./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_1b.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_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/data/config -Xmx15G -Xms4m -jar /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/data -tc /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_1b.c -s /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/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 c1836be5ce35667bc02ed393f2cbc8396b48b5bb ...................................................................................................................................................................................................................................................................................................................................................................................................................... Execution finished normally Writing output log to file Ultimate.log Writing human readable error path to file UltimateCounterExample.errorpath Result: FALSE --- Real Ultimate output --- This is Ultimate 0.2.0-a4ecdab [2020-11-30 02:05:26,055 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-30 02:05:26,077 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-30 02:05:26,134 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-30 02:05:26,135 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-30 02:05:26,137 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-30 02:05:26,139 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-30 02:05:26,142 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-30 02:05:26,144 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-30 02:05:26,146 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-30 02:05:26,147 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-30 02:05:26,149 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-30 02:05:26,150 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-30 02:05:26,152 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-30 02:05:26,153 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-30 02:05:26,155 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-30 02:05:26,156 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-30 02:05:26,157 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-30 02:05:26,160 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-30 02:05:26,162 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-30 02:05:26,165 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-30 02:05:26,167 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-30 02:05:26,169 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-30 02:05:26,171 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-30 02:05:26,176 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-11-30 02:05:26,177 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-11-30 02:05:26,178 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-11-30 02:05:26,180 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-11-30 02:05:26,181 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-11-30 02:05:26,183 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-11-30 02:05:26,184 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-11-30 02:05:26,186 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-11-30 02:05:26,188 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-11-30 02:05:26,189 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-11-30 02:05:26,191 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-11-30 02:05:26,191 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-11-30 02:05:26,193 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-11-30 02:05:26,193 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-11-30 02:05:26,193 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-30 02:05:26,195 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-30 02:05:26,196 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-30 02:05:26,198 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/config/svcomp-Reach-32bit-Taipan_Default.epf [2020-11-30 02:05:26,229 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-30 02:05:26,229 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-30 02:05:26,230 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2020-11-30 02:05:26,231 INFO L138 SettingsManager]: * User list type=DISABLED [2020-11-30 02:05:26,231 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2020-11-30 02:05:26,231 INFO L138 SettingsManager]: * Explicit value domain=true [2020-11-30 02:05:26,232 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2020-11-30 02:05:26,232 INFO L138 SettingsManager]: * Octagon Domain=false [2020-11-30 02:05:26,232 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2020-11-30 02:05:26,232 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2020-11-30 02:05:26,233 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2020-11-30 02:05:26,233 INFO L138 SettingsManager]: * Interval Domain=false [2020-11-30 02:05:26,233 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2020-11-30 02:05:26,234 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2020-11-30 02:05:26,234 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2020-11-30 02:05:26,235 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-30 02:05:26,235 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-30 02:05:26,236 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-30 02:05:26,236 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-30 02:05:26,236 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-30 02:05:26,236 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-30 02:05:26,237 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-30 02:05:26,237 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-30 02:05:26,237 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2020-11-30 02:05:26,238 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-30 02:05:26,238 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-30 02:05:26,238 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-30 02:05:26,238 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-30 02:05:26,239 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-30 02:05:26,239 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-30 02:05:26,239 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-30 02:05:26,240 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:05:26,240 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-30 