./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 a4ecdabc Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_2.c -s /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/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-a4ecdab [2020-11-30 01:51:09,968 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 01:51:09,971 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 01:51:10,028 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 01:51:10,028 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 01:51:10,034 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 01:51:10,037 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 01:51:10,044 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 01:51:10,046 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 01:51:10,047 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 01:51:10,048 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 01:51:10,050 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 01:51:10,050 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 01:51:10,052 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 01:51:10,053 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 01:51:10,054 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 01:51:10,055 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 01:51:10,056 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 01:51:10,059 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 01:51:10,061 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 01:51:10,063 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 01:51:10,071 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 01:51:10,073 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 01:51:10,073 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 01:51:10,077 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 01:51:10,077 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 01:51:10,078 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 01:51:10,079 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 01:51:10,079 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 01:51:10,080 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 01:51:10,081 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 01:51:10,082 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 01:51:10,083 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 01:51:10,084 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 01:51:10,085 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 01:51:10,093 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 01:51:10,095 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 01:51:10,095 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 01:51:10,096 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 01:51:10,097 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 01:51:10,098 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 01:51:10,103 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 01:51:10,141 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 01:51:10,145 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 01:51:10,146 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 01:51:10,146 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 01:51:10,147 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 01:51:10,147 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 01:51:10,147 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 01:51:10,147 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 01:51:10,147 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 01:51:10,148 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 01:51:10,149 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 01:51:10,149 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 01:51:10,149 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 01:51:10,149 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 01:51:10,149 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 01:51:10,150 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 01:51:10,151 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 01:51:10,151 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 01:51:10,151 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 01:51:10,151 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 01:51:10,151 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 01:51:10,152 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 01:51:10,153 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 01:51:10,153 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 01:51:10,153 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 01:51:10,153 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 01:51:10,153 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:51:10,154 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 01:51:10,154 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 01:51:10,154 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 01:51:10,154 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 01:51:10,154 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 01:51:10,156 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 01:51:10,156 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 01:51:10,156 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 01:51:10,156 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_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 93ddc895418216afe230ea40e87acd63de5c2d0d [2020-11-30 01:51:10,416 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 01:51:10,446 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 01:51:10,450 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 01:51:10,452 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 01:51:10,453 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 01:51:10,462 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_2.c [2020-11-30 01:51:10,548 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/data/3723d3013/e5f2e4276a5a476d85dc1303e8a26dd6/FLAG9e78677df [2020-11-30 01:51:11,103 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 01:51:11,105 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/sv-benchmarks/c/loop-simple/nested_2.c [2020-11-30 01:51:11,117 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/data/3723d3013/e5f2e4276a5a476d85dc1303e8a26dd6/FLAG9e78677df [2020-11-30 01:51:11,457 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/data/3723d3013/e5f2e4276a5a476d85dc1303e8a26dd6 [2020-11-30 01:51:11,460 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 01:51:11,463 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 01:51:11,465 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 01:51:11,466 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 01:51:11,469 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 01:51:11,471 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,473 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7e8c4f25 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11, skipping insertion in model container [2020-11-30 01:51:11,473 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,481 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 01:51:11,498 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 01:51:11,741 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:51:11,749 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 01:51:11,763 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 01:51:11,776 INFO L208 MainTranslator]: Completed translation [2020-11-30 01:51:11,777 