09 10:54:56,447 INFO L226 Difference]: Without dead ends: 8 [2020-12-09 10:54:56,449 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 [2020-12-09 10:54:56,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-09 10:54:56,470 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2020-12-09 10:54:56,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-12-09 10:54:56,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2020-12-09 10:54:56,472 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2020-12-09 10:54:56,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:54:56,472 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2020-12-09 10:54:56,472 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 10:54:56,472 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2020-12-09 10:54:56,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-12-09 10:54:56,473 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:56,473 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-12-09 10:54:56,473 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-12-09 10:54:56,473 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:54:56,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:54:56,474 INFO L82 PathProgramCache]: Analyzing trace with hash 2043318562, now seen corresponding path program 1 times [2020-12-09 10:54:56,474 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:54:56,474 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1569324547] [2020-12-09 10:54:56,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:54:56,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:56,500 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:54:56,500 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1569324547] [2020-12-09 10:54:56,501 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-12-09 10:54:56,501 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-12-09 10:54:56,501 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1289057238] [2020-12-09 10:54:56,502 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-12-09 10:54:56,502 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:54:56,503 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-12-09 10:54:56,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:54:56,503 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 3 states. [2020-12-09 10:54:56,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:54:56,513 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2020-12-09 10:54:56,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-12-09 10:54:56,513 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-12-09 10:54:56,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:54:56,514 INFO L225 Difference]: With dead ends: 13 [2020-12-09 10:54:56,514 INFO L226 Difference]: Without dead ends: 8 [2020-12-09 10:54:56,515 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-12-09 10:54:56,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-12-09 10:54:56,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-12-09 10:54:56,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-12-09 10:54:56,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2020-12-09 10:54:56,516 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2020-12-09 10:54:56,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:54:56,517 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2020-12-09 10:54:56,517 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-12-09 10:54:56,517 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2020-12-09 10:54:56,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-12-09 10:54:56,517 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:56,517 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-12-09 10:54:56,517 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-12-09 10:54:56,517 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:54:56,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:54:56,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1085255066, now seen corresponding path program 1 times [2020-12-09 10:54:56,518 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:54:56,518 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1069726971] [2020-12-09 10:54:56,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:54:56,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:56,544 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:54:56,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1069726971] [2020-12-09 10:54:56,544 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2099768708] [2020-12-09 10:54:56,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:54:56,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:56,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 10:54:56,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:54:56,620 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:54:56,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:54:56,649 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-12-09 10:54:56,649 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1759131547] [2020-12-09 10:54:56,666 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 10:54:56,667 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:54:56,670 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 10:54:56,673 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 10:54:56,674 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 10:54:57,182 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 10:54:57,465 WARN L197 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 63 [2020-12-09 10:54:57,603 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:54:57,603 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 10:54:57,604 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-12-09 10:54:57,604 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1635108724] [2020-12-09 10:54:57,605 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 10:54:57,605 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:54:57,606 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 10:54:57,606 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-09 10:54:57,606 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 7 states. [2020-12-09 10:54:57,628 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:54:57,628 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2020-12-09 10:54:57,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 10:54:57,629 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-12-09 