02:05:26,240 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-11-30 02:05:26,241 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-11-30 02:05:26,241 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2020-11-30 02:05:26,241 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-11-30 02:05:26,241 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-30 02:05:26,242 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-11-30 02:05:26,242 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2020-11-30 02:05:26,242 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_4fdcd76d-a94d-4f74-b602-5a71babf06b8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> c1836be5ce35667bc02ed393f2cbc8396b48b5bb [2020-11-30 02:05:26,487 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-30 02:05:26,516 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-30 02:05:26,521 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-30 02:05:26,522 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-30 02:05:26,523 INFO L275 PluginConnector]: CDTParser initialized [2020-11-30 02:05:26,524 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/../../sv-benchmarks/c/loop-simple/nested_1b.c [2020-11-30 02:05:26,620 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/data/01f150c65/0e6b2a9882354ab29537cf6b90c8efc3/FLAG858912db1 [2020-11-30 02:05:27,185 INFO L306 CDTParser]: Found 1 translation units. [2020-11-30 02:05:27,186 INFO L160 CDTParser]: Scanning /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/sv-benchmarks/c/loop-simple/nested_1b.c [2020-11-30 02:05:27,194 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/data/01f150c65/0e6b2a9882354ab29537cf6b90c8efc3/FLAG858912db1 [2020-11-30 02:05:27,541 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/data/01f150c65/0e6b2a9882354ab29537cf6b90c8efc3 [2020-11-30 02:05:27,545 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-30 02:05:27,547 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2020-11-30 02:05:27,550 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-30 02:05:27,550 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-30 02:05:27,569 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-30 02:05:27,570 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,572 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4d1b57ae and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27, skipping insertion in model container [2020-11-30 02:05:27,573 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,582 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-30 02:05:27,599 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-30 02:05:27,778 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:05:27,793 INFO L203 MainTranslator]: Completed pre-run [2020-11-30 02:05:27,807 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-30 02:05:27,821 INFO L208 MainTranslator]: Completed translation [2020-11-30 02:05:27,821 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27 WrapperNode [2020-11-30 02:05:27,822 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-30 02:05:27,823 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2020-11-30 02:05:27,823 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2020-11-30 02:05:27,823 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2020-11-30 02:05:27,836 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,846 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,868 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2020-11-30 02:05:27,871 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-30 02:05:27,871 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-30 02:05:27,871 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-30 02:05:27,880 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,881 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,883 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,883 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,891 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,896 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,899 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... [2020-11-30 02:05:27,907 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-30 02:05:27,909 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-30 02:05:27,909 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-30 02:05:27,913 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-30 02:05:27,914 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (1/1) ... No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-30 02:05:28,024 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-30 02:05:28,024 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-30 02:05:28,025 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-30 02:05:28,025 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-30 02:05:28,358 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-30 02:05:28,358 INFO L298 CfgBuilder]: Removed 7 assume(true) statements. [2020-11-30 02:05:28,360 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:05:28 BoogieIcfgContainer [2020-11-30 02:05:28,361 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-30 02:05:28,362 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-30 02:05:28,362 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-30 02:05:28,366 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-30 02:05:28,367 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 30.11 02:05:27" (1/3) ... [2020-11-30 02:05:28,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@502550d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:05:28, skipping insertion in model container [2020-11-30 02:05:28,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 30.11 02:05:27" (2/3) ... [2020-11-30 02:05:28,368 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@502550d6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 30.11 02:05:28, skipping insertion in model container [2020-11-30 02:05:28,368 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:05:28" (3/3) ... [2020-11-30 02:05:28,370 INFO L111 eAbstractionObserver]: Analyzing ICFG nested_1b.c [2020-11-30 02:05:28,390 INFO L164 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2020-11-30 02:05:28,403 INFO L176 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-30 02:05:28,421 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-30 02:05:28,468 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-30 