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11 WrapperNode [2020-11-30 01:51:11,777 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 01:51:11,779 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 01:51:11,779 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 01:51:11,779 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 01:51:11,787 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,793 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,809 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 01:51:11,810 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 01:51:11,810 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 01:51:11,811 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 01:51:11,819 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,819 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,820 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,820 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,823 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,827 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,828 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... [2020-11-30 01:51:11,830 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 01:51:11,831 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 01:51:11,831 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 01:51:11,831 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 01:51:11,833 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 01:51:11,898 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 01:51:11,899 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 01:51:11,899 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 01:51:11,899 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 01:51:12,173 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 01:51:12,174 INFO L298 CfgBuilder]: Removed 8 assume(true) statements. [2020-11-30 01:51:12,176 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:12 BoogieIcfgContainer [2020-11-30 01:51:12,176 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 01:51:12,178 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 01:51:12,178 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 01:51:12,182 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 01:51:12,182 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 01:51:11" (1/3) ... [2020-11-30 01:51:12,183 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d60a96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:51:12, skipping insertion in model container [2020-11-30 01:51:12,183 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 01:51:11" (2/3) ... [2020-11-30 01:51:12,184 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7d60a96 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 01:51:12, skipping insertion in model container [2020-11-30 01:51:12,184 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:12" (3/3) ... [2020-11-30 01:51:12,185 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_2.c [2020-11-30 01:51:12,196 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 01:51:12,200 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 01:51:12,213 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 01:51:12,237 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 01:51:12,237 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 01:51:12,237 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 01:51:12,238 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 01:51:12,238 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 01:51:12,238 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 01:51:12,238 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 01:51:12,238 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 01:51:12,266 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states. [2020-11-30 01:51:12,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 01:51:12,270 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:12,271 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 01:51:12,271 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:12,293 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:12,293 INFO L82 PathProgramCache]: Analyzing trace with hash 2189158, now seen corresponding path program 1 times [2020-11-30 01:51:12,303 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:12,303 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [613267623] [2020-11-30 01:51:12,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:12,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:12,481 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:12,482 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [613267623] [2020-11-30 01:51:12,483 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:51:12,483 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 01:51:12,484 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600376500] [2020-11-30 01:51:12,488 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 01:51:12,489 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:12,502 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 01:51:12,503 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:51:12,505 INFO L87 Difference]: Start difference. First operand 8 states. Second operand 3 states. [2020-11-30 01:51:12,546 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:12,547 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2020-11-30 01:51:12,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 01:51:12,548 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-30 01:51:12,548 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:12,556 INFO L225 Difference]: With dead ends: 15 [2020-11-30 01:51:12,556 INFO L226 Difference]: Without dead ends: 8 [2020-11-30 01:51:12,558 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:51:12,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-11-30 01:51:12,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 7. [2020-11-30 01:51:12,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 7 states. [2020-11-30 01:51:12,586 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7 states to 7 states and 8 transitions. [2020-11-30 01:51:12,588 INFO L78 Accepts]: Start accepts. Automaton has 7 states and 8 transitions. Word has length 4 [2020-11-30 01:51:12,588 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:12,588 INFO L481 AbstractCegarLoop]: Abstraction has 7 states and 8 transitions. [2020-11-30 01:51:12,588 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 01:51:12,588 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states and 8 transitions. [2020-11-30 01:51:12,589 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2020-11-30 01:51:12,589 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:12,589 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2020-11-30 01:51:12,589 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 01:51:12,590 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:12,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:12,591 INFO L82 PathProgramCache]: Analyzing trace with hash 2071978465, now seen corresponding path program 1 times [2020-11-30 01:51:12,591 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:12,592 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902686995] [2020-11-30 01:51:12,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:12,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:12,630 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 01:51:12,630 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902686995] [2020-11-30 01:51:12,630 