10:54:57,629 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:54:57,629 INFO L225 Difference]: With dead ends: 17 [2020-12-09 10:54:57,629 INFO L226 Difference]: Without dead ends: 11 [2020-12-09 10:54:57,630 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-09 10:54:57,630 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-12-09 10:54:57,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-12-09 10:54:57,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-12-09 10:54:57,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-12-09 10:54:57,632 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2020-12-09 10:54:57,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:54:57,632 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-12-09 10:54:57,632 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 10:54:57,632 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-12-09 10:54:57,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-12-09 10:54:57,633 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:57,633 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-12-09 10:54:57,833 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-12-09 10:54:57,834 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:54:57,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:54:57,834 INFO L82 PathProgramCache]: Analyzing trace with hash -1915567582, now seen corresponding path program 2 times [2020-12-09 10:54:57,834 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:54:57,834 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206108104] [2020-12-09 10:54:57,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:54:57,842 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:57,855 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 10:54:57,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206108104] [2020-12-09 10:54:57,856 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326371669] [2020-12-09 10:54:57,856 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:54:57,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-12-09 10:54:57,877 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 10:54:57,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 3 conjunts are in the unsatisfiable core [2020-12-09 10:54:57,878 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:54:57,892 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 10:54:57,892 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:54:57,907 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-12-09 10:54:57,908 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [642904163] [2020-12-09 10:54:57,909 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 10:54:57,909 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:54:57,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 10:54:57,910 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 10:54:57,910 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 10:54:58,224 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 10:54:58,341 WARN L197 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 89 DAG size of output: 32 [2020-12-09 10:54:58,516 WARN L197 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 63 [2020-12-09 10:54:58,661 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:54:58,662 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 10:54:58,662 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-12-09 10:54:58,662 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917591403] [2020-12-09 10:54:58,662 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-12-09 10:54:58,662 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:54:58,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-12-09 10:54:58,663 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-09 10:54:58,663 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2020-12-09 10:54:58,690 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:54:58,690 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-12-09 10:54:58,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-12-09 10:54:58,690 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2020-12-09 10:54:58,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:54:58,691 INFO L225 Difference]: With dead ends: 32 [2020-12-09 10:54:58,691 INFO L226 Difference]: Without dead ends: 29 [2020-12-09 10:54:58,692 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-12-09 10:54:58,692 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-12-09 10:54:58,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-12-09 10:54:58,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-12-09 10:54:58,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-12-09 10:54:58,695 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 10 [2020-12-09 10:54:58,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:54:58,696 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-12-09 10:54:58,696 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-12-09 10:54:58,696 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-12-09 10:54:58,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-12-09 10:54:58,697 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:58,697 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1, 1] [2020-12-09 10:54:58,897 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-12-09 10:54:58,898 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:54:58,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:54:58,900 INFO L82 PathProgramCache]: Analyzing trace with hash 191347894, now seen corresponding path program 3 times [2020-12-09 10:54:58,901 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:54:58,901 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [29932406] [2020-12-09 10:54:58,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:54:58,965 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:54:59,029 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-12-09 10:54:59,030 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [29932406] [2020-12-09 10:54:59,030 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1448428945] [2020-12-09 10:54:59,030 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:54:59,053 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-12-09 10:54:59,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 10:54:59,053 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 10:54:59,055 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:54:59,081 