02:05:28,468 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-30 02:05:28,468 INFO L379 AbstractCegarLoop]: Compute interpolants for FPandBP [2020-11-30 02:05:28,468 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-30 02:05:28,468 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-30 02:05:28,468 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-30 02:05:28,469 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-30 02:05:28,469 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-30 02:05:28,513 INFO L276 IsEmpty]: Start isEmpty. Operand 7 states. [2020-11-30 02:05:28,518 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2020-11-30 02:05:28,518 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:05:28,519 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2020-11-30 02:05:28,519 INFO L429 AbstractCegarLoop]: === Iteration 1 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:05:28,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:05:28,526 INFO L82 PathProgramCache]: Analyzing trace with hash 1819750, now seen corresponding path program 1 times [2020-11-30 02:05:28,548 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:05:28,559 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1231062799] [2020-11-30 02:05:28,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:05:28,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:05:28,757 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:28,757 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1231062799] [2020-11-30 02:05:28,758 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-30 02:05:28,758 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-11-30 02:05:28,759 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [188270260] [2020-11-30 02:05:28,764 INFO L461 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-11-30 02:05:28,764 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:05:28,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-11-30 02:05:28,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:05:28,781 INFO L87 Difference]: Start difference. First operand 7 states. Second operand 3 states. [2020-11-30 02:05:28,815 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:05:28,816 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2020-11-30 02:05:28,816 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-11-30 02:05:28,817 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 4 [2020-11-30 02:05:28,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:05:28,826 INFO L225 Difference]: With dead ends: 13 [2020-11-30 02:05:28,826 INFO L226 Difference]: Without dead ends: 6 [2020-11-30 02:05:28,835 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-11-30 02:05:28,853 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2020-11-30 02:05:28,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2020-11-30 02:05:28,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 6 states. [2020-11-30 02:05:28,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2020-11-30 02:05:28,894 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2020-11-30 02:05:28,894 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:05:28,894 INFO L481 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2020-11-30 02:05:28,895 INFO L482 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-11-30 02:05:28,895 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2020-11-30 02:05:28,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2020-11-30 02:05:28,895 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:05:28,895 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2020-11-30 02:05:28,896 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-30 02:05:28,897 INFO L429 AbstractCegarLoop]: === Iteration 2 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:05:28,901 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:05:28,902 INFO L82 PathProgramCache]: Analyzing trace with hash 56337280, now seen corresponding path program 1 times [2020-11-30 02:05:28,902 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:05:28,903 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1926840386] [2020-11-30 02:05:28,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:05:28,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:05:28,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:28,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1926840386] [2020-11-30 02:05:28,988 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [848610547] [2020-11-30 02:05:28,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/z3 Starting monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:05:29,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:05:29,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 3 conjunts are in the unsatisfiable core [2020-11-30 02:05:29,078 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:05:29,149 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:29,149 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:05:29,193 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:29,193 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2076330549] [2020-11-30 02:05:29,218 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 02:05:29,218 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:05:29,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:05:29,228 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:05:29,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:05:29,849 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:05:29,968 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 23 [2020-11-30 02:05:30,209 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 23 [2020-11-30 02:05:30,212 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:05:30,213 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:05:30,213 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2020-11-30 02:05:30,214 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621656658] [2020-11-30 02:05:30,215 INFO L461 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-11-30 02:05:30,215 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:05:30,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-11-30 02:05:30,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-11-30 02:05:30,217 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand 7 states. [2020-11-30 02:05:30,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:05:30,246 