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 01:51:12,630 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-11-30 01:51:12,630 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651197021] [2020-11-30 01:51:12,632 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 01:51:12,632 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:12,633 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 01:51:12,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 01:51:12,633 INFO L87 Difference]: Start difference. First operand 7 states and 8 transitions. Second operand 3 states. [2020-11-30 01:51:12,663 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:12,663 INFO L93 Difference]: Finished difference Result 13 states and 16 transitions. [2020-11-30 01:51:12,664 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 01:51:12,664 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 6 [2020-11-30 01:51:12,664 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:12,665 INFO L225 Difference]: With dead ends: 13 [2020-11-30 01:51:12,665 INFO L226 Difference]: Without dead ends: 8 [2020-11-30 01:51:12,666 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 01:51:12,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2020-11-30 01:51:12,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2020-11-30 01:51:12,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 8 states. [2020-11-30 01:51:12,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2020-11-30 01:51:12,668 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2020-11-30 01:51:12,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:12,669 INFO L481 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2020-11-30 01:51:12,669 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 01:51:12,669 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2020-11-30 01:51:12,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2020-11-30 01:51:12,669 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:12,670 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2020-11-30 01:51:12,670 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-30 01:51:12,670 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:12,671 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:12,672 INFO L82 PathProgramCache]: Analyzing trace with hash -196797112, now seen corresponding path program 1 times [2020-11-30 01:51:12,672 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:12,672 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [778267145] [2020-11-30 01:51:12,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:12,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:12,736 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:12,736 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [778267145] [2020-11-30 01:51:12,737 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003552703] [2020-11-30 01:51:12,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:12,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:12,808 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 01:51:12,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:12,870 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:12,871 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:12,910 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 01:51:12,911 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [241540475] [2020-11-30 01:51:12,932 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-30 01:51:12,933 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:12,937 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:12,943 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:12,944 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:13,880 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:14,059 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-30 01:51:14,455 WARN L193 SmtUtils]: Spent 358.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-30 01:51:14,709 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-30 01:51:14,711 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:14,711 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:14,711 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2020-11-30 01:51:14,712 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793681782] [2020-11-30 01:51:14,712 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 01:51:14,712 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:14,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 01:51:14,713 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:51:14,713 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand 7 states. [2020-11-30 01:51:14,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:14,747 INFO L93 Difference]: Finished difference Result 17 states and 22 transitions. [2020-11-30 01:51:14,748 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:51:14,749 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 7 [2020-11-30 01:51:14,749 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:14,749 INFO L225 Difference]: With dead ends: 17 [2020-11-30 01:51:14,749 INFO L226 Difference]: Without dead ends: 11 [2020-11-30 01:51:14,750 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:51:14,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-30 01:51:14,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-30 01:51:14,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 01:51:14,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2020-11-30 01:51:14,753 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 7 [2020-11-30 01:51:14,753 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:14,753 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2020-11-30 01:51:14,753 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 01:51:14,753 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2020-11-30 01:51:14,753 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 01:51:14,754 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:14,754 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1] [2020-11-30 01:51:14,966 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2020-11-30 01:51:14,966 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:14,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:14,967 INFO L82 PathProgramCache]: Analyzing trace with hash 547816353, now seen corresponding path program 2 times [2020-11-30 01:51:14,967 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:14,967 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [997331879] [2020-11-30 01:51:14,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:14,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:15,009 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:51:15,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [997331879] [2020-11-30 01:51:15,009 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1590537319] [2020-11-30 01:51:15,009 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:15,049 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2020-11-30 01:51:15,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:51:15,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 01:51:15,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:15,071 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:51:15,071 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:15,090 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2020-11-30 01:51:15,090 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [338672094] [2020-11-30 01:51:15,093 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-30 01:51:15,093 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:15,093 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:15,094 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:15,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:15,640 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:15,805 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-30 01:51:16,148 WARN L193 SmtUtils]: Spent 321.