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-12-09 10:54:59,081 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:54:59,117 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-12-09 10:54:59,117 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434089955] [2020-12-09 10:54:59,118 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 10:54:59,119 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:54:59,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 10:54:59,119 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 10:54:59,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 10:54:59,375 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 10:54:59,639 WARN L197 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 63 [2020-12-09 10:54:59,768 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:54:59,768 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 10:54:59,769 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-12-09 10:54:59,769 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1384781655] [2020-12-09 10:54:59,769 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 10:54:59,770 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:54:59,770 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 10:54:59,770 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-12-09 10:54:59,770 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-12-09 10:54:59,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:54:59,788 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2020-12-09 10:54:59,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 10:54:59,788 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-12-09 10:54:59,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:54:59,789 INFO L225 Difference]: With dead ends: 59 [2020-12-09 10:54:59,789 INFO L226 Difference]: Without dead ends: 37 [2020-12-09 10:54:59,790 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-12-09 10:54:59,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-12-09 10:54:59,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-12-09 10:54:59,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-12-09 10:54:59,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-12-09 10:54:59,795 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-12-09 10:54:59,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:54:59,796 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-12-09 10:54:59,796 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 10:54:59,796 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-12-09 10:54:59,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-12-09 10:54:59,797 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:54:59,797 INFO L422 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2020-12-09 10:54:59,998 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:54:59,999 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:55:00,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:55:00,001 INFO L82 PathProgramCache]: Analyzing trace with hash 1881486518, now seen corresponding path program 4 times [2020-12-09 10:55:00,001 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:55:00,002 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [378257788] [2020-12-09 10:55:00,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:55:00,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:55:00,088 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-09 10:55:00,088 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [378257788] [2020-12-09 10:55:00,089 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1852108422] [2020-12-09 10:55:00,089 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:55:00,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:55:00,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-12-09 10:55:00,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:55:00,154 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-09 10:55:00,154 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:55:00,197 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-12-09 10:55:00,198 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [378860659] [2020-12-09 10:55:00,200 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 10:55:00,200 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:55:00,200 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 10:55:00,201 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 10:55:00,201 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 10:55:00,408 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 10:55:00,650 WARN L197 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 63 [2020-12-09 10:55:00,785 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:55:00,785 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 10:55:00,785 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2020-12-09 10:55:00,785 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1603700450] [2020-12-09 10:55:00,786 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-12-09 10:55:00,786 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:55:00,786 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-12-09 10:55:00,786 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-12-09 10:55:00,787 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 9 states. [2020-12-09 10:55:00,807 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:55:00,807 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2020-12-09 10:55:00,808 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-12-09 10:55:00,808 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-12-09 10:55:00,808 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:55:00,808 INFO L225 Difference]: With dead ends: 56 [2020-12-09 10:55:00,809 INFO L226 Difference]: Without dead ends: 53 [2020-12-09 10:55:00,809 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-12-09 10:55:00,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-12-09 10:55:00,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-12-09 10:55:00,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-12-09 10:55:00,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2020-12-09 10:55:00,814 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 36 [2020-12-09 10:55:00,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:55:00,815 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2020-12-09 10:55:00,815 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-12-09 10:55:00,815 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2020-12-09 