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2020-11-30 02:05:30,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-11-30 02:05:30,247 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 5 [2020-11-30 02:05:30,247 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:05:30,247 INFO L225 Difference]: With dead ends: 12 [2020-11-30 02:05:30,248 INFO L226 Difference]: Without dead ends: 9 [2020-11-30 02:05:30,249 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2020-11-30 02:05:30,249 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2020-11-30 02:05:30,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2020-11-30 02:05:30,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 9 states. [2020-11-30 02:05:30,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2020-11-30 02:05:30,252 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2020-11-30 02:05:30,253 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:05:30,253 INFO L481 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2020-11-30 02:05:30,253 INFO L482 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-11-30 02:05:30,253 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2020-11-30 02:05:30,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2020-11-30 02:05:30,254 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:05:30,254 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2020-11-30 02:05:30,454 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2020-11-30 02:05:30,455 INFO L429 AbstractCegarLoop]: === Iteration 3 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:05:30,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:05:30,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1062749466, now seen corresponding path program 2 times [2020-11-30 02:05:30,456 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:05:30,456 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1984695998] [2020-11-30 02:05:30,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:05:30,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-30 02:05:30,555 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:30,555 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1984695998] [2020-11-30 02:05:30,556 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [707612892] [2020-11-30 02:05:30,556 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 No working directory specified, using /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/z3 Starting monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 -smt2 -in SMTLIB2_COMPLIANT=true [2020-11-30 02:05:30,610 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2020-11-30 02:05:30,611 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-11-30 02:05:30,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 49 conjuncts, 6 conjunts are in the unsatisfiable core [2020-11-30 02:05:30,616 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-11-30 02:05:30,651 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:30,652 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-11-30 02:05:30,700 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-30 02:05:30,701 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1289617289] [2020-11-30 02:05:30,704 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2020-11-30 02:05:30,705 INFO L166 IcfgInterpreter]: Building call graph [2020-11-30 02:05:30,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2020-11-30 02:05:30,706 INFO L176 IcfgInterpreter]: Starting interpretation [2020-11-30 02:05:30,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2020-11-30 02:05:31,021 INFO L180 IcfgInterpreter]: Interpretation finished [2020-11-30 02:05:31,157 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 23 [2020-11-30 02:05:31,384 WARN L332 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: Unknown [2020-11-30 02:05:31,384 INFO L219 FreeRefinementEngine]: Constructing automaton from 0 perfect and 3 imperfect interpolant sequences. [2020-11-30 02:05:31,384 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2020-11-30 02:05:31,384 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1386378443] [2020-11-30 02:05:31,385 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-30 02:05:31,385 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2020-11-30 02:05:31,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-30 02:05:31,386 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-11-30 02:05:31,386 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand 9 states. [2020-11-30 02:05:31,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-30 02:05:31,429 INFO L93 Difference]: Finished difference Result 14 states and 15 transitions. [2020-11-30 02:05:31,430 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-11-30 02:05:31,430 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 8 [2020-11-30 02:05:31,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-30 02:05:31,430 INFO L225 Difference]: With dead ends: 14 [2020-11-30 02:05:31,430 INFO L226 Difference]: Without dead ends: 11 [2020-11-30 02:05:31,431 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=45, Invalid=87, Unknown=0, NotChecked=0, Total=132 [2020-11-30 02:05:31,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2020-11-30 02:05:31,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2020-11-30 02:05:31,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 11 states. [2020-11-30 02:05:31,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 11 transitions. [2020-11-30 02:05:31,434 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 11 transitions. Word has length 8 [2020-11-30 02:05:31,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-30 02:05:31,435 INFO L481 AbstractCegarLoop]: Abstraction has 11 states and 11 transitions. [2020-11-30 02:05:31,435 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-30 02:05:31,435 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 11 transitions. [2020-11-30 02:05:31,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-11-30 02:05:31,435 INFO L414 BasicCegarLoop]: Found error trace [2020-11-30 02:05:31,435 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1] [2020-11-30 02:05:31,636 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2020-11-30 02:05:31,636 INFO L429 AbstractCegarLoop]: === Iteration 4 === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-30 02:05:31,637 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-30 02:05:31,637 INFO