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-30 01:51:16,387 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-30 01:51:16,388 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:16,388 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:16,389 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-30 01:51:16,389 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918878845] [2020-11-30 01:51:16,389 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 01:51:16,390 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:16,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 01:51:16,390 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:51:16,391 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand 7 states. [2020-11-30 01:51:16,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:16,426 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2020-11-30 01:51:16,427 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:51:16,427 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 10 [2020-11-30 01:51:16,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:16,428 INFO L225 Difference]: With dead ends: 32 [2020-11-30 01:51:16,428 INFO L226 Difference]: Without dead ends: 29 [2020-11-30 01:51:16,429 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2020-11-30 01:51:16,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-11-30 01:51:16,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-11-30 01:51:16,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-11-30 01:51:16,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-11-30 01:51:16,438 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 10 [2020-11-30 01:51:16,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:16,438 INFO L481 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-11-30 01:51:16,439 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 01:51:16,439 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-11-30 01:51:16,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-11-30 01:51:16,440 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:16,440 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 1, 1, 1, 1] [2020-11-30 01:51:16,640 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2020-11-30 01:51:16,640 INFO L429 AbstractCegarLoop]: === Iteration 5 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:16,641 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:16,641 INFO L82 PathProgramCache]: Analyzing trace with hash -85948718, now seen corresponding path program 3 times [2020-11-30 01:51:16,641 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:16,642 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1144310484] [2020-11-30 01:51:16,642 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:16,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:16,728 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-30 01:51:16,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1144310484] [2020-11-30 01:51:16,729 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [205342871] [2020-11-30 01:51:16,729 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/z3 Starting monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:16,781 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2020-11-30 01:51:16,781 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:51:16,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 01:51:16,785 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:16,813 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-30 01:51:16,813 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:16,854 INFO L134 CoverageAnalysis]: Checked inductivity of 200 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 111 trivial. 0 not checked. [2020-11-30 01:51:16,854 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [450629703] [2020-11-30 01:51:16,857 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-30 01:51:16,857 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:16,857 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:16,857 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:16,858 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:17,385 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:17,584 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-30 01:51:17,956 WARN L193 SmtUtils]: Spent 344.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-30 01:51:18,262 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-30 01:51:18,263 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:18,263 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:18,263 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 9 [2020-11-30 01:51:18,264 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413903924] [2020-11-30 01:51:18,264 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 01:51:18,264 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:18,265 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 01:51:18,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:51:18,265 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 9 states. [2020-11-30 01:51:18,303 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:18,303 INFO L93 Difference]: Finished difference Result 59 states and 74 transitions. [2020-11-30 01:51:18,304 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 01:51:18,304 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 28 [2020-11-30 01:51:18,304 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:18,305 INFO L225 Difference]: With dead ends: 59 [2020-11-30 01:51:18,305 INFO L226 Difference]: Without dead ends: 37 [2020-11-30 01:51:18,306 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 77 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:51:18,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-11-30 01:51:18,315 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-11-30 01:51:18,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-11-30 01:51:18,317 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-11-30 01:51:18,318 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-11-30 01:51:18,318 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:18,319 INFO L481 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-11-30 01:51:18,319 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 01:51:18,319 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-11-30 01:51:18,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-11-30 01:51:18,323 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:18,323 INFO L422 BasicCegarLoop]: trace histogram [24, 4, 4, 1, 1, 1, 1] [2020-11-30 01:51:18,523 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable96,4 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:18,524 INFO L429 AbstractCegarLoop]: === Iteration 6 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:18,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:18,524 INFO L82 PathProgramCache]: Analyzing trace with hash -300676654, now seen corresponding path program 4 times [2020-11-30 01:51:18,524 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:18,525 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342571068] [2020-11-30 01:51:18,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:18,548 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:18,611 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-30 01:51:18,612 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342571068] [2020-11-30 01:51:18,612 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272453689] [2020-11-30 01:51:18,612 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/z3 Starting monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:18,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:18,666 INFO L263 TraceCheckSpWp]: Trace formula consists of 134 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 01:51:18,668 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:18,689 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-30 01:51:18,689 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:18,718 INFO L134 CoverageAnalysis]: Checked inductivity of 388 backedges. 