10:55:00,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-12-09 10:55:00,816 INFO L414 BasicCegarLoop]: Found error trace [2020-12-09 10:55:00,816 INFO L422 BasicCegarLoop]: trace histogram [36, 6, 6, 1, 1, 1, 1] [2020-12-09 10:55:01,016 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-12-09 10:55:01,018 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-12-09 10:55:01,018 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-12-09 10:55:01,019 INFO L82 PathProgramCache]: Analyzing trace with hash 1245491054, now seen corresponding path program 5 times [2020-12-09 10:55:01,020 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-12-09 10:55:01,020 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1213950379] [2020-12-09 10:55:01,021 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-12-09 10:55:01,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-12-09 10:55:01,157 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 777 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-12-09 10:55:01,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1213950379] [2020-12-09 10:55:01,158 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941898196] [2020-12-09 10:55:01,158 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/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 [2020-12-09 10:55:01,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-12-09 10:55:01,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-12-09 10:55:01,189 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 18 conjunts are in the unsatisfiable core [2020-12-09 10:55:01,191 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-12-09 10:55:01,283 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 251 proven. 21 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2020-12-09 10:55:01,283 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-12-09 10:55:01,481 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 251 proven. 21 refuted. 0 times theorem prover too weak. 610 trivial. 0 not checked. [2020-12-09 10:55:01,481 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722723425] [2020-12-09 10:55:01,483 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-12-09 10:55:01,483 INFO L166 IcfgInterpreter]: Building call graph [2020-12-09 10:55:01,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-12-09 10:55:01,483 INFO L176 IcfgInterpreter]: Starting interpretation [2020-12-09 10:55:01,483 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-12-09 10:55:01,691 INFO L180 IcfgInterpreter]: Interpretation finished [2020-12-09 10:55:01,957 WARN L197 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 84 DAG size of output: 63 [2020-12-09 10:55:02,097 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-12-09 10:55:02,097 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-12-09 10:55:02,097 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 11, 11] total 31 [2020-12-09 10:55:02,097 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [52634650] [2020-12-09 10:55:02,098 INFO L461 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-12-09 10:55:02,098 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-12-09 10:55:02,098 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-12-09 10:55:02,099 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=968, Unknown=0, NotChecked=0, Total=1190 [2020-12-09 10:55:02,099 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand 31 states. [2020-12-09 10:55:02,617 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-12-09 10:55:02,617 INFO L93 Difference]: Finished difference Result 96 states and 109 transitions. [2020-12-09 10:55:02,618 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-12-09 10:55:02,618 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 52 [2020-12-09 10:55:02,618 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-12-09 10:55:02,618 INFO L225 Difference]: With dead ends: 96 [2020-12-09 10:55:02,618 INFO L226 Difference]: Without dead ends: 0 [2020-12-09 10:55:02,620 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 133 SyntacticMatches, 4 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1337 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=957, Invalid=3873, Unknown=0, NotChecked=0, Total=4830 [2020-12-09 10:55:02,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-12-09 10:55:02,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-12-09 10:55:02,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-12-09 10:55:02,621 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-12-09 10:55:02,621 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 52 [2020-12-09 10:55:02,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-12-09 10:55:02,621 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-12-09 10:55:02,621 INFO L482 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-12-09 10:55:02,621 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-12-09 10:55:02,621 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-12-09 10:55:02,822 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable190 [2020-12-09 10:55:02,827 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-12-09 10:55:03,017 WARN L197 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 73 DAG size of output: 25 [2020-12-09 10:55:03,019 INFO L262 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-12-09 10:55:03,020 INFO L265 CegarLoopResult]: At program point L25-1(lines 25 27) the Hoare annotation is: true [2020-12-09 10:55:03,020 INFO L258 CegarLoopResult]: At program point L21-3(lines 21 23) the Hoare annotation is: (let ((.cse0 (<= ULTIMATE.start_main_~a~0 5))) (or (and .cse0 (= ULTIMATE.start_main_~b~0 5)) (and (= ULTIMATE.start_main_~b~0 2) .cse0) (and (= ULTIMATE.start_main_~b~0 1) .cse0) (and (= ULTIMATE.start_main_~b~0 3) .cse0) (and .cse0 (= ULTIMATE.start_main_~b~0 0)) (and (= ULTIMATE.start_main_~b~0 4) .cse0) (and (= ULTIMATE.start_main_~b~0 6) .cse0))) [2020-12-09 10:55:03,020 INFO L262 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-12-09 10:55:03,020 INFO L262 CegarLoopResult]: For program point L26(line 26) no Hoare annotation was computed. [2020-12-09 10:55:03,020 INFO L262 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 26) no Hoare annotation was computed. [2020-12-09 10:55:03,020 INFO L258 CegarLoopResult]: At program point L20-3(lines 20 24) the Hoare annotation is: (and (<= ULTIMATE.start_main_~a~0 6) (<= ULTIMATE.start_main_~b~0 6) (< 5 ULTIMATE.start_main_~b~0)) [2020-12-09 