L82 PathProgramCache]: Analyzing trace with hash 897580582, now seen corresponding path program 3 times [2020-11-30 02:05:31,637 INFO L162 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2020-11-30 02:05:31,637 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214549960] [2020-11-30 02:05:31,637 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-30 02:05:31,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 02:05:31,654 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 02:05:31,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-30 02:05:31,672 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-30 02:05:31,690 INFO L173 FreeRefinementEngine]: Strategy SIFA_TAIPAN found a feasible trace [2020-11-30 02:05:31,690 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-30 02:05:31,691 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-11-30 02:05:31,722 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 30.11 02:05:31 BoogieIcfgContainer [2020-11-30 02:05:31,722 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-30 02:05:31,723 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2020-11-30 02:05:31,723 INFO L271 PluginConnector]: Initializing Witness Printer... [2020-11-30 02:05:31,723 INFO L275 PluginConnector]: Witness Printer initialized [2020-11-30 02:05:31,724 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 30.11 02:05:28" (3/4) ... [2020-11-30 02:05:31,727 INFO L131 WitnessPrinter]: Generating witness for reachability counterexample [2020-11-30 02:05:31,787 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud-vcloud-master/worker/run_dir_4fdcd76d-a94d-4f74-b602-5a71babf06b8/bin/utaipan/witness.graphml [2020-11-30 02:05:31,787 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2020-11-30 02:05:31,789 INFO L168 Benchmark]: Toolchain (without parser) took 4240.51 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 55.9 MB in the beginning and 66.9 MB in the end (delta: -11.0 MB). Peak memory consumption was 8.0 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,789 INFO L168 Benchmark]: CDTParser took 0.35 ms. Allocated memory is still 88.1 MB. Free memory was 47.5 MB in the beginning and 47.5 MB in the end (delta: 34.5 kB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:05:31,795 INFO L168 Benchmark]: CACSL2BoogieTranslator took 271.94 ms. Allocated memory is still 88.1 MB. Free memory was 55.7 MB in the beginning and 65.8 MB in the end (delta: -10.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,795 INFO L168 Benchmark]: Boogie Procedure Inliner took 44.89 ms. Allocated memory is still 88.1 MB. Free memory was 65.8 MB in the beginning and 64.5 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. [2020-11-30 02:05:31,796 INFO L168 Benchmark]: Boogie Preprocessor took 37.03 ms. Allocated memory is still 88.1 MB. Free memory was 64.5 MB in the beginning and 63.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,796 INFO L168 Benchmark]: RCFGBuilder took 451.58 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 51.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,797 INFO L168 Benchmark]: TraceAbstraction took 3359.84 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 50.9 MB in the beginning and 69.0 MB in the end (delta: -18.1 MB). Peak memory consumption was 2.6 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,798 INFO L168 Benchmark]: Witness Printer took 64.30 ms. Allocated memory is still 107.0 MB. Free memory was 69.0 MB in the beginning and 66.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. [2020-11-30 02:05:31,806 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.35 ms. Allocated memory is still 88.1 MB. Free memory was 47.5 MB in the beginning and 47.5 MB in the end (delta: 34.5 kB). There was no memory consumed. Max. memory is 16.1 GB. * CACSL2BoogieTranslator took 271.94 ms. Allocated memory is still 88.1 MB. Free memory was 55.7 MB in the beginning and 65.8 MB in the end (delta: -10.1 MB). Peak memory consumption was 8.4 MB. Max. memory is 16.1 GB. * Boogie Procedure Inliner took 44.89 ms. Allocated memory is still 88.1 MB. Free memory was 65.8 MB in the beginning and 64.5 MB in the end (delta: 1.3 MB). There was no memory consumed. Max. memory is 16.1 GB. * Boogie Preprocessor took 37.03 ms. Allocated memory is still 88.1 MB. Free memory was 64.5 MB in the beginning and 63.5 MB in the end (delta: 1.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * RCFGBuilder took 451.58 ms. Allocated memory is still 88.1 MB. Free memory was 63.5 MB in the beginning and 51.2 MB in the end (delta: 12.2 MB). Peak memory consumption was 12.6 MB. Max. memory is 16.1 GB. * TraceAbstraction took 3359.84 ms. Allocated memory was 88.1 MB in the beginning and 107.0 MB in the end (delta: 18.9 MB). Free memory was 50.9 MB in the beginning and 69.0 MB in the end (delta: -18.1 MB). Peak memory consumption was 2.6 MB. Max. memory is 16.1 GB. * Witness Printer took 64.30 ms. Allocated memory is still 107.0 MB. Free memory was 69.0 MB in the beginning and 66.9 MB in the end (delta: 2.1 MB). Peak memory consumption was 2.1 MB. Max. memory is 16.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 13]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L16] int a = 6; [L19] a = 0 [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND TRUE a < 6 [L19] ++a [L19] COND FALSE !(a < 6) [L22] COND TRUE a == 6 [L13] __assert_fail("0", "nested_1b.c", 13, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 7 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 3.2s, OverallIterations: 4, TraceHistogramMax: 6, AutomataDifference: 0.1s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 14 SDtfs, 0 SDslu, 9 SDs, 0 SdLazy, 32 SolverSat, 5 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.0s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 46 GetRequests, 26 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.9s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=11occurred in iteration=3, 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, 3 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 40 NumberOfCodeBlocks, 40 NumberOfCodeBlocksAsserted, 8 NumberOfCheckSat, 36 ConstructedInterpolants, 0 QuantifiedInterpolants, 468 SizeOfPredicates, 2 NumberOfNonLiveVariables, 89 ConjunctsInSsa, 9 ConjunctsInUnsatCore, 7 InterpolantComputations, 1 PerfectInterpolantSequences, 0/33 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 incorrect! Received shutdown request...