0 proven. 304 refuted. 0 times theorem prover too weak. 84 trivial. 0 not checked. [2020-11-30 01:51:18,718 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1050809754] [2020-11-30 01:51:18,721 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2020-11-30 01:51:18,721 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 01:51:18,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 01:51:18,721 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 01:51:18,722 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 01:51:19,143 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 01:51:19,317 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 90 DAG size of output: 36 [2020-11-30 01:51:19,739 WARN L193 SmtUtils]: Spent 395.00 ms on a formula simplification. DAG size of input: 85 DAG size of output: 70 [2020-11-30 01:51:20,011 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 86 DAG size of output: 31 [2020-11-30 01:51:20,012 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 01:51:20,012 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 01:51:20,012 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2020-11-30 01:51:20,013 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1648183282] [2020-11-30 01:51:20,013 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 01:51:20,013 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:20,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 01:51:20,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:51:20,014 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 9 states. [2020-11-30 01:51:20,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:20,071 INFO L93 Difference]: Finished difference Result 56 states and 63 transitions. [2020-11-30 01:51:20,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 01:51:20,072 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 36 [2020-11-30 01:51:20,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:20,073 INFO L225 Difference]: With dead ends: 56 [2020-11-30 01:51:20,073 INFO L226 Difference]: Without dead ends: 53 [2020-11-30 01:51:20,074 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 100 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=50, Invalid=106, Unknown=0, NotChecked=0, Total=156 [2020-11-30 01:51:20,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-11-30 01:51:20,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2020-11-30 01:51:20,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-11-30 01:51:20,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 59 transitions. [2020-11-30 01:51:20,085 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 59 transitions. Word has length 36 [2020-11-30 01:51:20,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:20,085 INFO L481 AbstractCegarLoop]: Abstraction has 53 states and 59 transitions. [2020-11-30 01:51:20,086 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 01:51:20,087 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 59 transitions. [2020-11-30 01:51:20,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-11-30 01:51:20,091 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 01:51:20,091 INFO L422 BasicCegarLoop]: trace histogram [36, 6, 6, 1, 1, 1, 1] [2020-11-30 01:51:20,305 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable143,5 z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 01:51:20,306 INFO L429 AbstractCegarLoop]: === Iteration 7 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 01:51:20,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 01:51:20,306 INFO L82 PathProgramCache]: Analyzing trace with hash -694183672, now seen corresponding path program 5 times [2020-11-30 01:51:20,306 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 01:51:20,306 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [174632445] [2020-11-30 01:51:20,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 01:51:20,337 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 01:51:20,616 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 0 proven. 777 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2020-11-30 01:51:20,617 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [174632445] [2020-11-30 01:51:20,618 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [760423116] [2020-11-30 01:51:20,618 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/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 01:51:20,693 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2020-11-30 01:51:20,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 01:51:20,694 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 7 conjunts are in the unsatisfiable core [2020-11-30 01:51:20,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 01:51:20,766 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 257 proven. 0 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2020-11-30 01:51:20,766 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 01:51:20,886 INFO L134 CoverageAnalysis]: Checked inductivity of 882 backedges. 251 proven. 6 refuted. 0 times theorem prover too weak. 625 trivial. 0 not checked. [2020-11-30 01:51:20,886 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 2 imperfect interpolant sequences. [2020-11-30 01:51:20,887 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [16, 6] total 19 [2020-11-30 01:51:20,887 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908564180] [2020-11-30 01:51:20,887 INFO L461 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-11-30 01:51:20,887 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 01:51:20,888 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-11-30 01:51:20,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=236, Unknown=0, NotChecked=0, Total=342 [2020-11-30 01:51:20,888 INFO L87 Difference]: Start difference. First operand 53 states and 59 transitions. Second operand 6 states. [2020-11-30 01:51:20,943 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 01:51:20,943 INFO L93 Difference]: Finished difference Result 53 states and 59 transitions. [2020-11-30 01:51:20,944 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 01:51:20,945 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 52 [2020-11-30 01:51:20,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 01:51:20,945 INFO L225 Difference]: With dead ends: 53 [2020-11-30 01:51:20,945 INFO L226 Difference]: Without dead ends: 0 [2020-11-30 01:51:20,946 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 119 GetRequests, 96 SyntacticMatches, 5 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 163 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=113, Invalid=267, Unknown=0, NotChecked=0, Total=380 [2020-11-30 01:51:20,946 