10:55:03,020 INFO L262 CegarLoopResult]: For program point L20-4(lines 15 29) no Hoare annotation was computed. [2020-12-09 10:55:03,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 09.12 10:55:03 BoogieIcfgContainer [2020-12-09 10:55:03,030 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-12-09 10:55:03,031 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-12-09 10:55:03,031 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-12-09 10:55:03,031 INFO L275 PluginConnector]: Witness Printer initialized [2020-12-09 10:55:03,031 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.12 10:54:56" (3/4) ... [2020-12-09 10:55:03,033 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-12-09 10:55:03,038 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2020-12-09 10:55:03,038 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-12-09 10:55:03,038 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-12-09 10:55:03,039 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-12-09 10:55:03,058 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_3140e348-c01b-4047-9532-e5bf44b1db77/bin/utaipan/witness.graphml [2020-12-09 10:55:03,058 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-12-09 10:55:03,059 INFO L168 Benchmark]: Toolchain (without parser) took 7339.57 ms. Allocated memory was 71.3 MB in the beginning and 180.4 MB in the end (delta: 109.1 MB). Free memory was 30.4 MB in the beginning and 112.6 MB in the end (delta: -82.2 MB). Peak memory consumption was 30.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,059 INFO L168 Benchmark]: CDTParser took 0.11 ms. Allocated memory is still 71.3 MB. Free memory was 46.6 MB in the beginning and 46.4 MB in the end (delta: 115.4 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-12-09 10:55:03,060 INFO L168 Benchmark]: CACSL2BoogieTranslator took 162.55 ms. Allocated memory was 71.3 MB in the beginning and 102.8 MB in the end (delta: 31.5 MB). Free memory was 30.2 MB in the beginning and 76.5 MB in the end (delta: -46.3 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,060 INFO L168 Benchmark]: Boogie Procedure Inliner took 28.19 ms. Allocated memory is still 102.8 MB. Free memory was 76.5 MB in the beginning and 74.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,060 INFO L168 Benchmark]: Boogie Preprocessor took 19.17 ms. Allocated memory is still 102.8 MB. Free memory was 74.9 MB in the beginning and 73.9 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,061 INFO L168 Benchmark]: RCFGBuilder took 261.97 ms. Allocated memory is still 102.8 MB. Free memory was 73.9 MB in the beginning and 73.6 MB in the end (delta: 253.3 kB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,061 INFO L168 Benchmark]: TraceAbstraction took 6834.99 ms. Allocated memory was 102.8 MB in the beginning and 180.4 MB in the end (delta: 77.6 MB). Free memory was 72.7 MB in the beginning and 114.7 MB in the end (delta: -41.9 MB). Peak memory consumption was 101.2 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,061 INFO L168 Benchmark]: Witness Printer took 27.67 ms. Allocated memory is still 180.4 MB. Free memory was 114.7 MB in the beginning and 112.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. [2020-12-09 10:55:03,063 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.11 ms. Allocated memory is still 71.3 MB. Free memory was 46.6 MB in the beginning and 46.4 MB in the end (delta: 115.4 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 162.55 ms. Allocated memory was 71.3 MB in the beginning and 102.8 MB in the end (delta: 31.5 MB). Free memory was 30.2 MB in the beginning and 76.5 MB in the end (delta: -46.3 MB). Peak memory consumption was 7.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 28.19 ms. Allocated memory is still 102.8 MB. Free memory was 76.5 MB in the beginning and 74.9 MB in the end (delta: 1.6 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Boogie Preprocessor took 19.17 ms. Allocated memory is still 102.8 MB. Free memory was 74.9 MB in the beginning and 73.9 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 261.97 ms. Allocated memory is still 102.8 MB. Free memory was 73.9 MB in the beginning and 73.6 MB in the end (delta: 253.3 kB). Peak memory consumption was 6.3 MB. Max. memory is 16.1 GB. * TraceAbstraction took 6834.99 ms. Allocated memory was 102.8 MB in the beginning and 180.4 MB in the end (delta: 77.6 MB). Free memory was 72.7 MB in the beginning and 114.7 MB in the end (delta: -41.9 MB). Peak memory consumption was 101.2 MB. Max. memory is 16.1 GB. * Witness Printer took 27.67 ms. Allocated memory is still 180.4 MB. Free memory was 114.7 MB in the beginning and 112.6 MB in the end (delta: 2.1 MB). Peak memory consumption was 4.2 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 26]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: (a <= 6 && b <= 6) && 5 < b - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: ((((((a <= 5 && b == 5) || (b == 2 && a <= 5)) || (b == 1 && a <= 5)) || (b == 3 && a <= 5)) || (a <= 5 && b == 0)) || (b == 4 && a <= 5)) || (b == 6 && a <= 5) - InvariantResult [Line: 25]: Loop Invariant Derived loop invariant: 1 - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 8 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 6.5s, OverallIterations: 7, TraceHistogramMax: 36, AutomataDifference: 0.6s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 28 SDslu, 34 SDs, 0 SdLazy, 266 SolverSat, 145 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 467 GetRequests, 351 SyntacticMatches, 6 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1479 ImplicationChecksByTransitivity, 2.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=53occurred in iteration=6, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 7 MinimizatonAttempts, 1 StatesRemovedByMinimization, 1 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 3 LocationsWithAnnotation, 3 PreInvPairs, 53 NumberOfFragments, 61 HoareAnnotationTreeSize, 3 FomulaSimplifications, 0 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 507 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.8s InterpolantComputationTime, 276 NumberOfCodeBlocks, 239 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 392 ConstructedInterpolants, 0 QuantifiedInterpolants, 40310 SizeOfPredicates, 3 NumberOfNonLiveVariables, 388 ConjunctsInSsa, 36 ConjunctsInUnsatCore, 17 InterpolantComputations, 2 PerfectInterpolantSequences, 2683/4450 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...