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-11-30 01:51:20,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-11-30 01:51:20,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-11-30 01:51:20,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-11-30 01:51:20,947 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 52 [2020-11-30 01:51:20,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 01:51:20,947 INFO L481 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-11-30 01:51:20,947 INFO L482 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-11-30 01:51:20,947 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-11-30 01:51:20,947 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-11-30 01:51:21,148 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable189 [2020-11-30 01:51:21,149 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-11-30 01:51:21,209 INFO L274 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-11-30 01:51:21,209 INFO L277 CegarLoopResult]: At program point L25(lines 25 27) the Hoare annotation is: true [2020-11-30 01:51:21,210 INFO L270 CegarLoopResult]: At program point L21-3(lines 21 23) the Hoare annotation is: (and (<= ULTIMATE.start_main_~b~0 6) (<= ULTIMATE.start_main_~a~0 5)) [2020-11-30 01:51:21,210 INFO L274 CegarLoopResult]: For program point L13(line 13) no Hoare annotation was computed. [2020-11-30 01:51:21,210 INFO L274 CegarLoopResult]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2020-11-30 01:51:21,210 INFO L274 CegarLoopResult]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 13) no Hoare annotation was computed. [2020-11-30 01:51:21,210 INFO L270 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)) [2020-11-30 01:51:21,210 INFO L274 CegarLoopResult]: For program point L20-4(lines 15 29) no Hoare annotation was computed. [2020-11-30 01:51:21,225 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 01:51:21 BoogieIcfgContainer [2020-11-30 01:51:21,225 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 01:51:21,226 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 01:51:21,226 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 01:51:21,226 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 01:51:21,227 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 01:51:12" (3/4) ... [2020-11-30 01:51:21,230 INFO L137 WitnessPrinter]: Generating witness for correct program [2020-11-30 01:51:21,238 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 10 nodes and edges [2020-11-30 01:51:21,239 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 6 nodes and edges [2020-11-30 01:51:21,239 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 2 nodes and edges [2020-11-30 01:51:21,239 INFO L902 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2020-11-30 01:51:21,288 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_99d43240-5c37-4ef2-a8db-6a5b24fac8f7/bin/utaipan/witness.graphml [2020-11-30 01:51:21,288 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 01:51:21,291 INFO L168 Benchmark]: Toolchain (without parser) took 9825.78 ms. Allocated memory was 104.9 MB in the beginning and 224.4 MB in the end (delta: 119.5 MB). Free memory was 71.9 MB in the beginning and 115.8 MB in the end (delta: -43.9 MB). Peak memory consumption was 76.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,293 INFO L168 Benchmark]: CDTParser took 0.31 ms. Allocated memory is still 104.9 MB. Free memory was 79.9 MB in the beginning and 79.8 MB in the end (delta: 30.0 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:51:21,293 INFO L168 Benchmark]: CACSL2BoogieTranslator took 312.71 ms. Allocated memory is still 104.9 MB. Free memory was 71.7 MB in the beginning and 82.1 MB in the end (delta: -10.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,294 INFO L168 Benchmark]: Boogie Procedure Inliner took 30.84 ms. Allocated memory is still 104.9 MB. Free memory was 82.1 MB in the beginning and 80.6 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 01:51:21,294 INFO L168 Benchmark]: Boogie Preprocessor took 20.20 ms. Allocated memory is still 104.9 MB. Free memory was 80.6 MB in the beginning and 79.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,295 INFO L168 Benchmark]: RCFGBuilder took 345.18 ms. Allocated memory is still 104.9 MB. Free memory was 79.5 MB in the beginning and 65.9 MB in the end (delta: 13.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,298 INFO L168 Benchmark]: TraceAbstraction took 9048.03 ms. Allocated memory was 104.9 MB in the beginning and 224.4 MB in the end (delta: 119.5 MB). Free memory was 65.3 MB in the beginning and 118.0 MB in the end (delta: -52.6 MB). Peak memory consumption was 68.5 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,299 INFO L168 Benchmark]: Witness Printer took 62.14 ms. Allocated memory is still 224.4 MB. Free memory was 118.0 MB in the beginning and 115.8 MB in the end (delta: 2.2 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 01:51:21,301 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.31 ms. Allocated memory is still 104.9 MB. Free memory was 79.9 MB in the beginning and 79.8 MB in the end (delta: 30.0 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 312.71 ms. Allocated memory is still 104.9 MB. Free memory was 71.7 MB in the beginning and 82.1 MB in the end (delta: -10.4 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 30.84 ms. Allocated memory is still 104.9 MB. Free memory was 82.1 MB in the beginning and 80.6 MB in the end (delta: 1.6 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 20.20 ms. Allocated memory is still 104.9 MB. Free memory was 80.6 MB in the beginning and 79.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 345.18 ms. Allocated memory is still 104.9 MB. Free memory was 79.5 MB in the beginning and 65.9 MB in the end (delta: 13.6 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 9048.03 ms. Allocated memory was 104.9 MB in the beginning and 224.4 MB in the end (delta: 119.5 MB). Free memory was 65.3 MB in the beginning and 118.0 MB in the end (delta: -52.6 MB). Peak memory consumption was 68.5 MB. Max. memory is 16.1 GB. * Witness Printer took 62.14 ms. Allocated memory is still 224.4 MB. Free memory was 118.0 MB in the beginning and 115.8 MB in the end (delta: 2.2 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: 20]: Loop Invariant Derived loop invariant: (a <= 6 && b <= 6) && 5 < b - InvariantResult [Line: 21]: Loop Invariant Derived loop invariant: 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: 8.9s, OverallIterations: 7, TraceHistogramMax: 36, AutomataDifference: 0.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 36 SDtfs, 27 SDslu, 34 SDs, 0 SdLazy, 93 SolverSat, 17 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 379 GetRequests, 312 SyntacticMatches, 7 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 305 ImplicationChecksByTransitivity, 3.9s 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, 18 HoareAnnotationTreeSize, 3 FomulaSimplifications, 655 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 3 FomulaSimplificationsInter, 51 FormulaSimplificationTreeSizeReductionInter, 0.0s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.9s InterpolantComputationTime, 276 NumberOfCodeBlocks, 239 NumberOfCodeBlocksAsserted, 21 NumberOfCheckSat, 392 ConstructedInterpolants, 0 QuantifiedInterpolants, 34241 SizeOfPredicates, 8 NumberOfNonLiveVariables, 388 ConjunctsInSsa, 25 ConjunctsInUnsatCore, 17 InterpolantComputations, 3 PerfectInterpolantSequences, 2719/4450 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...